| 摘要 |
PROBLEM TO BE SOLVED: To solve problems that sulfate is produced in an electrolyte containing sulfuric acid as the main component when charging/discharging cycles are repeated, resulting in drop in electromotive force, drop in performance, and short life, and dispersion in electromotive force is produced by temperature change, causing the start failure of an engine in use in the coldest season or in a cold district. SOLUTION: Without using sulfuric acid as the main component of the electrolyte, an electrolyte containing a composition of a light metal sulfate, which is an environment-friendly, weakly acidic electrolyte, as the main component, and also containing small amounts of ammonium borofluoride and nicotine amide mixed in pure water is used.
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