Patent ID: 11923529
Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  C  Y | IPC C  H

Claim 0:
1. A positive electrode active material comprising:
a lithium composite oxide,
wherein the lithium composite oxide contains
first particles having a crystal structure belonging to space group R-3m, and
second particles having a crystal structure belonging to space group C2/m,

the crystal structure of the second particles has a larger amount of cation mixing than the crystal structure of the first particles,
the second particles have a smaller particle size than the first particles, and
the following mathematical formula (I) is satisfied:

0.05≤integrated intensity ratio I(18°-20°)/I(43°-46°)≤0.99  (I),

where the integrated intensity ratio I(18°-20°)/I(43°-46°) is a ratio of an integrated intensity I(18°-20°) to an integrated intensity I(43°-46°),
the integrated intensity I(18°-20°) is an integrated intensity of a first peak that is a maximum peak present in a range of angle of diffraction 2° greater than or equal to 43° and less than or equal to 46° in an X-ray diffraction pattern of the lithium composite oxide, and
the integrated intensity I(18°-20°) is an integrated intensity of a second peak that is a maximum peak present in a range of angle of diffraction 2θ greater than or equal to 18° and less than or equal to 20° in the X-ray diffraction pattern of the lithium composite oxide.