| 摘要 |
A battery capable of improving battery characteristics such as cycle characteristics is provided. The battery includes a spirally wound electrode body including a cathode and an anode spirally wound with a separator in between. The capacity of the anode includes a capacity component by insertion and extraction of light metal and a capacity component by precipitation and dissolution of the light metal, and is represented by the sum of them. The separator is impregnated with an electrolyte solution formed through dissolving a lithium salt in a solvent. As the electrolyte salt, difluoro[oxalato-O,O']lithium borate, tetrafluoro[oxalato-O,O']lithium phosphate or difluorobis[oxalato-O,O']lithium phosphate is used. By the formation of a stable coating, decomposition of the solvent and a reaction between precipitated lithium metal and the solvent can be prevented.
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