Effect of surface modification of metal hydride electrodeon performance of MH/Ni batteries

来源期刊：中国有色金属学报(英文版)2007年第1期

论文作者：杨凯 吴峰 陈实 张存中

文章页码：200 - 200

Key words：surface modification; vacuum evaporation plating technology; electrode; MH/Ni batteries

Abstract: A novel method was applied to the surface modification of the metal hydride(MH) electrode of MH/Ni batteries. Both sides of the electrode were plated with a thin silver film about 0.1μm thick using vacuum evaporation plating technology, and the effect of the electrode on the performance of MH/Ni batteries was examined. It is found that the surface modification can enhance the electrode conductivity and decrease the battery ohimic resistance. After surface modification, the discharge capacity at 5C (7.5A) is increased by 212 mA·h and the discharge voltage is increased by 0.11 V, the resistance of the batteries is also decreased by 32%. The batteries with modified electrode exhibit satisfactory durability. The remaining capacity of the modified batteries is 89% of the initial capacity even after 500 cycles. The inner pressure of the batteries during overcharging is lowered and the charging efficiency of the batteries is improved.

基金信息：the National Basic Research Program of China
the Fundamental Research of Beijing Institute of Technology