Reversible Electrochemical Reaction of a Fluoride Shuttle Battery with a Bismuth(III)Fluoride Electrode and Electrolyte Containing Triphenylboroxine as an Anion Acceptor

摘要

We previously developed a fluoride shuttle battery containing a bismuth(III)fluoride(BiF3)electrode; however,the battery exhibited several drawbacks including poor cycling performance and low practical capacity.In this research,to obtain a BiF3 electrode with high cycling performance and practical capacity,an electrolyte containing triphenylboroxine as an anion acceptor was used,as previously reported.Moreover,BiF3 was pulverized and adhered with conductive material using a planetary ball mill.The experimental results indicated that adhesion to the conductive material effectively increased the practical capacity of the BiF3 electrode.To increase adhesion of the conductive material with BiF3 particles,the rotation speed of the ball mill was increased.The resulting BiF3 electrode exhibited high practical capacity in the first cycle,which was maintained in the following cycle.X-ray absorption fine structure analysis results supported the progress of the reversible electrochemical reaction of the BiF3 electrode during the cycling.