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WO2018038529A1 - Cellule de test à fiabilité élevée dans un test de propriétés d'électrode - Google Patents

Cellule de test à fiabilité élevée dans un test de propriétés d'électrode Download PDF

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Publication number
WO2018038529A1
WO2018038529A1 PCT/KR2017/009206 KR2017009206W WO2018038529A1 WO 2018038529 A1 WO2018038529 A1 WO 2018038529A1 KR 2017009206 W KR2017009206 W KR 2017009206W WO 2018038529 A1 WO2018038529 A1 WO 2018038529A1
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WO
WIPO (PCT)
Prior art keywords
electrode
reference electrode
test cell
measuring
lithium
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/KR2017/009206
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English (en)
Korean (ko)
Inventor
정혜란
최영근
오송택
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.)
LG Chem Ltd
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LG Chem 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
Priority claimed from KR1020170106290A external-priority patent/KR102003709B1/ko
Application filed by LG Chem Ltd filed Critical LG Chem Ltd
Priority to US16/082,840 priority Critical patent/US11081736B2/en
Priority to CN201780004284.3A priority patent/CN108369259B/zh
Priority to EP17843949.3A priority patent/EP3370075A4/fr
Publication of WO2018038529A1 publication Critical patent/WO2018038529A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • 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

Definitions

  • the present invention relates to a test cell with high reliability for electrode characteristic testing.
  • lithium secondary battery cells such as lithium ion batteries, lithium ion polymer batteries, etc., which have advantages such as high energy density, discharge voltage, and output stability.
  • the potential, output, and capacity of the electrode are measured. This may be done in the development stage of the electrode or for quality discrimination of the mass produced electrode.
  • the performance test of the electrode is a coin cell (combination) of a combination of the pure lithium electrode and the electrode to be measured, which is already known characteristics, such as electrode potential or electrode resistance to enable accurate characteristics measurement After manufacturing, while repeatedly charging and discharging, the life characteristics, output characteristics and capacitance characteristics of the electrode are measured.
  • the can-type battery case used in manufacturing a coin cell has a high resistance, and thus, it is difficult to confirm precise output characteristics.
  • the present invention aims to solve the problems of the prior art as described above and the technical problems that have been requested from the past.
  • the object of the present invention unlike the conventional coin cell, it is possible to minimize the error of the measurement of the electrode characteristics by using a second reference electrode that can measure the characteristic change of the lithium electrode, while allowing accurate output characteristics of low resistance. To provide a test cell that can.
  • the test cell of the present invention for achieving the above object is a test cell for measuring the electrode characteristics, the electrode assembly including a first reference electrode, a second reference electrode, and a first electrode to be measured characteristics, It is sealed with the electrolyte solution in the state accommodated in the pouch type battery case of a laminate sheet.
  • the test cell according to the present invention instead of the can type battery case having a high resistance, the battery case is composed of a laminate sheet having a relatively low contact resistance, so that the resistance due to the battery case compared to the conventional coin cell is more accurate output You can check the characteristics.
  • test cell has a double check system for confirming electrode characteristics with the first reference electrode and the second reference electrode, and as described below, there is an advantage in that an error is significantly low in measuring the characteristics of the electrode.
  • a test cell measures an output characteristic and a capacitance characteristic of a first electrode by an electrochemical reaction between the first reference electrode and the first electrode;
  • the second reference electrode changes in electrochemical properties of the first reference electrode and the first electrode can be confirmed.
  • the test cell of the present invention checks the change of the electrochemical characteristics of the first reference electrode and the first electrode through the second reference electrode, and double checks to confirm the electrochemical characteristics of the first electrode through the first reference electrode.
  • the electrochemical reaction between the second reference electrode and the first electrode is negligible, so it is necessary to largely reflect the change in the electrochemical characteristics of the second reference electrode in determining the characteristics of the first reference electrode or the first electrode. It may not be.
  • test cell of the present invention can provide highly reliable measured values. It can be.
  • the first reference electrode is a lithium electrode made of pure lithium, the pure lithium can form a plate-shaped electrode.
  • the second reference electrode has a structure in which an electrode active material is coated on a main body of a wire structure made of copper (Cu) or aluminum (Al);
  • the test cell may have a structure in which the battery case is sealed while a part of the wire of the second reference electrode is led out of the battery case.
  • the second reference electrode is disposed between the first reference electrode and the first electrode, not only the relative potential with respect to each of the first reference electrode and the second reference electrode can be measured, By measuring the relative potential with respect to the first reference electrode at the location where the actual electrochemical reaction occurs, it is possible to precisely check the change in the electrochemical properties of the first reference electrode.
  • the second reference electrode is disposed between the first reference electrode and the first electrode in a small wire structure, there is little increase in the overall volume of the battery cell due to the second reference electrode, and the surface area is also small. It has the advantage of low contact resistance.
  • the second reference electrode has a wire structure extending from the inside of the test cell to the outside, and the user can easily measure the relative potential by connecting a potential measuring device to the second reference electrode on the outside. You can also use the test cell with the wire cut.
  • the electrode active material constituting the second reference electrode should be a stable material having low reactivity with the electrolyte and not interfering with the reversibility of lithium ions, and having a constant voltage range in a wide capacitance range for use as a reference electrode.
  • the material is not particularly limited, but in detail, the material may be lithium titanium oxide (LTO) having high structural stability and slow electrode degradation.
  • the first reference electrode serves as a cathode for the first electrode and the second reference electrode
  • the second reference electrode serves as a reference electrode for the first reference electrode and the first electrode. do.
  • the first electrode acts only as an anode
  • the second reference electrode acts as a reference electrode for the first reference electrode and the first electrode.
  • the electrochemical reaction of the second reference electrode in the test cell is negligible and may hardly affect the capacity or the life of the actual test cell.
  • the second reference electrode may measure a relative potential with respect to each of the first electrode and the first reference electrode in the test cell.
  • the electrode assembly may have a structure in which the first reference electrode, the first separator, the second reference electrode, the second separator and the first electrode are sequentially stacked.
  • the present invention also provides a method for measuring the characteristics of the first electrode using the test cell
  • step (ii) further measuring an electrode potential change of the first reference electrode based on the second reference electrode during the measurement of step (i);
  • the change of the electrochemical characteristics of the first reference electrode and the first electrode through the second reference electrode, and the double check of the electrochemical characteristics of the first electrode through the first reference electrode It is composed of a check system, according to the change in the electrochemical characteristics of the first reference electrode, and reflects the change in real time as the overall characteristics of the first reference electrode to the error and error of the output characteristics and capacitance characteristics of the first electrode It can be predicted.
  • the method of the present invention can more accurately confirm the first electrode characteristics, regardless of the number of cycles, and more accurately measure the electrode characteristics of the first electrode.
  • the internal resistance of the test cell may be 0.5 ⁇ to 5 ⁇ .
  • the first electrode may be an electrode for forming a positive electrode or a negative electrode of a lithium secondary battery.
  • the first electrode is prepared by applying a mixture of a positive electrode active material, a conductive material, and a binder to a positive electrode current collector, followed by drying, and optionally, a filler is further added to the mixture.
  • the positive electrode current collector is generally made to a thickness of 3 to 500 micrometers.
  • the positive electrode current collector and the extension current collector are not particularly limited as long as they have high conductivity without causing chemical change in the battery.
  • stainless steel, aluminum, nickel, titanium, calcined carbon, or aluminum Surface treated with carbon, nickel, titanium, silver or the like on the surface of the stainless steel may be used.
  • the positive electrode current collector and the extension current collector may form fine irregularities on the surface thereof to increase adhesion of the positive electrode active material, and may be in various forms such as a film, a sheet, a foil, a net, a porous body, a foam, and a nonwoven fabric.
  • the conductive material is typically added in an amount of 1 to 30 wt% based on the total weight of the mixture including the positive electrode active material.
  • a conductive material is not particularly limited as long as it has conductivity without causing chemical change in the battery, and examples thereof include graphite such as natural graphite and artificial graphite; Carbon blacks such as carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, and summer black; Conductive fibers such as carbon fibers and metal fibers; Metal powders such as carbon fluoride powder, aluminum powder and nickel powder; Conductive whiskeys such as zinc oxide and potassium titanate; Conductive metal oxides such as titanium oxide; Conductive materials such as polyphenylene derivatives and the like can be used.
  • the binder is a component that assists the bonding of the active material and the conductive material to the current collector, and is generally added in an amount of 1 to 30 wt% based on the total weight of the mixture including the positive electrode active material.
  • binders include polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene , Polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, fluorine rubber, various copolymers and the like.
  • the filler is optionally used as a component for inhibiting expansion of the positive electrode, and is not particularly limited as long as it is a fibrous material without causing chemical change in the battery.
  • the filler include olefinic polymers such as polyethylene and polypropylene; Fibrous materials, such as glass fiber and carbon fiber, are used.
  • the first electrode is manufactured by coating and drying a negative electrode active material on a negative electrode current collector, and optionally, the components as described above may be further included as necessary.
  • the negative electrode current collector is generally made to a thickness of 3 to 500 micrometers.
  • Such a negative electrode current collector and / or an extension current collector is not particularly limited as long as it has conductivity without causing chemical change in the battery.
  • copper, stainless steel, aluminum, nickel, titanium, calcined carbon, Surface treated with carbon, nickel, titanium, silver, or the like on the surface of copper or stainless steel, aluminum-cadmium alloy, and the like can be used.
  • fine concavities and convexities may be formed on the surface to enhance the bonding strength of the negative electrode active material, and may be used in various forms such as a film, a sheet, a foil, a net, a porous body, a foam, and a nonwoven fabric.
  • carbon such as hardly graphitized carbon and graphite type carbon
  • Metal complex oxides such as these; Lithium metal; Lithium alloys; Silicon-based alloys; Tin-based alloys; SnO, SnO 2 , PbO, PbO 2 , Pb 2 O 3 , Pb 3 O 4 , Sb 2 O 3 , Sb 2 O 4 , Sb 2 O 5 , GeO, GeO 2 , Bi 2 O 3 , Bi 2 O 4 , and metal oxides such as Bi 2 O 5 ; Conductive polymers such as
  • the separator is interposed between the anode and the cathode, an insulating thin film having high ion permeability and mechanical strength is used.
  • the pore diameter of the separator is generally from 0.01 to 10 micrometers, the thickness is generally from 5 to 300 micrometers.
  • Such a separator in addition to the SRS (Safety-Reinforcing Separators) separator of the organic / inorganic composite porous described above; For example, olefin polymers, such as polypropylene of chemical resistance and hydrophobicity; Sheets or non-woven fabrics made of glass fibers or polyethylene are used.
  • a solid electrolyte such as a polymer is used as the electrolyte, the solid electrolyte may also serve as a separator.
  • the electrolyte may be a lithium salt-containing non-aqueous electrolyte, and consists of a non-aqueous electrolyte and a lithium salt.
  • nonaqueous electrolyte nonaqueous organic solvents, organic solid electrolytes, inorganic solid electrolytes, and the like are used, but not limited thereto.
  • non-aqueous organic solvent examples include N-methyl-2-pyrrolidinone, propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, and gamma Butyl lactone, 1,2-dimethoxy ethane, tetrahydroxy franc, 2-methyl tetrahydrofuran, dimethyl sulfoxide, 1,3-dioxorone, formamide, dimethylformamide, dioxolon , Acetonitrile, nitromethane, methyl formate, methyl acetate, phosphate triester, trimethoxy methane, dioxorone derivatives, sulfolane, methyl sulfolane, 1,3-dimethyl-2-imidazolidinone, propylene carbo Aprotic organic solvents such as nate derivatives, tetrahydrofuran derivatives, ethers, methyl pyroionate and ethyl propionate can be
  • organic solid electrolyte examples include polyethylene derivatives, polyethylene oxide derivatives, polypropylene oxide derivatives, phosphate ester polymers, polyedgetion lysine, polyester sulfides, polyvinyl alcohols, polyvinylidene fluorides, Polymers containing ionic dissociating groups and the like can be used.
  • Examples of the inorganic solid electrolyte include Li 3 N, LiI, Li 5 NI 2 , Li 3 N-LiI-LiOH, LiSiO 4 , LiSiO 4 -LiI-LiOH, Li 2 SiS 3 , Li 4 SiO 4 , Nitrides, halides, sulfates and the like of Li, such as Li 4 SiO 4 -LiI-LiOH, Li 3 PO 4 -Li 2 S-SiS 2 , and the like, may be used.
  • the lithium salt is a good material to be dissolved in the non-aqueous electrolyte, for example, LiCl, LiBr, LiI, LiClO 4 , LiBF 4 , LiB 10 Cl 10 , LiPF 6 , LiCF 3 SO 3 , LiCF 3 CO 2 , LiAsF 6, LiSbF 6, LiAlCl 4, CH 3 SO 3 Li, CF 3 SO 3 Li, (CF 3 SO 2) 2 NLi, chloroborane lithium, lower aliphatic carboxylic acid lithium, lithium tetraphenyl borate and imide have.
  • pyridine triethyl phosphite, triethanolamine, cyclic ether, ethylene diamine, n-glyme, hexaphosphate triamide, Nitrobenzene derivatives, sulfur, quinone imine dyes, N-substituted oxazolidinones, N, N-substituted imidazolidines, ethylene glycol dialkyl ethers, ammonium salts, pyrroles, 2-methoxy ethanol, aluminum trichloride and the like may be added.
  • pyridine triethyl phosphite, triethanolamine, cyclic ether, ethylene diamine, n-glyme, hexaphosphate triamide
  • Nitrobenzene derivatives sulfur, quinone imine dyes, N-substituted oxazolidinones, N, N-substituted imidazolidines, ethylene glycol dialkyl ethers, ammonium salts, pyr
  • a halogen-containing solvent such as carbon tetrachloride or ethylene trifluoride may be further included, and carbon dioxide gas may be further included to improve high temperature storage characteristics, and FEC (Fluoro-Ethylene) may be further included. Carbonate), PRS (Propene sultone) may be further included.
  • lithium salts such as LiPF 6 , LiClO 4 , LiBF 4 , LiN (SO 2 CF 3 ) 2, and the like, may be prepared by cyclic carbonate of EC or PC, which is a highly dielectric solvent, and DEC, DMC, or EMC, which are low viscosity solvents.
  • Lithium salt-containing non-aqueous electrolytes can be prepared by adding them to a mixed solvent of linear carbonates.
  • the battery case is composed of a laminate sheet having a relatively low contact resistance. Lower accuracy allows for more accurate output characteristics.
  • test cell has a double check system that checks electrode characteristics with the first reference electrode and the second reference electrode, and has an advantage that the error is significantly low in measuring the characteristics of the electrode.
  • FIG. 1 is a schematic diagram based on a vertical section of a test cell according to one embodiment of the present invention
  • FIG. 2 is a schematic diagram of the top of a test cell
  • FIG. 3 is a schematic diagram of a second reference electrode
  • FIG. 4 is a flowchart of a test cell using method according to an embodiment of the present invention.
  • FIG. 1 is a schematic diagram based on a vertical cross section of a test cell according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of an upper portion of a test cell
  • 3 shows a schematic diagram of the second reference electrode.
  • the test cell 100 includes a first reference electrode 110 made of pure lithium, a second reference electrode 120 including an LTO electrode active material, and a first electrode to be measured.
  • the electrode assembly including 102 is sealed together with the electrolyte in a state of being housed in the pouch type battery case 104 of the laminate sheet.
  • the battery case 104 is formed of a laminate sheet having a relatively low contact resistance. The resistance due to the case 104 is low. This allows for more accurate measurements when checking the output characteristics.
  • the electrode assembly has a structure in which the first reference electrode 110, the first separator, the second reference electrode 120, the second separator and the first electrode 102 are sequentially stacked.
  • the second reference electrode 120 is a structure in which an electrode active material 124 is coated on a main body 122 of a wire structure made of copper (Cu), and the test cell 100 includes a second reference electrode 120.
  • a portion of the main body 122 of the wire structure of) may be a structure in which the battery case 104 is sealed in a state in which a part of the main body 122 is led out of the battery case 104.
  • the second reference electrode 120 is disposed between the first reference electrode 110 and the first electrode 102, relative potentials to the first reference electrode 110 and the second reference electrode 120, respectively. Not only can be measured, it is possible to accurately determine the change in the electrochemical properties of the first reference electrode 110 by measuring the relative potential with respect to the first reference electrode 110 at the location where the actual electrochemical reaction occurs.
  • the second reference electrode 120 is a wire structure extending from the inside of the test cell 100 to the outside, and the user can easily measure the relative potential by connecting a potential measuring device to the second reference electrode 120 on the outside. Can be. In some cases, the test cell 100 may be used while cutting the extended wire.
  • the first reference electrode 110 acts as a cathode for the first electrode 102 and the second reference electrode 120, and the second reference electrode 120 serves as the first reference electrode. It acts as a reference electrode for the 110 and the first electrode 102.
  • test cell 100 may measure the output characteristics and the capacitance characteristics of the first electrode 102 by an electrochemical reaction between the first reference electrode 110 and the first electrode 102, and the second reference electrode ( 120, a change in electrochemical properties of the first reference electrode 110 can be confirmed.
  • test cell 100 of the present invention checks the change in the electrochemical characteristics of the first reference electrode 110 through the second reference electrode 120, and the first electrode (1) through the first reference electrode 110. It consists of a double check system to confirm the electrochemical properties of 102.
  • the electrochemical reaction between the second reference electrode 120 and the first electrode 102 in the test cell 100 may be negligible.
  • FIG. 4 provides a method of measuring characteristics of the first electrode 102 using the test cell 100.
  • the first reference electrode 110, the first separator, the second reference electrode 120, the second separator and the first electrode 102 are formed.
  • the battery case 104 is sealed to prepare a test cell 100.
  • the pouch type battery case may use a laminate sheet.
  • the laminate sheet may have a multi-layered structure and may consist of an outermost outer coating layer, a metal layer that prevents penetration of material, and an inner sealant layer for sealing.
  • the inner sealant layer is thermally fused to each other by applied heat and pressure in a state in which the electrode assembly is embedded, and serves to provide a sealability, and mainly consists of CPP (non-stretched polypropylene film).
  • the metal layer may be aluminum (Al) to exhibit a function of preventing the inflow or leakage of foreign matter.
  • the metal layer may have a structure in which a chromium oxide film is formed on a surface thereof, and the film serves to prevent oxidation and corrosion of the metal layer by forming an oxide film in air by combining chromium contained in the metal layer with oxygen.
  • the chromium oxide film may be made of chromium trivalent oxide (Cr 2 O 3 ).
  • the thickness of the laminate sheet may be 70 ⁇ m to 150 ⁇ m, specifically 80 ⁇ m to 140 ⁇ m, and more specifically 100 ⁇ m to 130 ⁇ m.
  • the thickness of the laminate sheet is a thickness including all of the thicknesses of the resin layer, at least one metal layer, and the sealant layer.
  • the thickness of the metal layer is also reduced in proportion to protect the battery cell from external shock. It may be difficult, and if it is larger than 150 ⁇ m because the weight and volume of the entire secondary battery is increased, there is a problem that can be limited device applied is not preferable.
  • the laminate sheet may be configured to include one metal layer, in this case, the thickness of the metal layer may be formed from 10 ⁇ m to 100 ⁇ m within the range of the thickness of the laminate sheet described above And in detail, it may be formed of 15 ⁇ m to 80 ⁇ m.
  • the thickness of the metal layer is thinner than 10 mu m, it is difficult to exert an effect of improving mechanical strength.
  • the thickness of the laminate sheet increases, which makes it difficult to provide a compact secondary battery.
  • the laminate sheet may be a composition including two metal layers.
  • two metal layers when two metal layers are included, in order to prevent the thickness of the entire laminate sheet from increasing, it is preferable to use a thin metal layer as compared with the case where the metal layer has a thickness of 20 ⁇ m to 20 ⁇ m. It may be formed to 50 ⁇ m, in detail may be formed from 25 ⁇ m to 40 ⁇ m.
  • the adhesive layer is epoxy, phenolic, melamine, polyimide, polyester-based It may be made of one or more selected from the group consisting of urethane-based, polyethylene terephthalate-based and polyether urethane-based materials.
  • step 220 the charging and discharging of the test cell 100 is repeatedly performed in step 220, and when an arbitrary cycle in which the charging and discharging cycle is selected from 10 to 100 is completed, the process 230 is performed.
  • an operation 230a of measuring output and capacitance characteristics of the test cell 100 and an electrode potential change of the first reference electrode 110 are measured 230b.
  • steps 230a and 230b are irrelevant and may be performed simultaneously.
  • the characteristic of the test cell 100 measured in the process 230a may be assumed to be the characteristic of the first electrode 102, which indicates a state in which the overall performance of the first reference electrode 110 made of pure lithium is recognized in advance. On the premise.
  • the change of the electrode potential of the first reference electrode 110 is further measured based on the second reference electrode 120 to measure the electrochemical change of the first reference electrode 110.
  • the process 240 proceeds to correct the measured value of the process 230a based on the change of the electrode potential of the first reference electrode 110, thereby adjusting the first value based on the electrochemical change of the first reference electrode 110. Errors and errors in the output characteristics and the capacitance characteristics of the electrode 102 are predicted and reflected.
  • the characteristic of the first electrode 102 may be determined based on the corrected data.
  • the process 230 to 250 may be sequentially performed to sequentially perform the first cycle according to the cycle.
  • the reduction of the output characteristic and the capacitance characteristic of the electrode 102 is measured precisely.
  • Plate-shaped pure lithium metal was prepared as a first reference electrode.
  • LiNiCoMnO 2 96% by weight of LiNiCoMnO 2 , 2 % by weight Denka black (conductive material) and 2% by weight PVDF (polyvinylidene fluoride, binder) were added to slurry the cathode mixture.
  • NMP N-Methyl-2-Pyrrolidone
  • Ethylene carbonate in the electrode assembly having a structure in which the first reference electrode, the first separator (polypropylene-based porous membrane), the second reference electrode, the second separator (polypropylene-based porous membrane), and the first electrode are sequentially stacked (EC) and an electrolyte solution in which 1M lithium hexafluorophosphate (LiPF 6 ) was dissolved were injected into a solvent in which ethyl methyl carbonate (DEC) was mixed at a volume ratio of 50:50. Thereafter, the battery cell was sealed in a pouch-type battery case of a laminate sheet, and a test cell was manufactured by sealing the battery case.
  • EC lithium hexafluorophosphate
  • LiNiCoMnO 2 96% by weight of LiNiCoMnO 2 , 2 % by weight Denka black (conductive material) and 2% by weight PVDF (polyvinylidene fluoride, binder) were added to N-Methyl-2-Pyrrolidone (NMP) to slurry the cathode mixture.
  • NMP N-Methyl-2-Pyrrolidone
  • the prepared positive electrode mixture slurry was coated on one surface of an aluminum current collector to a thickness of 100 ⁇ m, dried and rolled, and then punched to a predetermined size to prepare an electrode.
  • As the counter electrode a plate-shaped pure lithium metal was prepared.
  • the test cell of the embodiment has much smaller capacity retention variation and resistance variation than the test cell of the comparative example, and thus it can be confirmed that the reliability of the electrode characteristic test is high.

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Abstract

La présente invention concerne une cellule de test destinée à mesurer des propriétés d'électrode, dans laquelle un ensemble d'électrodes comprenant une première électrode de référence, une deuxième électrode de référence et une première électrode soumise à une mesure de propriété est stocké et scellé le long d'un électrolyte dans un boîtier de cellule de type poche constitué d'une feuille stratifiée.
PCT/KR2017/009206 2016-08-23 2017-08-23 Cellule de test à fiabilité élevée dans un test de propriétés d'électrode Ceased WO2018038529A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US16/082,840 US11081736B2 (en) 2016-08-23 2017-08-23 Test cell with high reliability in electrode characteristic test
CN201780004284.3A CN108369259B (zh) 2016-08-23 2017-08-23 在电极特性测试中具有高可靠性的测试电池
EP17843949.3A EP3370075A4 (fr) 2016-08-23 2017-08-23 Cellule de test à fiabilité élevée dans un test de propriétés d'électrode

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2016-0106913 2016-08-23
KR20160106913 2016-08-23
KR1020170106290A KR102003709B1 (ko) 2016-08-23 2017-08-22 전극 특성 테스트에 대한 신뢰성이 높은 테스트 셀
KR10-2017-0106290 2017-08-22

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108519410A (zh) * 2018-03-15 2018-09-11 合肥国轩高科动力能源有限公司 一种表征循环过程中电解液中锂离子浓度变化的方法
CN113140820A (zh) * 2021-03-22 2021-07-20 同济大学 一种精确测量用三电极扣式电池装置及应用

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CN108519410A (zh) * 2018-03-15 2018-09-11 合肥国轩高科动力能源有限公司 一种表征循环过程中电解液中锂离子浓度变化的方法
CN113140820A (zh) * 2021-03-22 2021-07-20 同济大学 一种精确测量用三电极扣式电池装置及应用

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