Compositions, zinc electrodes, batteries and their methods...

H - Electricity – 01 – M

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H01M 4/60 (2006.01) H01M 4/24 (2006.01) H01M 4/42 (2006.01) H01M 4/62 (2006.01) H01M 10/26 (2006.01)

Patent

CA 2441224

A zinc electrode for use in rechargeable electrochemical cells with enhanced cycle life is described. The electrode active mass comprises a source of electrochemically active zinc and at least one fatty acid or a salt, ester or derivative thereof, or an alkyl sulfonic acid or a salt ester or derivative thereof. The zinc electrode exhibits low shape change and decreased dendrite formation compared to known zinc electrodes, resulting in electrochemical cells which have improved capacity retention over a number of charge/discharge cycles.

L'invention concerne une électrode en zinc à cycle de vie prolongé utilisée dans des cellules électrochimiques rechargeables. La masse active de l'électrode comprend une source de zinc électrochemiquement active, et au moins un acide gras ou un sel, un ester ou un dérivé de celui-ci, ou un acide sulfonique d'alkyle ou un ester de sel ou un dérivé de celui-ci. L'électrode en zinc présente une faible modification de forme et une formation de dendrite réduite par rapport aux électrodes en zinc connues, ce qui permet d'obtenir des cellules électrochimiques à conservation de capacité améliorée par rapport au nombre de cycles de charge/décharge.

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