# US 11,440,807 B2 · Positive electrode active material for secondary battery, method of preparing the same, and lithium secondary battery including the positive electrode active material > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,440,807 B2 - Document ID: US11440807B2 - Status: Granted - Kind: B2 - Application number: 16/757,214 - Filed: 2018-10-17 - Published: 2021-03-18 - Granted: 2022-09-13 - Earliest claimed: 2017-11-16 - Assignees: LG Chem, Ltd. - Applicants: LG Chem, Ltd. - Inventors: Jun Ho Eom; Sung Ho Ban; Hyeon Hui Baek; Na Ri Park - Web page: https://patentgrep.com/patent/US11440807B2 ## CPC - C01B 35/12: Borates {(C01B35/1063 takes precedence)} - C01G 53/42: containing alkali metals, e.g. LiNiO2 - H01M 4/36: Selection of substances as active materials, active masses, active liquids - H01M 4/485: of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) - 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 4/58: of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates - H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers - H01M 10/052: Li-accumulators - C01P 2002/54: one element only - C01P 2004/51: Particles with a specific particle size distribution - C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer - C01P 2006/40: Electric properties - Y02E 60/10: Energy storage using batteries - C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C} - 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) - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - 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 A method of preparing a positive electrode active material for a secondary battery is provided, which includes preparing a lithium composite transition metal oxide, and mixing the lithium composite transition metal oxide and a metal borate compound and performing a heat treatment to form a coating portion on surfaces of particles of the lithium composite transition metal oxide. The positive electrode active material prepared includes lithium composite transition metal oxide particles, and a coating portion formed on surfaces of the lithium composite transition metal oxide particles, wherein the coating portion includes lithium (Li)-metal borate. ## Claims ### Claim 1 A method of preparing a positive electrode active material for a secondary battery, comprising: preparing a lithium composite transition metal oxide; and mixing the lithium composite transition metal oxide and a metal borate compound and performing a heat treatment to form a coating portion comprising a lithium (Li)-metal borate on surfaces of particles of the lithium composite transition metal oxide, wherein the lithium composite transition metal oxide provides the source of Li for the Li-metal borate. ### Claim 2 (depends on 1) The method of claim 1, wherein the metal borate compound is a borate compound including at least one metal ion selected from the group consisting of zinc (Zn), zirconium (Zr), tungsten (W), magnesium (Mg), tin (Sn), aluminum (Al), barium (Ba), titanium (Ti), and vanadium (V). ### Claim 3 (depends on 1) The method of claim 1, wherein the metal borate compound is a Zn-borate compound. ### Claim 4 (depends on 1) The method of claim 1, wherein the lithium composite transition metal oxide comprises nickel (Ni), cobalt (Co) and at least one selected from the group consisting of manganese (Mn) and aluminum (Al), wherein an amount of nickel (Ni) in a total amount of transition metals in the lithium composite transition metal oxide is 60 mol % or more. ### Claim 5 (depends on 4) The method of claim 4, wherein the amount of the nickel (Ni) in the total amount of the transition metals in the lithium composite transition metal oxide is 80 mol % or more. ### Claim 6 (depends on 1) The method of claim 1, further comprising a coating method using dry mixing, wherein after nanoparticles are formed by milling the metal borate compound the dry mixing is performed. ### Claim 7 (depends on 1) The method of claim 1, wherein the lithium (Li)-metal borate is represented by Formula 1: LiaM1+x1B2+y1O3+z1 [Formula 1] wherein, in Formula 1, M is at least one selected from the group consisting of Zn, Zr, W, Mg, Sn, Al, Ba, Ti, and V, and 0