CPC H01M 4/366 (2013.01) [H01M 4/131 (2013.01); H01M 4/485 (2013.01); H01M 10/0525 (2013.01); H01M 2004/027 (2013.01)] | 5 Claims |
1. A nonaqueous electrolyte secondary battery comprising a cathode, an anode, and a nonaqueous electrolyte,
the cathode including a cathode active material layer that contains a granular cathode active material;
the granular cathode active material including:
a core part that contains a lithium-transition metal composite oxide of a layered structure, a mean particle size of the core part is from 0.1 μm to 20 μm;
a tungsten-concentrated layer that is formed over a surface of the core part and has a higher tungsten concentration determined by a TEM-EDX analysis than the core part; and
a lithium-tungsten compound particle that adheres to at least part of a surface of the tungsten-concentrated layer and contains tungsten and lithium, the tungsten-concentrated layer is an amorphous structure, and the lithium-tungsten compound particle has a higher tungsten concentration than the tungsten-concentrated layer, and an atomic concentration of tungsten in the lithium-tungsten compound particle is 90 at % or more based on a total number of transition metal atoms.
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