Patent ID: 11955622
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 is a multiphase mixture including a first phase having a crystal structure belonging to space group C2/m and a second phase having a crystal structure belonging to space group R-3m,
the lithium composite oxide satisfies a mathematical expression (I): 0.05≤integrated intensity ratio I(20°-23°)/I(18°-20°)≤0.26, where
the integrated intensity ratio I(20°-23°)/I(18°-20°) is equal to a ratio of an integrated intensity I(20°-23°) to an integrated intensity I(18°-20°);
the integrated intensity I(18°-20°) is an integrated intensity of a first maximum peak present in a diffraction angle 2θ range of greater than or equal to 18° and less than or equal to 20° in an X-ray diffraction pattern of the lithium composite oxide; and
the integrated intensity I(20°-23°) is an integrated intensity of a second maximum peak present in a diffraction angle 2θ range of greater than or equal to 20° and less than or equal to 23° in the X-ray diffraction pattern of the lithium composite oxide, and

the lithium composite oxide has an average composition represented by a compositional formula (I): LixMnyOαQβ, where,
Q is at least one selected from the group consisting of F, Cl, N, and S; and
following four mathematical expressions:

1.05≤x≤1.5,

0.6≤y≤1.0,

1.2≤α≤2.0, and

0<β≤0.8, are satisfied.