镍电极电化学性能研究——电镀钴层和添加二氧化锰的影响  

Study on electrochemical characteristics of pasted nickel electrodes——Effects of cobalt plating and MnO_2 addition

作　　者：郑辅养[1] 余兴增[1] 蔡长寿[1] 

机构地区：[1]中国科学院福建物质结构研究所二部,福建厦门361012

出　　处：《电源技术》2002年第4期284-287,共4页Chinese Journal of Power Sources

基　　金：福建省自然科学基金 (E 991 0 0 2 9)

摘　　要：通过充放电曲线和交流阻抗谱的测定及循环伏安试验 ,探讨了添加二氧化锰和在镍箔上电镀钴层对氢氧化镍粉末压制的镍电极性能的影响。结果表明 ,镍箔上的镀钴层在充电过程中可被氧化为导电性良好的CoOOH ,为氢氧化镍粒子与镍基体之间提供良好的电子通道 ,CoOOH也可通过迁移、扩散 ,在氢氧化镍粒子之间提供良好的电子通道 ,从而降低电极的扩散电阻 ,增加其质子导电性 ,提高Ni(OH) 2 /NiOOH的氧化还原可逆性 ,提高活性物质的利用率及镍电极的放电容量 ;而二氧化锰和钴镀层的协同作用可进一步提高电极的扩散传质性能 。The effect of adding MnO 2 and plating cobalt on the performance of nickel electrode made of Ni(OH) 2 powder was discussed by means of charge/discharge curve, impedance spectroscopy and cyclic voltammetry. The results show that the cobalt being plated on nickel electrode can be oxided to CoOOH with high conductivity during charge, which provide good electronic channels between Ni(OH) 2 particle and nickel base. The CoOOH can also provide good electronic channels between Ni(OH) 2 particles, which is favorable to decrease the diffusion resistance of electrode, increase its proton conductivity, improve the reversibility of redox of Ni(OH) 2/NiOOH, enhance the utilization of active material and increase the discharge capacity of nickel electrode. In addition, the diffusive proton transfer property, capacity and capacity retention of electrode are improved obviously by the cooperative of MnO 2 and cobalt plating.

关 键 词：碱性蓄电池 镍奄极 电化学性能 电镀钴层 二氧化锰 

分 类 号：TM912.2[电气工程—电力电子与电力传动]