# US 8,465,872 B2 · Positive electrode active material sintered body for battery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,465,872 B2 - Document ID: US8465872B2 - Status: Granted - Kind: B2 - Application number: 12/595,088 - Filed: 2008-04-07 - Published: 2010-05-13 - Granted: 2013-06-18 - Earliest claimed: 2007-04-09 - Assignees: Kao Corporation; Nissan Motor Co., Ltd. - Applicants: Ryuichi Akagi; Kenichi Nishimura; Yasuhisa Fukumoto; Kyoichi Watanabe; Tamaki Miura; Takamitsu Saito - Inventors: Ryuichi Akagi; Kenichi Nishimura; Yasuhisa Fukumoto; Kyoichi Watanabe; Tamaki Miura; Takamitsu Saito - Web page: https://patentgrep.com/patent/US8465872B2 ## CPC - H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx - C01G 45/1228: of the type (MnO2)-, e.g. LiMnO2 or Li(MxMn1-x)O2 - H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy - C01P 2004/51: Particles with a specific particle size distribution - C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer - C01P 2006/12: Surface area - C01P 2006/14: Pore volume - C01P 2006/16: Pore diameter - C01P 2006/17: Pore diameter distribution - C01P 2006/40: Electric properties - 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 4/525: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy - H01M 10/052: Li-accumulators - H01M 2004/021: {Physical characteristics, e.g. porosity, surface area} - 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 positive electrode active material sintered body for a battery of the present invention is a positive electrode active material sintered body for a battery satisfying the following requirements (I) to (VII): (I) fine particles in a positive electrode active material are sintered to constitute the sintered body; (II) a peak pore diameter which provides a maximum differential pore volume value in a pore diameter range of 0.01 to 10 μm in a pore distribution is 0.3 to 5 μm; (III) a total pore volume is 0.1 to 1 cc/g; (IV) an average particle diameter is not less than the peak pore diameter and not more than 20 μm; (V) any peak, which provides a differential pore volume value of not less than 10% of the maximum differential pore volume value, is not present on a smaller pore diameter side than the peak pore diameter in the pore distribution; (VI) a BET specific surface area is 1 to 6 m2/g; and (VII) a full width at half maximum of a strongest X-ray diffraction peak is 0.13 to 0.2. ## Claims ### Claim 1 A positive electrode active material sintered body for a battery satisfying the following requirements (I) to (VII): (I) fine particles in a positive electrode active material and carbon particles are sintered to constitute the sintered body; (II) a peak pore diameter which provides a maximum differential pore volume value in a pore diameter range of 0.01 to 10 μm in a pore distribution measured by a mercury porosimeter is 0.3 to 5 μm; (III) a total pore volume measured by the mercury porosimeter is 0.1 to 1 cc/g; (IV) an average particle diameter in laser diffraction/scattering particle diameter distribution measurement is not less than the peak pore diameter and not more than 5 μm; (V) a peak, which provides a differential pore volume value of 10% or more of the maximum differential pore volume value and has a smaller pore diameter than the peak pore diameter in the pore distribution measured by the mercury porosimeter, is not present; (VI) a BET specific surface area is 2 to 6 m2/g; and (VII) a full width at half maximum of a strongest X-ray diffraction peak of the positive electrode active material sintered body is 0.13 to 0.2. ### Claim 2 (depends on 1) The positive electrode active material sintered body for the battery according to claim 1, wherein the positive electrode active material is lithium manganate. ### Claim 3 (depends on 1) A composite material for a lithium battery containing the positive electrode active material sintered body for the battery according to claim 1 and a conductive material. ### Claim 4 (depends on 3) The composite material for the lithium battery according to claim 3, wherein the conductive material is made of carbon. ### Claim 5 (depends on 3) A positive electrode for a lithium battery containing the composite material for the lithium battery according to claim 3 and a binder. ### Claim 6 (depends on 3) A lithium ion battery comprising a positive electrode containing the composite material for the lithium battery according to claim 3 and a binder. ### Claim 7 (depends on 1) The positive electrode active material sintered body for the battery according to claim 1, wherein (III) a total pore volume measured by the mercury porosimeter is 0.3 to 1 cc/g. ### Claim 8 A positive electrode active material sintered body for a battery satisfying the following requirements (I) to (IV) and (VI) to (VII): (I) fine particles in a positive electrode active material and carbon particles are sintered to constitute the sintered body; (II) a peak pore diameter which provides a maximum differential pore volume value in a pore diameter range of 0.01 to 10 μm in a pore distribution measured by a mercury porosimeter is 0.3 to 5 μm; (III) a total pore volume measured by the mercury porosimeter is 0.1 to 1 cc/g; (IV) an average particle diameter in laser diffraction/scattering particle diameter distribution measurement is not less than the peak pore diameter and not more than 5 μm; (VI) a BET specific surface area is 2 to 6 m2/g; and (VII) a full width at half maximum of a strongest X-ray diffraction peak of the positive electrode active material sintered body is 0.13 to 0.2. ### Claim 9 (depends on 8) The positive electrode active material sintered body for the battery according to claim 8, wherein the positive electrode active material is lithium manganate. ### Claim 10 (depends on 8) A composite material for a lithium battery containing the positive electrode active material sintered body for the battery according to claim 8 and a conductive material. ### Claim 11 (depends on 10) The composite material for the lithium battery according to claim 10, wherein the conductive material is made of carbon. ### Claim 12 (depends on 10) A positive electrode for a lithium battery containing the composite material for the lithium battery according to claim 10 and a binder. ### Claim 13 (depends on 10) A lithium ion battery comprising a positive electrode containing the composite material for the lithium battery according to claim 10 and a binder. ### Claim 14 (depends on 8) The positive electrode active material sintered body for the battery according to claim 8, wherein (III) a total pore volume measured by the mercury porosimeter is 0.3 to 1 cc/g.