| 摘要 |
PURPOSE:To aim at improvement in battery performance as checking a generation rate of hydrogen gas, by using a specific zinc alloy as a negative electrode active material. CONSTITUTION:In this battery, as a negative electrode active material, such a zinc alloy that contains lead of 0.005-0.5wt%, indium of 0.001-0.5wt%, aluminum of 0.005-0.5wt%, and a total amount of 0.0001-0.5wt% of more than one kind to be selected from beryllium, strontium and barium is used. And, the zinc alloy is used as it is or after being gelatinized. In case of a rate of content of lead, indium and aluminum, and furthermore more than one kind to be selected from beryllium, calcium, strontium and barium being less than the lower limit, no effect in this invention is secured, and when it exceeds the upper limit, its self-discharge progresses as in zinc containing impurities, therefore favorable results for restraint of gas generation and discharge capacity are not expected. In addition, it is desirable that a rate of content of more than one kind to be selected from aluminum, beryllium, calcium, strontium and barium is in the range of 0.005-0.2wt%, therefore when it goes beyond the range of 0.2wt%, the content effect is not seen so much. |
