| 摘要 |
PURPOSE:To prevent gas generation in alkali cell while it is stored, by using a zinc negative electrode which is provided by zinc powder with gallium deposited on the surface thereof and free from mercury. CONSTITUTION:A zinc negative electrode 4 of zinc powder with gallium existing on the surface thereof and not amalgamated with mercury is used. The gallium concentration should preferably be 0.01-0.1% by weight to the zinc powder. By way of example, 100 parts of zinc powder is mixed, at 30 deg.C, with a solution of 5.0 parts of gallium sulfate dissolved in 100 parts of water; the mixture is then held for 24hr gently shaken, whereby the gallium ion in the water solution is substitutionally deposited on the zinc as Ga in the proportion of approximately 0.1%; and the same is wahsed and dehydrated and thereafter mixed with an electrolyte composed of about 37% of KOH, 4.5% of ZnO, 1.5% of poly acrylic sodium, and remaining portion of water, whereby the negative electrode 4 is formed. |
