# US 10,483,044 B2 · Material for electrode of power storage device, power storage device, and electrical appliance > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,483,044 B2 - Document ID: US10483044B2 - Status: Granted - Kind: B2 - Application number: 15/685,726 - Filed: 2017-08-24 - Published: 2018-01-04 - Granted: 2019-11-19 - Earliest claimed: 2012-10-09 - Assignees: Semiconductor Energy Laboratory Co., Ltd. - Applicants: Semiconductor Energy Laboratory Co., Ltd. - Inventors: Nobuhiro Inoue; Ryota Tajima; Tamae Moriwaka; Junpei Momo; Teppei Oguni; Kai Kimura; Kazutaka Kuriki; Shunpei Yamazaki - Web page: https://patentgrep.com/patent/US10483044B2 ## CPC - H01G 9/042: characterised by the material (H01G11/22 takes precedence) - H01G 11/06: with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC] - H01G 11/26: characterised by their structure, e.g. multi-layered, porosity or surface features - H01G 11/50: specially adapted for lithium-ion capacitors, e.g. for lithium-doping or for intercalation - H01M 4/02: Electrodes composed of, or comprising, active material - 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 4/366: {as layered products} - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - Y02E 60/10: Energy storage using batteries - Y02E 60/13: Energy storage using capacitors - 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) - 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 To improve the reliability of a power storage device. A granular active material including carbon is used, and a net-like structure is formed on part of a surface of the granular active material. In the net-like structure, a carbon atom included in the granular active material is bonded to a silicon atom or a metal atom through an oxygen atom. Formation of the net-like structure suppresses reductive decomposition of an electrolyte solution, leading to a reduction in irreversible capacity. A power storage device using the above active material has high cycle performance and high reliability. ## Claims ### Claim 1 A material for an electrode of a power storage device comprising: a granular active material comprising a carbon atom; and a film having a structure over the granular active material, wherein the structure comprises a plurality of bonds between the carbon atom and one of a silicon atom and a metal atom through an oxygen atom, and wherein the film partly covers a surface of the granular active material so that the surface of the granular active material has a first region which is covered with the film, and a second region which is not covered with the film. ### Claim 2 (depends on 1) The material for an electrode of a power storage device according to claim 1, wherein the granular active material comprises a graphite particle. ### Claim 3 (depends on 1) The material for an electrode of a power storage device according to claim 1, wherein the metal atom is one of a niobium atom, a titanium atom, a vanadium atom, a tantalum atom, a tungsten atom, a zirconium atom, a molybdenum atom, a hafnium atom, a chromium atom, and an aluminum atom. ### Claim 4 (depends on 1) The material for an electrode of a power storage device according to claim 1, further comprising a plurality of oxide layers over the film, wherein each of the plurality of oxide layers comprises a bond of the one of the silicon atom and the metal atom, and an oxygen atom. ### Claim 5 (depends on 1) A power storage device comprising a negative electrode, the negative electrode comprising the material for an electrode of a power storage device according to claim 1. ### Claim 6 (depends on 5) An electrical appliance comprising the power storage device according to claim 5. ### Claim 7 A material for an electrode of a power storage device comprising: a granular active material comprising a carbon atom; and a film having a structure over the granular active material, wherein the structure comprises a plurality of bonds between the carbon atom and a silicon atom through an oxygen atom, and wherein the film partly covers a surface of the granular active material so that the surface of the granular active material has a first region which is covered with the film, and a second region which is not covered with the film. ### Claim 8 (depends on 7) The material for an electrode of a power storage device according to claim 7, wherein the granular active material comprises a graphite particle. ### Claim 9 (depends on 7) The material for an electrode of a power storage device according to claim 7, further comprising a plurality of oxide layers over the film, wherein each of the plurality of oxide layers comprises a bond of the silicon atom and an oxygen atom. ### Claim 10 (depends on 7) A power storage device comprising a negative electrode, the negative electrode comprising the material for an electrode of a power storage device according to claim 7. ### Claim 11 (depends on 10) An electrical appliance comprising the power storage device according to claim 10. ### Claim 12 A material for an electrode of a power storage device comprising: a granular active material comprising a carbon atom; and a film having a structure over the granular active material, wherein the structure comprises a plurality of bonds between the carbon atom and one of a silicon atom and a metal atom through an oxygen atom, wherein the granular active material comprises a plurality of graphene layers, wherein the film partly covers a surface of the granular active material so that the surface of the granular active material has a first region which is covered with the film, and a second region which is not covered with the film, and wherein the structure exists at end portions of part of the plurality of graphene layers. ### Claim 13 (depends on 12) The material for an electrode of a power storage device according to claim 12, wherein the metal atom is one of a niobium atom, a titanium atom, a vanadium atom, a tantalum atom, a tungsten atom, a zirconium atom, a molybdenum atom, a hafnium atom, a chromium atom, and an aluminum atom. ### Claim 14 (depends on 12) The material for an electrode of a power storage device according to claim 12, further comprising a plurality of oxide layers over the film, wherein each of the plurality of oxide layers comprises a bond of the one of the silicon atom and the metal atom, and an oxygen atom. ### Claim 15 (depends on 12) A power storage device comprising a negative electrode, the negative electrode comprising the material for an electrode of a power storage device according to claim 12. ### Claim 16 (depends on 15) An electrical appliance comprising the power storage device according to claim 15.