| 摘要 |
PURPOSE:To enhance the battery efficiency by allowing electrolyte to contain complex agent, zinc bromide, and a specific zinc salt, and thereby suppressing the amount of self-discharging. CONSTITUTION:Electrolyte consists of a water solution containing zinc bromide and certain zinc salts, which contain as neg. ions at least one of the NO, SO, SiF, CN<->, BF. The amount of self-discharging of battery is proportional to bromine concentration dissolved in positive electrode liquid except complex, but zinc bromide is added in an amount more than necessary for charging in order to prevent eccentricity of Zn ions in the electrolyte toward the pos. electrode liquid during normal charging and shortage of Zn ions in the neg. electrode liquid in the latest period of charging. Thus a large quantity of bromine ions are contained, so that complex ions with bromine are easily formed to cause increase of the amount of self-discharging. If therefore NO<-> and/or SO which lessens the free Br2 concentration is contained instead of Br<-> as zinc salt, the free Br2 concentration can be suppressed while lacking Zn<++> in the latest period of charging is compensated. This enhances the battery efficiency. |
