Patent ID: 11909032
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC C  H  Y | IPC C  H

Claim 28:
29. A composite cathode active material comprising:
a core comprising a plurality of primary particles; and
a shell on the core,
wherein the primary particles comprise a first lithium transition metal oxide comprising nickel,
wherein the first lithium transition metal oxide comprises a second metal, wherein the second metal comprises zirconium,
wherein the shell comprises a first layer and a second layer on the first layer,
wherein the first layer comprises a first composition represented by Formula 1A:

M1bOc 

wherein, in Formula 1A,
M1 is at least one of cobalt, magnesium, zirconium, aluminum, manganese, silicon, palladium, titanium, tin, iridium, platinum, ruthenium, cerium, boron, niobium, vanadium, iron, and zinc,
0.9≤b≤3.1, and 1.9≤c≤4.1,
the second layer comprises a second composition comprising cobalt and phosphorus, and an amount of the second composition included in the second layer is about 2 parts by weight or less based on 100 parts by weight of the first lithium transition metal oxide, and
wherein the core comprises a grain boundary located between primary particles of the plurality of primary particles, and the grain boundary comprises a third composition comprising Li2ZrO3.