PREPARATION OF VANADIUM ELECTROLYTE WITH AID OF ASYMMETRIC VANADIUM-REDUCING ELECTROLYZER AND USE OF ASYMMETRIC VANADIUM-REDUCING ELECTROLYZER FOR REDUCING ELECTROLYTE CHARGE STATE BALANCE IN OPERATING REDUCTION-OXIDATION VANADIUM BATTERY Russian patent published in 2005 - IPC

FIELD: renewable electrochemical devices for energy storage in reduction-oxidation batteries.

SUBSTANCE: novelty is that acid vanadium electrolyte liquor that has in its composition V⁺³ and V⁺⁴ in desired concentration ratio introduced in electrolyte solution is produced from solid vanadium pentoxide by electrochemical method while at least partially reducing dissolved vanadium in acid electrolyte liquor; for the purpose electrolyte liquor is circulated through plurality of cascaded electrolyzers at least partially to V⁺³ degree; in this way reduced vanadium incorporating electrolyte liquor leaving the last of mentioned electrolyzers enters in reaction with stoichiometric amount of vanadium pentoxide to produce electrolyte liquor incorporating in effect vanadium in the V⁺³ form; acid and water are introduced to ensure definite molarity of liquor and the latter is continuously circulated through cascaded electrolyzers; stream of electrolyte liquor produced in the process that incorporates V⁺³ and V⁺⁴ in desired concentrations is discharged at outlet of one of electrolyzers of mentioned cascade. Each electrolyzer is distinguished by high degree of asymmetry and has cathode and anode of relevant surface morphology, geometry, and relative arrangement for setting current density on anode surface exceeding by 5 to 20 times that on projected cathode surface, oxygen being emitted from anode surface. Asymmetric electrolyzer of this type can be used in one of electrolyte circuits, positive or negative, of operating battery (cell) for reducing balance of respective oxidation degrees of their vanadium content.

EFFECT: facilitated procedure and reduced coast of vanadium electrolyte preparation.

10 cl, 4 dwg, 1 ex