# US 2019/0173087 A1 · Electrode material for electricity storage devices, electrode for electricity storage devices, and electricity storage device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0173087 A1 - Document ID: US20190173087A1 - Status: Published application - Kind: A1 - Application number: 16/321,332 - Filed: 2017-08-29 - Published: 2019-06-06 - Earliest claimed: 2016-08-31 - Assignees: Sekisui Chemical Co., Ltd. - Applicants: Sekisui Chemical Co., Ltd. - Inventors: Yuuki Sawada; Hiroki Masuda; Akira Nakasuga; Akihiko Fujiwara; Takuya Wada - Web page: https://patentgrep.com/patent/US20190173087A1 ## CPC - H01M 4/625: {Carbon or graphite} - H01G 11/32: Carbon-based - H01G 11/36: Nanostructures, e.g. nanofibres, nanotubes or fullerenes - H01G 11/38: Carbon pastes or blends; Binders or additives therein - H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx - H01M 4/364: {as mixtures} - H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy - 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 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01G 11/34: characterised by carbonisation or activation of carbon - H01G 11/40: Fibres - H01G 11/86: specially adapted for electrodes (carbonisation or activation of carbon for the manufacture of electrodes H01G11/34) - H01M 2004/028: {Positive electrodes} - Y02E 60/10: Energy storage using batteries - Y02T 10/70: Energy storage systems for electromobility, e.g. 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 - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract There is provided an electrode material for electricity storage devices, which enables suppression of heat generation in charge and discharge at large currents. The electrode material for electricity storage devices comprises a first carbon material having a graphite structure wherein graphite is partially exfoliated, and a second carbon material different from the first carbon material, wherein the ratio A/B, where A represents a weight of the first carbon material and B represents a weight of the second carbon material, is within the range of 0.01 or higher and 100 or lower. ## Claims ### Claim 1 An electrode material for electricity storage devices, comprising: a first carbon material having a graphite structure wherein graphite is partially exfoliated; and a second carbon material different from the first carbon material, wherein a ratio A/B, where A represents a weight of the first carbon material and B represents a weight of the second carbon material, is within the range of 0.01 or higher and 100 or lower. ### Claim 2 (depends on 1) The electrode material for electricity storage devices according to claim 1, wherein the ratio A/B is within the range of 0.05 or higher and 20 or lower. ### Claim 3 (depends on 1) The electrode material for electricity storage devices according to claim 1, wherein the ratio A/B is within the range of 0.1 or higher and 10 or lower. ### Claim 4 (depends on 1) The electrode material for electricity storage devices according to claim 1, wherein a ratio y/x is 0.15 or higher where y represents an amount (μmol/g) of methylene blue adsorbed per g of the first carbon material measured based on a difference in absorbance between a methanol solution of methylene blue having a concentration of 10 mg/L and a supernatant liquid obtained by placing the first carbon material in the methanol solution of methylene blue and centrifuging the mixture, and x represents a BET specific surface area (m2/g) of the first carrion material. ### Claim 5 (depends on 1) The electrode material for electricity storage devices according to claim 1, wherein a ratio D/G, where the D/G ratio represents a peak intensity ratio between the D band in a Raman spectrum of the first carbon material and the G band therein, is within the range of 0.05 or higher and 0.8 or lower. ### Claim 6 (depends on 1) The electrode material for electricity storage devices according to claims 1, wherein the second carbon material is a grapherie, a granular graphite compound, a fibrous graphite compound, a carbon black or an active carbon. ### Claim 7 (depends on 1) The electrode material for electricity storage devices according to claim 1, wherein the electrode material further comprises a positive electrode active material, and is a composite of the positive electrode active material, the first carbon material and the second carbon material. ### Claim 8 (depends on 1) The electrode material for electricity storage devices according to claim 1, wherein when an X-ray diffraction spectrum of a mixture of the first carbon material and Si in a weight ratio of 1:1 is measured, a ratio cid between a height c of the highest peak in the range of 2θ of 24° or larger and smaller than 28° and a height d of the highest peak in the range of 2θ of 28° or larger and smaller than 30 is 0.2 or higher and 1.0 or lower. ### Claim 9 (depends on 1) The electrode material for electricity storage devices according to claim 1, wherein the first carbon material and the second carbon material are electroconductive auxiliary agents to be used for a positive electrode of an electricity storage device. ### Claim 10 (depends on 1) The electrode material for electricity storage devices according to claim 1, wherein a total content of the first carbon material and the second carbon material in the electrode material for electricity storage devices is 0.2% by weight or higher and 5% by weight or lower. ### Claim 11 (depends on 1) An electrode for electricity storage devices, comprising the electrode material for electricity storage devices according to claim 1. ### Claim 12 (depends on 11) An electricity storage device, comprising the electrode for electricity storage devices according to claim 11.