# US 12,224,437 B2 · Method of producing a secondary battery, and secondary battery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,224,437 B2 - Document ID: US12224437B2 - Status: Granted - Kind: B2 - Application number: 17/668,475 - Filed: 2022-02-10 - Published: 2022-10-27 - Granted: 2025-02-11 - Earliest claimed: 2021-04-27 - Assignees: Kabushiki Kaisha Toshiba - Applicants: Kabushiki Kaisha Toshiba - Inventors: Arisa Yamada; Tomoe Kusama; Tomoko Sugizaki; Yuta Kanai; Hirofumi Yasumiishi; Tetsuya Sasakawa; Yasuhiro Harada - Web page: https://patentgrep.com/patent/US12224437B2 ## CPC - 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 4/0471: {involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis} - H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx - H01M 4/134: Electrodes based on metals, Si or alloys - H01M 4/1391: of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx - H01M 4/1395: of electrodes based on metals, Si or alloys - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 2004/027: {Negative electrodes} - H01M 2004/028: {Positive electrodes} - H01M 2300/0037: Mixture of solvents - Y02E 60/10: Energy storage using batteries - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - 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 ## Abstract According to one embodiment, a method of producing a secondary battery is provided. The method includes preparing a battery architecture including a positive electrode, a negative electrode, and an electrolyte; adjusting a positive electrode potential to a range of 3.4 V to 3.9 V and a negative electrode potential to a range of 1.5 V to 2.0 V based on an oxidation-reduction potential of lithium, thereby providing a potential adjusted state; and holding the battery architecture in the potential adjusted state at a holding temperature of 50° C. to 90° C. The positive electrode includes a lithium-nickel-cobalt-manganese composite oxide. The negative electrode includes a niobium-titanium composite oxide. The electrolyte includes one or more first organic solvent having a viscosity of 1 cP or less. ## Claims ### Claim 1 A method of producing a secondary battery, the method comprising: preparing a battery architecture, the battery architecture comprising a positive electrode, a negative electrode, and an electrolyte, the positive electrode comprising a lithium-nickel-cobalt-manganese composite oxide, the negative electrode comprising a niobium-titanium composite oxide, and the electrolyte comprising one or more of first organic solvents having a viscosity of 1 cP or less; adjusting a positive electrode potential of the positive electrode to a range of 3.4 V or more and 3.9 V or less based on oxidation-reduction potential of lithium, and adjusting a negative electrode potential of the negative electrode to a range of 1.5 V or more and 2.0 V or less based on oxidation-reduction potential of lithium, thereby providing a potential adjusted state; and holding the battery architecture in the potential adjusted state at a holding temperature in a range of 50° C. or more and 90° C. or less. ### Claim 2 (depends on 1) The method of producing a secondary battery according to claim 1, wherein the battery architecture is held in the potential adjusted state at the holding temperature for 6 hours or more and 72 hours or less. ### Claim 3 (depends on 1) The method of producing a secondary battery according to claim 1, wherein the electrolyte comprises the first organic solvent in a volume ratio of 10% or more. ### Claim 4 (depends on 1) The method of producing a secondary battery according to claim 1, wherein the first organic solvent comprises one or more selected from the group consisting of diethyl carbonate, methyl ethyl carbonate, and ethyl propionate. ### Claim 5 (depends on 1) The method of producing a secondary battery according to claim 1, wherein the electrolyte comprises a second organic solvent comprising propylene carbonate. ### Claim 6 (depends on 1) The method of producing a secondary battery according to claim 1, wherein the electrolyte further comprises a sultone compound. ### Claim 7 (depends on 6) The method of producing a secondary battery according to claim 6, wherein the sultone compound comprises one or more selected from the group consisting of 1,3-propane sultone, 1,3-propene sultone, 1,4-butane sultone, and 2,4-butane sultone. ### Claim 8 (depends on 1) The method of producing a secondary battery according to claim 1, wherein the lithium-nickel-cobalt-manganese composite oxide comprises a compound represented by LixNi1−y−zCoyMnzO2 wherein 0