# US 10,374,226 B2 · Coated lithium-nickel composite oxide particles, and method for producing coated lithium-nickel composite oxide particles > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,374,226 B2 - Document ID: US10374226B2 - Status: Granted - Kind: B2 - Application number: 15/314,729 - Filed: 2015-05-20 - Published: 2017-07-13 - Granted: 2019-08-06 - Earliest claimed: 2014-05-30 - Assignees: Sumitomo Metal Mining Co., Ltd. - Applicants: Sumitomo Metal Mining Co., Ltd. - Inventors: Yosuke Ota; Hidetoshi Yamabe - Web page: https://patentgrep.com/patent/US10374226B2 ## CPC - H01M 4/366: {as layered products} - B01J 13/04: by physical processes, e.g. drying, spraying - C01G 53/42: containing alkali metals, e.g. LiNiO2 - H01M 4/0421: {involving vapour deposition} - H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx - H01M 4/1391: of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx - H01M 4/36: Selection of substances as active materials, active masses, active liquids - 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 - C01P 2006/40: Electric properties - H01M 10/052: Li-accumulators - Y02E 60/10: Energy storage using batteries - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS - 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 Provided are: superior coated lithium-nickel composite oxide particles which have an environmental stability that enables suppression of the occurrence of impurities due to absorption of moisture or carbon dioxide, which have high adhesion that prevents a coating layer from readily separating, and which have lithium ion conductivity; and a method for producing such particles. Provided is a method for producing coated lithium-nickel composite oxide particles, the method being characterized by contacting a cyclic siloxane with the surfaces of nickel-based lithium-nickel composite oxide particles to form surface coats. The particles have high adhesion to a coating layer and as a compound can suppress the permeation of moisture and carbon dioxide, and also have lithium ion conductivity. It is therefore possible to provide coated lithium-nickel composite oxide particles that are excellent for use in lithium ion cells. ## Claims ### Claim 1 Coated lithium-nickel composite oxide particles, wherein surface coats are formed on surfaces of nickel-based lithium-nickel composite oxide particles and the surface coats are silicone compounds represented by the following Formula (3) obtained by ring-opening reaction, (R1R2SiO)a[(R1)(R2)2SiO1/2]b(R1SiO3/2)c (3) wherein R1 represents a methyl group, R2 at least partially includes an ether group and represents a functional group including one or more selected from the group consisting of at least an ether group and a hydrogen group, and a, b, and c represent a positive integer including zero. ### Claim 2 (depends on 1) The coated lithium-nickel composite oxide particles according to claim 1, wherein the R2 in the above Formula (3) is an ether group of the following Formula (4), —CnH2n—O—CmH2m+1 (4) wherein n, and m represent an integer of from 2 to 10, respectively. ### Claim 3 (depends on 1) The coated lithium-nickel composite oxide particles according to claim 1, wherein mass of the surface coats is from 0.1 to 1.0% by mass based on the lithium-nickel composite oxide particles. ### Claim 4 (depends on 1) The coated lithium-nickel composite oxide particles according to claim 1, wherein the coated lithium-nickel composite oxide particles are used as a positive-electrode active substance of a lithium-ion battery. ### Claim 5 (depends on 1) The coated lithium-nickel composite oxide particles according to claim 1, wherein the coated lithium-nickel composite oxide particles are spherical particles having an average particle diameter of from 5 to 20 μm. ### Claim 6 (depends on 1) The coated lithium-nickel composite oxide particles according to claim 1, wherein the surface coats are formed onto the entire surface of the nickel-based lithium-nickel composite oxide particles. ### Claim 7 (depends on 1) The coated lithium-nickel composite oxide particles according to claim 1, wherein the surface coats are directly cross-linked to the surfaces of the nickel-based lithium-nickel composite oxide particles. ### Claim 8 (depends on 1) A method for producing the lithium-nickel composite oxide particles of claim 1, comprising: forming surface coats by bringing a cyclic siloxane into contact with surfaces of nickel-based lithium-nickel composite oxide particles. ### Claim 9 (depends on 8) The method for producing coated lithium-nickel composite oxide particles according to claim 8, wherein the cyclic siloxane is 2,4,6,8-tetramethylcyclotetrasiloxane of the following Formula (1), and forms surface coats by gas-phase contact ### Claim 10 (depends on 9) The method for producing coated lithium-nickel composite oxide particles according to claim 9, wherein an environmental temperature at the time of the gas-phase contact is from 40° C. to 100° C. ### Claim 11 (depends on 9) The method for producing coated lithium-nickel composite oxide particles according to claim 9, wherein an organic ether compound or organic ester compound having an unsaturated bond at one end is added to a residual hydrogen atom after the gas-phase contact. ### Claim 12 (depends on 8) The method for producing coated lithium-nickel composite oxide particles according to claim 8, wherein, the lithium-nickel composite oxide is represented by the following Formula (2), LixNi(1-y-z)MyNzO2) (2) wherein x is a value of from 0.80 to 1.10, y is a value of from 0.01 to 0.20, z is a value of from 0.01 to 0.15, and 1-y-z is a value exceeding 0.65, and M represents at least one element selected from Co or Mn, and N represents at least one element selected from Al, In or Sn.