| 摘要 |
The present invention addresses the problem of providing a high-concentration vanadium electrolyte that contains a high-concentration of vanadium ions that could not hitherto be prepared, that is used in circulating-type redox flow batteries or non-circulating-type redox non-flow batteries, and that is not prone to generating sludge; and a method and an apparatus for producing the high-concentration vanadium electrolyte. The abovementioned problem is solved by a high-concentration vanadium electrolyte which is a sulfuric acid solution containing vanadium ions within a range of over 1.7 mol/L to 3.5 mol/L. The vanadium electrolyte is prepared by: preparing a first solution obtained by mixing vanadium salt with fresh water to dissolve the vanadium salt, preparing a second solution by adding sulfuric acid to the first solution while conducting pre-electrolysis of the first solution, and using the second solution itself, or by adding, to the second solution, fresh water or fresh sulfuric acid for adjusting the second solution to a final total amount. |
