US 12,249,711 B2
Positive-electrode active material for lithium-ion secondary battery and lithium-ion secondary battery
Ayumi Miura, Ehime (JP); Hiroyuki Fujimoto, Osaka (JP); Masanori Maekawa, Osaka (JP); and Kaoru Nagata, Osaka (JP)
Assigned to SUMITOMO METAL MINING CO., LTD., Tokyo (JP); and Panasonic Energy Co., Ltd., Osaka (JP)
Appl. No. 17/753,751
Filed by SUMITOMO METAL MINING CO., LTD., Tokyo (JP)
PCT Filed Sep. 16, 2020, PCT No. PCT/JP2020/035157
§ 371(c)(1), (2) Date Mar. 14, 2022,
PCT Pub. No. WO2021/054381, PCT Pub. Date Mar. 25, 2021.
Claims priority of application No. 2019-168510 (JP), filed on Sep. 17, 2019.
Prior Publication US 2022/0376241 A1, Nov. 24, 2022
Int. Cl. H01M 4/525 (2010.01); H01M 4/04 (2006.01); H01M 4/505 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/525 (2013.01) [H01M 4/0471 (2013.01); H01M 4/505 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A positive-electrode active material for a lithium-ion secondary battery, wherein
an average pore size of the positive-electrode active material is 0.2 μm to 1.0 μm when a pore size is measured in a range of 0.0036 μm to 400 μm and
when a ratio S2/S1 of a cumulative specific surface area S2 measured in a range of the pore size of 0.0036 μm to 0.5 μm to a cumulative specific surface area S1 measured in the range of the pore size of 0.0036 μm to 400 μm is set as a proportion of micropores, the proportion of micropores is 70% to 92%.