# US 12,218,342 B2 · Energy storage device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,218,342 B2 - Document ID: US12218342B2 - Status: Granted - Kind: B2 - Application number: 17/598,506 - Filed: 2020-03-23 - Published: 2022-06-16 - Granted: 2025-02-04 - Earliest claimed: 2019-03-29 - Assignees: GS Yuasa International Ltd. - Applicants: GS Yuasa International Ltd. - Inventors: Tomoya Tsuchikawa - Web page: https://patentgrep.com/patent/US12218342B2 ## CPC - H01M 4/364: {as mixtures} - H01G 11/24: characterised by structural features of the materials making up or comprised in the electrodes, e.g. form, surface area or porosity; characterised by the structural features of powders or particles used therefor - H01G 11/26: characterised by their structure, e.g. multi-layered, porosity or surface features - H01G 11/52: Separators - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 50/417: Polyolefins - H01M 50/431: Inorganic material - H01M 50/443: Particulate material - H01M 50/451: comprising layers of only organic material and layers containing inorganic 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 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 2004/021: {Physical characteristics, e.g. porosity, surface area} - Y02E 60/10: Energy storage using batteries - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract One aspect of the present invention is an energy storage device including: an electrode having a mixture layer containing active material particles; and a separator having an inorganic layer facing the mixture layer, the inorganic layer containing inorganic particles, in which the active material particles have two or more peaks in volume-based particle size distribution, and an average particle diameter of the inorganic particles is 1.2 μm or less. ## Claims ### Claim 1 An energy storage device comprising: an electrode having a mixture layer containing active material particles; and a separator having an inorganic layer facing the mixture layer, the inorganic layer containing inorganic particles, wherein the active material particles have two or more peaks in a volume-based particle size distribution, and an average particle diameter of the inorganic particles is 1.2 μm or less. ### Claim 2 (depends on 1) The energy storage device according to claim 1, wherein an aspect ratio of the inorganic particle is 7 or more. ### Claim 3 (depends on 1) The energy storage device according to claim 1, wherein the active material particles contain particles A and particles B having different mode diameters, a particle diameter ratio (A/B) that is the mode diameter of the particles A to the mode diameter of the particles B is 3 or more, and a content ratio (A/B) that is a content of the particles A to a content of the particles B is 4/6 or more. ### Claim 4 (depends on 1) The energy storage device according to claim 1, wherein a particle diameter (D10) at a cumulative degree of 10% of the active material particles is 3 μm or less, and a particle diameter (D90) at a cumulative degree of 90% is 10 μm or more. ### Claim 5 (depends on 1) The energy storage device according to claim 1, wherein a packing density of the mixture layer is 2.8 g/cm3 or more. ### Claim 6 (depends on 1) The energy storage device according to claim 1, wherein the packing density of the mixture layer is 3.2 g/cm3 or more. ### Claim 7 (depends on 1) The energy storage device according to claim 1, wherein the active material particles contain particles A and particles B having different mode diameters, a particle diameter ratio (A/B) that is the mode diameter of the particles A to the mode diameter of the particles B is 3 or more and 6 or less, and a content ratio (A/B) that is a content of the particles A to a content of the particles B is 4/6 or more and 8/2 or less. ### Claim 8 (depends on 1) The energy storage device according to claim 1, wherein the active material particles contain particles A and particles B having different mode diameters, a particle diameter ratio (A/B) that is the mode diameter of the particles A to the mode diameter of the particles B is 3 or more and 4.5 or less, and a content ratio (A/B) that is a content of the particles A to a content of the particles B is 4/6 or more and 7/3 or less. ### Claim 9 (depends on 1) The energy storage device according to claim 1, wherein the active material particles contain particles A and particles B having different mode diameters, a composition of the particles A and a composition of the particle B are the same. ### Claim 10 (depends on 1) The energy storage device according to claim 1, wherein the average particle diameter of the inorganic particles is 0.7 μm or more and 1.2 μm or less. ### Claim 11 (depends on 1) The energy storage device according to claim 1, wherein the electrode having the mixture layer containing the active material particles is a positive electrode having a positive electrode mixture layer containing positive active material particles, the inorganic layer is in direct contact with the positive electrode mixture layer. ### Claim 12 (depends on 1) The energy storage device according to claim 1, wherein the separator further has a porous resin film, the inorganic layer is provided on only one surface of the porous resin film, and the inorganic layer is in direct contact with the mixture layer.