Sumitomo Electric Industries, Limited

The Kansai Electric Power Co., Inc.

Tatsuhiko Sakamoto

Toshio Shigematsu

Masayuki Shimizu

Deteriorated positive electrolyte containing Fe.sup.3 /Fe.sup.2+ ions for a redox flow battery is regenerated in a negative electrolyte chamber of an electrolyte regenerating apparatus. For this purpose, a formic acid solution is introduced into a positive electrolyte chamber of the electrolyte regenerating apparatus and a voltage is applied between a negative electrode of the negative electrolyte chamber and a positive electrode of the positive electrolyte chamber, whereby excessive Fe.sup.3+ ions in the deteriorated positive electrolyte are changed to Fe.sup.2+ ions for regeneration. The formic acid is changed into carbon dioxide which is not noxious. All gases generated by the regeneration are not noxious, whereby the regeneration can be carried out with safety.

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Osaka, Japan

Tatsuhiko Sakamoto