# US 11,309,542 B2 · Nickel-based active material for lithium secondary battery, preparing method thereof, and lithium secondary battery including positive electrode including the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,309,542 B2 - Document ID: US11309542B2 - Status: Granted - Kind: B2 - Application number: 15/836,311 - Filed: 2017-12-08 - Published: 2018-06-14 - Granted: 2022-04-19 - Earliest claimed: 2016-12-08 - Assignees: Samsung SDI Co., Ltd. - Applicants: Samsung SDI Co., Ltd. - Inventors: Donggyu Chang; Jongmin Kim - Web page: https://patentgrep.com/patent/US11309542B2 ## CPC - H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy - C01G 53/42: containing alkali metals, e.g. LiNiO2 - C01G 53/504: with the molar ratio of nickel with respect to all the metals other than alkali metals higher than or equal to 0.5, e.g. Li(MzNixCoyMn1-x-y-z)O2 with x ≥ 0.5 - C01G 53/66: containing alkaline earth metals, e.g. SrNiO3 or SrNiO2 - 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 4/525: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy - H01M 50/107: having curved cross-section, e.g. round or elliptic (H01M50/103, H01M50/109, H01M50/11 take precedence) - C01P 2006/10: Solid density - C01P 2006/16: Pore diameter - H01M 10/052: Li-accumulators - 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 nickel-based active material for a lithium secondary battery includes a porous inner portion having closed pores and an outer portion, wherein the porous inner portion has a density less than that of the outer portion, and the nickel-based active material has a net density of 4.7 g/cc or less. A method of preparing the same, and a lithium secondary battery including a positive electrode including the nickel-based active material are provided. ## Claims ### Claim 1 A nickel-based active material for a lithium secondary battery, the nickel-based active material comprising a porous inner portion having closed pores and an outer portion, wherein the porous inner portion has a density less than that of the outer portion, the nickel-based active material has a net density of 4.7 g/cc or less, and wherein a volume of the porous inner portion is 20 to 35% based on a total volume of the nickel-based active material. ### Claim 2 (depends on 1) The nickel-based active material of claim 1, wherein a pore size of the closed pores is in a range of 150 nm to 1 μm in the porous inner portion. ### Claim 3 (depends on 1) The nickel-based active material of claim 1, wherein the porous inner portion has a porosity of 3 to 30%, and the porosity of the porous inner portion is 1.2 times or more greater than that of the outer portion. ### Claim 4 (depends on 1) The nickel-based active material of claim 1, wherein the outer portion has a radially arranged structure. ### Claim 5 (depends on 1) The nickel-based active material of claim 1, wherein the outer portion has a pore size of less than 150 nm. ### Claim 6 (depends on 1) The nickel-based active material of claim 1, wherein the nickel-based active material comprises plate particles, and major axes of the plate particles are radially arranged. ### Claim 7 (depends on 6) The nickel-based active material of claim 6, wherein the plate particles have an average thickness of 100 nm to 200 nm, and an average length of 150 nm to 500 nm. ### Claim 8 (depends on 6) The nickel-based active material of claim 6, wherein the plate particles have a ratio of an average thickness to an average length of 1:2 to 1:10. ### Claim 9 (depends on 1) The nickel-based active material of claim 1, wherein the nickel-based active material comprises a compound represented by Formula 1 below: Lia(Ni1-x-y-zCoxMnyMz)O2 Formula 1 wherein in Formula 1, M is an element selected from the group consisting of boron (B), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), titanium (Ti), vanadium (V), chromium (Cr), iron (Fe), copper (Cu), zirconium (Zr), and aluminum (Al), and 0.95≤a≤1.3, x≤(1-x-y-z), y≤(1-x-y-z), 0