US 11,894,557 B2
Positive active material, method of preparing the same, and lithium secondary battery including the same
Yang-Kook Sun, Seoul (KR)
Assigned to BATTERY SOLUTION, Seoul (KR)
Appl. No. 16/961,673
Filed by BATTERY SOLUTION, Seoul (KR)
PCT Filed Jan. 14, 2019, PCT No. PCT/KR2019/000561
§ 371(c)(1), (2) Date Jul. 11, 2020,
PCT Pub. No. WO2019/139445, PCT Pub. Date Jul. 18, 2019.
Claims priority of application No. 10-2018-0004416 (KR), filed on Jan. 12, 2018.
Prior Publication US 2020/0403240 A1, Dec. 24, 2020
Int. Cl. H01M 4/525 (2010.01); H01M 4/505 (2010.01); H01M 4/38 (2006.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/525 (2013.01) [H01M 4/382 (2013.01); H01M 4/505 (2013.01); H01M 10/0525 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A positive active material comprising:
a secondary particle in which a plurality of primary particles is agglomerated, wherein:
the positive active material is composed of a compound containing nickel, lithium, and oxygen, and
an average angle between a reference line that is a line connecting a center portion of the secondary particle and a center portion of the primary particle provided at the outermost portion of the secondary particle and a particle orientation line that is a line penetrating the center portion of the primary particle provided at the outermost portion of the secondary particle and extending in parallel to an orientation direction of the primary particles is 12.2° or less,
wherein a concentration of the nickel in the compound is 59 mol % or more,
wherein the compound further includes an added metal composed of a different element from the nickel and the lithium, and
wherein the added metal includes tungsten (W).