# US 12,191,472 B2 · Electrode structure and 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 12,191,472 B2 - Document ID: US12191472B2 - Status: Granted - Kind: B2 - Application number: 16/973,622 - Filed: 2019-02-22 - Published: 2021-08-12 - Granted: 2025-01-07 - Earliest claimed: 2018-06-28 - Assignees: Panasonic Intellectual Property Management Co., Ltd. - Applicants: Panasonic Intellectual Property Management Co., Ltd. - Inventors: Kazuhiro Yoshii - Web page: https://patentgrep.com/patent/US12191472B2 ## CPC - H01M 4/0435: {Rolling or calendering} - 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 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx - H01M 4/134: Electrodes based on metals, Si or alloys - 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 4/587: for inserting or intercalating light metals - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 10/0585: of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators - H01M 10/4235: {Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence)} - H01M 50/409: Separators, membranes or diaphragms characterised by the material - H01M 50/489: Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties - H01M 2004/027: {Negative electrodes} - H01M 2004/028: {Positive electrodes} - 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 non-aqueous electrolyte secondary battery according to one aspect of the present application comprises: a positive electrode; a negative electrode; a heat-resistant layer that is formed on at least one of the positive electrode and the negative electrode; and a non-aqueous electrolyte, wherein the heat-resistant layer includes heat-resistant particles, at least the surface of said heat-resistant particles comprising a metal compound, the average thickness of the heat-resistant layer is within the range 0.5 μm-5 μm, the porosity of the heat-resistant layer is 25%-55%, the average surface roughness (Ra) of the heat-resistant layer is 0.35 μm or less, and the electronegativity of metal ions of the metal compound is 13.5 or greater. ## Claims ### Claim 1 A non-aqueous electrolyte secondary battery comprising: a positive electrode; a negative electrode; a heat-resistant layer formed on at least any one of the positive electrode and the negative electrode; and a non-aqueous electrolyte; wherein the heat-resistant layer includes heat-resistant particles having at least a surface including a metal compound, the heat-resistant layer has an average thickness in the range of 0.5 μm to 5 μm, the heat-resistant layer has a porosity of 25% to 55%, the heat-resistant layer has an average surface roughness (Ra) of 0.35 μm or less, metal ions in the metal compound have an electronegativity of 13.5 or more, and a plurality of exposed portions in which an electrode located under the heat-resistant layer is partially exposed are present on a surface of the heat-resistant layer, and a maximum length for each of the exposed portions is 3 μm or more and 30 μm or less. ### Claim 2 (depends on 1) The non-aqueous electrolyte secondary battery according to claim 1, wherein the heat-resistant particles have an average particle size of 0.05 μm to 1 μm. ### Claim 3 (depends on 1) The non-aqueous electrolyte secondary battery according to claim 1, wherein the metal compound corresponds to an oxide, a hydroxide, or an oxyhydroxide including at least any one of Ti, Sn, W, Nb, Mo, and Si. ### Claim 4 (depends on 1) The non-aqueous electrolyte secondary battery according to claim 1, wherein the heat-resistant particles each correspond to an oxide, a hydroxide, or an oxyhydroxide including at least any one of Ti, Sn, W, Nb, Mo, and Si. ### Claim 5 (depends on 1) The non-aqueous electrolyte secondary battery according to claim 1, wherein the heat-resistant particles each have a polyhedron shape, a needle shape, or a necking shape. ### Claim 6 (depends on 1) The non-aqueous electrolyte secondary battery according to claim 1, wherein a sum of lengths of the exposed portions is 20% or less based on a length of an entire surface of the electrode, in any cross section of the electrode. ### Claim 7 (depends on 1) The non-aqueous electrolyte secondary battery according to claim 1, wherein the negative electrode comprises a negative electrode current collector and a negative electrode active material layer formed on the negative electrode current collector, wherein the heat-resistant layer is formed on an entire surface of the negative electrode active material layer. ### Claim 8 An electrode structure comprising: an electrode for use as a positive electrode or a negative electrode of a non-aqueous electrolyte secondary battery; and a heat-resistant layer formed on the electrode; wherein the heat-resistant layer includes heat-resistant particles having at least a surface including a metal compound, the heat-resistant layer has an average thickness in the range of 0.5 μm to 5 μm, the heat-resistant layer has a porosity of 25% to 55%, the heat-resistant layer has an average surface roughness (Ra) of 0.35 μm or less, metal ions in the metal compound have an electronegativity of 13.5 or more, and a plurality of exposed portions in which an electrode located under the heat-resistant layer is partially exposed are present on a surface of the heat-resistant layer, and a maximum length for each of the exposed portions is 3 μm or more and 30 μm or less. ### Claim 9 (depends on 1) The non-aqueous electrolyte secondary battery according to claim 1, wherein the metal compound corresponds to an oxide, a hydroxide, or an oxyhydroxide including at least any one of W, Nb and Mo. ### Claim 10 (depends on 8) The electrode structure according to claim 8, wherein the metal compound corresponds to an oxide, a hydroxide, or an oxyhydroxide including at least any one of W, Nb and Mo.