电化学浸渍法制备空间氢镍电池用镍电极的循环寿命研究

以空间储能电源4.5＇镍极板为对象,研究了过充电、高倍率及极板孔径对电化学浸渍电极循环寿命的影响.结果表明,5C过充电70%,电极初始容量为2.7 Ah,150次循环后容量逐渐下降,300次循环,放电容量约为1.7 Ah（保持率约63%）.5C无过充电,300次循环其容量保持率约100%,1000次循环,容量保持率仍可达76%.无过充电,极板孔径及小电流活化均可改善电极循环性能.

Cycle Lifetime Investigation of Nickel Electrode Prepared by Electrochemical Impregnation for Application in Aerospace Nickel Hydrogen Cells

In this paper,the effects of overcharge,charge-discharge C rate and pore size on cycle lifetime of 4.5′ electrochemical impregnated nickel electrode were investigated.In the case of the electrode was overcharged to 170% of nominal capacity,the initial capacity of the electrode could be maintained 2.7 Ah up to 150 cycles without deterioration and a discharge capacity of 1.7 Ah(remaining 63% of 2.7 Ah) could be delivered after 300 cycles.Without overcharge,more than 300 charge-discharge cycles could be realized without loss of capacity and a discharge capacity of electrode could be maintained about 76% of initial capacity even after 1000 cycles.The experimental results also showed that without overcharge the increase in pore size and activation with small current could improve the electrode cycle capability.