| 摘要 |
PURPOSE:To prevent any enlargement of the crystal diamerer of a negative active material and enhance the cycle life of a battery by restricting the grain diameters of zinc metal and zinc oxide, and alloying zinc metal with at least one chosen from among mercury, indium, lead and tin. CONSTITUTION:A zinc alloy powder which contains one or more elements chosen from among mercury, indium, lead and tin and has a grain diameter of 1-6mu as well as zinc oxide powder having a grain diameter of 0.1-0.5mu are used as zinc active materials. For instance, zinc metal powder having a grain diameter of 1-6mu is added to mercury chloride solution of 3-5% concentration, then the mixture is stirred and subjected to reaction so as to prepare fine mercury-zinc alloy grains containing about 3% by weight of mercury. Next, a polytetrafluoroethylene dispersion and water are kneaded into mixture powder consisting of 100pts.wt. zinc oxide powder with a grain diameter of 0.1-0.5mu, 10pts.wt. the above fine zinc alloy grains and 2pts.wt. mercury oxide before the thus obtained kneaded mixture is rolled into a paste sheet. After that, the paste sheet is brought into contact with both surface of a negative current collecting body before being rolled and fixed to it, thereby obtaining a zinc electrode 1 for an alkaline zinc storage battery. |
