WO2023075485A1 - 리튬 이차전지용 양극의 제조 방법, 이를 이용하여 제조한 양극, 및 이를 포함하는 리튬 이차전지 - Google Patents
리튬 이차전지용 양극의 제조 방법, 이를 이용하여 제조한 양극, 및 이를 포함하는 리튬 이차전지 Download PDFInfo
- Publication number
- WO2023075485A1 WO2023075485A1 PCT/KR2022/016645 KR2022016645W WO2023075485A1 WO 2023075485 A1 WO2023075485 A1 WO 2023075485A1 KR 2022016645 W KR2022016645 W KR 2022016645W WO 2023075485 A1 WO2023075485 A1 WO 2023075485A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- positive electrode
- secondary battery
- active material
- lithium secondary
- material layer
- Prior art date
Links
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 48
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000003960 organic solvent Substances 0.000 claims abstract description 77
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000006182 cathode active material Substances 0.000 claims abstract description 32
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims abstract description 27
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims abstract description 23
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims abstract description 20
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 claims abstract description 20
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 18
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims abstract description 14
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000007774 positive electrode material Substances 0.000 claims description 59
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- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 16
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- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 15
- 239000000853 adhesive Substances 0.000 claims description 12
- 230000001070 adhesive effect Effects 0.000 claims description 12
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 claims description 11
- 229910052782 aluminium Inorganic materials 0.000 claims description 10
- 229910052759 nickel Inorganic materials 0.000 claims description 7
- 229910010707 LiFePO 4 Inorganic materials 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 229910052738 indium Inorganic materials 0.000 claims description 4
- 229910052717 sulfur Inorganic materials 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
- 229910052725 zinc Inorganic materials 0.000 claims description 4
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 3
- 229910052684 Cerium Inorganic materials 0.000 claims description 3
- 239000013078 crystal Substances 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 229910052758 niobium Inorganic materials 0.000 claims description 3
- 239000010450 olivine Substances 0.000 claims description 3
- 229910052609 olivine Inorganic materials 0.000 claims description 3
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 3
- 229910052720 vanadium Inorganic materials 0.000 claims description 3
- 229910052727 yttrium Inorganic materials 0.000 claims description 3
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- 238000001179 sorption measurement Methods 0.000 abstract description 10
- 239000010410 layer Substances 0.000 description 69
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- 239000000203 mixture Substances 0.000 description 20
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- -1 lithium transition metal Chemical class 0.000 description 17
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- 239000000463 material Substances 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 5
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- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 4
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 4
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- CKFRRHLHAJZIIN-UHFFFAOYSA-N cobalt lithium Chemical compound [Li].[Co] CKFRRHLHAJZIIN-UHFFFAOYSA-N 0.000 description 4
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- 239000010949 copper Substances 0.000 description 4
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 4
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- 150000002500 ions Chemical class 0.000 description 4
- 229910003002 lithium salt Inorganic materials 0.000 description 4
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- DURPTKYDGMDSBL-UHFFFAOYSA-N 1-butoxybutane Chemical compound CCCCOCCCC DURPTKYDGMDSBL-UHFFFAOYSA-N 0.000 description 2
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
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- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- KLARSDUHONHPRF-UHFFFAOYSA-N [Li].[Mn] Chemical compound [Li].[Mn] KLARSDUHONHPRF-UHFFFAOYSA-N 0.000 description 2
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- ACFSQHQYDZIPRL-UHFFFAOYSA-N lithium;bis(1,1,2,2,2-pentafluoroethylsulfonyl)azanide Chemical compound [Li+].FC(F)(F)C(F)(F)S(=O)(=O)[N-]S(=O)(=O)C(F)(F)C(F)(F)F ACFSQHQYDZIPRL-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
-
- 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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
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- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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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
- H01M4/04—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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- 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
- H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
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- 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
- H01M4/139—Processes of manufacture
- H01M4/1397—Processes of manufacture of electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
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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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
- H01M4/366—Composites as layered products
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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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
- H01M4/622—Binders being polymers
- H01M4/623—Binders being polymers fluorinated polymers
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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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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/028—Positive electrodes
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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
Definitions
- the present invention relates to a method for manufacturing a positive electrode for a lithium secondary battery including a lithium iron phosphate positive electrode active material, a positive electrode for a lithium secondary battery manufactured using the same, and a lithium secondary battery including the positive electrode.
- lithium transition metal composite oxide is used as a cathode active material of a lithium secondary battery, and among them, a lithium cobalt composite metal oxide having a high operating voltage and excellent capacity characteristics is mainly used.
- lithium cobalt composite metal oxide has low stability and is expensive, it is difficult to mass-produce lithium secondary batteries.
- lithium iron phosphate having an olivinic structure has a high volume density, generates a high potential, and has a high theoretical capacity of about 170 mAh/g.
- lithium iron phosphate in its initial state contains one electrochemically undopable Li for each Fe atom, it is a promising material as a cathode active material for lithium secondary batteries.
- lithium iron phosphate contains iron, which is a resource-rich and inexpensive material, it is cheaper and less toxic than the above-mentioned lithium cobalt composite metal oxide, lithium manganese composite metal oxide, or lithium nickel composite metal oxide. Therefore, it has the advantage of less pollution to the environment.
- lithium iron phosphate has a limitation in that lithium insertion/desorption rate is low during charge/discharge, and thus is manufactured with a smaller particle size than other positive electrode active materials.
- the particle size of the positive electrode active material is small, there is a problem in that the adhesive strength with the current collector is lowered, and the positive electrode active material layer may be detached due to mechanical shock applied to the electrode during the assembly process of the secondary battery.
- detachment of the cathode active material layer occurs, the capacity of the secondary battery actually measured compared to the design capacity is reduced, and there is a problem in that fine short circuit defects occur due to the detached particles.
- the electrode adhesion is improved by increasing the total binder content in the positive electrode active material layer, or the drying time is increased during electrode coating to mitigate binder migration, thereby mitigating the interface between the current collector and the active material layer.
- a technique for improving electrode adhesion by adjusting the binder content to be high has been known.
- the present invention manufactures a positive electrode for a lithium secondary battery capable of increasing electrode adhesion without increasing the content of a binder included in a positive electrode active material layer or increasing the drying time of the electrode when manufacturing a positive electrode including a lithium iron phosphate positive electrode active material having a small particle size. is to provide a way
- a positive electrode manufactured by the above manufacturing method and having excellent adhesion of an electrode active material layer to an electrode current collector, and a lithium secondary battery including the positive electrode.
- a method of manufacturing a positive electrode for a secondary battery according to an embodiment of the present invention includes preparing a positive electrode in which a positive electrode active material layer containing lithium iron phosphate is formed on a current collector; and adsorbing an organic solvent to the cathode active material layer.
- the organic solvent is a group consisting of N-methyl-2-pyrrolidone (NMP), dimethyl sulfoxide (DMSO), isopropyl alcohol, acetone and ethanol It may include one or more selected from.
- the organic solvent is dimethylcarbonate (DMC), diethylcarbonate (DEC), methylethylcarbonate (MEC), ethylmethylcarbonate (EMC), ethylene It may include at least one selected from the group consisting of ethylene carbonate (EC) and propylene carbonate (PC).
- DMC dimethylcarbonate
- DEC diethylcarbonate
- MEC methylethylcarbonate
- EMC ethylmethylcarbonate
- ethylene may include at least one selected from the group consisting of ethylene carbonate (EC) and propylene carbonate (PC).
- the lithium iron phosphate may be a compound represented by Formula 1 below.
- M includes any one or two or more elements selected from the group consisting of Al, Mg, Ni, Co, Mn, Ti, Ga, Cu, V, Nb, Zr, Ce, In, Zn and Y
- X includes any one or two or more elements selected from the group consisting of F, S, and N, and a, b, and x are each -0.5 ⁇ a ⁇ 0.5, 0 ⁇ b ⁇ 0.1, 0 ⁇ x ⁇ is 0.5)
- the lithium iron phosphate may be LiFePO 4 having an olivine crystal structure.
- the average particle diameter (D 50 ) of the lithium iron phosphate may be 0.5 to 3 ⁇ m.
- the positive electrode active material layer may further include a binder.
- the binder may be at least one selected from the group consisting of polyvinylidene fluoride (PVDF), styrene-butadiene rubber (SBR), and carboxymethyl cellulose (CMC).
- PVDF polyvinylidene fluoride
- SBR styrene-butadiene rubber
- CMC carboxymethyl cellulose
- the binder content may be 5% by weight or less with respect to the total weight of the positive electrode active material layer.
- the step of adsorbing the organic solvent to the positive electrode active material layer may include a process of directly spraying the organic solvent onto the positive electrode or sealing the positive electrode together with the organic solvent in an airtight container and adsorbing the organic solvent.
- the organic solvent may be adsorbed in an amount of 2,000 to 20,000 ppm based on the total weight of the positive electrode active material layer.
- a positive electrode according to an embodiment of the present invention includes a positive electrode current collector and a positive electrode active material layer formed on at least one surface of the positive electrode current collector and containing lithium iron phosphate, wherein the positive electrode active material layer comprises the entire positive electrode active material layer. 2,000 to 20,000 ppm organic solvent by weight.
- the electrode adhesive strength measured by a 90° peel test between the positive electrode active material layer and the current collector may be 10 gf/2 cm or more.
- the positive electrode active material layer may directly contact the positive electrode current collector.
- the lithium iron phosphate may have an average particle diameter (D 50 ) of 0.5 to 3 ⁇ m.
- a lithium secondary battery according to the present invention includes the positive electrode.
- the positive electrode manufactured according to the present invention since the adhesive strength between the electrode active material layer and the electrode current collector is high, there is an effect of suppressing defects such as capacity reduction and micro short circuits caused by active material detachment occurring during the secondary battery assembly process. .
- the organic solvent molecules are positioned at the contact interface between the current collector and the active material layer, so that the adhesive force is increased by forming attraction between atoms/molecules. Let it be.
- the positive electrode according to the present invention exhibits sufficient electrode adhesion without increasing the content of the binder, resistance characteristics of the secondary battery and flexibility of the electrode are improved. Furthermore, since sufficient electrode adhesion is exhibited without increasing the drying time during manufacture of the cathode, the manufacturing cost and manufacturing time of the secondary battery can be reduced.
- the 'particle size Dn' of the positive electrode active material means the particle size at the n% point of the cumulative volume distribution according to the particle size. That is, D50 is the particle size at the 50% point of the volume cumulative distribution according to the particle size, D90 is the particle size at the 90% point of the volume cumulative distribution according to the particle size, and D10 is the particle size at the 10% point of the volume cumulative distribution according to the particle size. is the mouth size
- the Dn can be measured using a laser diffraction method. Specifically, after dispersing the powder to be measured in a dispersion medium, it is introduced into a commercially available laser diffraction particle size measuring device (e.g.
- Microtrac S3500 to measure the difference in diffraction pattern according to the particle size when the particles pass through the laser beam to distribute the particle size.
- yields D10, D50, and D90 can be measured by calculating the particle diameter at the point where it becomes 10%, 50%, and 90% of the volume cumulative distribution according to the particle diameter in the measuring device.
- a method of manufacturing a cathode for a lithium secondary battery of the present invention includes preparing a cathode in which a cathode active material layer containing lithium iron phosphate is formed on a current collector; and adsorbing an organic solvent to the cathode active material layer.
- a composition for forming a positive electrode active material layer containing a lithium iron phosphate-based positive electrode active material is coated on at least one surface of a positive electrode current collector, and then dried to form a positive electrode active material layer.
- An anode formed on the whole can be prepared.
- composition for forming the cathode active material layer may be prepared by mixing or dispersing the cathode active material in a solvent.
- the cathode active material may specifically include lithium iron phosphate having a composition represented by Chemical Formula 1 below, and more specifically, may include LiFePO 4 having an olivine crystal structure.
- lithium iron phosphate having a composition represented by Chemical Formula 1 below, and more specifically, may include LiFePO 4 having an olivine crystal structure.
- M includes any one or two or more elements selected from the group consisting of Al, Mg, Ni, Co, Mn, Ti, Ga, Cu, V, Nb, Zr, Ce, In, Zn, and Y
- X contains any one or two or more elements selected from the group consisting of F, S and N, and is -0.5 ⁇ a ⁇ 0.5, 0 ⁇ b ⁇ 0.1, 0 ⁇ x ⁇ 0.5
- the inventors of the present invention found that the adhesive strength of the positive electrode dramatically increased by adding a step of adsorbing an organic solvent to the positive electrode active material layer, have led to the present invention.
- the type of the organic solvent is not particularly limited as long as it is an organic solvent capable of forming an attractive force with the binder, the positive electrode active material, and the current collector included in the positive electrode active material layer.
- the organic solvent is preferably an organic solvent used for a slurry for a positive electrode or an organic solvent used for an electrolyte solution of a lithium secondary battery.
- organic solvent used in the positive electrode slurry examples include N-methyl-2-pyrrolidone (NMP), dimethyl sulfoxide (DMSO), isopropyl alcohol, acetone and ethanol. It may include one or more selected from.
- the organic solvent used in the electrolyte of the lithium secondary battery is a non-aqueous organic solvent that serves as a medium for the movement of ions related to the electrochemical reaction of the battery
- organic solvents include methyl acetate and ethyl ester solvents such as ethyl acetate, ⁇ -butyrolactone, and ⁇ -caprolactone; ether solvents such as dibutyl ether or tetrahydrofuran; ketone solvents such as cyclohexanone; aromatic hydrocarbon-based solvents such as benzene and fluorobenzene; Dimethylcarbonate (DMC), diethylcarbonate (DEC), methylethylcarbonate (MEC), ethylmethylcarbonate (EMC), ethylene carbonate (EC), propylene carbonate , PC) and other carbonate-based solvents; alcohol solvents such as ethyl alcohol and isopropyl alcohol; nitriles such as R-CN (DMC),
- the average particle diameter (D 50 ) of the cathode active material is 0.5 to 3 ⁇ m, preferably 0.5 to 2.7 ⁇ m, more preferably can be adjusted to 0.6 to 2.5 ⁇ m.
- composition for forming the cathode active material layer may further include a binder in addition to the cathode active material.
- the binder serves to improve adhesion between particles of the positive electrode active material and adhesion between the positive electrode active material and the positive current collector.
- Specific examples include polyvinylidene fluoride (PVDF), polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene polymer (EPDM), sulfonated-EPDM, styrene-butadiene rubber, fluororubber, or various copolymers thereof, and the like, one alone or a mixture of two or more of these can be used
- PVDF polyvinylidene fluoride
- PVDF polyvinylidene fluoride
- the binder may be included in an amount of 5% by weight or less, preferably 1 to 5% by weight, and more preferably 2 to 3.5% by weight based on the total weight of the solid content in the composition for forming a positive electrode active material layer.
- the content of the binder is less than the above range, there is a problem in that electrode adhesiveness is too low, and when the content of the binder is above the above range, there is a problem that the resistance of the secondary battery is too high.
- composition for forming the positive electrode active material layer of the present invention may further include one or more additives such as a conductive material, a filler, or a dispersant.
- the conductive material is used to improve the conductivity of the electrode, and any material that does not cause chemical change in the secondary battery and has electronic conductivity can be used without particular limitation.
- Specific examples include, for example, carbon powder such as carbon black, acetylene black, ketjen black, channel black, furnace black, lamp black, or thermal black; graphite powder such as natural graphite, artificial graphite, or graphite; conductive fibers such as carbon fibers, carbon nanotubes, and metal fibers; Fluorinated carbon powder; conductive powders such as aluminum powder and nickel powder; conductive whiskers such as zinc oxide and potassium titanate; conductive metal oxides such as titanium oxide; and conductive materials such as polyphenylene derivatives, and the like, and one of them alone or a mixture of two or more may be used.
- the conductive material may be typically included in an amount of 0.3 to 5% by weight, preferably 0.3 to 4% by weight, and more preferably 0.5 to 3.5% by weight based on the total weight of the solid content in the composition for forming a positive electrode active material layer.
- the dispersant is for improving the dispersibility of the lithium iron phosphate-based cathode active material, and is not limited as long as it is a commonly used dispersant, and for example, an aqueous dispersant or an organic dispersant may be used.
- hydrogenated nitrile butadiene rubber HNBR
- HNBR hydrogenated nitrile butadiene rubber
- NBR nitrile butadiene rubber
- the dispersant may be included in an amount of 0 to 4% by weight, preferably 0 to 2% by weight, and more preferably 0.10 to 1.3% by weight based on the total weight of the solid content in the composition for forming a positive electrode active material layer.
- the positive electrode current collector is not particularly limited as long as it has conductivity without causing chemical change in the battery, and for example, stainless steel, aluminum, nickel, titanium, fired carbon, or aluminum or stainless steel. A steel surface treated with carbon, nickel, titanium, silver, or the like may be used.
- the cathode current collector may have a thickness of 8 to 20 ⁇ m, and fine irregularities may be formed on the surface of the cathode current collector to increase adhesion to the cathode active material layer.
- it may be used in various forms such as films, sheets, foils, nets, porous materials, foams, and non-woven fabrics.
- the process of applying the composition for forming a positive electrode active material layer to the positive electrode current collector may be performed by a method commonly known in the art, but uniformly using a doctor blade or the like. Distributed or die cast. It can be performed through methods such as comma coating and screen printing.
- drying the composition for forming a cathode active material layer applied on the cathode current collector may be performed according to a conventional drying method, for example, vacuum heat treatment in the above temperature range, Alternatively, it may be performed by a heat treatment method such as hot air injection.
- the temperature of the drying process may be 60 °C to 130 °C, specifically 80 °C to 130 °C, more specifically 100 °C to 130 °C.
- the moisture content in lithium iron phosphate can be minimized, and volatile components included in the process are sufficiently removed, so that side reactions caused by these components during charging and discharging of the battery occur and deterioration of battery characteristics can prevent
- the drying process time may be 5 minutes to 3 hours, specifically 5 minutes to 20 minutes, more specifically 5 minutes to 10 minutes. In the case of the manufacturing method according to the present invention, the drying process time can be shortened to the above range.
- the manufacturing method according to the present invention may include adsorbing an organic solvent to the cathode active material layer.
- the organic solvent is a material that is well adsorbed with the active material, the binder, and the current collector, and the organic solvent molecules are positioned at the contact interface between the current collector and the active material layer to increase electrode adhesion by forming atomic/molecular attraction.
- the organic solvent may be an organic solvent used for a cathode slurry, specifically N-methyl-2-pyrrolidone (NMP), dimethyl sulfoxide (DMSO), It may include at least one selected from the group consisting of isopropyl alcohol, acetone, and ethanol.
- NMP N-methyl-2-pyrrolidone
- DMSO dimethyl sulfoxide
- the organic solvent may be an organic solvent constituting the electrolyte of a lithium secondary battery, specifically dimethylcarbonate (DMC), diethylcarbonate (DEC), methylethyl It may include at least one selected from the group consisting of carbonate (methylethylcarbonate, MEC), ethylmethylcarbonate (EMC), ethylene carbonate (ethylene carbonate, EC) and propylene carbonate (PC).
- DMC dimethylcarbonate
- DEC diethylcarbonate
- EMC ethylmethylcarbonate
- EMC ethylmethylcarbonate
- ethylene carbonate ethylene carbonate
- EC propylene carbonate
- PC propylene carbonate
- the organic solvent to be adsorbed on the positive electrode active material layer when the same organic solvent is selected as the component of the electrolyte solution of the secondary battery, there is an advantage in that a drying process of drying the organic solvent after the adsorption step of the organic solvent can be omitted. .
- the organic solvent may be adsorbed in an amount of 2,000 to 20,000 ppm, preferably 2,000 to 10,000 ppm, and more preferably 2,000 to 4,000 ppm, based on the total weight of the positive electrode active material layer.
- the adsorption amount is lower than the above range, the effect of improving adhesion is limited, and when the adsorption amount is high, there is a disadvantage in that the adhesion with the separator is lowered.
- the step of adsorbing the organic solvent onto the positive electrode active material layer may be performed by directly spraying the organic solvent onto the positive electrode or by sealing the positive electrode together with the organic solvent in an airtight container and adsorbing the organic solvent.
- the organic solvent When the organic solvent is sprayed through a spray nozzle, it may be sprayed in an amount of 0.01 to 2 mg/cm 2 , preferably 0.01 to 1 mg/cm 2 , and more preferably 0.05 to 0.5 mg/cm 2 . In the case of spraying at the above spraying amount, an appropriate amount of organic solvent may be adsorbed onto the cathode active material layer.
- the positive electrode may be aged in a dry room environment at room temperature so that the entire amount of the organic solvent applied to the surface is absorbed and impregnated into the electrode.
- the Petri dish containing the organic solvent and the cathode may be placed in an airtight container, sealed, and stored for several days so that the organic solvent volatilized in the airtight container is adsorbed onto the cathode active material layer.
- the organic solvent may go through a process of drying.
- the organic solvent adsorbed on the positive electrode is the same as the electrolyte component, the organic solvent adsorbed on the positive electrode can serve as a medium for the movement of lithium ions, and thus the drying process can be omitted.
- the positive electrode manufactured according to the manufacturing method of the present invention contains an organic solvent in the positive electrode active material layer as it undergoes the step of adsorbing the organic solvent.
- the content of the organic solvent included in the positive electrode active material layer is 2,000 to 20,000 ppm with respect to the total weight of the positive electrode active material layer.
- the adsorption amount of the organic solvent was measured three times with Headspace Gas Chromatography with flame ionization detection (HS-GC-FID) equipment for the anode specimen cut to a certain size, and the average value was calculated can be defined as a single value.
- HS-GC-FID Headspace Gas Chromatography with flame ionization detection
- the organic solvent is an organic solvent used in a positive electrode slurry, such as NMP
- the content of the organic solvent is preferably 2,000 to 12,000 ppm, 2,500 to 10,000 ppm, or 3,000 to 9,000 ppm.
- the content of the organic solvent may be 2,000 to 20,000 ppm, preferably 3,000 to 15,000 ppm, and more preferably 4,000 to 12,000 ppm.
- the positive electrode according to an embodiment of the present invention has a structure in which the positive electrode active material layer directly contacts the positive electrode current collector, and does not include a separate layer for improving adhesion between the positive electrode active material layer and the positive electrode current collector.
- the positive electrode according to the present invention contains the organic solvent in the positive electrode active material layer, and the organic solvent forms an attractive force between the positive electrode active material and the current collector, thereby forming an attractive force between the positive electrode active material layer and the positive electrode current collector. It has the effect of improving the adhesive force between the contact interfaces between the whole. Therefore, the positive electrode of the present invention does not include a separate layer such as a binding layer or an adhesive layer or a bonding layer or a primer coating layer that may be interposed between the positive electrode current collector and the positive electrode active material layer to improve adhesion, 90 ° peel
- the electrode adhesive strength measured by the test is 10 gf/2cm or more, preferably 15 gf/2cm or more, thereby exhibiting excellent adhesive strength.
- the positive electrode of the present invention can improve the capacity and output characteristics of the battery due to the increased adhesion and reduce defects occurring in the manufacturing process.
- the present invention provides a lithium secondary battery including the positive electrode described above.
- the lithium secondary battery includes a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte, and the positive electrode is as described above.
- a composition for forming a negative electrode including a negative electrode active material and optionally additives such as a binder, a conductive material, a filler, and a dispersant is prepared on a negative electrode current collector, and then the composition is placed on the negative electrode current collector. It can be prepared by coating.
- the negative electrode active material is not particularly limited, and a compound capable of reversible intercalation and deintercalation of lithium may be used.
- a compound capable of reversible intercalation and deintercalation of lithium may be used.
- Specific examples include carbonaceous materials such as artificial graphite, natural graphite, graphitized carbon fiber, amorphous carbon, and highly crystalline carbon; metallic compounds capable of being alloyed with lithium, such as Si, Al, Sn, Pb, Zn, Bi, In, Mg, Ga, Cd, Si alloys, Sn alloys, or Al alloys; or a composite containing a metallic compound and a carbonaceous material.
- soft carbon and hard carbon may be used as the low crystalline carbon
- natural graphite, kish graphite, pyrolytic carbon, and liquid crystals may be used as the high crystalline carbon
- high-temperature calcined carbon such as mesophase pitch based carbon fiber, meso-carbon microbeads, mesophase pitches and petroleum or coal tar pitch derived cokes. .
- mesophase pitch based carbon fiber meso-carbon microbeads, mesophase pitches and petroleum or coal tar pitch derived cokes.
- mesophase pitch based carbon fiber meso-carbon microbeads, mesophase pitches and petroleum or coal tar pitch derived cokes.
- mesophase pitch based carbon fiber meso-carbon microbeads
- mesophase pitches and petroleum or coal tar pitch derived cokes.
- a metal lithium thin film may be used as the negative electrode active material.
- additives such as the binder, the conductive material, the filler, and the dispersant may be the same as those described in the positive electrode.
- the anode current collector is not particularly limited as long as it does not cause chemical change in the battery and has high conductivity.
- copper, stainless steel, aluminum, nickel, titanium, fired carbon, copper or stainless steel A surface treated with carbon, nickel, titanium, silver, or the like, an aluminum-cadmium alloy, or the like may be used.
- the negative electrode current collector may have a thickness of typically 3 to 500 ⁇ m, and like the positive electrode current collector, fine irregularities may be formed on the surface of the negative electrode current collector to enhance bonding strength of the negative electrode active material.
- it may be used in various forms such as films, sheets, foils, nets, porous materials, foams, and non-woven fabrics.
- a porous polymer film for example, a porous polymer film made of polyolefin-based polymers such as ethylene homopolymer, propylene homopolymer, ethylene/butene copolymer, ethylene/hexene copolymer, and ethylene/methacrylate copolymer, or these A laminated structure of two or more layers of may be used.
- the separator may be a porous thin film having a pore diameter of 0.01 ⁇ m to 10 ⁇ m and a thickness of 5 ⁇ m to 300 ⁇ m.
- the electrolyte may include an organic solvent and a lithium salt commonly used in electrolytes, but is not particularly limited.
- the organic solvent may be used without particular limitation as long as it can serve as a medium through which ions involved in the electrochemical reaction of the battery can move.
- the organic solvent includes ester solvents such as methyl acetate, ethyl acetate, ⁇ -butyrolactone, and ⁇ -caprolactone; ether solvents such as dibutyl ether or tetrahydrofuran; ketone solvents such as cyclohexanone; aromatic hydrocarbon-based solvents such as benzene and fluorobenzene; Dimethylcarbonate (DMC), diethylcarbonate (DEC), methylethylcarbonate (MEC), ethylmethylcarbonate (EMC), ethylene carbonate (EC), propylene carbonate , PC) and the like may be used.
- ester solvents such as methyl acetate, ethyl acetate, ⁇ -butyrolactone, and ⁇ -caprolactone
- ether solvents such as dibuty
- carbonate-based solvents are preferred, and cyclic carbonates (eg, ethylene carbonate or propylene carbonate, etc.) having high ion conductivity and high dielectric constant capable of increasing the charge and discharge performance of batteries, and low-viscosity linear carbonate-based compounds ( For example, a mixture of ethyl methyl carbonate, dimethyl carbonate or diethyl carbonate) is more preferable.
- cyclic carbonates eg, ethylene carbonate or propylene carbonate, etc.
- low-viscosity linear carbonate-based compounds For example, a mixture of ethyl methyl carbonate, dimethyl carbonate or diethyl carbonate is more preferable.
- the lithium salt any compound capable of providing lithium ions used in a lithium secondary battery may be used without particular limitation.
- the lithium salt is LiPF 6 , LiClO 4 , LiAsF 6 , LiBF 4 , LiSbF 6 , LiAlO 4 , LiAlCl 4 , LiCF 3 SO 3 , LiC 4 F 9 SO 3 , LiN(C 2 F 5 SO 3 ) 2 , LiN(C 2 F 5 SO 2 ) 2 , LiN(CF 3 SO 2 ) 2 .
- LiCl, LiI, or LiB(C 2 O 4 ) 2 or the like may be used.
- the lithium salt is preferably included in the electrolyte in a concentration of about 0.6 mol% to about 2 mol%.
- electrolyte in addition to the above electrolyte components, for example, pyridine, triethylphosphite, triethanolamine, cyclic ether, ethylene diamine, n -glyme, hexaphosphoric acid triamide, nitrobenzene derivative, sulfur, quinone imine dye, N-substituted oxazolidinone, N,N-substituted imidazolidine, ethylene glycol dialkyl ether, ammonium salt, pyrrole, 2 -
- One or more additives such as methoxy ethanol or aluminum trichloride may be further included. In this case, the additive may be included in an amount of 0.1 to 5% by weight based on the total weight of the electrolyte.
- the lithium secondary battery of the present invention may be manufactured by disposing a separator between a positive electrode and a negative electrode to form an electrode assembly, inserting the electrode assembly into a cylindrical battery case or a prismatic battery case, and then injecting an electrolyte.
- a separator between a positive electrode and a negative electrode to form an electrode assembly
- inserting the electrode assembly into a cylindrical battery case or a prismatic battery case and then injecting an electrolyte.
- they may be impregnated with an electrolyte, and the resulting product may be put into a battery case and sealed.
- NMP N-methyl-2-pyrrolidone
- acetone ethanol
- propylene carbonate ethylmethyl carbonate
- ethylene carbonate dimethyl carbonate used in manufacturing a positive electrode by drying the electrode assembly
- One or more organic solvents selected from the group consisting of may be removed.
- the process of drying the electrode assembly may be omitted.
- the battery case may be one commonly used in the field, and there is no limitation on the external appearance according to the purpose of the battery, for example, a cylindrical shape using a can, a prismatic shape, a pouch shape, or a coin shape. etc.
- the lithium secondary battery according to the present invention stably exhibits excellent discharge capacity, output characteristics, and capacity retention rate, it is suitable for portable devices such as mobile phones, notebook computers, digital cameras, and hybrid electric vehicles (HEVs). It is useful in the field of electric vehicles, etc.
- a LiFePO 4 cathode active material having an average particle diameter (D 50 ) of 2 ⁇ m, a carbon nanotube conductive material, a polyvinylidene fluoride (PVDF) binder, and a hydrogenated nitrile rubber (HNBR) dispersant were mixed at a weight ratio of 95.4 in N-methylpyrrolidone solvent.
- a propylene carbonate (PC) solvent was sprayed with a spray nozzle in an amount of 0.1 mg/cm 2 on the surface of the cathode active material layer of the prepared cathode to be uniformly applied.
- the positive electrode was aged for 15 minutes in a room temperature dry room environment so that the entire amount of propylene carbonate (PC) applied to the surface was absorbed and impregnated into the electrode.
- the PC adsorption amount for the entire active material layer was 4,000 ppm.
- a positive electrode was prepared in the same manner as in Example 1, except that acetone was used as the coating solvent.
- a LiFePO 4 cathode active material having an average particle diameter (D 50 ) of 2 ⁇ m, a carbon nanotube conductive material, a polyvinylidene fluoride (PVDF) binder, and a hydrogenated nitrile rubber (HNBR) dispersant were mixed at a weight ratio of 95.4 in N-methylpyrrolidone solvent.
- a positive electrode was prepared in the same manner as in Example 3, except that the prepared positive electrode and the Petri dish containing the N-methylpyrrolidone (NMP) solvent were placed in an airtight container, sealed, and stored for 5 days.
- NMP N-methylpyrrolidone
- a positive electrode was prepared in the same manner as in Example 1, except that dimethyl carbonate was used as the coating solvent.
- a LiFePO 4 cathode active material having an average particle diameter (D 50 ) of 2 ⁇ m, a carbon nanotube conductive material, a polyvinylidene fluoride (PVDF) binder, and a hydrogenated nitrile rubber (HNBR) dispersant were mixed at a weight ratio of 95.4 in N-methylpyrrolidone solvent. : 0.8: 3.0: 0.8 mixture (solid content: 60% by weight) to prepare a composition for forming a cathode, uniformly so that the thickness of the cathode active material layer in the final anode prepared on a 15 ⁇ m thick aluminum thin film is 96 ⁇ m coating to prepare a positive electrode. In order to lower the moisture content of the prepared positive electrode, vacuum drying was performed at 130° C. for 10 hours.
- the entire positive electrode active material layer was 160 ppm for
- a positive electrode was prepared in the same manner as in Example 1, except that distilled water was used as the coating solvent.
- the positive electrode of Comparative Example 1 was prepared in a size of 50 mm ⁇ 50 mm, and the adsorption amount of water was measured three times with a Karl fischer titration moisture meter (Metrohm Co.), and the average value was calculated to be 9500 ppm for the entire positive electrode active material layer.
- Adhesion between the positive electrode active material layer and the positive electrode current collector was compared with the positive electrodes prepared in Examples 1 to 5 and Comparative Examples 1 to 2.
- the positive electrodes prepared in Examples 1 to 5 and Comparative Examples 1 to 2 were cut to a size of 150 mm in length and 20 mm in width, and the surface of the electrode was 75 mm in length and 25 mm in width. Attached using That is, the slide glass was attached to an area corresponding to half of the lengthwise direction of the anode. Then, an evaluation sample was prepared by rubbing a roller with a load of 2 kg 10 times so that the double-sided tape was uniformly attached. The slide glass portion of the evaluation sample was fixed to the sample stage of a Universal Testing Machine (UTM) (LF Plus, manufactured by LLOYD), and the positive half portion to which the slide glass was not attached was connected to the load cell of the UTM device.
- UTM Universal Testing Machine
- the load applied to the load cell was measured while moving the load cell up to 50 mm at a speed of 100 mm/min. At this time, the minimum value of the load measured in the 20 mm to 40 mm section of the driving section was measured as the electrode adhesive force (gf / 2 cm) of each sample. After a total of 5 evaluations for each positive electrode, the average values are shown in Table 1 below.
- the positive electrodes of Examples 1 to 5 showed significantly higher adhesion than the positive electrodes of Comparative Examples 1 to 2.
- the organic solvent was not adsorbed on the positive electrode active material layer, so it could be confirmed that the electrode adhesiveness was inferior.
- the distilled water of Comparative Example 2 has a low intermolecular attraction with the PVDF binder, which is a relatively low polarity binder, it is interpreted that the electrode adhesive force effect is low.
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Abstract
Description
도포 용매 | 활물질층 대비 용매 도포량 | 전극 접착력(gf/2cm) | |
실시예 1 | PC | 4000 ppm | 20 |
실시예 2 | 아세톤 | 4000 ppm | 16 |
실시예 3 | NMP | 2600 ppm | 15 |
실시예 4 | NMP | 8600 ppm | 22 |
실시예 5 | 다이메틸카보네이트 | 4000 ppm | 24 |
비교예 1 | - | 160 ppm NMP | 7 |
비교예 2 | H2O | 9500 ppm | 6 |
Claims (16)
- 리튬철 인산화물을 포함하는 양극 활물질층이 집전체 상에 형성된 양극을 준비하는 단계; 및상기 양극 활물질층에 유기 용매를 흡착시키는 단계;를 포함하는 리튬 이차전지용 양극의 제조 방법.
- 제1항에 있어서, 상기 유기 용매는, N-메틸-2-피롤리돈(NMP), 디메틸셀폭사이드(dimethyl sulfoxide,DMSO), 이소프로필 알코올(isopropyl alcohol), 아세톤 및 에탄올로 이루어진 군에서 선택되는 하나 이상을 포함하는 것인 리튬 이차전지용 양극의 제조방법.
- 제1항에 있어서, 상기 유기 용매는, 다이메틸카보네이트(dimethylcarbonate, DMC), 다이에틸카보네이트(diethylcarbonate, DEC), 메틸에틸카보네이트(methylethylcarbonate, MEC), 에틸메틸카보네이트(ethylmethylcarbonate, EMC), 에틸렌카보네이트(ethylene carbonate, EC) 및 프로필렌카보네이트(propylene carbonate, PC)로 이루어진 군에서 선택되는 하나 이상을 포함하는 것인 리튬 이차전지용 양극의 제조 방법.
- 제1항에 있어서,상기 리튬철 인산화물은 하기 화학식 1의 화합물인 리튬 이차전지용 양극의 제조 방법.[화학식 1]Li1+aFe1-xMx(PO4-b)Xb(상기 식에서, M은 Al, Mg, Ni, Co, Mn, Ti, Ga, Cu, V, Nb, Zr, Ce, In, Zn 및 Y 로 이루어진 군에서 선택되는 어느 하나 또는 둘 이상의 원소를 포함하고, X는 F, S 및 N 로 이루어진 군에서 선택되는 어느 하나 또는 둘 이상의 원소를 포함하며, 그리고, a, b, x는 각각 -0.5≤a≤0.5, 0≤b≤0.1, 0≤x≤0.5이다)
- 제1항에 있어서,상기 리튬철 인산화물은 올리빈 결정 구조의 LiFePO4인 리튬 이차전지용 양극의 제조 방법.
- 제1항에 있어서,상기 리튬철 인산화물의 평균 입경(D50)이 0.5 내지 3 ㎛인 리튬 이차전지용 양극의 제조 방법.
- 제1항에 있어서,상기 양극활물질층은 바인더를 더 포함하는 것인 리튬 이차전지용 양극의 제조방법.
- 제7항에 있어서,상기 바인더는 폴리비닐리덴플루오라이드(PVDF), 스티렌-부타디엔 고무(SBR) 및 카르복시메틸셀룰로우즈(CMC)로 이루어지는 군으로부터 선택되는 하나 이상인 리튬 이차전지용 양극의 제조방법.
- 제1항에 있어서,양극 활물질층 전체 중량에 대하여 바인더 함량이 5중량% 이하인 리튬 이차전지용 양극의 제조방법.
- 제1항에 있어서,상기 양극 활물질층에 유기 용매를 흡착시키는 단계는 양극에 유기 용매를 직접 스프레이 분사하거나 양극을 밀폐용기 내에 유기 용매와 함께 밀봉하여 흡착시키는 것인 리튬 이차전지용 양극의 제조방법.
- 제1항에 있어서,상기 유기 용매를 양극 활물질층 전체 중량에 대해 2,000 내지 20,000 ppm의 비율로 흡착시키는 리튬 이차전지용 양극의 제조방법.
- 양극 집전체 및 상기 양극 집전체의 적어도 일면에 형성되고, 리튬철 인산화물을 포함하는 양극 활물질층을 포함하고,상기 양극 활물질층은, 양극 활물질층 전체 중량에 대해 2,000 내지 20,000 ppm의 유기 용매를 포함하는 리튬 이차전지용 양극.
- 제12항에 있어서, 상기 양극 활물질층과 집전체 사이의 90°peel test로 측정되는 전극 접착력이 10 gf/2cm 이상인 리튬 이차전지용 양극.
- 제12항에 있어서,상기 양극 활물질층은, 상기 양극 집전체와 직접 접촉하는 리튬 이차전지용 양극.
- 제12항에 있어서,상기 리튬철 인산화물은 평균 입경(D50)이 0.5 내지 3 ㎛인 리튬 이차전지용 양극.
- 제12항에 따른 양극을 포함하는 리튬 이차전지.
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CN202280012184.6A CN116830295A (zh) | 2021-10-29 | 2022-10-28 | 制造用于锂二次电池的阴极的方法、使用其制造的阴极、和包括该阴极的锂二次电池 |
EP22887680.1A EP4270537A1 (en) | 2021-10-29 | 2022-10-28 | Method for manufacturing cathode for lithium secondary battery, cathode manufactured using same, and lithium secondary battery comprising same |
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- 2022-10-28 EP EP22887680.1A patent/EP4270537A1/en active Pending
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