| 摘要 |
PURPOSE:To make the zinc electrode for an alkaline storage battery and the charge-discharge reactions of the battery uniform so as to improve the cycle characteristics by covering the surface of metallic zinc grains of zinc active material with specified two kinds of additives effectively and uniformly, and producing a mixture layer with the both additives. CONSTITUTION:The 1st additive is selected from metals or their compounds nobler than zinc such as indium, thallium, gallium and cadmium, and the 2nd additive is composed of alkali earth metal hydroxides or oxides, and the both additives produce a mixture layer to cover the surface of metallic zinc powder. The 1st additive makes the electro-precipitation of zinc acid ions onto the zinc surface slow and uniform, and effectively prevents the growth of dendrite zinc or the growth of inactive oxide film. The 2nd additive prevents the enlargement or the dissolution of zinc grains and the deformation of the zinc electrode 1. By the synergistic effect of the two additives, a zinc electrode of little variation with time due to the progress of the number of cycles can be obtained to improve the cycle characteristics. |
