Effect of Overcharge on Electrochemical Performance of Sealed-Type Nickel/Metal Hydride Batteries

被引：0
作者：
李丽
吴锋
陈人杰
陈实
机构：
[1] School of Chemical Engineering and Environment Beijing Institute of Technology Beijing100081 China
[2] School of Chemical Engineering and Environment Beijing Institute of Technology Beijing100081 China
来源：
Journal of Beijing Institute of Technology | 2005年 / 04期
关键词：
nickel/metal hydride batteries; overcharge; inner pressure; degradation mechanism;
D O I：
10.15918/j.jbit1004-0579.2005.04.019
中图分类号：
TM911 [化学电源、电池、燃料电池];
学科分类号：
0808 ;
摘要：
The effects of overcharge on electrochemical performance of AA size sealed-type nickel/metal hydride(Ni/MH) batteries and its degradation mechanism were investigated. The results indicated that the relationship between the effects of different overcharge currents on the increasing velocity of inner pressure and the degradation velocity of cycle life and discharge voltage remains in almost direct proportion. After overcharge cycles, the positive electrode materials remain the original structure, but there occur some breaks because of the irreversible expand of crystal lattice. And the negative electrode alloy particles have inconspicuous pulverization, but are covered with lots of corrosive products and its main component is rare earth hydroxide or oxide. These are all the main reasons leading to the degradation behavior of the discharge capacity and cycle life of Ni/MH batteries.
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收藏
页码：438 / 441
页数：4
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