US 11,837,725 B2
Positive electrode active material and lithium secondary battery comprising the same
Moon Ho Choi, Cheongju-si (KR); Seung Woo Choi, Cheongju-si (KR); Jun Won Suh, Cheongju-si (KR); Jin Kyeong Yun, Cheongju-si (KR); Jung Han Lee, Cheongju-si (KR); Gwang Seok Choe, Cheongju-si (KR); Joong Ho Bae, Cheongju-si (KR); and Du Yeol Kim, Cheongju-si (KR)
Assigned to ECOPRO BM CO., LTD., Cheongju-si (KR)
Filed by ECOPRO BM CO., LTD., Cheongju-si (KR)
Filed on Jan. 6, 2023, as Appl. No. 18/151,282.
Application 18/151,282 is a division of application No. 17/095,107, filed on Nov. 11, 2020, granted, now 11,588,154.
Claims priority of application No. 10-2019-0156946 (KR), filed on Nov. 29, 2019; and application No. 10-2020-0059446 (KR), filed on May 19, 2020.
Prior Publication US 2023/0163297 A1, May 25, 2023
Int. Cl. H01B 1/08 (2006.01); H01M 4/525 (2010.01); C01G 53/00 (2006.01); H01M 4/36 (2006.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/525 (2013.01) [C01G 53/50 (2013.01); H01B 1/08 (2013.01); H01M 4/366 (2013.01); H01M 10/0525 (2013.01); C01P 2002/54 (2013.01); C01P 2004/04 (2013.01); C01P 2004/54 (2013.01); C01P 2004/84 (2013.01); C01P 2006/40 (2013.01); H01M 2004/028 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A positive electrode active material, comprising:
primary particles enabling lithium intercalation/deintercalation and secondary particles in which the primary particles are aggregated,
wherein the average aspect ratio of the primary particles has a gradient increasing from the center region of the secondary particle to the surface region of the secondary particle,
wherein a dopant exhibits a concentration gradient decreasing from the surface region of the secondary particle toward the center region of the secondary particle, and
wherein the primary particle is represented by Formula 1 below:
LiwNi1−(x+y+z+z′)CoxM1yM2zNbz′O2  [Formula 1]
(Wherein, M1 is at least one selected from Mn and Al,
M2 is at least one selected from P, Sr, Ba, B, Ti, Zr, Mn, Al, W, Ce, Hf, Ta, Cr, F, Mg, Cr, V, Fe, Zn, Si, Y, Ga, Sn, Mo, Ge, Nd, Gd and Cu,
M1 and M2 are different elements, and
0.5≤w≤1.5, 0≤x≤0.50, 0≤y≤0.20, 0≤z≤0.20, and 0<z′≤0.20).