# US 2020/0403226 A1 · Positive electrode active material, method for producing positive electrode active material, positive electrode, and secondary battery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0403226 A1 - Document ID: US20200403226A1 - Status: Published application - Kind: A1 - Application number: 16/646,654 - Filed: 2018-09-12 - Published: 2020-12-24 - Earliest claimed: 2017-09-15 - Assignees: Sanoh Industrial Co., Ltd. - Applicants: Sanoh Industrial Co., Ltd - Inventors: Koga-shi, ARAI; Kazuyuki SUGITA; Atsushi HONDA; Yuichiro TAKIMOTO; Hideki KURIHARA; Masashi INAMOTO; Kyousuke DOUMAE - Web page: https://patentgrep.com/patent/US20200403226A1 ## CPC - H01M 4/364: {as mixtures} - H01M 4/48: of inorganic oxides or hydroxides - C01G 31/00: Compounds of vanadium - C01G 31/02: Oxides - H01M 4/0471: {involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis} - 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 4/1391: of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx - H01M 4/1393: of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx - 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 - H01M 10/054: Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium - C01P 2002/72: by d-values or two theta-values, e.g. as X-ray diagram - C01P 2004/03: obtained by SEM - C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer - C01P 2006/40: Electric properties - 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 - C01G: COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts or peroxyacids C01B15/00; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium, or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds containing nitrogen, other non-metals and metal C01B21/082}; metal amides C01B21/092; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanamide C01C3/16; thiocyanates C01C3/20) - C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract The invention discloses a positive electrode active material for a magnesium secondary battery or lithium ion secondary battery, including: a particle including a nucleus and a crystal of vanadium oxide grown from the nucleus as a starting point and having a maximum length of 5 μm or less in the major axis direction. ## Claims ### Claim 1 A positive electrode active material for a magnesium secondary battery or lithium ion secondary battery, comprising: a particle comprising a nucleus and a crystal of vanadium oxide grown from the nucleus as a starting point and having a maximum length of 5 μm or less in a major axis direction. ### Claim 2 (depends on 1) The positive electrode active material according to claim 1, wherein the nucleus is formed of at least one selected from the group consisting of a titanium compound, an iron compound, and graphite. ### Claim 3 (depends on 1) A positive electrode comprising the positive electrode active material according to claim 1. ### Claim 4 (depends on 3) A secondary battery comprising the positive electrode according to claim 3, wherein the secondary battery is a lithium ion secondary battery or a magnesium secondary battery. ### Claim 5 A method for producing a positive electrode active material for a magnesium secondary battery or a lithium ion secondary battery, comprising: a step (1) of mixing a nucleation material solution in which the nucleation material is dissolved or dispersed and a solution containing a vanadium compound to form a mixed solution; a step (2) of adjusting the mixed solution to be acidic; and a precipitation step (3) of precipitating a crystal of vanadium oxide, wherein the precipitation step (3) is a step (3a) of precipitating vanadium oxide starting from a nucleus by precipitating the nucleus in the mixed solution, or a step (3b) of precipitating vanadium oxide starting from the nucleation material dispersed in the mixed solution. ### Claim 6 (depends on 5) The method for producing a positive electrode active material according to claim 5, wherein the nucleation material is at least one selected from the group consisting of a titanium compound, an iron compound, and graphite. ### Claim 7 (depends on 5) The method for producing a positive electrode active material according to claim 5, wherein the precipitation step is performed at a temperature of 50 to 100° C. ### Claim 8 (depends on 5) The method for producing a positive electrode active material according to claim 5, wherein the mixed solution comprises a carbonate compound. ### Claim 9 (depends on 8) The method for producing a positive electrode active material according to claim 8, wherein the carbonate compound is at least one selected from the group consisting of sodium carbonate, ammonium carbonate, potassium carbonate, lithium carbonate, sodium hydrogen carbonate, ammonium hydrogen carbonate, and potassium hydrogen carbonate. ### Claim 10 (depends on 5) The method for producing a positive electrode active material according to claim 5, further comprising a step of firing the vanadium oxide crystals precipitated in the precipitation step at a temperature of 260 to 315° C. ### Claim 11 A positive electrode active material for a magnesium secondary battery or lithium ion secondary battery, comprising: a particle comprising a crystal of a vanadium oxide which is grown from a nucleus as a starting point and whose growth is suppressed to a maximum length of 5 μm or less in a major axis direction. ### Claim 12 (depends on 11) The positive electrode active material according to claim 11, wherein the nucleus is formed of at least one selected from the group consisting of a titanium compound, an iron compound, and graphite. ### Claim 13 (depends on 11) A positive electrode comprising the positive electrode active material according to claim 11. ### Claim 14 (depends on 13) A secondary battery comprising a positive electrode according to claim 13, which is a lithium ion secondary battery or a magnesium secondary battery. ### Claim 15 (depends on 2) A positive electrode comprising the positive electrode active material according to claim 2. ### Claim 16 (depends on 15) A secondary battery comprising the positive electrode according to claim 15, wherein the secondary battery is a lithium ion secondary battery or a magnesium secondary battery. ### Claim 17 (depends on 12) A positive electrode comprising the positive electrode active material according to claim 12. ### Claim 18 (depends on 17) A secondary battery comprising a positive electrode according to claim 17, which is a lithium ion secondary battery or a magnesium secondary battery.