| 摘要 |
PROBLEM TO BE SOLVED: To obtain an electrolyte, including an additive, for improving charging and discharging reversibility of a metal lithium negative electrode. SOLUTION: In the electrolyte for a lithium secondary battery having a metal lithium negative electrode, an additive in the range of 10-2,000 ppm of a compound composed of positive ions of a metal, such as aluminum iodide, etc., alloyed with lithium and iodide negative ions, is included in the electrolyte obtained by dissolving an organic fluorine-containing lithium salt in a nonaqueous solvent such as a carbonate solvent, etc. The use of this additive enables to keep good charging and discharging reversibility in the metal lithium negative electrode, to drastically improve reversibility of dissolution and deposition of the metal lithium compared to an electrolyte having no additive. |
