# US 9,437,869 B2 · Positive electrode for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery using the positive electrode > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,437,869 B2 - Document ID: US9437869B2 - Status: Granted - Kind: B2 - Application number: 13/992,944 - Filed: 2011-09-21 - Published: 2013-11-14 - Granted: 2016-09-06 - Earliest claimed: 2010-12-20 - Assignees: Sanyo Electric Co., Ltd. - Applicants: Daizo Jito; Takeshi Ogasawara - Inventors: Daizo Jito; Takeshi Ogasawara - Web page: https://patentgrep.com/patent/US9437869B2 ## CPC - H01M 4/366: {as layered products} - H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx - H01M 4/364: {as mixtures} - 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 10/052: Li-accumulators - H01M 50/46: Separators, membranes or diaphragms characterised by their combination with electrodes - Y02E 60/10: Energy storage using batteries - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - Y02T 10/70: Energy storage systems for electromobility, e.g. 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 - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract It is an object of the present invention to provide a positive electrode for nonaqueous electrolyte secondary batteries that can suppress decreases in the discharge capacity and discharge voltage even when continuous charging is performed at high temperature and that can also suppress decreases in the discharge voltage and energy density even in the charge and discharge after the continuous charging, and to provide a nonaqueous electrolyte secondary battery that uses the positive electrode. The positive electrode includes a positive electrode active material composed of a mixture containing lithium cobalt oxide 21 having a surface to which an erbium compound 22 is partly adhered and lithium nickel cobalt manganese oxide and a binder. The content of the lithium nickel cobalt manganese oxide is 1% by mass or more and 50% by mass or less relative to the total amount of the positive electrode active material. ## Claims ### Claim 1 A positive electrode for nonaqueous electrolyte secondary batteries, comprising: a positive electrode active material composed of a mixture containing (i) lithium cobalt oxide particles having a surface to which rare-earth compound particles are partly adhered, and (ii) lithium nickel cobalt manganese oxide particles; and a binder, wherein the content of the lithium nickel cobalt manganese oxide is 1% by mass or more and 50% by mass or less relative to the total amount of the positive electrode active material, wherein the amount of the rare-earth compound particles adhered to the surface of the lithium cobalt oxide particles is 0.01% by mass or more and 0.5% by mass or less relative to the amount of the lithium oxide particles on a rare-earth element basis, wherein the rare-earth compound particles have an average particle size of 100 nm or less and 0.1 nm or more, and wherein the rare-earth compound particles are at least one selected from the group consisting of rare-earth hydroxides, rare-earth oxyhydroxides, and rare-earth carbonate compounds. ### Claim 2 (depends on 1) The positive electrode for nonaqueous electrolyte secondary batteries according to claim 1, wherein the content of the lithium nickel cobalt manganese oxide particles is 3% by mass or more and 30% by mass or less relative to the total amount of the positive electrode active material. ### Claim 3 (depends on 1) The positive electrode for nonaqueous electrolyte secondary batteries according to claim 1, wherein the content of the lithium nickel cobalt manganese oxide particles is 5% by mass or more and 20% by mass or less relative to the total amount of the positive electrode active material. ### Claim 4 (depends on 1) The positive electrode for nonaqueous electrolyte secondary batteries according to claim 1, wherein the lithium nickel cobalt manganese oxide particles have a surface to which rare-earth compound particles are partly adhered. ### Claim 5 (depends on 4) The positive electrode for nonaqueous electrolyte secondary batteries according to claim 4, wherein a rare-earth element of the rare-earth compound particles is at least one element selected from erbium, neodymium, samarium, and lanthanum. ### Claim 6 (depends on 1) The positive electrode for nonaqueous electrolyte secondary batteries according to claim 1, wherein a rare-earth element of the rare-earth compound particles is at least one element selected from erbium, neodymium, samarium, and lanthanum. ### Claim 7 (depends on 1) A nonaqueous electrolyte secondary battery, comprising: the positive electrode for nonaqueous electrolyte secondary batteries according to claim 1, a negative electrode containing a negative electrode active material, and a separator disposed between both the electrodes and impregnated with an electrolyte. ### Claim 8 (depends on 7) The nonaqueous electrolyte secondary battery according to claim 7, wherein an inorganic particle layer containing inorganic particles is formed between the separator and the positive electrode for nonaqueous electrolyte secondary batteries. ### Claim 9 (depends on 8) The nonaqueous electrolyte secondary battery according to claim 8, wherein the inorganic particle layer is formed on a surface of the positive electrode for nonaqueous electrolyte secondary batteries. ### Claim 10 (depends on 8) The nonaqueous electrolyte secondary battery according to claim 8, wherein an inorganic particle layer containing inorganic particles is formed between the separator and the negative electrode. ### Claim 11 (depends on 7) The nonaqueous electrolyte secondary battery according to claim 7, wherein an inorganic particle layer containing inorganic particles is formed between the separator and the negative electrode. ### Claim 12 (depends on 11) The nonaqueous electrolyte secondary battery according to claim 11, wherein the inorganic particle layer is formed on a surface of the negative electrode. ### Claim 13 (depends on 1) The positive electrode for nonaqueous electrolyte secondary batteries according to claim 1, wherein no rare-earth compound particle is adhered to any surface of the lithium nickel cobalt manganese oxide particles.