Electrochemical cells

H - Electricity – 01 – M

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H01M 4/14 (2006.01) H01M 4/62 (2006.01) H01M 10/42 (2006.01) H01M 2/16 (2006.01)

Patent

CA 1281771

ABSTRACT OF THE DISCLOSURE Electrochemical Cells An electrochemical cell, e.g. a lead acid electric storage cell, comprises a positive electrode, a negative electrode, an aqueous electrolyte and, optionally, a porous cell component such as a cell separator interposed between the electrodes. To enhance access of electrolyte to one or both of the electrodes or to the component during operation of the cell and thereby improve cell performance, at least one of the component and the electrodes is porous and includes a promoter in the form of solid material other than graphite having, under the operating conditions of the cell, a zeta potential of such magnitude and polarity as to be capable of inducing electro-osmotic flow of electrolyte into the component or electrode when a current is flowing through electrolyte filled pores thereof. An example of such a material (termed an 'electro-osmosis promoter') is sulphonated polyvinylidene difluoride.

526831

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