| 摘要 |
PURPOSE:To give the oxygen catalyst function and the oxidation control function on the surface of a negative electrode, and to improve the discharge capacity, by furnishing an oxidation control layer which consists of a mixture of a hydrogen absorption alloy or a hydrate powder covered partitially by copper, nickel, or one of their alloys' and a carbon powder, on the surface of the negative electrode. CONSTITUTION:A metallic oxide positive electrode 4, a negative electrode 3 which consists of a hydrogen absorption alloy 1 or a hydrate, a separator 5, and an alkaline electrolyte are furnished, and on the surface of the negative electrode 3, is furnished an oxidation control layer 2 which consists of a mixture of the hydrogen absorption alloy 1 or the hydrate powder covered partially by copper, nickel, or one of their alloys, and a carbon powder. Moreover, in the hydrogen absorption alloy 1 or the hydrate powder, and the carbon powder, a catalyst is included in the particle surfaces of the both substances or either of them. Therefore, even in a relatively larger charge current, the oxidation prevention of the hydrogen absorption alloy 1 by the oxygen gas, and the oxygen absorption or oxygen ionization over the surface of the negative electrode 3 are proceeded in a good balance, and the battery inner pressure is restricted, while the charge and discharge cycle life can be extended. |
