PURPOSE: To suppress hydrogen gas evolution to the similar extent as amalgamated zinc used as anode active material by using zinc-thalium alloy anode and alkaline electrolyte prepared by dissolving a specified amount of zinc oxide.
CONSTITUTION: A zinc-thallium alloy anode and alkaline electrolyte containing 1∼7% zinc oxide are used. For example, monothallium nitrate is dissolved in water, then zinc powder is added in this solution and stirred. Thallium deposited on the surface of zinc particle is alloyed with zinc from the surface in order. The solution is filtered out and zinc-thallium alloy is dried to obtain zinc-thallium alloy powder for anode active material. Potassium hydroxide solution is heated to 80°C, and zinc oxide is added to the solution so that the content of the zinc oxide becomes 1∼7% to obtain alkaline electrolyte.
UBUKAWA SATOSHI
YANO MUTSUMI
