Coherent manganese dioxide electrodes, process for their production, and electrochemical cells utilizing them
AssigneeUnion Carbide Corporation
InventorsKarl V. Kordesch, Akiya Kozawa
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Abstract
Coherent manganese dioxide electrodes comprising particulate manganese dioxide and particulate electrically conductive material substantially uniformly dispersed in a conductive binder wherein said binder comprises colloidal electrically conductive material having a surface area as defined by the B.E.T. method using N.sub.2 absorption at 78.degree.K of less than about 100m.sup.2 /g, and an electrolyte-wettable polymeric binder.
Claims20
A coherent electrode for use in electrochemical devices having an aqueous electrolyte, said electrode comprising particulate manganese dioxide and particulate electrically conductive material both of which are substantially dispersed in a binder, said binder comprising colloidal electrically conductive material having a surface area as defined by the B.E.T. method using N.sub.2 absorption at 78.degree.K. of less than about 100 m.sup.2 /g, and an electrolyte-wettable polymer, thereby forming a polymeric binder.
Process for producing a coherent electrode comprising the steps:
- a. preparing a first mixture of an electrolyte-wettable polymeric binder and a colloidal electrically conductive material so as to form a conductive binder mixture;
- b. mixing particulate manganese dioxide, particulate electrically conductive material and the conductive binder mixture of step a) to form a mixture of said materials;
- and
- c. forming said mixture of the four materials into a coherent electrode wherein the particulate manganese dioxide and particulate electrically conductive material are dispersed in the conductive binder composed of the colloidal electrically conductive material and the electrolyte-wettable polymeric binder.
Dependencies are inferred from the claim text.