| 摘要 |
PROBLEM TO BE SOLVED: To improve coulomb efficiency of a nonaqueous electrolyte storage element that uses a negative electrode containing, as a negative electrode active material, a material containing a metal element or a semi-metal element.SOLUTION: A nonaqueous electrolyte storage element includes: a negative electrode containing, as a negative electrode active material, a material containing a metal element or a semi-metal element; and a nonaqueous electrolyte. The nonaqueous electrolyte contains lithium ions (Li), bis(oxalate)borate ions (B(CO)), and boron fluoride ions (BF). The ratio (X/(X+Y)) of bis(oxalate)borate ions with respect to the sum of a molar number (X) of bis(oxalate)borate ions and a molar number (Y) of boron fluoride ions contained in the nonaqueous electrolyte is 0.21 or more and 0.88 or less. |
