n-ブチルピリジニウムクロライド-AlCl₃系電解液を用いるAl/FeS₂型二次電池の開発

抄録

Al/FeS₂ secondary cells have been investigated as a candidate of specific energy batteries. In this study, the organic electrolyte, i. e., n-butyl pyridinium chloride (n-BPC)-AlCl₃, was used to get an adherent Al deposit and to operate the cell at around room temperatures. The cell with the electrolyte of [n-BPC]/[AlCl₃]=1 had a high open circuit voltage of 2.5V, while in the case of other composition electrolytes the voltages were about 2.0V. Various additives to the FeS₂ electrode were studied to improve the cell performance. The 45wt% graphite and 18mol% Cu₂S additives were the most promising. The cells with Al alloys (5052, 6063, or Al-0.05%In) as the negative electrode also had the high voltage and high capacity. The cyclic voltammetry and the rotating ring-disk electrode measurements were performed to analyze the electrochemical reaction of the positive electrode. It was assumed that the intermediates, S^2- and S^2-_n, are formed during the cathodic reaction of FeS₂.