WO2016148408A1 - 일체형 전극조립체 및 이를 포함하는 전기화학소자 - Google Patents
일체형 전극조립체 및 이를 포함하는 전기화학소자 Download PDFInfo
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- WO2016148408A1 WO2016148408A1 PCT/KR2016/001682 KR2016001682W WO2016148408A1 WO 2016148408 A1 WO2016148408 A1 WO 2016148408A1 KR 2016001682 W KR2016001682 W KR 2016001682W WO 2016148408 A1 WO2016148408 A1 WO 2016148408A1
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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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
- H01M50/46—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
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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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
- 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
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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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
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
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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
- H01M50/431—Inorganic material
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/021—Physical characteristics, e.g. porosity, surface area
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- 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
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- 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 an integrated electrode assembly and an electrochemical device comprising the same.
- lithium ion batteries developed in the early 1990s have a higher operating voltage and greater energy density than conventional batteries such as Ni-MH, Ni-Cd, and sulfuric acid-lead batteries that use an aqueous electrolyte solution. I am in the spotlight.
- lithium ion batteries have safety problems such as ignition and explosion due to the use of the organic electrolyte, and are difficult to manufacture.
- a lithium ion battery and a lithium ion polymer battery typically use a polyolefin-based separator to prevent short circuit between the positive electrode and the negative electrode.
- polyolefin-based separators are inherently high temperature at high temperatures due to the properties of the separator material, such as the properties and processing properties of polyolefin-based melts usually below 200 ° C., such as the stretching process for pore size and porosity control. It has the disadvantage of heat shrinking in size. Therefore, when the battery rises to a high temperature due to internal / external stimulation, the possibility of short-circuit between the positive electrode and the negative electrode increases due to shrinkage or melting of the separator, and thus the battery has a great risk of explosion, etc. It becomes visible.
- an electrode-separator integrated electrode assembly has been proposed in which an inorganic coating layer is formed on an electrode active material layer to serve as a conventional separator.
- the inorganic coating layer formed on the electrode active material layer is not coated on a substrate such as a polyolefin-based film, and thus has a low mechanical strength and easily cracks. Therefore, safety is secured in the electrochemical device using the same. There was a difficult problem.
- an object of the present invention is to provide an electrode-separator integrated electrode assembly in which the components constituting the electrode assembly are adhered with excellent adhesion and the internal short circuit between the electrodes can be effectively prevented.
- Another object of the present invention is to provide a method of manufacturing the integrated electrode assembly.
- Another object of the present invention to provide an electrochemical device exhibiting excellent battery performance, including the integrated electrode assembly.
- the anode, the first binder polymer layer, the inorganic coating layer comprising a plurality of inorganic particles and the second binder polymer, the third binder polymer layer and the negative electrode are sequentially stacked
- An integrated electrode assembly is provided that is coupled.
- Internal short circuit of the positive electrode and the negative electrode can be prevented by the inorganic coating layer.
- the inorganic particles constituting the inorganic coating layer may be inorganic particles having a dielectric constant of 5 or more or a mixture thereof.
- the inorganic particles having a dielectric constant of 5 or more include BaTiO 3 , SnO 2 , CeO 2 , MgO, Mg (OH) 2 , NiO, CaCO 3 , CaO, ZnO, ZrO 2 , Y 2 O 3 , SiO 2 , Al (OH) 3 , AlOOH, Al 2 O 3 and TiO 2 may be one or a mixture of two or more selected from the group consisting of.
- the first binder polymer layer and the third binder polymer layer may each independently have a thickness in the range of 0.2 to 5.0 ⁇ m.
- the electrode may include a current collector and an electrode active material layer formed on at least one surface of the current collector, and the first binder polymer layer, the second binder polymer layer, or both thereof may contact the electrode active material layer.
- an electrochemical device comprising the above electrode assembly, the electrochemical device may be a lithium secondary battery.
- the method of manufacturing a separator-integrated electrode assembly comprising: Is provided.
- the method of manufacturing a separator-integrated electrode assembly is provided.
- the first binder polymer coating layer and the third binder polymer layer may be simultaneously formed by a dip coating method.
- the electrode assembly according to an aspect of the present invention is manufactured so that the inorganic coating layer for integrally binding the electrode to prevent the internal short circuit of the positive electrode and the negative electrode, thereby ensuring excellent adhesion between the electrode and the inorganic coating layer.
- the lithium secondary battery using the integrated electrode assembly according to the present invention may have excellent cycle characteristics.
- the inorganic coating layer is attached to the electrode through the binder polymer layer, the durability of the inorganic coating layer is improved to effectively solve the problem of over time cracking of the conventional inorganic coating layer.
- the binder polymer layer is not directly formed on the electrode, there is no problem in that the structure of the electrode active material layer, which is a problem when the binder polymer solution is coated and coated on the electrode active material layer, is degraded or structural rigidity is inhibited.
- FIG. 1 is a schematic cross-sectional view of an integrated electrode assembly according to an embodiment of the present invention.
- the integrated electrode assembly is an inorganic coating layer serving as a conventional separator that serves as a spacer for passing ions while preventing electrical contact between the anode and the cathode; and reversible lithium
- the electrode electrode
- An integrated electrode assembly that is integrated into one, more specifically, an inorganic coating layer comprising a positive electrode, a first binder polymer layer, a plurality of inorganic particles and a second binder polymer, An integrated electrode assembly is provided in which the three binder polymer layers and the cathode are sequentially laminated and bonded.
- FIG. 1 An integrated electrode assembly according to one embodiment of the present invention is schematically illustrated in FIG. 1.
- a cathode current collector 10 a cathode active material layer 20, a first binder polymer layer 30, an inorganic coating layer 40 including a plurality of inorganic particles and a second binder polymer, and a third binder
- the polymer layer 30 ', the negative electrode active material layer 20', and the negative electrode current collector 10 ' are sequentially stacked.
- the first binder polymer layer, the third binder polymer layer and the inorganic coating layer is coated on the entire lower layer (coated surface).
- the inorganic coating layer is formed by binding to each other by a second binder polymer or the like in a state in which a plurality of inorganic particles are filled and in contact with each other, thereby forming an 'interstitial volumes' structure between the inorganic particles
- the pore structure can be formed.
- Pore size and porosity of the inorganic coating layer is an important influence factor in the control of the ion conductivity.
- the pore size and porosity of the inorganic coating layer is preferably in the range of 0.01 to 10 ⁇ m and 20 to 75%, respectively.
- the thickness of the inorganic coating layer is not particularly limited, but may be adjusted in consideration of battery performance. In view of reducing the internal resistance of the battery, the inorganic coating layer preferably has a thickness in the range of 1 to 50 ⁇ m or in the range of 1 to 20 ⁇ m.
- the main constituents of the inorganic coating layer are inorganic particles and a second binder polymer, and the inorganic particles are not particularly limited as long as they can prevent a short circuit between the negative electrode and the positive electrode and are electrochemically stable. That is, the inorganic particles that can be used in the present invention are not particularly limited as long as the oxidation and / or reduction reactions do not occur in the operating voltage range of the battery to be applied (for example, 0 to 5 V on the basis of Li / Li + ). In particular, in the case of using the inorganic particles having the ion transfer ability, since the ion conductivity in the electrochemical device can be improved to improve the performance, it is preferable that the ion conductivity is as high as possible.
- the inorganic particles have a high density, it is not only difficult to disperse during coating, but also has a problem of weight increase during battery manufacturing, and therefore, the smallest density is desirable.
- the inorganic material having a high dielectric constant it is possible to improve the dissociation degree of the electrolyte salt such as lithium salt in the liquid electrolyte, thereby improving the ionic conductivity of the electrolyte solution.
- the inorganic particles are preferably inorganic particles having a dielectric constant of 5 or more, inorganic particles having a lithium ion transfer ability, or a mixture thereof.
- Non-limiting examples of inorganic particles having a dielectric constant of 5 or more include BaTiO 3 , SnO 2 , CeO 2 , MgO, Mg (OH) 2 , NiO, CaCO 3 , CaO, ZnO, ZrO 2 , Y 2 O 3 , SiO 2 , Al (OH) 3 , AlOOH, Al 2 O 3 , TiO 2, or a mixture thereof.
- the size of the inorganic particles is not limited, but is preferably in the range of 0.01 to 10 ⁇ m as much as possible in order to form a coating layer of uniform thickness and appropriate porosity. If it is less than 0.01 ⁇ m it is difficult to control the physical properties of the inorganic coating layer due to the increase in the specific surface area, and if it exceeds 10 ⁇ m it increases the thickness of the inorganic coating layer made of the same solid content decreases the mechanical properties, and also due to the excessively large pore size The possibility of internal short circuits increases during battery charging and discharging.
- the inorganic coating layer may be applied in an amount of 1 to 30 g / m 2 , it is possible to ensure the high temperature safety of the battery without significantly lowering the battery performance when used between the electrodes in the amount of the numerical range.
- Another major component constituting the inorganic coating layer is a binder polymer (second binder polymer).
- a binder polymer having a glass transition temperature (T g ) as low as possible can be used, preferably a binder polymer having a glass transition temperature in the range of -200 to 200 ° C. This is because the mechanical properties such as flexibility and elasticity of the inorganic coating layer can be improved.
- the second binder polymer serves to improve the adhesion between the inorganic particles and the adhesion between the inorganic coating layer and the electrode adhesive layer (ie, the first and / or third binder polymer layer).
- the second binder polymer does not necessarily have an ion conducting ability, but when the binder polymer having the ion conducting ability is used, the performance of the electrochemical device may be further improved. Therefore, it is preferable that the second binder polymer has as high a dielectric constant as possible.
- the second binder polymer may have a characteristic of exhibiting a high degree of swelling of the electrolyte by gelling when the liquid electrolyte is impregnated.
- Non-limiting examples of the second binder polymer usable in the present invention include polyethylene oxide, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene, polyvinylidene fluoride-trichloroethylene, polymethyl methacrylate, Polyacrylonitrile, polyacrylonitrile-styrene copolymer, polyvinylchloride (PVC), polyvinylpyrrolidone, polyvinylacetate, polyethylene vinyl acetate copolymer, gelatin, cyanoethyl pullulan, cyanoethyl polyvinyl Alcohols, cyanoethyl cellulose, cyanoethyl sucrose, pullulan, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, polyethylene glycol, glyme, polyethylene glycol dimethyl ether, carboxy methyl cellulose, or mixtures thereof. .
- the composition of the inorganic particles and the second binder polymer in the inorganic coating layer is not particularly limited, and can be adjusted according to the thickness and structure of the coating layer required. More specifically, it is preferable to adjust the composition ratio of the inorganic particles and the second binder polymer within the range of 10:90 to 99: 1 weight ratio, and the range of 50:50 to 98: 2 weight ratio is preferable.
- the composition ratio of the inorganic particles and the second binder polymer is less than 10:90 weight ratio, the content of the second binder polymer is excessively large, resulting in a decrease in pore size and porosity due to a decrease in the interstitial volume formed between the inorganic particles. Degradation can be caused.
- the first binder polymer layer and the third binder polymer layer are layers formed between the electrode active material layer and the inorganic coating layer in order to more effectively bond the electrode active material layer and the inorganic coating layer, and can be used for the first binder polymer layer and the third binder polymer layer.
- the binder polymer refers to the contents described in connection with the above-described second binder polymer.
- the first binder polymer layer and the third binder polymer layer may each independently have a thickness of 0.2 to 10 ⁇ m or 0.5 to 5 ⁇ m.
- the first binder polymer layer and the third binder polymer layer should have a thickness of 0.2 ⁇ m or more to effectively bond the inorganic coating layer to the electrode, and have a thickness of 5 ⁇ m or less to ensure proper air permeability in the electrode assembly while providing a compact battery. It can have a volume.
- the electrode that can be used in the present invention is not particularly limited and may be prepared in a form in which the electrode active material is bound to the current collector according to conventional methods known in the art.
- Non-limiting examples of the positive electrode active material of the electrode active material may be a conventional positive electrode active material that can be used for the positive electrode of the conventional electrochemical device, in particular lithium manganese oxide, lithium cobalt oxide, lithium nickel oxide, lithium iron oxide or combinations thereof It is preferable to use one lithium composite oxide.
- Non-limiting examples of the negative electrode active material may be a conventional negative electrode active material that can be used for the negative electrode of the conventional electrochemical device, in particular lithium metal or lithium alloys, carbon, petroleum coke, activated carbon, Lithium adsorption materials such as graphite or other carbons are preferable.
- Non-limiting examples of the positive electrode current collector is a foil made by aluminum, nickel or a combination thereof, and non-limiting examples of the negative electrode current collector by copper, gold, nickel or copper alloy or a combination thereof Foils produced.
- the first binder polymer solution is coated and dried on a release film to form a first binder polymer layer (step (S1)).
- the first binder polymer is dissolved in a solvent to prepare a first binder polymer solution.
- a solvent for the compound usable as the first binder polymer, see the above description.
- Non-limiting examples of solvents that can be used include acetone, tetrahydrofuran, methylene chloride, chloroform, dimethylformamide, N-methyl-2-pyrrolidone ( Nmethyl-2-pyrrolidone, NMP), cyclohexane, water, or a mixture thereof.
- the content of the first binder polymer in the first binder polymer solution may be used in an amount that does not block pores of the layers while showing excellent adhesion to the inorganic coating layer and the electrode active material layer, for example, based on 100 parts by weight of the inorganic coating layer To about 0.1 to about 10 parts by weight, preferably about 1 to about 6 parts by weight.
- the release film is a material that allows the binder polymer layer formed on one surface of the release film to be easily released afterwards, and may include any material.
- a polyester film such as polyethylene terephthalate, a polypropylene film, or the like may be used, and a silicone-containing compound may be applied by using a silicone-containing compound to further improve releasability.
- the silicon-containing compound may be represented by the following Chemical Formula 1:
- R 1 , R 2 , R 3 and R 4 are linear or branched alkyl, cycloalkyl, alkenyl, aryl, aralkyl, halogenated alkyl, halogenated aryl, halogenated aralkyl, phenyl, mercaptan, respectively.
- the alkyl is C 1 to C 18
- the cycloalkyl is C 3 to C 18
- the alkenyl is C 2 to C 18
- the aryl and the aralkyl are C Having 6 to C 18 carbon atoms
- n and m may be different or the same as each other, and are an integer of 1 to 100,000.
- the thickness of the release film is not particularly limited, but may be, for example, 0.5 to 30 ⁇ m or 1 to 15 ⁇ m.
- the method of coating the first binder polymer solution on a release film may use a conventional coating method known in the art, for example, dip coating, die coating, roll coating, comma ) Various methods such as coating or mixing method thereof can be used.
- a slurry including a plurality of inorganic particles and a second binder polymer is coated and dried to form an inorganic coating layer ((S2)).
- the second binder polymer is dissolved in a solvent to prepare a binder polymer solution or an emulsion, and then inorganic particles are added to the prepared second binder polymer solution or emulsion to disperse it.
- the dispersion time is suitably 1 to 20 hours, the particle size of the inorganic particles is preferably 0.01 to 10 ⁇ m as mentioned above.
- a dispersion method a conventional method can be used, and a ball mill method is especially preferable.
- the second binder polymer solution in which the inorganic particles are dispersed is coated on the first binder polymer layer and dried.
- a coating method usable refer to the coating method described above in connection with the first binder polymer solution in the step (S1).
- a third binder polymer solution is coated and dried on the inorganic coating layer to form a third binder polymer layer (step S3).
- step (S1) Perform with reference to the contents.
- the third binder polymer layer is laminated and laminated to contact the active material layer of the positive electrode or the negative electrode ((S4)).
- the present process may be performed, for example, by laminating a third binder polymer layer in contact with a cathode and then laminating at a constant temperature, for example, a temperature of 80 to 105 ° C.
- step S5 the release film attached to the first binder polymer layer is removed, and the first binder polymer layer is laminated and laminated so as to be in contact with the active material layer of the other electrode.
- the present process may be performed by, for example, removing the release film attached to the first binder polymer layer, laminating the surface on which the release film has been removed to contact the anode, and laminating at a constant temperature, for example, a temperature of 80 to 105 ° C. .
- the binder polymer layer of the present invention that is, the first binder polymer layer and the third binder polymer layer are laminated and laminated on the electrode in a dried state, so that the binder polymer solution does not contact the electrode. Will not. Therefore, the binder polymer solution is directly coated and coated on the electrode to flow into the electrode active material layer such that the structure of the electrode active material layer may be totally or partially degraded.
- an electrochemical device comprising the electrode assembly.
- the electrochemical device is preferably a lithium secondary battery, and the lithium secondary battery includes a lithium metal secondary battery, a lithium ion secondary battery, a lithium polymer secondary battery or a lithium ion polymer secondary battery.
- the polyvinylidene fluoride (PVdF) copolymer emulsion Arkema, RC, 10-280
- the fluorinated acrylic binder JSR TRD202A
- boehmite Nabaltec Actilox200SM
- carboxymethyl cellulose Gelchem SG-L02
- acrylic particles Toyo ink Co. CSB130 having an average diameter of 0.2 ⁇ m were 90: 5: Dispersing in water in a composition ratio of 5 to prepare a slurry for forming an inorganic coating layer.
- the third binder polymer solution was coated and dried to form a third binder polymer layer.
- the third binder polymer layer was laminated to contact the negative electrode active material layer, and then laminated at about 80 ° C. using a laminator.
- the polyethylene terephthalate film which is a release film attached to the first binder polymer layer, was removed, and the first binder polymer layer was laminated so as to be in contact with the positive electrode active material layer, followed by lamination at about 80 ° C.
- Example 2 As in Example 1, a slurry for preparing an inorganic coating layer was prepared.
- the slurry was coated on a negative electrode active material layer and dried to coat and dry an inorganic coating layer on the negative electrode active material layer. Subsequently, after the inorganic coating layer and the positive electrode active material layer were laminated so as to contact each other, the lamination was performed at 80 ° C. using a laminator.
- Example 1 The electrode assemblies prepared in Example 1 and Comparative Example 1 were pressed with a ball crusher, and a time point at which an internal short circuit occurred was confirmed.
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Abstract
Description
Claims (11)
- 양극, 제1 바인더 고분자층, 다수의 무기물 입자와 제2 바인더 고분자를 포함하여 이루어진 무기물 코팅층, 제3 바인더 고분자층 및 음극이 순차적으로 적층 결합되어 있는 일체형 전극조립체.
- 제1항에 있어서,상기 무기물 코팅층에 의해 양극과 음극의 내부 단락이 방지되는 것을 특징으로 하는 일체형 전극조립체.
- 제1항에 있어서,상기 무기물 코팅층을 구성하는 무기물 입자는 유전율 상수가 5 이상인 무기물 입자 또는 이들의 혼합체인 것을 특징으로 하는 일체형 전극조립체.
- 제3항에 있어서,상기 유전율 상수가 5 이상인 무기물 입자는 BaTiO3, SnO2, CeO2, MgO, Mg(OH)2, NiO, CaCO3, CaO, ZnO, ZrO2, Y2O3, SiO2, Al(OH)3, AlOOH, Al2O3 및 TiO2로 이루어진 군으로부터 선택된 1종 또는 2종 이상의 혼합물인 것을 특징으로 하는 일체형 전극조립체.
- 제1항에 있어서,상기 제1 바인더 고분자층과 제3 바인더 고분자층은 각각 독립적으로 0.2 내지 5.0㎛ 범위의 두께를 가지는 것을 특징으로 하는 일체형 전극조립체.
- 제1항에 있어서,상기 전극은 전류집전체, 및 상기 전류집전체의 적어도 일면에 형성된 전극활물질층을 포함하고,상기 전극활물질층에 제1 바인더 고분자층, 제2 바인더 고분자층 또는 이들 둘다가 접하는 것을 특징으로 하는 일체형 전극조립체.
- 제1항 내지 제6항중 어느 한 항에 기재된 전극조립체를 포함하는 전기화학소자.
- 제7항에 있어서,상기 전기화학소자가 리튬이차전지인 것을 특징으로 하는 전기화학소자.
- (S1) 제1 바인더 고분자 용액을 이형 필름(release film) 위에 코팅 및 건조시켜 제1 바인더 고분자층을 형성시키는 단계;(S2) 상기 제1 바인더 고분자층 위에, 다수의 무기물 입자와 제2 바인더 고분자를 포함하는 슬러리를 코팅 및 건조시켜 무기물 코팅층을 형성시키는 단계;(S3) 상기 무기물 코팅층 위에, 제3 바인더 용액을 코팅 및 건조시켜 제3 바인더 고분자 층을 형성시키는 단계;(S4) 상기 제3 바인더 고분자층이 전극 활물질층과 접하도록 적층시키고 라미네이션하는 단계; 및(S5) 제1 바인더 고분자층에 부착된 이형 필름을 제거하고, 상기 제1 바인더 고분자층이 다른 전극의 활물질층과 접하도록 적층시키고 라미네이션하는 단계;를 포함하는 일체형 전극조립체의 제조방법.
- (S1) 다수의 무기물 입자와 제2 바인더 고분자를 포함하는 슬러리를 이형 필름(release film) 위에 코팅 및 건조시켜 무기물 코팅층을 형성시키는 단계;(S2) 이형 필름을 제거하고 상기 무기물 코팅층 위에 제1 바인더 고분자 용액을 코팅 및 건조시켜 제1 바인더 고분자층을 형성시키는 단계;(S3) 제1 바인더 고분자층이 형성되지 않은 무기물 코팅층 면에 제3 바인더 고분자 용액을 코팅 및 건조시켜 제3 바인더 고분자층을 형성시키는 단계; 및(S4) 상기 제1 바인더 고분자층 및 제3 바인더 고분자층이 각각 전극 활물질층과 접하도록 적층시키고 라미네이션하는 단계;를 포함하는 세퍼레이터 일체형 전극조립체의 제조방법.
- 제10항에 있어서,상기 (S2) 및 (S3) 단계에서의 코팅이 딥 코팅 방식으로 동시에 수행되는 것을 특징으로 하는 세퍼레이터 일체형 전극조립체의 제조방법.
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PL3217462T3 (pl) | 2020-05-18 |
US10763492B2 (en) | 2020-09-01 |
JP6924795B2 (ja) | 2021-08-25 |
JP6533295B2 (ja) | 2019-06-19 |
JP2018508926A (ja) | 2018-03-29 |
CN107431165B (zh) | 2020-09-08 |
EP3217462A1 (en) | 2017-09-13 |
CN107431165A (zh) | 2017-12-01 |
KR101957406B1 (ko) | 2019-06-19 |
KR20160112266A (ko) | 2016-09-28 |
EP3217462B1 (en) | 2019-11-20 |
US20180166682A1 (en) | 2018-06-14 |
JP2019165013A (ja) | 2019-09-26 |
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