| 摘要 |
PURPOSE:To obtain a good cycle characteristic of the battery in the caption during the use thereof even under circumstances of both high and low temperature, by employing, as an electrolytic liquid, a water solution in which the electrolyte containing KOH and KF at respective specific ratios is saturated with ZnO. CONSTITUTION:In a Nickel-Zinc storage battery, a water solution in which an electrolyte containing KOH and KF is saturated with ZnO is used as an electrolyte. In this electrolytic liquid, the concentration of KOH is set to less than 28wt% and the sum of the concentration of KOH and that of KF is set to 30wt% or more. As the result of reduced concentration of hydroxide ion in the electrolytic liquid by thus setting the concentration of KOH in the electrolytic liquid to less than 28wt%, the oxygen over-voltage at a positive pole rises to enhance the cycle characteristic during high speed operation. In addition, because of the above-mentioned addition of KF, the ion concentration in the electrolytic liquid can be maintained even though the concentration of KOH is set below 28wt%, and any drop of conductivity of the electrolytic solution can be prevented even during operation at a temperature lower than 15 deg.C. |
