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WO2018043406A1 - Corps d'électrode stratifié et élément de stockage d'électricité - Google Patents

Corps d'électrode stratifié et élément de stockage d'électricité Download PDF

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Publication number
WO2018043406A1
WO2018043406A1 PCT/JP2017/030752 JP2017030752W WO2018043406A1 WO 2018043406 A1 WO2018043406 A1 WO 2018043406A1 JP 2017030752 W JP2017030752 W JP 2017030752W WO 2018043406 A1 WO2018043406 A1 WO 2018043406A1
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WO
WIPO (PCT)
Prior art keywords
electrode plate
positive electrode
negative electrode
active material
laminated
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/JP2017/030752
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English (en)
Japanese (ja)
Inventor
祐輔 沖
篤哉 石橋
稲益　徳雄
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
GS Yuasa International Ltd
Original Assignee
Lithium Energy and Power GmbH and Co KG
GS Yuasa International Ltd
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, GS Yuasa International Ltd filed Critical Lithium Energy and Power GmbH and Co KG
Priority to JP2018537256A priority Critical patent/JPWO2018043406A1/ja
Priority to CN201780052920.XA priority patent/CN110062975A/zh
Priority to DE112017004366.2T priority patent/DE112017004366T5/de
Publication of WO2018043406A1 publication Critical patent/WO2018043406A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • 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
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • 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 laminated electrode body and a storage element.
  • secondary batteries that can be charged and discharged are used in various devices such as mobile phones and electric vehicles.
  • a secondary battery having a smaller size and a higher energy density (electric capacity per volume) has been demanded.
  • a secondary battery is formed by alternately laminating a positive electrode plate having an active material layer formed on a surface and a negative electrode plate having an active material layer formed on a surface through an electrically insulating separator.
  • a positive electrode plate having an active material layer formed on a surface
  • a negative electrode plate having an active material layer formed on a surface
  • an electrically insulating separator In order to increase the energy density in such a secondary battery, it is effective to make the separator thinner. For this reason, the secondary battery which formed the separator with the resin film is put into practical use.
  • metal deposits for example, lithium dendrite
  • electrodeposition in the negative electrode may penetrate the separator and cause a short circuit between the positive electrode plate and the negative electrode plate.
  • metal deposits for example, lithium dendrite
  • the separator may penetrate the separator and cause a short circuit between the positive electrode plate and the negative electrode plate.
  • a structure that suppresses metal ions from coming into contact with the negative electrode and being electrodeposited may be employed.
  • a packaged positive electrode plate in which a positive electrode plate is sandwiched between two separators and an unpacked negative electrode plate that is larger than the positive electrode plate and smaller than the separator are alternately stacked.
  • the laminated electrode body is accommodated in an exterior material.
  • the positive electrode plate is disposed inside the outer edge of the negative electrode plate in a plan view, that is, in the projection region of the negative electrode plate. This is because when the positive electrode plate protrudes from the negative electrode plate, the current concentrates at the end of the negative electrode plate, and the deposit formed by locally promoting electrodeposition causes a short circuit between the positive electrode plate and the negative electrode plate. It is for preventing becoming easy to do.
  • an object of the present invention is to provide a stacked electrode body and a storage element in which the relative positions of the packed positive electrode plate and negative electrode plate are relatively accurate while being relatively easy to manufacture. To do.
  • a positive electrode plate having a rectangular active material laminated region in a plan view is disposed between two separators each having a resin layer and a heat-resistant layer formed on the resin layer.
  • the welded area of the separator of the packaged positive electrode plate is included in the projected area of the negative electrode plate.
  • the laminated electrode body according to one aspect of the present invention is relatively easy to manufacture, but the relative positions of the packed positive electrode plate and negative electrode plate are relatively accurate.
  • FIG. 2 is a schematic plan view of a laminated electrode body of the energy storage device in FIG. 1.
  • a positive electrode plate having a rectangular active material lamination region in a plan view is disposed between two separators each having a resin layer and a heat-resistant layer formed on the resin layer, and the two sheets A positive electrode plate and a negative electrode plate that is not packaged.
  • the positive electrode plate and the negative electrode plate are laminated, and the bag is viewed in plan view. It is a laminated electrode body in which the welding region of the separator of the packed positive electrode plate is included in the projection region of the negative electrode plate.
  • the laminated electrode body two separators of the packaged positive electrode plate are welded outside the active material laminated region of the positive electrode plate, and the welded region of the separator of the packaged positive electrode plate is a projection region of the negative electrode plate in a plan view. Therefore, the active material lamination region of the positive electrode plate inside the welding region is also included in the projection region of the negative electrode plate. That is, in the laminated electrode body, the active material laminated region of the positive electrode plate entirely faces the negative electrode without protruding from the negative electrode plate in plan view.
  • the welded area of the separator is more rigid than the laminated body of the separators in the non-welded area, by bringing a guide or the like into contact with the welded area, the active material laminated area of the positive electrode plate can be reduced. Accurate lamination is possible so as not to protrude from the negative electrode plate.
  • the laminated electrode body can accurately position the active material lamination region of the positive electrode plate with respect to the negative electrode plate, the ratio of the area of the positive electrode plate to the area of the negative electrode plate can be relatively increased. The energy density can be made relatively large.
  • the two separators may be linearly welded along the four sides of the active material lamination region of the positive electrode plate. As described above, the two separators are welded linearly along the four sides of the active material lamination region of the positive electrode plate, thereby more accurately positioning the positive electrode plate between the two separators. Therefore, the dimensional difference between the separator and the positive electrode plate can be reduced to further improve the energy density. In addition, since the welded region is formed along the four sides of the active material lamination region of the positive electrode plate, the rigidity of the entire packed positive electrode plate is increased, so that the positioning of the packed positive electrode plate and the negative electrode plate is further facilitated. .
  • the average width of the welding region is preferably 10 ⁇ m or more and 1000 ⁇ m or less. In this way, by setting the average width of the welding region within the above range, the positive plate can be more reliably held by the two separators.
  • the average distance between the welding region and the outer edge of the positive electrode plate is preferably 0.1 mm or more and 1.0 mm or less. As described above, by setting the average distance between the welding region and the outer edge of the positive electrode plate within the above range, the movement of the positive electrode plate in the two separators is suppressed, and the two separators are welded. Relatively easy.
  • Another aspect of the present invention is a power storage device including the multilayer electrode body and an exterior material that accommodates the multilayer electrode body.
  • the electrical storage element is relatively easy to manufacture, the energy density can be relatively increased by including the laminated electrode body in which the relative positions of the packed positive electrode plate and negative electrode plate are relatively accurate. it can.
  • the exterior material is a metal case.
  • stacked electrode body can be protected because the said exterior material is a metal case.
  • the power storage element of FIG. 1 includes a laminated electrode body 1 that is another embodiment of the present invention, and an exterior material 2 that accommodates the laminated electrode body.
  • the power storage element is filled with an electrolyte (electrolytic solution) in the exterior material 2.
  • the laminated electrode body 1 includes a plurality of packaged positive plates 3 and a plurality of negative plates 4. These packaged positive electrode plates 3 and negative electrode plates 4 are alternately stacked.
  • the packaged positive electrode plate 3 includes two separators 5 and a positive electrode plate 6 disposed between the two separators 5.
  • the two separators 5 may be a single sheet folded in half.
  • the dimensions of the packed positive electrode plate 3 are set to be equal to or smaller than the dimensions of the negative electrode plate 4.
  • the width of the separator 5 having a substantially square planar shape is set to be equal to or smaller than the width of the negative electrode plate 4 having a substantially rectangular planar shape.
  • the lower limit of the difference between the dimension (width) of the packaged positive electrode plate 3 and the dimension (width) of the negative electrode plate 4 is 0 mm, but the dimensions of the packaged positive electrode plate 3 and the dimensions of the negative electrode plate 4 are as follows. Is preferably 1 mm, and more preferably 0.5 mm.
  • the difference between the dimensions of the packaged positive electrode plate 3 and the negative electrode plate 4 equal to or less than the above upper limit, the difference in area between the positive electrode plate 6 and the negative electrode plate 4 does not become unnecessarily large.
  • the energy density of the electrode body 1 and thus the power storage element can be sufficiently increased.
  • the positive electrode plate 6 can be relatively easily positioned with respect to the negative electrode plate 4 by positioning the separator 5 of the packaged positive electrode plate 3 with respect to the negative electrode plate 4. For this reason, in the laminated electrode body 1, even if the ratio of the area of the positive electrode plate 6 to the area of the negative electrode plate 4 is relatively large, the electrodeposition is not promoted at the outer edge portion of the negative electrode plate 4. can do.
  • the separator 5 is disposed inside the negative electrode plate 4 in the width direction, the clearance between the negative electrode plate 4 and the exterior material 2 can be reduced. For this reason, the said electrical storage element can make the dead space in the exterior material 2 comparatively small, and can make energy density comparatively large.
  • the separator 5 has a sheet-like resin layer 7 and a heat-resistant layer 8 laminated on the resin layer 7. In each packaged positive electrode plate 3, the two separators 5 are arranged so that the heat-resistant layers 8 face each other.
  • the planar shape of the separator 5 is not limited as long as the positive electrode plate 6 can be covered, but is typically rectangular.
  • the resin layer 7 is formed from a porous resin film.
  • the main component of the resin layer 7 examples include polyethylene (PE), polypropylene (PP), ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, and chlorinated polyethylene.
  • Polyolefins such as polyolefin derivatives, ethylene-propylene copolymers, and polyesters such as polyethylene terephthalate and copolymerized polyesters can be used.
  • polyethylene and polypropylene excellent in electrolytic solution resistance, durability, and weldability are preferably used.
  • the “main component” means a component having the largest mass content.
  • the lower limit of the average thickness of the resin layer 7 is preferably 5 ⁇ m and more preferably 10 ⁇ m.
  • the upper limit of the average thickness of the resin layer 7 is preferably 50 ⁇ m and more preferably 30 ⁇ m.
  • the heat-resistant layer 8 includes a large number of inorganic particles and a binder that connects the inorganic particles.
  • oxides such as alumina, silica, zirconia, titania, magnesia, ceria, yttria, zinc oxide, iron oxide, nitrides such as silicon nitride, titanium nitride, boron nitride, silicon carbide, carbonate Calcium, aluminum sulfate, aluminum hydroxide, potassium titanate, talc, kaolin clay, kaolinite, halloysite, pyrophyllite, montmorillonite, sericite, mica, amicite, bentonite, asbestos, zeolite, calcium silicate, magnesium silicate Etc.
  • alumina, silica and titania are particularly preferable as the main component of the inorganic particles of the heat-resistant layer 8.
  • the lower limit of the average particle diameter of the inorganic particles in the heat-resistant layer 8 is preferably 1 nm, and more preferably 7 nm.
  • the upper limit of the average particle diameter of the inorganic particles is preferably 5 ⁇ m and more preferably 1 ⁇ m.
  • Examples of the main component of the binder of the heat-resistant layer 8 include fluorine resins such as polyvinylidene fluoride and polytetrafluoroethylene, fluororubbers such as vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene copolymer, and styrene-butadiene copolymers.
  • fluorine resins such as polyvinylidene fluoride and polytetrafluoroethylene
  • fluororubbers such as vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene copolymer
  • styrene-butadiene copolymers styrene-butadiene copolymers.
  • the lower limit of the average thickness of the heat-resistant layer 8 is preferably 0.5 ⁇ m, and more preferably 1 ⁇ m.
  • the upper limit of the average thickness of the heat-resistant layer 8 is preferably 10 ⁇ m, and more preferably 6 ⁇ m.
  • the two separators 5 are welded to each other in the welding region A at the outer edge (near the outer edge). More specifically, the packaged positive electrode plate 3 has a plurality of welding regions A in which two separators 5 are linearly welded along four sides of an active material lamination region of the positive electrode plate 6 described later.
  • the positive electrode plate 6 Since the welding region A is formed around the positive electrode plate 6, the positive electrode plate 6 is accurately held at a predetermined position between the two separators 5. Thereby, the positive electrode plate 6 can be more reliably held in the projection region of the negative electrode plate 3 by aligning the lower end of the separator 5 with the lower end of the negative electrode plate 3 using a guide or the like. Moreover, you may align so that one side edge of the separator 5 and the side edge of the negative electrode plate 4 may overlap.
  • the welded area A where the two separators 5 are welded is more rigid than the two separators 5 (non-welded areas) that are stacked without being welded, the welded area A is brought into contact with the guide. By doing so, the packaged positive electrode plate 3 can be positioned relatively easily and accurately.
  • This welding region may be formed along the outer edge of the positive electrode plate 6 and is preferably formed along at least the outer edge of the positive electrode plate 6 excluding the side where a lead portion described later extends.
  • the welding region A is formed by welding the resin layers 7 of the two separators 5 while scraping the fragments of the heat-resistant layer 8 formed while breaking the heat-resistant layer 8 with a relatively small indenter in the width direction. Good.
  • the lower limit of the average width of the welding area A is preferably 10 ⁇ m, and more preferably 20 ⁇ m.
  • the upper limit of the average width of the welding region A is preferably 1000 ⁇ m, and more preferably 750 ⁇ m.
  • the lower limit of the average distance between the welding area A and the outer edge of the positive electrode plate 6 is preferably 0.1 mm, and more preferably 0.2 mm.
  • the upper limit of the average distance between the welding area A and the outer edge of the positive electrode plate 6 is preferably 1.0 mm, and more preferably 0.8 mm.
  • the positive electrode plate 6 does not become unnecessarily small with respect to the separator 5 and the negative electrode plate 4, and Energy density can be made large enough.
  • the lower limit of the average distance between the outer edge of the separator 5 and the welding area A is preferably 1 ⁇ m, and more preferably 10 ⁇ m.
  • the upper limit of the average distance between the outer edge of the separator 5 and the welding region A is preferably 1 mm, and more preferably 0.5 mm.
  • the weld region A may be formed continuously, but may be formed intermittently in order to improve the pouring property of the electrolyte.
  • the positive electrode plate 6 includes a conductive foil-shaped or sheet-shaped positive electrode current collector 9 and a positive electrode active material layer 10 laminated on the surface of the positive electrode current collector 9.
  • the positive electrode plate 6 includes an active material laminated region having a rectangular shape in plan view in which the positive electrode active material layer 10 is laminated on the surface of the positive electrode current collector 9, and the active material laminated region is more active than the active material laminated region. It has a configuration that includes a lead portion that extends in a narrow band shape and is connected to an electrode of the power storage element.
  • the positive electrode current collector 9 As a material of the positive electrode current collector 9, a metal such as aluminum, copper, iron, nickel, or an alloy thereof is used. Among these, aluminum, an aluminum alloy, copper, and a copper alloy are preferable from the balance between high conductivity and cost, and aluminum and an aluminum alloy are more preferable. Moreover, as a formation form of the positive electrode electrical power collector 9, foil, a vapor deposition film, etc. are mentioned, A foil is preferable from the surface of cost. That is, the positive electrode current collector 9 is preferably an aluminum foil. Examples of aluminum or aluminum alloy include A1085P and A3003P defined in JIS-H4000 (2014).
  • the lower limit of the average thickness of the positive electrode current collector 9 is preferably 5 ⁇ m, more preferably 10 ⁇ m.
  • the upper limit of the average thickness of the positive electrode current collector 9 is preferably 50 ⁇ m, more preferably 40 ⁇ m.
  • the positive electrode active material layer 10 is formed from a so-called positive electrode mixture containing a positive electrode active material. Moreover, the positive electrode mixture forming the positive electrode active material layer 10 includes optional components such as a conductive agent, a binder (binder), a thickener, and a filler as necessary.
  • Examples of the positive electrode active material include complex oxides (Li x CoO 2 , Li x NiO 2 , Li x Mn 2 O 4 , Li x ) represented by Li x MO y (M represents at least one transition metal).
  • MnO 3 Li x Ni ⁇ Co (1- ⁇ ) O 2 , Li x Ni ⁇ Mn ⁇ Co (1- ⁇ - ⁇ ) O 2 , Li x Ni ⁇ Mn (2- ⁇ ) O 4 ), Li w A polyanion compound (LiFePO 4 , LiMnPO 4 , LiNiPO 4 , LiCoPO 4 ) represented by Me x (XO y ) z (Me represents at least one transition metal, and X represents, for example, P, Si, B, V, etc.) Li 3 V 2 (PO 4 ) 3 , Li 2 MnSiO 4 , Li 2 CoPO 4 F, etc.).
  • the elements or polyanions in these compounds may be partially substituted with other elements or anion species.
  • the positive electrode active material layer 10 one kind of these compounds may be used alone, or two or more kinds may be mixed and used.
  • the crystal structure of the positive electrode active material is preferably a layered structure or a spinel structure.
  • cathode active material layer 10 As a minimum of content of a cathode active material in cathode active material layer 10, 50 mass% is preferred, 70 mass% is more preferred, and 80 mass% is still more preferred. On the other hand, as an upper limit of content of a positive electrode active material, 99 mass% is preferable and 94 mass% is more preferable. By setting the content of the positive electrode active material particles in the above range, the energy density of the power storage element can be increased.
  • the conductive agent is not particularly limited as long as it is a conductive material that does not adversely affect battery performance.
  • a conductive agent include carbon black such as natural or artificial graphite, furnace black, acetylene black, and ketjen black, metals, and conductive ceramics.
  • Examples of the shape of the conductive agent include powder and fiber.
  • the lower limit of the content of the conductive agent in the positive electrode active material layer 10 is preferably 0.1% by mass, and more preferably 0.5% by mass.
  • an upper limit of content of a electrically conductive agent 10 mass% is preferable and 5 mass% is more preferable.
  • binder examples include thermoplastic resins such as fluororesin (polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), etc.), polyethylene, polypropylene, polyimide; ethylene-propylene-diene rubber (EPDM), sulfonated EPDM. , Elastomers such as styrene butadiene rubber (SBR) and fluororubber; polysaccharide polymers and the like.
  • thermoplastic resins such as fluororesin (polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), etc.), polyethylene, polypropylene, polyimide; ethylene-propylene-diene rubber (EPDM), sulfonated EPDM.
  • EPDM ethylene-propylene-diene rubber
  • SBR styrene butadiene rubber
  • fluororubber polysaccharide polymers and the like.
  • the lower limit of the binder content in the positive electrode active material layer 10 is preferably 1% by mass, and more preferably 2% by mass. On the other hand, as an upper limit of content of a binder, 10 mass% is preferable and 5 mass% is more preferable. By setting the content of the binder in the above range, the positive electrode active material can be stably held.
  • the thickener examples include polysaccharide polymers such as carboxymethylcellulose (CMC) and methylcellulose.
  • CMC carboxymethylcellulose
  • methylcellulose a functional group that reacts with lithium
  • the filler is not particularly limited as long as it does not adversely affect battery performance.
  • the main component of the filler include polyolefins such as polypropylene and polyethylene, silica, alumina, zeolite, glass, and carbon.
  • the negative electrode plate 4 is laminated without being packed in the laminated electrode body.
  • the negative electrode plate 4 has a conductive foil-like or sheet-like negative electrode current collector 11 and a negative electrode active material layer 12 laminated on the surface of the negative electrode current collector 11. Specifically, the negative electrode plate 4 has an active material laminated region having a rectangular shape in plan view in which the active material layer 12 is laminated on the surface of the negative electrode current collector 11, and a width wider than the active material laminated region from the active material laminated region. And a lead portion connected to the electrode.
  • the laminated electrode body 1 all the welding regions A of the separator 5 of the packaged positive electrode plate 3 are included inside the active material laminated region of the negative electrode plate 4 in a plan view. Therefore, since the active material lamination region of the positive electrode plate 6 included inside the welding region A of the two separators 5 is disposed within the projection region of the active material lamination region of the negative electrode plate 4, Do not concentrate current on the outer edge of the material stacking area.
  • the negative electrode current collector 11 can have the same configuration as the positive electrode current collector 9 described above, but the material is preferably copper or a copper alloy. That is, the negative electrode current collector 11 of the negative electrode plate 4 is preferably a copper foil. Examples of the copper foil include rolled copper foil and electrolytic copper foil.
  • the negative electrode active material layer 12 is formed from a so-called negative electrode plate mixture containing a negative electrode active material. Moreover, the negative electrode plate mixture forming the negative electrode active material layer 12 includes optional components such as a conductive agent, a binder (binder), a thickener, and a filler as necessary. The same components as those of the positive electrode active material layer 10 can be used as optional components such as a conductive agent, a binder, a thickener, and a filler.
  • the negative electrode active material a material capable of inserting and extracting lithium ions is preferably used.
  • the negative electrode active material include metals such as lithium and lithium alloys; metal oxides; polyphosphate compounds; carbon materials such as graphite and amorphous carbon (easily graphitizable carbon or non-graphitizable carbon). Can be mentioned.
  • Si, Si oxide, Sn, Sn oxide, or a combination thereof is used from the viewpoint of setting the discharge capacity per unit facing area between the positive electrode plate 6 and the negative electrode plate 4 to a suitable range. It is preferable to use Si oxide. Si and Sn can have a discharge capacity about three times that of graphite when they are made into oxides.
  • the ratio of the number of atoms of O to Si contained in the Si oxide is preferably more than 0 and less than 2. That is, as the Si oxide, a compound represented by SiO x (0 ⁇ x ⁇ 2) is preferable. The ratio of the number of atoms is more preferably 0.5 or more and 1.5 or less.
  • the negative electrode active material may be used alone or in combination of two or more.
  • the discharge capacity per unit facing area between the positive electrode plate 6 and the negative electrode plate 4 and the mass of the negative electrode active material to be described later can be reduced. Both of the mass ratios can be adjusted to be suitable values.
  • Other negative electrode active materials used in combination with Si oxide include carbon materials such as graphite, hard carbon, soft carbon, coke, acetylene black, ketjen black, vapor grown carbon fiber, fullerene, activated carbon and the like. . Only one kind of these carbon materials may be mixed with Si oxide, or two or more kinds may be mixed with Si oxide in an arbitrary combination and ratio.
  • graphite having a relatively low charge / discharge potential is preferable, and a secondary battery element having a high energy density can be obtained by using graphite.
  • graphite used by mixing with Si oxide include flaky graphite, spherical graphite, artificial graphite, and natural graphite. Among these, scaly graphite that can easily maintain contact with the surface of the Si oxide particles even after repeated charge and discharge is preferable.
  • the upper limit of the content of Si oxide is usually 100% by mass, and preferably 90% by mass.
  • the negative electrode active material layer 12 includes a small amount of typical nonmetallic elements such as B, N, P, F, Cl, Br, and I, Li, Na, Mg, Al, K, Ca, Zn in addition to Si oxide.
  • typical metal elements such as Ga, Ge, and transition metal elements such as Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Mo, Zr, Ta, Hf, Nb, and W may be contained. .
  • Si oxide (substance represented by the general formula SiO x ), it is preferable to use a material containing both phases of SiO 2 and Si. Such Si oxide has a small volume change and excellent charge / discharge cycle characteristics because lithium is occluded and released from Si in the SiO 2 matrix.
  • the average particle size of the Si oxide is preferably 1 ⁇ m or more and 15 ⁇ m or less. By setting the average particle diameter of the Si oxide to the upper limit or less, the charge / discharge cycle characteristics of the power storage element can be improved.
  • the Si oxide can be used from a highly crystalline one to an amorphous one. Further, as the Si oxide, one washed with an acid such as hydrogen fluoride or sulfuric acid or one reduced with hydrogen may be used.
  • an acid such as hydrogen fluoride or sulfuric acid or one reduced with hydrogen
  • the lower limit of the content of the negative electrode active material in the negative electrode active material layer 12 is preferably 60% by mass, more preferably 80% by mass, and even more preferably 90% by mass.
  • an upper limit of content of a negative electrode active material 99 mass% is preferable and 98 mass% is more preferable.
  • the lower limit of the binder content in the negative electrode active material layer 12 is preferably 1% by mass, and more preferably 5% by mass. On the other hand, as an upper limit of content of a binder, 20 mass% is preferable and 15 mass% is more preferable. By setting the content of the binder in the above range, the negative electrode active material can be stably held.
  • the exterior material 2 accommodates the laminated electrode body 1 and an electrolyte is enclosed therein.
  • a resin or the like may be used as long as it has a sealing property that can enclose an electrolyte and a strength that can protect the laminated electrode body 1, but a metal is preferably used. In other words, it is preferable to use a metal case that can more reliably protect the laminated electrode body 1 as the exterior material 2.
  • a known electrolytic solution that is usually used for a power storage element can be used.
  • cyclic carbonates such as ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate (BC), or diethyl
  • LiPF 6 lithium hexafluorophosphate
  • a solvent containing a chain carbonate such as carbonate (DEC), dimethyl carbonate (DMC), or ethyl methyl carbonate (EMC)
  • the weld portion may be formed in a shape other than a linear shape.
  • the welded part may be formed in a plurality of dots arranged outside the active material lamination region of the positive electrode plate.
  • the laminated electrode body and the electricity storage device according to the present invention can be particularly suitably used as a power source for equipment that requires a relatively large energy density, such as an electric vehicle and a mobile phone.

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  • Chemical Kinetics & Catalysis (AREA)
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  • Engineering & Computer Science (AREA)
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Abstract

La présente invention aborde le problème de la fourniture d'un corps d'électrode stratifié et d'un élément de stockage d'électricité qui sont relativement faciles à produire, et qui permettent d'obtenir une position relative comparativement précise entre une plaque d'électrode positive retournée et une plaque d'électrode négative. Le corps d'électrode stratifié selon un mode de réalisation de la présente invention est pourvu de : une plaque d'électrode positive retournée qui est formée en disposant une plaque d'électrode positive ayant une région stratifiée de matériau actif de forme rectangulaire telle qu'observée dans une vue en plan entre deux séparateurs ayant chacun une couche de résine et une couche résistante à la chaleur formée sur la couche de résine, et par soudage des deux séparateurs sur le côté externe de la région stratifiée de matériau actif de la plaque d'électrode positive ; et une plaque d'électrode négative qui n'est pas retournée, la plaque d'électrode positive retournée et la plaque d'électrode négative étant stratifiées de sorte que des régions soudées des séparateurs de la plaque d'électrode positive retournée soient incluses dans une région de projection de l'électrode négative dans une vue en plan.
PCT/JP2017/030752 2016-08-29 2017-08-28 Corps d'électrode stratifié et élément de stockage d'électricité Ceased WO2018043406A1 (fr)

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JP2018537256A JPWO2018043406A1 (ja) 2016-08-29 2017-08-28 積層電極体及び蓄電素子
CN201780052920.XA CN110062975A (zh) 2016-08-29 2017-08-28 层叠电极体及蓄电元件
DE112017004366.2T DE112017004366T5 (de) 2016-08-29 2017-08-28 Laminierter elektrodenkörper und elektrisches speicherelement

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JP2016-167373 2016-08-29

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