Inorganic separator for alkaline electrochemical cells

Details Inorganic separator for alkaline electrochemical cells Inorganic separator for alkaline electrochemical cells

H - Electricity

01

M

319/60, 18/65

H01M 2/16 (2006.01)

Patent

CA 1056904

ABSTRACT OF THE INVENTION An improved separator for alkaline electrochemical cells having zinc negative electrodes comprises rare earth inorganic hydroxide in finely divided solid particulate form dispersed uniformly within a shape-retaining non-reactive matrix. The matrix may be, for example, polytetrafluoroethylene or the like and the separator is insoluble and chemically inert in the cell electrolyte. The separator traps or chemically combines with soluble zinc ions so as to keep the ions within the compart- ment containing the zinc electrode. This reduces the solubility of the zinc electrode. The resultant reduction in shape change reduces the shift in electrical properties which occurs during cycling of the cell. An improved method of making the novel separator is also provided wherein a mixture of the hydroxide and the matrix material is extruded into a thin sheet.

250960

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