镍电极的固相掺杂及在非对称电容中的应用

Solid Adulterating in Nickel Electrodes and Its Application in Asymmetric Hybrid Capacitor

应用CoO、Zn粉对镍电极进行固相掺杂,电极经若干次充放电循环,Co、Zn元 素在Ni(OH)2颗粒表层以固溶体的形式富集,可优化活性物质表面的组成和结构,提高活性物 质表层的快速反应能力,从而使镍电极更适用于C／Ni(OH)2非对称电容器体系.实验结果表 明:在高倍率充放电条件下,掺杂10％CoO的镍电极,其容量为未掺杂电极的2倍;用5％的 Zn粉替代部分导电剂Ni粉,镍电极大电流条件下的循环性能和容量性质将明显改善.

For adulterating nickel electrode with CoO and Zn powders, layers of solid solute materials will be deposited on the surface of Ni(OH)(2) after several charge-discharge cycles. This can optimize the composing and configuration of active materials on surface of Ni(OH)(2). Thus the nickel electrode is more suitable to work in C/Ni(OH)(2) asymmetric hybrid capacitor system. This work shows that in high rate discharge condition, the capacity of the nickel electrode adulterated with 10% CoO is 2 times of the capacity of the no adulterating electrode. If electron conductor, Ni powder is substituted by 5% Zn powder in the electrode, the high power capacity and cycle performance of the nickel electrode can be improved.