# US 12,119,445 B2 · Non-aqueous electrolyte secondary battery, electrolyte solution, and method for producing non-aqueous electrolyte secondary battery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,119,445 B2 - Document ID: US12119445B2 - Status: Granted - Kind: B2 - Application number: 16/966,147 - Filed: 2019-01-10 - Published: 2021-02-04 - Granted: 2024-10-15 - Earliest claimed: 2018-01-31 - Assignees: Panasonic Intellectual Property Management Co., Ltd. - Applicants: Panasonic Intellectual Property Management Co., Ltd. - Inventors: Chisaki Fujitomo; Satoshi Nishitani; Yasuko Nozaki; Masaki Deguchi - Web page: https://patentgrep.com/patent/US12119445B2 ## CPC - H01M 10/056: characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes - H01M 10/0567: characterised by the additives - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 10/0568: characterised by the solutes - H01M 10/0569: characterised by the solvents - H01M 10/058: Construction or manufacture - H01M 2300/0017: Non-aqueous electrolytes - 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 Disclosed is a non-aqueous electrolyte secondary battery including: a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and an electrolyte solution, wherein the electrolyte solution includes a solvent, a solute, and a carboxylic anhydride, the solvent includes a carboxylic acid ester compound, and the solute includes a sulfonyl imide compound. ## Claims ### Claim 1 A non-aqueous electrolyte secondary battery comprising: a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and an electrolyte solution, wherein the electrolyte solution includes a solvent, a solute, and a carboxylic anhydride, the solvent includes a carboxylic acid ester compound, the solute includes a sulfonyl imide compound, a proportion of the carboxylic acid ester compound in the solvent is 5 vol % to 20 vol %, the sulfonyl imide compound includes lithium bis(fluorosulfonyl)imide: LiN(SO2F)2, and the negative electrode includes a composite material including a lithium silicate phase and silicon particles dispersed in the lithium silicate phase. ### Claim 2 (depends on 1) The non-aqueous electrolyte secondary battery according to claim 1, wherein a content of the carboxylic anhydride in the electrolyte solution is 3 mass % or less. ### Claim 3 (depends on 1) The non-aqueous electrolyte secondary battery according to claim 1, wherein a content of the sulfonyl imide compound in the electrolyte solution is 0.1 mol/L to 1.1 mol/L. ### Claim 4 (depends on 1) The non-aqueous electrolyte secondary battery according to claim 1, wherein the carboxylic anhydride includes at least one selected from the group consisting of succinic anhydride, maleic anhydride, and a diglycolic anhydride. ### Claim 5 (depends on 1) The non-aqueous electrolyte secondary battery according to claim 1, wherein a content of the silicon particles in the composite material is 30 mass % or more. ### Claim 6 (depends on 1) The non-aqueous electrolyte secondary battery according to claim 1, wherein a composition of the lithium silicate phase is represented by the formula: LiySiOz, and satisfies 0