Al secondary batteries with the ambient-temperature chloroaluminate molten salt electrolyte have been developed. Various conducting polymers were evaluated in order to improve the positive electrode. Among them, the electrochemical characteristics of poly-
p-phenylene (PPP) film were the most excellent. In the case of the charging below 50 mAh g
−1, the charge/discharge efficiency was around 100%. It was found that the PPP film electrode operated well as the positive electrode for Al secondary battery.
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