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

Claim 0:
1. 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 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 comprises cobalt,
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.