Improvements to ni-zn battery

H - Electricity – 01 – M

Patent

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Details

H01M 10/28 (2006.01) H01M 10/30 (2006.01) H01M 2/16 (2006.01) H01M 4/02 (2006.01)

Patent

CA 2422652

The invention concerns an alkaline Ni-Zn battery comprising both anolyte (E) partially or totally in the form of a viscous phase such as a gel, and catholyte (D) optionally in the form of a viscous phase, a microporous separator (A) between the anolyte and the catholyte, the anolyte and the catholyte having different compositions and volume, and an assembly of bipolar elements. The microporous separator is enclosed between impregnated macroporous separators (F) of the anolyte and the catholyte respectively. The total volume of the anolyte and of the catholyte is contained in the porosity of the macroporous separators and in the porosity of the electrodes. The microporous separator is for example based on cellulose or polypropylene. The inventive Ni-Zn battery has good charging/discharging cycles and low plate resistance.

L'invention concerne une batterie alcaline Ni-Zn comprenant à la fois l'anolyte (E) en partie ou totalement sous la forme d'une phase visqueuse telle qu'un gel, le catholyte (D) éventuellement sous forme d'une phase visqueuse, un séparateur microporeux (A) entre l'anolyte et le catholyte, des compositions et des volumes différents pour l'anolyte et le catholyte et un assemblage bipolaire des éléments. Le séparateur microporeux est enserré entre des séparateurs (F) macroporeux imprégnés respectivement de l'anolyte et du catholyte. Le volume total de l'anolyte et du catholyte est contenu dans la porosité des séparateurs macroporeux et dans la porosité des électrodes. Le séparateur microporeux est par exemple à base de cellulose ou de polypropylène. La batterie Ni-Zn selon l'invention présente un bon comportement en cyclage et une résistance interne faible.

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