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WO2018166882A1 - Plaque d'électrode positive ensachée, ensemble d'électrodes en couches, dispositif de stockage d'énergie, et procédé de fabrication de plaque d'électrode positive ensachée - Google Patents

Plaque d'électrode positive ensachée, ensemble d'électrodes en couches, dispositif de stockage d'énergie, et procédé de fabrication de plaque d'électrode positive ensachée Download PDF

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Publication number
WO2018166882A1
WO2018166882A1 PCT/EP2018/055738 EP2018055738W WO2018166882A1 WO 2018166882 A1 WO2018166882 A1 WO 2018166882A1 EP 2018055738 W EP2018055738 W EP 2018055738W WO 2018166882 A1 WO2018166882 A1 WO 2018166882A1
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WO
WIPO (PCT)
Prior art keywords
positive electrode
electrode plate
bag
separators
packed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2018/055738
Other languages
English (en)
Inventor
Kazuya Okabe
Yusuke Oki
Yasuaki YAMAMURA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lithium Energy and Power GmbH and Co KG
Original Assignee
Lithium Energy and Power GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lithium Energy and Power GmbH and Co KG filed Critical Lithium Energy and Power GmbH and Co KG
Publication of WO2018166882A1 publication Critical patent/WO2018166882A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
    • H01M50/461—Separators, membranes or diaphragms characterised by their combination with electrodes with adhesive layers between electrodes and separators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a bag-packed positive electrode plate, a layered electrode assembly, an energy storage device, and a manufacturing method of a bag-packed positive electrode plate.
  • a chargeable and dischargeable energy storage device has been used in various equipment such as a mobile phone or an electric vehicle.
  • the energy storage device includes a layered electrode assembly which is formed by alternately stacking a positive electrode plate having a surface on which a positive active material layer is formed and a negative electrode plate having a surface on which a negative active material layer is formed with a separator having electric insulation property sandwiched between the positive electrode plate and the negative electrode plate.
  • a separator having electric insulation property sandwiched between the positive electrode plate and the negative electrode plate.
  • metal precipitation lithium dendrite, for example
  • a separator thus causing minute short-circuiting between a positive electrode plate and a negative electrode plate.
  • a layered electrode assembly which can suppress mixing of metal species which generate metal ions capable of forming a precipitation on an electrolyte in the vicinity of the positive electrode plate and can suppress
  • electrodeposition caused by contacting of metal ions with a negative electrode using a bag-packed electrode plate which is formed into a bag shape by welding outer peripheries of a pair of separators which sandwiches the positive electrode plate or the negative electrode plate therebetween to each other.
  • a welded portion of the separators does not contribute to charging and discharging and hence, when a space in the inside of an energy storage device is occupied only by the welded portion of the separators, there may be a possibility that such a configuration obstructs the increase of energy density of the energy storage device.
  • the positive electrode plate projects from the negative electrode plate as viewed in a plan view, an electric current is concentrated on an end portion of the negative electrode plate so that electrodeposition is locally accelerated and hence, it is preferable that the positive electrode plate be disposed so as not to project from the negative electrode plate as viewed in a plan view. Accordingly, by using a layered electrode assembly formed by stacking a bag-packed positive electrode plate and a negative electrode plate which is not bag-packed, the space efficiency can be enhanced thus increasing energy density of the energy storage device.
  • the separator formed of a resin film is relatively weak to heat.
  • organic layer is formed on a surface of a separator which is brought into contact with a plate thus enhancing heat resistance of the separator (see JP- A-2013-143337).
  • a layered electrode assembly is formed by alternately stacking a bag-packed positive electrode plate where a positive electrode plate is sandwiched between a pair of separators and the pair of separators is adhered to each other outside the positive electrode plate as viewed in a plan view, and a negative electrode plate which has a size larger than the positive electrode plate and smaller than the separators and is not bag- packed, and the layered electrode assembly is accommodated in the inside of an outer case.
  • Patent Document l JP-A-2013- 143337
  • the bag-packed positive electrode plate described in the above- mentioned JP-A-2013- 143337 uses separators each having a heat resistant layer on a surface thereof which is brought into contact with an electrode plate. Accordingly, the pair of separators are joined to each other outside the positive electrode plate as viewed in a plan view by breaking the heat resistant layers and by welding resin films to each other using a jig
  • a bag-packed positive electrode plate includes : a positive electrode plate! and a pair of separators which sandwiches the positive electrode plate therebetween, wherein each of the separators has a resin layer, a heat resistant layer which is stacked on the resin layer, and an adhesive layer which is stacked on a surface of the heat resistant layer which opposedly faces the positive electrode plate, and the adhesive layers of the pair of separators are adhered to the positive electrode plate and are adhered to each other outside the positive electrode plate as viewed in a plan view.
  • a manufacturing method of a bag-packed positive electrode plate includes : sandwiching a positive electrode plate by a pair of separators each having a resin layer, a heat resistant layer stacked on the resin layer, and an adhesive layer stacked on a surface of the heat resistant layer opposedly facing the positive electrode plate, the pair of separators enveloping the positive electrode plate as viewed in a plan view! and sandwiching a layered product of the positive electrode plate and the pair of separators using a heating mold heated at a temperature lower than a melting point of the resin layer thus adhering the adhesive layers to the positive electrode plate and making the adhesive layers which opposedly face each other outside the positive electrode plate as viewed in a plan view adhere to each other.
  • a manufacturing method of a bag-packed positive electrode plate according to still another aspect of the present invention includes :
  • a positive electrode plate sandwiching a positive electrode plate by a pair of separators each having a resin layer, a heat resistant layer stacked on the resin layer, and an adhesive layer stacked on a surface of the heat resistant layer opposedly facing the positive electrode plate, the pair of separators enveloping the positive electrode plate as viewed in a plan view! and sandwiching a layered product of the positive electrode plate and the pair of separators by a pair of molds in which at least one of the mold is ultrasonically vibrated thus adhering the adhesive layers to the positive electrode plate and making the adhesive layers which opposedly face each other outside the positive electrode plate as viewed in a plan view adhere to each other.
  • the adhesive layers of the pair of separators are adhered to the positive electrode plate and, at the same time, the adhesive layers of the pair of separators are adhered to each other outside the positive electrode plate as viewed in a plan view and hence, it is possible to prevent mixing of foreign substances between the positive electrode plate and the separator.
  • Fig. 1 is a schematic exploded perspective view showing a
  • Fig. 2 is a schematic cross- sectional view of a bag-packed positive electrode plate of the energy storage device shown in Fig. 1.
  • Fig. 3 is a schematic plan view of the bag-packed positive electrode plate shown in Fig. 2.
  • a bag-packed positive electrode plate includes : a positive electrode plate! and a pair of separators which sandwiches the positive electrode plate therebetween, wherein each of the separators has a resin layer, a heat resistant layer which is stacked on the resin layer, and an adhesive layer which is stacked on a surface of the heat resistant layer which opposedly faces the positive electrode plate, and the adhesive layers of the pair of separators are adhered to the positive electrode plate and are adhered to each other outside the positive electrode plate as viewed in a plan view.
  • the adhesive layers of the pair of separators are adhered to the positive electrode plate and hence, it is possible to prevent mixing of foreign substances between the positive electrode plate and the separators. Further, the adhesive layers are adhered to each other outside the positive electrode plate as viewed in a plan view and hence, it is possible to prevent mixing of foreign substances into an end surface side of the positive electrode plate, and it is also possible to prevent peeling of the separator from the positive electrode plate.
  • the adhesive layer be not partially adhered to the positive electrode plate and the other adhesive layer which the adhesive layer opposedly faces.
  • the adhesive layer be formed of a mixed material which contains : particles including an electrolyte solution and exhibiting ion conductivity! and a binder.
  • ion conductivity of the adhesive layer can be relatively increased and hence, an output of the energy storage device can be increased.
  • the layered electrode assembly includes a plurality of the bag-packed positive electrode plates and a plurality of negative electrode plates, wherein the bag-packed positive electrode and the negative electrode plates are alternately stacked with each other.
  • the layered electrode assembly includes the bag-packed positive electrode plate which can prevent mixing of foreign substances between the positive electrode plate and the separator and hence, the electrodeposition can be suppressed.
  • the energy storage device includes : the above-mentioned layered electrode assembly! and an outer case which accommodates the layered electrode assembly therein.
  • the energy storage device includes the above-mentioned layered electrode assembly which can suppress the electrodeposition and hence, the energy storage device has high reliability. Further, when a temperature in the energy storage device is increased so that the separator is exposed to a high temperature in a peculiar situation which is not predictable in a normal in- use state, it is possible to prevent the occurrence of a phenomenon that the separator shrinks so that the positive electrode plate is exposed from the separator.
  • a manufacturing method of a bag-packed positive electrode plate includes : sandwiching a positive electrode plate by a pair of separators each having a resin layer, a heat resistant layer stacked on the resin layer, and an adhesive layer stacked on a surface of the heat resistant layer opposedly facing the positive electrode plate, the pair of separators enveloping the positive electrode plate as viewed in a plan view! and sandwiching a layered product of the positive electrode plate and the pair of separators using a heating mold heated at a temperature lower than a melting point of the resin layer thus adhering the adhesive layers to the positive electrode plate and making the adhesive layers which opposedly face each other outside the positive electrode plate as viewed in a plan view adhere to each other.
  • the pair of separators each having the resin layer, the heat resistant layer, and the adhesive layer are sandwiched by a heating mold which is heated at a temperature lower than a melting point of the resin layer so that the adhesive layers are adhered to the positive electrode plate and, at the same time, the opposedly facing adhesive layers are adhered to each other outside the positive electrode plate as viewed in a plan. Accordingly, it is possible to obtain a bag-packed positive electrode plate which can effectively prevent mixing of foreign substances between the positive electrode plate and the separators.
  • a manufacturing method of a bag-packed positive electrode plate includes : sandwiching a positive electrode plate by a pair of separators each having a resin layer, a heat resistant layer stacked on the resin layer, and an adhesive layer stacked on a surface of the heat resistant layer opposedly facing the positive electrode plate, the pair of separators enveloping the positive electrode plate as viewed in a plan view! and sandwiching a layered product of the positive electrode plate and the pair of separators by a pair of heating molds in which at least one of the heating mold is ultrasonically vibrated thus adhering the adhesive layers to the positive electrode plate and making the adhesive layers which opposedly face each other outside the positive electrode plate as viewed in a plan view adhere to each other.
  • the adhesive layer of the separator can be adhered to the positive electrode plate and the adhesive layer of the opposedly facing separator in a relatively short time. Accordingly, manufacturing efficiency can be enhanced thus realizing the reduction of a manufacturing cost of the bag-packed positive electrode plate.
  • Fig. 1 shows an energy storage device according to one embodiment of the present invention.
  • the energy storage device includes a layered electrode assembly 1, and an outer case 2 which accommodates the layered electrode assembly 1 therein.
  • An electrolyte (an electrolyte solution) is filled in the outer case 2.
  • the energy storage device further includes a positive electrode terminal 3 and a negative electrode terminal 4 which project from the outer case 2, are exposed to an outer surface of the outer case 2, and are electrically connected to the layered electrode assembly 1 in the inside of the outer case 2.
  • the layered electrode assembly 1 includes a plurality of bag-packed positive electrode plates 5 and a plurality of negative electrode plates 6, wherein the bag-packed positive electrode plate 5 and the negative electrode plate 6 are alternately stacked with each other.
  • each bag-packed positive electrode plate 5 includes a positive electrode plate 7, and a pair of separators 8 which sandwiches the positive electrode plate 7 therebetween.
  • the pair of separators 8 may be two sheets opposedly facing each other, or may be formed by folding one sheet in two.
  • a width of the bag-packed positive electrode plate 5 be set equal to or below a width of the negative electrode plate 6.
  • a width of the separator 8 having an approximately rectangular planar shape is set equal to or below a width of the negative electrode plate 6 having an
  • a lower limit of the difference between a width of the bag-packed positive electrode plate 5 and a width of the negative electrode plate 6 is preferably set to 0 mm, and an upper limit of the difference between the width of the bag- packed positive electrode plate 5 and the width of the negative electrode plate 6 is preferably set to 1 mm, and more preferably set to 0.5 mm.
  • the difference between the width of the bag-packed positive electrode plate 5 and the width of the negative electrode plate 6 is set to the above-mentioned upper limit or below, it is possible to prevent the difference in area between the positive electrode plate 7 and the negative electrode plate 6 from increasing unnecessarily thus increasing energy density of the layered electrode assembly 1 and energy density of the energy storage device.
  • the positive electrode plate 7 can be relatively easily positioned with respect to the negative electrode plate 6. Accordingly, in the layered electrode assembly 1, even when a ratio of an area of the positive electrode plate 7 with respect to an area of the negative electrode plate 6 is relatively increased, electrodeposition on the outer edge portion of the negative electrode plate 6 is not accelerated and hence, energy density can be relatively increased.
  • the positive electrode plate 7 includes ⁇ a foil-like or sheet-like positive electrode current collector 9 having conductivity! and a positive active material layer 10 which is stacked on a surface of the positive electrode current collector 9.
  • the positive electrode plate 7 includes ⁇ an active material region having a rectangular shape as viewed in a plan view where the positive active material layer 10 is stacked on a surface of the positive electrode current collector 9! and a positive electrode tab 11 which extends from the active material region in a strip shape having a width smaller than a width of the active material region and is connected to the positive electrode terminal 3.
  • a metal material such as aluminum, copper, iron or nickel, or an alloy of such metal materials is used.
  • aluminum, an aluminum alloy, copper, and a copper alloy are preferably used, and aluminum and an aluminum alloy are more preferably used.
  • the shape of the positive electrode current collector 9, a foil, a vapor deposition film and the like can be named.
  • the positive electrode current collector 9 is preferably formed of a foil. That is, the positive current collector preferably made of an aluminum foil.
  • A1085P, A3003P prescribed in JIS-H4000 (2014) or the like can be exemplified.
  • a lower limit of an average thickness of the positive electrode current collector 9 is preferably set to 5 ⁇ , and more preferably set to 10 ⁇ .
  • an upper limit of the average thickness of the positive electrode current collector 9 is preferably set to 50 ⁇ , and more preferably set to 40 ⁇ .
  • the positive active material layer 10 is made of a so-called positive electrode mixture containing a positive active material.
  • the positive electrode mixture which forms the positive active material layer 10 contains arbitrary components such as a conductive agent, a binder, a thickening agent, a filler and the like when necessary.
  • a composite oxide expressed by Li x MO y (M indicating at least one kind of transition metal) (Li x Co0 2 , Li x Ni0 2 , Li x Mn 2 0 4 , Li x Mn0 3 , LixNi a Co(i-a)0 2 , Li x Ni a Mn p Co(i- a - P )0 2 , Li x Ni a Mn( 2 - a )O 4 or the like), or a polyanion compound expressed by Li x MO y (M indicating at least one kind of transition metal) (Li x Co0 2 , Li x Ni0 2 , Li x Mn 2 0 4 , Li x Mn0 3 , LixNi a Co(i-a)0 2 , Li x Ni a Mn p Co(i- a - P )0 2 , Li x Ni a Mn( 2 - a )O 4 or the like), or
  • LiwMe x (XOy) z (Me indicating at least one kind of transition metal, X being P, Si, B, V or the like, for example)
  • LiFeP0 4 , LiMnP0 4 , LiNiP0 4 , LiCoP0 4 , Li3V 2 (P0 4 )3, Li 2 MnSi0 4 , Li 2 CoP0 4 F or the like can be named.
  • An element or a polyanion in these compounds may be partially replaced with other element or other anion species.
  • one kind of these compounds may be used singly or may be used in a state where two or more kinds of compounds are mixed into a compound.
  • the crystal structure of the positive active material be a layered structure or a spinel structure.
  • a lower limit of a content of the positive active material in the positive active material layer 10 is preferably set to 50 mass%, and more preferably set to 70 mass%, and still further preferably set to 80 mass%.
  • an upper limit of the content of the positive active material in the positive active material layer 10 is preferably set to 99 mass%, and more preferably set to 94 mass%.
  • the conductive agent is not particularly limited provided that the conductive agent is made of a conductive material which does not adversely affect battery performance.
  • a conductive agent natural or artificial graphite, carbon black such as furnace black, acetylene black and Ketjen black, metal, conductive ceramics and the like can be named.
  • a shape of the conductive agent a powdery form, a fibrous form and the like can be named.
  • a lower limit of a content of the conductive agent in the positive active material layer 10 is preferably set to 0.1 mass%, and more preferably set to 0.5 mass%.
  • an upper limit of the content of the conductive agent is preferably set to 10mass%, and more preferably set to 5 mass%.
  • a fluororesin As a material of the binder, for example, a fluororesin
  • thermoplastic resin such as polyethylene, polypropylene and polyimide, elastomer such as ethylene-propylene-diene rubber (EPDM), sulfonated EPDM, styrene-butadiene rubber (SBR), fluororubber and the like, for example, polysaccharide polymer and the like can be named.
  • EPDM ethylene-propylene-diene rubber
  • SBR styrene-butadiene rubber
  • fluororubber for example, polysaccharide polymer and the like can be named.
  • a lower limit of a content of the binder in the positive active material layer 10 is preferably set to 1 mass%, and more preferably set to 2 mass%.
  • an upper limit of the content of the binder is preferably set to 10 mass%, and more preferably set to 5 mass%.
  • polysaccharide polymer such as carboxymethyl cellulose (CMC), methyl cellulose and the like can be named.
  • CMC carboxymethyl cellulose
  • the thickening agent has a functional group reactable with lithium, it is preferable to preliminarily deactivate the functional group by methylation or the like.
  • a material of the filler is not particularly limited provided that the battery performance is not adversely affected by the material.
  • a polyolefin such as polypropylene and polyethylene, silica, alumina, zeolite, glass, carbon and the like can be named.
  • a lower limit of an average thickness of the positive active material layer 10 is preferably set to 10 ⁇ , and more preferably set to 20 ⁇ .
  • an upper limit of the average thickness of the positive active material layer 10 is preferably set to 100 ⁇ , and more preferably set to 80 ⁇ .
  • the separator 8 includes a sheet-like resin layer 12, a heat resistant layer 13 which is stacked on a surface of the resin layer 12 which opposedly faces the positive electrode plate 7, and an adhesive layer 14 which is stacked on a surface of the heat resistant layer 13 which opposedly faces the positive electrode plate 7.
  • the adhesive layers 14 of the pair of separators 8 are respectively adhered to the positive electrode plate 7, and are adhered to each other outside the positive electrode plate 7 as viewed in a plan view (the adhered portion being indicated by hatching in Fig. 3).
  • the adhesive layer 14 may be adhered to the whole surface of the positive active material layer 10 of the positive electrode plate 7 and the whole projecting region of an adhesive layer of the opposedly facing separator 8 projecting from the positive electrode plate 7. However, it is preferable that the adhesive layer 14 be not partially adhered to the positive electrode plate 7 and the adhesive layer 14 of the opposedly facing separator 8. That is, it is preferable that the adhesive layer 14 be partially adhered to the positive electrode plate 7 and the adhesive layer 14 of the opposedly facing separator 8. [0049]
  • the adhesive layer 14 of the separator 8 is adhered to the positive electrode plate 7 and hence, it is possible to prevent foreign substances from being mixed between the positive electrode plate 7 and the separator 8.
  • the adhesive layers 14 of the pair of separators 8 which sandwich the positive electrode plate 7 therebetween are adhered to each other outside the positive electrode plate 7 as viewed in a plan view and hence, it is possible to prevent foreign substances from being mixed to an end surface side of the positive electrode plate 7. Further, peeling of the separators 8 from the positive electrode plate 7 can be prevented and hence, it is possible to prevent mixing of foreign substances between the positive electrode plate
  • the energy storage device can prevent internal short circuiting caused by electrodeposition.
  • the adhesive layer 14 of the separator 8 is not partially adhered to the positive electrode plate 7 and the adhesive layer 14 of the opposedly facing separator 8. With such a configuration, it is possible to supply electrolyte solution to inner surfaces of the separators through non-adhered portions between the positive electrode plate 7 and the separators 8 and hence, it is possible to easily pour an electrolyte solution into the separators
  • portions where the adhesive layer 14 of the separator 8 is not adhered to the positive electrode plate 7 and the adhesive layer 14 of the opposedly facing separator 8 be continuously formed.
  • adhered portions of the adhesive layer 14 of the separator 8 adhering to the positive electrode plate 7 and the adhesive layer 14 of the opposedly facing separator 8 be formed into a pattern such as a dotted pattern or a linear pattern where a plurality of adhered portions do not overlap with each other.
  • a lower limit of an average distance between the adhered portions of the adhesive layer 14 to the separator 8 is preferably set to 1 mm, and more preferably set to 2 mm.
  • an upper limit of the average distance between adhered portions of the adhesive layer 14 to the separator 8 is preferably set to 5 mm, and more preferably set to 4 mm.
  • the resin layer 12 is formed of a porous resin film.
  • the resin layer 12 As a main component of the resin layer 12, for example,
  • polyethylene PE
  • polypropylene PP
  • ethylene-vinyl acetate copolymer ethylene-methylacrylate copolymer
  • ethylene-ethyl acrylate copolymer ethylene-ethyl acrylate copolymer
  • a polyolefin derivative such as chlorinated polyethylene
  • polyolefin such as ethylene-propylene copolymer
  • polyester such as polyethylene- telephthalate and copolyester
  • main component means a component having a largest mass content.
  • a lower limit of an average thickness of the resin layer 12 is preferably set to 5 ⁇ , and more preferably set to 10 ⁇ .
  • an upper limit of the average thickness of the resin layer 12 is preferably set to 30 ⁇ , and more preferably set to 20 ⁇ .
  • the heat resistant layer 13 contains a large number of inorganic particles, and a binder for connecting the inorganic particles.
  • alumina, silica, zirconia, titania, magnesia, ceria, yttria, an oxide such as a zinc oxide and an iron oxide, a nitride such as a silicon nitride, a titanium nitride and a boron nitride, silicon carbide, calcium carbonate, aluminum sulfate, aluminum hydroxide, potassium titanate, talc, kaolin clay, kaolinite, halloysite, pyrophyllite, montmoriUonite, sericite, mica, amesite, bentonite, asbestos, zeolite, calcium silicate, magnesium silicate or the like can be named.
  • alumina, silica and titania are particularly preferable.
  • a lower limit of an average particle size of the inorganic particles contained in the heat resistant layer 13 is preferably set to 1 nm, and more preferably set to 7 nm.
  • an upper limit of the average particle size of the inorganic particles is preferably set to 5 ⁇ , and more preferably set to 1 ⁇ .
  • a fluororesin such as polyvinylidene fluoride
  • fluororubber such as vinylidene fluoride- hexafluoropropylene-tetrafluoroethylene copolymer, styrene-butadiene copolymer, and hydride of styrene-butadiene copolymer, acrylonitrile- butadiene copolymer and hydride of acrylonitrile-butadiene copolymer, acrylonitrile-butadiene-styrene copolymer and hydride of acrylonitrile- butadiene- styrene copolymer, synthetic rubber such as methacrylic ester- acrylic ester copolymer, styrene-acrylic ester copolymer, and acrylonitrile- acrylic ester copolymer, cellulose derivative such as carboxymethyl cellulose (CMC), hydroxyethyl cellulose (HEC), and ammonium salt of carboxymethyl cellulose, polyether
  • a lower limit of an average thickness of the heat resistant layer 13 is preferably set to 2 ⁇ , and more preferably set to 4 ⁇ .
  • an upper limit of the average thickness of the heat resistant layer 13 is preferably set to 10 ⁇ , and more preferably set to 6 ⁇ .
  • the adhesive layer 14 can be made of a mixed material containing particles exhibiting ion conductivity and a binder.
  • the adhesive layer 14 can be made of a material containing solid electrolyte particles which can possess ion conductivity by including an electrolyte solution, and a binder exhibiting adhesiveness due to heating, ultrasonic vibration or the like, for example. It is preferable that the adhesive layer 14 have continuous pores so as to allow a liquid and a gas to pass
  • a lower limit of an average thickness of the adhesive layer 14 is preferably set to 0.1 ⁇ , more preferably set to 0.2 ⁇ , and further more preferably set to 0.4 ⁇ .
  • an upper limit of the average thickness of the adhesive layer 14 is preferably set to 5 ⁇ , more preferably set to 3 ⁇ , and further more preferably set to 1.2 ⁇ .
  • an inorganic solid electrolyte, a pure solid polymer electrolyte, a gel polymer electrolyte and the like can be named.
  • the gel polymer electrolyte is a material which can facilitate handling thereof by turning an electrolyte solution into a gel state by polymer.
  • a polymer which terns an electrolyte solution into a gel state for example, vinylidene fluoride-hexafluoropropylene copolymer,
  • polymethylmethacrylic acid polyacrylonitrile and the like can be named.
  • an organic electrolyte solution formed by dissolving a support electrolyte in an organic solvent is used.
  • a lithium salt is preferably used.
  • a lithium salt is not particularly limited, for example, LiPF 6 , LiAsFe, LiBF 4 , LiSbF 6 , LiAlCl 4 , LiC10 4 , CF 3 S0 3 Li, C 4 F 9 S0 3 Li, CF 3 COOLi, (CF 3 CO) 2 NLi, (CF 3 S0 2 ) 2 NLi, (C 2 F 5 S0 2 )NLi and the like can be named.
  • LiPF6, LiC10 4 , CF3S0 3 Li which are easily dissolved in an organic solvent and exhibit a high dissociation degree are particularly preferably used.
  • An organic solvent used in an electrolyte solution is not particularly limited provided that the organic solvent can dissolve a support electrolyte.
  • carbonates such as a dimethyl carbonate (DMC), an ethylene carbonate (EC), a diethyl carbonate (DEC), a propylene carbonate (PC), a butylene carbonate (BC) and a methyl-ethyl carbonate (MEC), for example, esters such as ⁇ -butyrolactone and methyl formate, for example, ethers such as 1,2 -dimethoxy- ethane and tetrahydrofuran, sulfur- containing compounds such as sulfolane and dimethylsulfoxide and the like can be used singly or in combination of plural kinds of these materials.
  • carbonates having a high dielectric constant and having a wide stable potential region are particularly preferably used.
  • a lower limit of concentration of the support electrolyte in the electrolyte solution is preferably set to 1 mass%, and more preferably set to 5 mass%.
  • an upper limit of the concentration of the support electrolyte in the electrolyte solution is preferably set to 30 mass%, and more preferably set to 20 mass%.
  • a lower limit of an average particle size of the solid electrolyte particles is preferably set to 0.1 ⁇ , and more preferably set to 0.2 ⁇ .
  • an upper limit of the average particle size of the solid electrolyte particles is preferably set to 2 ⁇ , and more preferably set to 1 ⁇ .
  • a shape of the solid electrolyte particles a shape having small sphericity such as a rod shape, a conical shape, a plate shape is preferable so as to increase ion conductivity by accelerating contact between the solid electrolyte particles, for example.
  • the binder has adhesiveness to the solid electrolyte particles and the positive active material layer 10.
  • a resin capable of being adhered to the positive active material layer 10 by being heated at a relatively low temperature that is, a polymer material having a relatively low glass transition point and exhibiting adhesiveness is preferably used.
  • a lower limit of the glass transition point of the binder is preferably set to -50°C, and more preferably set to -45°C.
  • an upper limit of the glass transition point of the binder is preferably set to 50°C, and more preferably set to 45°C.
  • an acrylic polymer and the like can be named.
  • the acrylic polymer a nitrile -group - containing acrylic polymer which includes a monomer unit having a nitrile group and a (meth)acrylate acid ester monomer unit is preferably used.
  • the monomer unit having a nitrile group is a structural unit obtained by polymerizing acrylonitrile, methacrylonitrile or the like, for example, and a (meth)acrylate acid ester monomer unit is a monomer unit derived from a compound expressed by (in the formula, R 1 indicating a hydrogen atom or a methyl group, and R 2 indicating an alkyl group or a cycloalkyl group).
  • the nitrile group containing acrylic polymer may contain an ethylenic unsaturated acid monomer unit obtained by
  • nitrile group containing acrylic polymer may be formed in a cross-linking manner.
  • a lower limit of a ratio of the solid electrolyte particles in the adhesive layer 14 is preferably set to 70 mass%, and more preferably set to 80 mass%.
  • an upper limit of the ratio of the solid electrolyte particles in the adhesive layer 14 is preferably set to 95 mass%, and more preferably set to 90 mass%.
  • the bag-packed positive electrode plate 5 shown in Fig. 2 is not limited to a bag-packed positive electrode plate manufactured by the manufacturing method described hereinafter.
  • the bag-packed positive electrode plate 5 can be manufactured by a method including: sandwiching the positive electrode plate 7 by the pair of separators 8 each having the resin layer 12, the heat resistant layer 13, and the adhesive layer 14 (stacking step); and sandwiching a layered product of the positive electrode plate 7 and the pair of separators 8 by a heating mold which is heated to a temperature lower than a melting point of the resin layer 12 (pressing step).
  • the adhesive layers 14 of the separators 8 are respectively brought into contact with the positive electrode plate 7, and the positive electrode plate 7 and the pair of separators 8 are stacked to each other such that the separators 8 envelopes the active material region of the positive electrode plate 7 as viewed in a plan view.
  • a pair of heating molds is heated to a
  • the temperature can be set to approximately 100°C, for example.
  • a pressing pressure by the heating molds can be set to approximately lN/cm 2 , for example.
  • a pressing time by the heating molds can be set to approximately 3 seconds.
  • the heating molds make the adhesive layers 14 adhere to at least portions of the positive electrode plate 7 by pressure-joining as viewed in a plan view and, at the same time, the heating molds make the adhesive layers 14 which opposedly face each other outside the positive electrode plate 7 as viewed in a plan view adhere to each other at least partially by pressure joining.
  • the heating mold has a groove on a pressing surface thereof such that a portion where the adhesive layer 14 is not adhered to the positive electrode plate 7 is formed on the separator 8.
  • a lower limit of a depth of the groove formed on the heating mold is preferably set to 0.5 mm, and more preferably set to 0.8 mm.
  • an upper limit of the depth of the groove formed on the heating mold is preferably set to 3 mm, and more preferably set to 2 mm.
  • a pair of vibrating molds at least one of which is ultrasonically vibrated may be used in place of the heating molds.
  • the adhesive layer 14 can be adhered to the positive electrode plate 7 and the opposedly facing adhesive layer 14 in a relatively short time. Accordingly, a cycle time of the pressing step can be shortened thus realizing the reduction of a manufacturing cost of the bag-packed positive electrode plate 5.
  • the bag-packed positive electrode plate 5 manufactured as described above can effectively prevent intrusion of foreign substances between the positive electrode plate 7 and the separator 8 as described above.
  • the layered electrode assembly 1 is formed by stacking the bag-packed positive electrode plates 5 and the negative electrode plates 6 to each other and the layered electrode assembly 1 is incorporated in the energy storage device, it is possible to prevent the occurrence of internal short-circuiting caused by electrodeposition.
  • the negative electrode plates 6 are stacked in the layered electrode assembly 1 without being bag-packed unlike the positive electrode plates 7.
  • the negative electrode plate 6 includes ⁇ a foil-like or sheet-like negative electrode current collector having conductivity! and a negative active material layer which is stacked on a surface of the negative electrode current collector.
  • the negative electrode plate 6 includes ⁇ an active material region having a rectangular shape as viewed in a plan view where the active material layer 12 is stacked on a surface of the negative electrode current collector, and a negative electrode tab which extends from the active material region in a strip shape having a width smaller than a width of the active material region and is connected to the negative electrode terminal 4.
  • the negative electrode current collector can be formed substantially in the same manner as the above-mentioned positive electrode current collector 9, copper or a copper alloy is preferably used as a material for forming the negative electrode current collector. That is, a copper foil is preferably used as the negative electrode current collector of the negative electrode 6. As a copper foil, a rolled copper foil, an electrolytic copper foil and the like can be exemplified.
  • the negative active material layer is made of a so-called negative electrode plate mixture containing a negative active material.
  • the negative electrode plate mixture which forms the negative active material layer contains arbitrary components such as a conductive agent, a binder, a thickening agent, a filler and the like when necessary.
  • arbitrary components such as a conductive agent, a binder, a thickening agent, a filler and the like used for forming the negative active material layer, arbitrary components substantially equal to the arbitrary components used for forming the positive active material layer 10 can be used.
  • the negative active material a material which can occlude and discharge lithium ions is preferably used.
  • metal such as lithium or a lithium alloy, a metal oxide! a polyphosphoric acid compound, a carbon material such as graphite, non ⁇ crystalline carbon (easily graphitizable carbon or hardly graphitizable carbon) or the like can be named, for example.
  • Si, an Si oxide, Sn, an Sn oxide or a combination of these materials it is preferable to use Si, an Si oxide, Sn, an Sn oxide or a combination of these materials. It is particularly preferable to use an Si oxide.
  • Si and Sn can have a discharge capacity approximately three times as large as a discharge capacity of graphite when Si and Sn are used in the form of an oxide.
  • a ratio of the number of atoms of oxygen (O) contained in an Si oxide with respect to the number of atoms of Si is preferably set to more than 0 to less than 2. That is, as Si oxide, a compound expressed as SiO x (0 ⁇ x ⁇ 2) is preferably used. Further, the ratio of the number of atoms of 0 with respect to the number of atoms of Si is preferably set to a value which falls within a range of from 0.5 to 1.5 inclusive. [0088]
  • the above-mentioned materials can be used in a single form, or two or more kinds of the materials may be used by mixing.
  • an Si oxide and other negative active materials by mixing, both discharge capacities per unit opposedly facing area between the positive electrode plate 7 and the negative electrode plate 6 and a ratio of a mass of a positive active material with respect to a mass of a negative active material described later can be adjusted to suitable values.
  • carbon materials such as graphite, hard carbon, soft carbon, coke, acetylene black, Ketjen black, vapor phase growth carbon fibers, fullerene, and activated carbon can be named.
  • carbon materials only one kind of material may be mixed with an Si oxide, or two or more kinds of materials may be mixed with an Si oxide in an arbitrary combination or at an arbitrary ratio.
  • graphite having a relatively low charge- discharge potential is preferably used.
  • graphite used in a form that graphite is mixed with an Si oxide flaky graphite, spherical graphite, artificial graphite, natural graphite and the like can be named.
  • flaky graphite which can easily maintain its contact with Si oxide particle surfaces even when charging and discharging of the energy storage device are repeated is preferably used.
  • the negative active material layer may contain ⁇ a small amount of a typical nonmetallic element such as B, N, P, F, CI, Br, I; a typical metallic element such as Li, Na, Mg, Al, K, Ca, Zn, Ga, Ge! and a transition metallic element such as Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Mo, Zr, Ta, Hf, Nb, W in addition to an Si oxide.
  • a typical nonmetallic element such as B, N, P, F, CI, Br, I
  • a typical metallic element such as Li, Na, Mg, Al, K, Ca, Zn, Ga, Ge!
  • a transition metallic element such as Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Mo, Zr, Ta, Hf, Nb, W in addition to an Si oxide.
  • the above-mentioned Si oxide (a material expressed by a general formula SiO x ) include both an S1O2 phase and an Si phase.
  • Si oxide lithium is occluded in or discharged from Si in a matrix of S1O2 and hence, such an Si oxide exhibits a small change in volume and exhibits an excellent charge- discharge cycle characteristic.
  • An average particle size of the Si oxide is preferably set to a value which falls within a range of from 1 ⁇ to 15 ⁇ inclusive.
  • Si oxide various Si oxides can be used ranging from a high crystalline Si oxide to an amorphous Si oxide. Further, as the Si oxide, an Si oxide which is washed by an acid such as a hydrogen fluoride or a sulfuric acid, or an Si oxide which is reduced by hydrogen may be used.
  • an acid such as a hydrogen fluoride or a sulfuric acid
  • an Si oxide which is reduced by hydrogen may be used.
  • a lower limit of a content of an Si oxide in the negative active material is preferably set to 30 mass%, more preferably set to 50 mass%, and further more preferably set to 70 mass%.
  • an upper limit of the content of the Si oxide is usually set to 100 mass%, and is preferably set to 90 mass%.
  • a lower limit of a content of the negative active material in the negative active material layer is preferably set to 60 mass%, more
  • an upper limit of the content of the negative active material is preferably set to 99 mass%, and more preferably set to 98 mass%.
  • a lower limit of a content of a binder in the negative active material layer is preferably set to 1 mass%, and more preferably set to 5 mass%.
  • an upper limit of the content of the binder is preferably set to 20 mass%, and more preferably set to 15 mass%.
  • a lower limit of an average thickness of the active material layer is preferably set to 10 ⁇ , and more preferably set to 20 ⁇ .
  • an upper limit of the average thickness of the negative active material layer is preferably set to 100 ⁇ , and more preferably set to 80 ⁇ .
  • the outer case 2 is a hermetically-closed container which
  • the outer case 2 As a material for forming the outer case 2, provided that the material has sealability capable of sealing electrolyte and a strength capable of protecting the layered electrode assembly 1, a resin or the like may be used, for example. However, metal is preferably used. In other words, although the outer case 2 may be a bag-shaped body formed of laminated film and having flexibility or the like, for example, it is preferable to use a robust metal case capable of protecting the layered electrode assembly 1 with more certainty.
  • a known electrolyte usually used in the energy storage device can be used.
  • a cyclic carbonate such as an ethylene carbonate (EC), a propylene carbonate (PC) or a butylene carbonate (BC)
  • a chain carbonate such as a diethyl carbonate (DEC), a dimethyl carbonate (DMC) or an ethyl-methyl carbonate (EMC)
  • the bag-packed positive electrode plate, the layered electrode assembly, and the energy storage device according to the present invention are preferably applicable to a secondary battery, and are used particularly preferably as a power source of a vehicle such as an electric vehicle, a plug- in hybrid electric vehicle (PHEV).
  • a vehicle such as an electric vehicle, a plug- in hybrid electric vehicle (PHEV).
  • PHEV plug- in hybrid electric vehicle

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  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Cell Separators (AREA)
  • Secondary Cells (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)

Abstract

Un aspect de la présente invention concerne une plaque d'électrode positive ensachée qui comprend : une plaque d'électrode positive; et une paire de séparateurs qui prennent en sandwich la plaque d'électrode positive entre eux, le séparateur ayant une couche de résine, une couche résistante à la chaleur empilée sur la couche de résine, et une couche adhésive empilée sur une surface de la couche résistante à la chaleur qui fait face à la plaque d'électrode positive, et les couches adhésives de la paire de séparateurs sont collées à la plaque d'électrode positive et sont collées les unes aux autres à l'extérieur de la plaque d'électrode positive telle qu'observée dans une vue en plan.
PCT/EP2018/055738 2017-03-13 2018-03-08 Plaque d'électrode positive ensachée, ensemble d'électrodes en couches, dispositif de stockage d'énergie, et procédé de fabrication de plaque d'électrode positive ensachée Ceased WO2018166882A1 (fr)

Applications Claiming Priority (2)

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JP2017047243A JP2018152226A (ja) 2017-03-13 2017-03-13 袋詰正極板、積層電極体、蓄電素子及び袋詰正極板の製造方法
JP2017-047243 2017-03-13

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JP7171643B2 (ja) * 2020-04-01 2022-11-15 プライムアースＥｖエナジー株式会社 二次電池及び二次電池製造方法
CN116325335A (zh) * 2021-05-24 2023-06-23 株式会社Lg新能源 单元电芯及包括该单元电芯的电池电芯
KR20230110393A (ko) * 2022-01-14 2023-07-24 주식회사 엘지에너지솔루션 전극 조립체 및 이를 포함하는 이차 전지

Citations (2)

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Publication number Priority date Publication date Assignee Title
US20110244304A1 (en) * 2010-03-30 2011-10-06 Sanyo Electric Co., Ltd. Stack type battery
JP2013143337A (ja) 2012-01-12 2013-07-22 Nissan Motor Co Ltd 二次電池の製造方法、二次電池、溶着装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110244304A1 (en) * 2010-03-30 2011-10-06 Sanyo Electric Co., Ltd. Stack type battery
JP2013143337A (ja) 2012-01-12 2013-07-22 Nissan Motor Co Ltd 二次電池の製造方法、二次電池、溶着装置
EP2804247A1 (fr) * 2012-01-12 2014-11-19 Nissan Motor Co., Ltd. Procédé de fabrication de batterie secondaire, batterie secondaire et dispositif de dépôt

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