# US 10,873,085 B2 · Positive electrode for lithium ion secondary battery and lithium ion secondary battery using the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,873,085 B2 - Document ID: US10873085B2 - Status: Granted - Kind: B2 - Application number: 15/591,426 - Filed: 2017-05-10 - Published: 2017-11-16 - Granted: 2020-12-22 - Earliest claimed: 2014-11-18 - Assignees: Murata Manufacturing Co., Ltd. - Applicants: Murata Manufacturing Co., Ltd. - Inventors: Toru Kawai; Masanori Morishita - Web page: https://patentgrep.com/patent/US10873085B2 ## CPC - H01M 4/621: {Binders} - H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof - H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx - H01M 4/485: of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) - H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy - H01M 4/525: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy - H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers - H01M 4/625: {Carbon or graphite} - H01M 4/626: {Metals} - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 10/0566: Liquid materials - H01M 2004/021: {Physical characteristics, e.g. porosity, surface area} - H01M 2004/028: {Positive electrodes} - H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane - Y02E 60/10: Energy storage using batteries - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract A positive electrode for a lithium ion secondary battery that includes a positive electrode combination material having a positive electrode active material that produces a potential of 4.5 V or higher on the basis of metal lithium; a conduction aid; and a binder. The binder contains an aqueous binder as its main constituent, and the sum SE of the surface area SA of the positive electrode active material in the positive electrode combination material and the surface area SC of the conduction aid therein is 90 to 400 cm2/cm2 per unit coated area of the positive electrode combination material. ## Claims ### Claim 1 A positive electrode combination material comprising: a positive electrode active material that produces a potential of 4.5 V or higher on the basis of metal lithium; a conduction aid; and a binder containing an aqueous binder as its main constituent, wherein a sum SE of a surface area SA of the positive electrode active material and a surface area SC of the conduction aid is 90 to 400 cm2/cm2 per unit coated area of the positive electrode combination material. ### Claim 2 (depends on 1) The positive electrode combination material according to claim 1, wherein the aqueous binder comprises a substance having a carboxyl group. ### Claim 3 (depends on 1) The positive electrode combination material according to claim 1, wherein the aqueous binder comprises at least one selected from a copolymer comprising a carboxymethyl cellulose, a polyacrylic acid, an acrylic acid, a metal salt or ammonium salt thereof. ### Claim 4 (depends on 1) The positive electrode combination material according to claim 1, wherein the sum SE is 150 to 300 cm2/cm2 per unit coated area of the positive electrode combination material. ### Claim 5 (depends on 1) The positive electrode combination material according to claim 1, wherein the conduction aid is selected from carbon black, non-graphitizable carbon, vapor-grown carbon fibers, carbon tubes, graphite, graphitizable carbon, graphene, and metal powders. ### Claim 6 (depends on 1) The positive electrode combination material according to claim 1, wherein the conduction aid comprises non-graphitizable carbon. ### Claim 7 (depends on 1) The positive electrode combination material according to claim 1, wherein the positive electrode active material is selected from spinel-type lithium-manganese oxides, inverse-spinel type lithium-vanadium oxides, and polyanion compounds. ### Claim 8 (depends on 1) The positive electrode combination material according to claim 1, wherein the positive electrode active material is a spinel-type lithium-nickel-manganese oxide having a composition formula of Li1+a[Mn2−a−x−yNixMy]O4, wherein 0≤a≤0.2, 0.4≤x≤0.6, 0≤y≤0.3, and M is at least one metal element containing Ti. ### Claim 9 (depends on 1) The positive electrode combination material according to claim 1, wherein the aqueous binder comprises a substance having a carboxyl group, the conduction aid comprises non-graphitizable carbon, and the positive electrode active material is a spinel-type lithium-nickel-manganese oxide having a composition formula of Li1+a[Mn2−a−x−yNixMy]O4, where 0≤a≤0.2, 0.4≤x≤0.6, 0≤y≤0.3, and M is at least one metal element containing Ti. ### Claim 10 (depends on 1) A lithium ion secondary battery comprising: a positive electrode containing the positive electrode combination material according to claim 1; a negative electrode; and a non-aqueous electrolytic solution. ### Claim 11 (depends on 10) The lithium ion secondary battery according to claim 10, wherein the aqueous binder comprises a substance having a carboxyl group. ### Claim 12 (depends on 10) The lithium ion secondary battery according to claim 10, wherein the aqueous binder comprises at least one selected from a copolymer comprising a carboxymethyl cellulose, a polyacrylic acid, an acrylic acid, a metal salt or ammonium salt thereof. ### Claim 13 (depends on 10) The lithium ion secondary battery according to claim 10, wherein the sum SE is 150 to 300 cm2/cm2 per unit coated area of the positive electrode combination material. ### Claim 14 (depends on 10) The lithium ion secondary battery according to claim 10, wherein the conduction aid is selected from carbon black, non-graphitizable carbon, vapor-grown carbon fibers, carbon tubes, graphite, graphitizable carbon, graphene, and metal powders. ### Claim 15 (depends on 10) The lithium ion secondary battery according to claim 10, wherein the conduction aid comprises non-graphitizable carbon. ### Claim 16 (depends on 10) The lithium ion secondary battery according to claim 10, wherein the positive electrode active material is selected from spinel-type lithium-manganese oxides, inverse-spinel type lithium-vanadium oxides, and polyanion compounds. ### Claim 17 (depends on 10) The lithium ion secondary battery according to claim 10, wherein the positive electrode active material is a spinel-type lithium-nickel-manganese oxide having a composition formula of Li1+a[Mn2−a−x−yNixMy]O4, wherein 0≤a≤0.2, 0.4≤x≤0.6, 0≤y≤0.3, and M is at least one metal element containing Ti. ### Claim 18 (depends on 10) The lithium ion secondary battery according to claim 10, wherein the aqueous binder comprises a substance having a carboxyl group, the conduction aid comprises non-graphitizable carbon, and the positive electrode active material is a spinel-type lithium-nickel-manganese oxide having a composition formula of Li1+a[Mn2−a−x−yNixMy]O4, where 0≤a≤0.2, 0.4≤x≤0.6, 0≤y≤0.3, and M is at least one metal element containing Ti.