Abstract
Lithium secondary batteries that use a room-temperature ionic liquid as an electrolyte were investigated for the purpose of realizing high-safe batteries. For the improvement of stability under charge/discharge operation with electrodes, we focused attention on a series of l-alkyl-3-methyl-imidazolium bis(trifluoromethane sulfonyl)imide. The temperature dependence of ionic conductivity and battery charge-discharge performance were examined by changing the alkyl chain lengths: -methyl/-ethyl/-butyl/-hexyl/-octyl. According to the results, the effects of extending the alkyl chain were confirmed in, for example, the increase in carrier ion number, and the improvement of battery charge-discharge performance characteristics.
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