CPC H01M 4/133 (2013.01) [H01M 4/131 (2013.01); H01M 4/134 (2013.01); H01M 10/0525 (2013.01); H01M 10/44 (2013.01); H01M 10/48 (2013.01); H01M 2004/027 (2013.01)] | 2 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 at a first constant current value I1st satisfying an expression described below, 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 Imax larger than the first constant current value I1st, after an end of the first charging step,
the expression being:
82/(81.8x+64)×(0.3/0.7)−α≤I1st/Imax≤82/(81.8x+64)×(0.3/0.7)+α,
wherein α=0.3, and
wherein the charging method further comprises:
a second charging step of charging at a second constant current value I2nd satisfying an expression described below, between the first charging step and the large current charging step,
the expression being:
36/(122.4x+10.9)×(0.5/0.7)−α≤I2nd/Imax≤36/(122.4x+10.9)×(0.5/0.7)+α.
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