Patent ID: 11942631
Assignee: NICHIA CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  C  Y | IPC C  H

Claim 0:
1. A positive electrode active material, comprising:
secondary particles each composed of an aggregate of primary particles that contain a lithium transition metal composite oxide having a layered structure and a composition ratio of a number of moles of nickel to a total number of moles of metals other than lithium of from 0.7 to less than 1,
wherein a compound containing boron is attached on at least a part of surfaces of the primary particles,
a compound containing sodium is present in at least a part of particle boundaries of the secondary particles, and
a value obtained by dividing a standard deviation of detection amounts of boron element in any three regions in a cross-sectional surface of the secondary particles by an average of the detection amounts is less than 0.18.