钴及其化合物对镍电极放电容量和循环寿命的影响

研究了钴及几种钴化合物对泡沫式镍电极电化学性能的影响。实验表明 ,钴及钴化合物添加剂能明显提高镍电极的放电比容量和 1C循环寿命 ,其中添加金属钴粉能使镍电极在大电流充放电循环中保持较好的容量稳定性。添加乙酸钴镍电极 1C循环容量最高并具有好的循环稳定性。钴添加剂的作用主要是因为镍电极在充电活化时不可逆地形成导电性能良好的CoOOH ,增加了镍电极的导电性

Effects of cobalt and cobalt compounds on discharge capacity and cycle life of nickel electrodes

Effects of cobalt and several cobalt compound additives on the performance of nickel electrode were studied by means of galvanostatic charge/discharge curve and cycle life methods.The experimental results show that the specific discharge capacity of nickel electrode and its cycle life at 1C rate can be increased obviously by adding cobalt additives in.In particular,with the addition of metallic cobalt powder,the nickel electrode exhibits a good cycling durability at higher current.The electrode with cobalt acetate presents the top discharge capacity and good cycling durability at 1C rate.The beneficial effect of cobalt additive on nickel electrode is due to the formation of CoOOH,which performs good conductivity,during the first activation charge.