# US 2017/0288256 A1 · Method of manufacturing positive electrode active material for lithium ion battery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0288256 A1 - Document ID: US20170288256A1 - Status: Published application - Kind: A1 - Application number: 15/622,995 - Filed: 2017-06-14 - Published: 2017-10-05 - Earliest claimed: 2011-08-29 - Assignees: Semiconductor Energy Laboratory Co., Ltd. - Applicants: Semiconductor Energy Laboratory Co., Ltd. - Inventors: Takuya MIWA; Kuniharu NOMOTO; Nobuhiro INOUE - Web page: https://patentgrep.com/patent/US20170288256A1 ## CPC - H01G 9/042: characterised by the material (H01G11/22 takes precedence) - H01M 4/5825: {Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines} - H01M 4/625: {Carbon or graphite} - H01M 10/058: Construction or manufacture - B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites - H01M 4/622: {being polymers} - Y02E 60/10: Energy storage using batteries - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - Y10T 29/49115: including coating or impregnating - 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 - B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES - 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 - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract At least one of an aqueous solution A containing lithium, an aqueous solution B containing iron, manganese, cobalt, or nickel, and an aqueous solution C containing a phosphoric acid includes graphene oxide. The aqueous solution A is dripped into the aqueous solution C, so that a mixed solution E including a precipitate D is prepared. The mixed solution E is dripped into the aqueous solution B, so that a mixed solution G including a precipitate F is prepared. The mixed solution G is subjected to heat treatment in a pressurized atmosphere, so that a mixed solution H is prepared, and the mixed solution H is then filtered. Thus, particles of a compound containing lithium and oxygen which have a small size are obtained. ## Claims ### Claim 1 (canceled) ### Claim 2 A method of manufacturing an active material particle, comprising the steps of: preparing a first mixed solution by mixing a first aqueous solution comprising lithium into a second aqueous solution; preparing a second mixed solution by mixing the first mixed solution and a third aqueous solution; and obtaining a particle of a compound comprising lithium, a metal and oxygen by mixing the first mixed solution and the third aqueous solution, wherein at least one of the first aqueous solution, the second aqueous solution, and the third aqueous solution comprises graphene oxide, and wherein one of the first aqueous solution, the second aqueous solution, and the third aqueous solution comprises the metal. ### Claim 3 (depends on 2) The method of manufacturing an active material particle according to claim 2, wherein the metal is one of iron, manganese, cobalt and nickel. ### Claim 4 (depends on 2) The method of manufacturing an active material particle according to claim 2, wherein the third aqueous solution comprises the metal. ### Claim 5 (depends on 2) The method of manufacturing an active material particle according to claim 2, wherein the particle is obtained by subjecting the second mixed solution to a heat treatment in a pressurized atmosphere, and wherein the pressurized atmosphere is an atmosphere of 0.1 MPa to 4.0 MPa. ### Claim 6 (depends on 2) The method of manufacturing an active material particle according to claim 2, further comprising the step of: performing a heat treatment of the particle. ### Claim 7 (depends on 5) The method of manufacturing an active material particle according to claim 5, wherein the heat treatment is drying. ### Claim 8 (depends on 2) The method of manufacturing an active material particle according to claim 2, wherein the particle comprises the graphene oxide. ### Claim 9 A method of manufacturing an active material particle, comprising the steps of: preparing a first mixed solution by mixing a first aqueous solution comprising lithium into a second aqueous solution; preparing a second mixed solution by mixing the first mixed solution and a third aqueous solution; and obtaining a particle of a compound comprising lithium, a metal and oxygen by mixing the first mixed solution and the third aqueous solution, wherein each of the first mixed solution and the second mixed solution comprises graphene oxide, and wherein one of the first aqueous solution, the second aqueous solution, and the third aqueous solution comprises the metal. ### Claim 10 (depends on 9) The method of manufacturing an active material particle according to claim 9, wherein the metal is one of iron, manganese, cobalt and nickel. ### Claim 11 (depends on 9) The method of manufacturing an active material particle according to claim 9, wherein the third aqueous solution comprises the metal. ### Claim 12 (depends on 9) The method of manufacturing an active material particle according to claims 9, wherein the particle is obtained by subjecting the second mixed solution to a heat treatment in a pressurized atmosphere, and wherein the pressurized atmosphere is an atmosphere of 0.1 MPa to 4.0 MPa. ### Claim 13 (depends on 9) The method of manufacturing an active material particle according to claim 9, further comprising the step of: performing a heat treatment of the particle. ### Claim 14 (depends on 12) The method of manufacturing an active material particle according to claim 12, wherein the heat treatment is drying. ### Claim 15 (depends on 9) The method of manufacturing an active material particle according to claim 9, wherein the particle comprises the graphene oxide.