チタン　マンガンケイ　レドックスフロー　デンチ　ノ　ブザイ　カイハツ

Abstract

Redox flow batteries are suitable for large-capacity energy storage in principle and for applications in combination with renewable energy. However, thorough cost reduction is a challenge for their full-scale introduction. Therefore, we have developed a titanium (Ti) -manganese (Mn) electrolyte as an inexpensive electrolyte. In the electrolyte development, we found that the presence of Ti ions (IV) in the Mn electrolyte suppressed the disproportionation reaction of Mn ions (III) and the particle growth of MnO₂ precipitation. In the electrode development, we found carbon electrode materials with excellent oxidation durability and reactivity. We optimized the surface treatment conditions of the carbon electrode to obtain a high energy-efficiency of 83.2% in Ti-Mn electrolyte. Then, we confirmed that 10 kW-class cells using the developed material could provide long-term stable charge-discharge for more than 140 cycles at an energy density of more than 14 kWh/m³.論