CPC H01M 4/525 (2013.01) [H01M 10/0525 (2013.01); H01M 10/0568 (2013.01); H01M 10/0569 (2013.01); H01M 2300/004 (2013.01); H01M 2300/0034 (2013.01)] | 4 Claims |
1. A nonaqueous electrolyte secondary battery comprising: a positive electrode containing one or more positive electrode active materials; a negative electrode; and a nonaqueous electrolyte containing a fluorine compound, wherein:
the positive electrode active materials include a complex oxide A containing Li, Ni, and W and a complex oxide B containing Li, Ni, and W as an optional element;
W content in the complex oxide A is 5 mol % or more;
W content in the complex oxide B is 0.5 mol % or less; and
a mass ratio of the complex oxide A is 0.002% or more and 0.1% or less relative to the total of the complex oxide A and the complex oxide B.
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