# US 2025/0210644 A1 · Positive electrode active material for nonaqueous electrolyte secondary batteries > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0210644 A1 - Document ID: US20250210644A1 - Status: Published application - Kind: A1 - Application number: 18/848,650 - Filed: 2023-01-27 - Published: 2025-06-26 - Earliest claimed: 2022-03-31 - Assignees: Panasonic Intellectual Property Management Co., Ltd. - Applicants: Panasonic Intellectual Property Management Co., Ltd. - Inventors: Shogo Esaki; Motoharu Saito; Mitsuhiro Hibino; Kensuke Nakura; Junko Matsushita - Web page: https://patentgrep.com/patent/US20250210644A1 ## CPC - H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy - H01M 10/052: Li-accumulators - C01G 45/1228: of the type (MnO2)-, e.g. LiMnO2 or Li(MxMn1-x)O2 - H01M 4/0404: {by coating on electrode collectors} - H01M 4/1315: containing halogen atoms, e.g. LiCoOxFy - H01M 4/13915: containing halogen atoms, e.g. LiCoOxFy - H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)} - H01M 10/0569: characterised by the solvents - C01P 2002/52: containing elements as dopants - C01P 2002/54: one element only - C01P 2002/72: by d-values or two theta-values, e.g. as X-ray diagram - C01P 2002/76: by a space-group or by other symmetry indications - C01P 2006/40: Electric properties - H01M 2004/021: {Physical characteristics, e.g. porosity, surface area} - H01M 2004/028: {Positive electrodes} - H01M 2300/0034: Fluorinated solvents - H01M 2300/0037: Mixture of solvents - Y02E 60/10: Energy storage using batteries - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - C01G: COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts or peroxyacids C01B15/00; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium, or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds containing nitrogen, other non-metals and metal C01B21/082}; metal amides C01B21/092; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanamide C01C3/16; thiocyanates C01C3/20) - C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract A positive electrode active material for nonaqueous electrolyte secondary batteries according to the present invention is a composite oxide which is represented by general formula LixTMtmMyO2-fFf and has a crystal structure that belongs to the space group Fm-3m; and in the general formula, TM represents a transition metal, M represents a non-transition metal, and if Q=2×tm×(1−(1−f/2)5), Q≥1 is satisfied. With respect to a dV/dq-SOC curve showing the relationship between the state of charge SOC and dV/dq of a half cell that contains this composite oxide, the dV/dq-SOC curve being obtained by charging the half cell with a charging current of 0.1 C at 25° C. to an end voltage within the range of 4.7 V to 4.95 V, there is one or more peaks within the SOC range from 40% to 70%. ## Claims ### Claim 1 A positive electrode active material for a non-aqueous electrolyte secondary battery, wherein the positive electrode active material is a composite oxide that has a crystal structure belonging to a space group Fm-3m and is represented by a general formula: LixTMtmMyO2-fFf, in the general formula, TM represents a transition metal, M represents a non-transition metal, and when Q=2×tm×{1−(1−f/2)5}, Q≥1 is satisfied, and when the composite oxide is used for a half-cell manufactured by the following method, one or more peaks in an SOC range of greater than or equal to 40% and less than or equal to 70% appear in a dV/dq-SOC curve showing a relationship between a state of charge SOC of the half-cell and dV/dq, which is a ratio of a change amount dV of a voltage V of the half-cell to a change amount dq of a battery capacity q of the half-cell, the dV/dq-SOC curve being obtained by charging the half-cell with a charging current of 0.1 C at 25° C. to an end voltage in a range of greater than or equal to 4.7 V and less than or equal to 4.95 V, (Method: A slurry for a positive electrode mixture layer is prepared by mixing the composite oxide, acetylene black, and polyvinylidene fluoride at a mass ratio of 7:2:1, and the mixture is dispersed using N-methyl-2-pyrrolidone. The slurry for a positive electrode mixture layer is applied to an aluminum foil, dried, and then rolled so that a film thickness is in a range of greater than or equal to 20 μm and less than or equal to 50 μm. Thereafter, punching is performed into a size of 20 mm×20 mm to obtain a positive electrode. An electrode assembly in which a separator is interposed between the positive electrode and a metal lithium foil (thickness: 0.3 mm) as a negative electrode is housed in an outer body of an aluminum laminate film, and a non-aqueous electrolyte in which LiPF6 is dissolved in a mixed solvent of fluoroethylene carbonate and methyl propionate (volume ratio: 1:3) so that a concentration thereof is 1 mol/liter is injected into the outer body and sealed to form a half-cell). ### Claim 2 (depends on 1) The positive electrode active material for a non-aqueous electrolyte secondary battery according to claim 1, wherein a discharge capacity of the half-cell is greater than or equal to 100 mAh/g measured when the half-cell is subjected to constant current charge to a range of an end voltage of greater than or equal to 4.7 V and less than or equal to 4.95 V with a charging current of 0.1 C at 25° C., subjected to constant voltage charge to a current value of 0.05 C at the end voltage, and then discharged to an end voltage of greater than or equal to 3.0 V and less than or equal to 3.5 V with a discharging current of 0.1 C. ### Claim 3 (depends on 1) The positive electrode active material for a non-aqueous electrolyte secondary battery according to claim 1, wherein a discharge capacity of the half-cell is greater than or equal to 200 mAh/g measured when the half-cell is subjected to constant current charge to a range of an end voltage of greater than or equal to 4.7 V and less than or equal to 4.95 V with a charging current of 0.1 C at 25° C., subjected to constant voltage charge to a current value of 0.05 C at the end voltage, and then discharged to an end voltage of greater than or equal to 2.5 V and less than or equal to 3.0 V with a discharging current of 0.1 C. ### Claim 4 (depends on 1) The positive electrode active material for a non-aqueous electrolyte secondary battery according to claim 1, wherein in the general formula, x, tm, y, and f satisfy 1.75≤x+tm+y≤2 and 0