Alkaline cell with performance enhancing additives

H - Electricity – 01 – M

Patent

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Details

H01M 4/62 (2006.01) H01M 4/06 (2006.01) H01M 4/42 (2006.01) H01M 6/08 (2006.01)

Patent

CA 2477313

A sulfonic acid type organic surfactant is incorporated into the gelled anode mixture of an alkaline electrochemical cell, optionally with an organic phosphate ester surfactant. Zinc fines may also be incorporated into the anode. The electrolyte included in the anode mixture may have a reduced hydroxide concentration. When a cell is provided whose anode mixture includes the two surfactants and zinc fines alone or in combination with a lowered hydroxide concentration in the electrolyte, discharge leakage is reduced and gel gassing is suppressed relative to that of gels lacking both surfactants. Additionally, cell discharge performance is improved relative to that of cells lacking both the zinc fines and lowered hydroxide concentration.

Un tensioactif organique de type acide sulfonique est incorporé dans un mélange d'anode gélifiée de cellule alcaline électrochimique, éventuellement avec un tensioactif organique d'ester de phosphate. De fines particules de zinc peuvent également être incorporées dans ladite anode. L'électrolyte compris dans le mélange d'anode peut avoir une concentration réduite en hydroxyde. Lorsqu'une cellule dotée d'un mélange d'anode comprenant uniquement les deux tensioactifs et les fines particules de zinc ou lorsque l'électrolyte présente une faible concentration d'hydroxyde, la fuite de décharge est réduite et le gazage du gel est supprimé par rapport aux gels ne comprenant pas les deux tensioactifs. En outre, la performance de décharge cellulaire est améliorée par rapport aux cellules ne comprenant pas de zinc et présentant une faible concentration d'hydroxyde.

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