CPC H02J 7/00712 (2020.01) [H01M 4/364 (2013.01); H01M 4/483 (2013.01); H01M 4/587 (2013.01); H01M 10/0525 (2013.01); H01M 10/44 (2013.01); H01M 10/48 (2013.01); H02J 7/0048 (2020.01); H01M 2004/027 (2013.01)] | 3 Claims |
1. A charging method of a non-aqueous electrolyte secondary battery comprising a negative electrode including a carbon material and a silicon compound as a negative electrode active material, comprising:
a first charging step of charging a battery capacity Q1st satisfying an expression described below at a first constant current value, when a ratio of a capacity of the silicon compound to a rated capacity Q is x (0.1≤x≤0.5); and
a large current charging step of charging at a constant current value larger than the first constant current value, after an end of the first charging step,
the expression being: 0.38x+0.063−α≤Q1st/Q≤0.38x+0.063+α
wherein α=0.1.
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