# US 2025/0096258 A1 · Positive Electrode Active Material and Method for Producing the Same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0096258 A1 - Document ID: US20250096258A1 - Status: Published application - Kind: A1 - Application number: 18/729,298 - Filed: 2023-05-22 - Published: 2025-03-20 - Earliest claimed: 2022-05-20 - Assignees: LG Chem, Ltd. - Applicants: LG Chem, Ltd. - Inventors: Won Sig Jung; Hyun Ah Park; Tae Young Rhee; Yong Jo Jung; Jong Pil Kim; Eung Ju Lee - Web page: https://patentgrep.com/patent/US20250096258A1 ## CPC - H01M 4/02: Electrodes composed of, or comprising, active material - 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 - C01G 53/44: containing manganese - C01G 53/50: of the type (MnO2)n-, e.g. Li(NixMn1-x)O2 or Li(MyNixMn1-x-y)O2 - 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 4/36: Selection of substances as active materials, active masses, active liquids - H01M 4/366: {as layered products} - H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy - H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers - H01M 10/052: Li-accumulators - C01P 2004/03: obtained by SEM - C01P 2006/40: Electric properties - H01M 2004/021: {Physical characteristics, e.g. porosity, surface area} - 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 A positive electrode active material includes a lithium transition metal oxide in the form of a single particle; and a coating part which is formed on the surface of the lithium transition metal oxide and contains cobalt. The lithium transition metal oxide in the form of a single particle has interfaces divided into a strong boundary having collapse of a layered structure in a crystal particle and a weak boundary having no collapse of the layered structure. The coating part is formed only at the strong boundary among the interfaces. A method for producing the positive electrode active material is also provided. ## Claims ### Claim 1 A positive electrode active material comprising: a lithium transition metal oxide in the form of a single particle; and a coating part which is formed on the surface of the lithium transition metal oxide in the form of the single particle, wherein the coating part contains cobalt, wherein the lithium transition metal oxide in the form of the single particle comprises interfaces divided into a strong boundary having collapse of a layered structure in a crystal particle and a weak boundary having no collapse of the layered structure, and the coating part is formed only at the strong boundary among the interfaces. ### Claim 2 (depends on 1) The positive electrode active material of claim 1, wherein the lithium transition metal oxide in the form of the single particle comprises 2 to 50 crystalline grains. ### Claim 3 (depends on 1) The positive electrode active material of claim 1, wherein the collapse of the layered structure of the strong boundary is collapse of a layered structure of a NiO layer. ### Claim 4 (depends on 1) The positive electrode active material of claim 1, wherein the strong boundary shows a shade difference in an electron backscatter diffraction (EBSD) band contrast map and Euler map, and the weak boundary shows no shade difference in the EBSD band contrast map, and shows a shade difference in the Euler map. ### Claim 5 (depends on 1) The positive electrode active material of claim 1, wherein the lithium transition metal oxide in the form of the single particle comprises at least 10% of the strong boundary relative to the number of the total interfaces. ### Claim 6 (depends on 1) The positive electrode active material of claim 1, wherein the strong boundary, in which the cobalt coating layer is formed, comprises a layered structure of nickel cobalt manganese oxide converted from the NiO layer. ### Claim 7 (depends on 1) The positive electrode active material of claim 1, wherein the cobalt coating layer formed at the strong boundary comprises a composition of LiCoO2. ### Claim 8 (depends on 1) The positive electrode active material of claim 1, wherein the lithium transition metal oxide is a lithium composite transition metal oxide comprising nickel, cobalt, and manganese. ### Claim 9 (depends on 1) The positive electrode active material of claim 1, wherein the lithium transition metal oxide is a lithium composite transition metal oxide represented by Formula 1 below: LiaNixCoyM1zM21-x-y-zO2 [Formula 1] wherein, in Formula 1 above, M1 is at least one selected from the group consisting of Mn and Al, M2 is at least one selected from the group consisting of B, Ba, Ce, Cr, F, Mg, V, Ti, Fe, Zr, Zn, Si, Y, Nb, Ga, Sn, Mo, W, P, S, Sr, Ta, La, and Hf, 1.0≤a≤1.3, 0.6≤x<1.0, 0≤y≤0.4, and 0≤z≤0.4. ### Claim 10 (depends on 1) The positive electrode active material of claim 1, wherein the lithium transition metal oxide is a lithium composite transition metal oxide represented by Formula 2 below: LiaNibCocMndM1eO2 [Formula 2] wherein, in Formula 2 above, M1 is at least one selected from the group consisting of Al, Zr, B, W, Mo, Cr, Nb, Mg, Hf, Ta, La, Ti, Sr, Ba, Ce, Sn, Y, Zn, F, P, and S, 0.9≤a≤1.1, 0.8≤b<1, 0