| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery having improved battery performance.SOLUTION: A nonaqueous electrolyte secondary battery of the present invention includes: a positive electrode 1; a negative electrode 2 containing lithium titanate as an active material; a separator 3 arranged between the positive electrode 1 and the negative electrode 2; and a nonaqueous electrolytic solution 15. The nonaqueous electrolytic solution 15 contains an electrolyte excluding lithium borofluoride, a nonaqueous solvent, lithium borofluoride, and LiPOF. The nonaqueous electrolyte secondary battery of the present invention is held, in initial charging thereof, for a predetermined time in a voltage region where a single-electrode potential of the negative electrode relative to lithium metal is 1.7 V or more. |
