US 12,224,436 B2
Cathode active material for lithium secondary battery and lithium secondary battery including same
Jongmin Kim, Yongin-si (KR); Soohyeon Kim, Yongin-si (KR); Jinhwa Kim, Yongin-si (KR); and Pilsang Yun, Yongin-si (KR)
Assigned to Samsung SDI Co., Ltd., Yongin-si (KR)
Appl. No. 16/962,635
Filed by Samsung SDI Co., Ltd., Yongin-si (KR)
PCT Filed Jan. 29, 2019, PCT No. PCT/KR2019/001201
§ 371(c)(1), (2) Date Jul. 16, 2020,
PCT Pub. No. WO2019/147098, PCT Pub. Date Aug. 1, 2019.
Claims priority of application No. 10-2018-0010990 (KR), filed on Jan. 29, 2018.
Prior Publication US 2020/0350582 A1, Nov. 5, 2020
Int. Cl. H01M 4/525 (2010.01); H01M 4/505 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/525 (2013.01) [H01M 4/505 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A cathode active material for a lithium secondary battery, comprising:
a secondary particle in which a plurality of primary particles are agglomerated,
the secondary particle comprising a core and a surface portion, and having a predetermined arrangement structure in which (003) surfaces of primary particles of the plurality of primary particles are aligned to be in a vertical direction with respect to respective tangent lines at points (P) at which the (003) surfaces of the primary particles meet a surface of the secondary particle; and
wherein the vertical direction in which the (003) surfaces of the primary particles are aligned is 90°±20° with respect to the respective tangent lines;
wherein a pore volume fraction of micropores of less than or equal to 10 nm of the secondary particle is greater than or equal to 10% of a total pore volume, and the micropores of less than or equal to 10 nm are at the surface portion of the secondary particle; and
wherein the secondary particle has an average pore size that decreases sequentially from an average pore size of the core to an average pore size of the surface portion.