Improved vanadium bromide battery (metal halide redox flow...

H - Electricity – 01 – M

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H01M 8/20 (2006.01) H01M 4/86 (2006.01) H01M 4/96 (2006.01) H01M 8/08 (2006.01) H01M 8/18 (2006.01) H01M 10/44 (2006.01)

Patent

CA 2483894

A 3 M V(IV) bromide solution in 3-4 M HBr or HBr/HCl mixture is added to both sides of the redox flow cell or battery. On fully charging the cell, the vanadium (IV) bromide solution is reduced to produce 3M VBr2 in the negative half-cell, while the bromide ions in the positive half-cell are oxidised to produce 1.5 M Br3- or CIBr2. On discharge, the VBr2is oxidised to VBr3 in the negative half cell while the Br3 or ClBr2- ions are reduced to Br ions in the positive half cell. The cell comprises carbon or graphite felt bonded onto plastic or conducting plastic sheets as substrate materials and the two half cells are separated by an anion or cation exchange membrane.

L'invention concerne une solution de bromure 3M V(IV) dans un mélange 3-4M HBr/HC1 qui est ajoutée aux deux côtés d'une batterie ou d'une pile à circulation. Lors du chargement total de la pile, la solution de bromure vanadium (IV) est réduite pour produire du 3M VBr¿2? dans la demi-pile négative, tandis que les ions bromure dans la demi-pile positive sont oxydisés pour produire du 1,5M Br¿3??-¿ ou ClBr¿2??-¿. Lors de la décharge, le VBr¿2? est oxydisé en VBr¿3? dans la demi-pile négative, tandis que les ions Br¿3??-¿ ou ClBR¿2??-¿ sont réduits en ions Br?-¿ dans la demi-pile positive. Ladite pile comprend un feutre de carbone ou de graphite fixé sur du plastique ou des feuilles de plastique conductrices utilisées en tant que matière support et les deux demi-piles sont séparées par une membrane échangeuse d'anions ou de cations.

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