| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a redox flow battery that can improve energy density. <P>SOLUTION: A redox flow battery 100 is charged and discharged by supplying a positive-electrode electrolyte and a negative-electrode electrolyte to a positive-electrode cell 102 and a negative-electrode cell 103 respectively. The positive-electrode electrolyte and the negative-electrode electrolyte each contains vanadium (V) ions as an active material. The positive-electrode electrolyte further contains metal ions, such as manganese ions, having a more electropositive potential than that of the V ions, and the negative-electrode electrolyte further contains metal ions, such as chrome ions, having a more electronegative potential than that of the V ions. The redox flow battery 100 can suppress side reactions, such as gas production of oxygen gas and hydrogen gas by decomposition of water and oxidation degeneration of an electrode, as the other metal ions contained together with the V ions are oxidized and reduced in the ending of charging, even when the battery is charged up substantially to 100% of charging depth. Consequently, the charging depth can be enhanced to increase the use rate of the V ions in the electrolytes, so the energy density is made higher than that of a conventional redox flow battery. <P>COPYRIGHT: (C)2012,JPO&INPIT |
