| 摘要 |
A nonaqueous electrolyte secondary battery includes: a positive electrode; a negative electrode; a nonaqueous electrolyte containing an electrolyte salt; and a separator, wherein in the electrolyte salt, a molar fraction x of at least one member selected among electrolyte salts represented by the following formulae (1) and (2) occupying in the whole electrolyte salt satisfies a relationship of (0.5<x≦̸1) LiPFaAc   (1) LiBFbB′d   (2) wherein a represents an integer of from 0 to 5; b represents an integer of from 0 to 3; each of A and B′ independently represents CnF2n+1; n represents an integer of from 1 to 6; c represents an integer of 1 or more and satisfies a relationship of (a+c=6); and d represents a an integer of 1 or more and satisfies a relationship of (b+d=4).
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