Alkaline secondary cell
AssigneeExergy Power Systems, Inc.
InventorKaduo Tsutsumi
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Abstract
Carbon or cobalt, which is used as a conductive agent in an electrode of an alkaline secondary cell, is oxidized by oxygen generated from a positive electrode. The conductive agent degraded by oxidization loses its conductivity through repetitive charge and discharge, resulting in shortening of the cycle life of the cell. In an alkaline secondary cell filled with hydrogen, hydrogen generated from a positive electrode is bound to the hydrogen. This prevents a conductive agent in an electrode from being degraded by oxidization. A cell with excellent cycle life characteristic is thus provided.
Claims13
An alkaline secondary cell comprising:
- a negative electrode containing a hydrogen storage alloy;
- a positive electrode containing a positive electrode active material and a conductive agent;
- and
- a separator disposed between the positive electrode and the negative electrode,
- wherein
- hydrogen gas is filled in the alkaline secondary cell,
- the conductive agent includes partly graphitized soft carbon, and
- the negative electrode and the positive electrode are in contact with the hydrogen gas.
Dependencies are inferred from the claim text.