C131 レドックスフローバッテリーの充放電効率に及ぼす電解液流動条件の影響解析(OS4 省エネルギー・コジェネ・ヒートポンプ(2))

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  • C131 Effect of Electrolyte Flow Condition on Charge-Discharge Efficiency in Redox Flow Battery

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In vanadium redox flow battery, energy efficiency decreases mainly because of ohmic loss IR_<cell> and concentration overpotential η_<con>. Especially capacity loss by early shutdown timing of charge and discharge process is strongly affected by η_<con>, which depends on mass transfer of active species to reaction area. In this study, we conducted charge-discharge experiments with a single cell battery in order to investigate the behavior of cell voltage around shutdown and elucidate the relationship between mass transfer coefficient k and electrolyte flow condition. It was shown that that the k is proportional to 0.5〜0.6th power of mean electrolyte flow velocity ν, and the coefficients are different for the charge and discharge processes.

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