US 12,015,154 B2
Cathode active material for lithium ion secondary battery and lithium ion secondary battery
Satoshi Kanada, Niihama (JP); Tetsutaro Hayashi, Niihama (JP); and Ryuta Sugiura, Toyota (JP)
Assigned to SUMITOMO METAL MINING CO., LTD., Tokyo (JP); and TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Appl. No. 17/264,357
Filed by SUMITOMO METAL MINING CO., LTD., Tokyo (JP); and TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
PCT Filed Jul. 3, 2019, PCT No. PCT/JP2019/026507
§ 371(c)(1), (2) Date Jan. 29, 2021,
PCT Pub. No. WO2020/026686, PCT Pub. Date Feb. 6, 2020.
Claims priority of application No. 2018-146244 (JP), filed on Aug. 2, 2018.
Prior Publication US 2021/0305568 A1, Sep. 30, 2021
Int. Cl. H01M 4/525 (2010.01); H01M 4/505 (2010.01); H01M 4/52 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/525 (2013.01) [H01M 4/505 (2013.01); H01M 4/52 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A cathode active material for a lithium ion secondary battery, the cathode active material comprising a lithium transition metal-containing oxide configured by secondary particles each formed of a plurality of primary particles, wherein lanthanum compound particles each having a perovskite-type structure are dispersed on surfaces of the secondary particles and/or in gaps or grain boundaries between the primary particles, and the lanthanum compound particles have a cross-sectional average particle size of 0.70 μm or less.