添加剂对氢氧化镍电位性能的影响

Effect of Additives on Potential Performance of Nickel Hydroxide

通过对添加Co、Co +Zn、Co +Cd及不含添加剂的氢氧化镍样品进行粉末微电极循环伏安测试 ,研究了氢氧化镍的电位性能 ,并对这些样品进行物理形态结构测试 ,探索了添加剂对氢氧化镍物理形态结构及电位性能的影响。结果表明 :在制备氢氧化镍时加入添加剂 ,氢氧化镍的颗粒小 ,BET比表面大 ,组成颗粒微晶小 ,微晶间孔隙丰富 ,XRD图谱中 (0 0 1)晶面和 (10 1)晶面衍射峰的半高宽 (FWHM )值和d0 0 1 值较大 ,结合水含量增多 ,这些结构上的变化有利于氢氧化镍充放电过程中质子扩散 ,从而改善其电位性能 ;单纯添加Co对改善氢氧化镍的充电电位性能效果较好 ,而同时加Co、Zn或Co。

The potential performance of nickel hydroxides with and without additives of cobalt, zinc, cadmium was investigated by using powder microelectrode voltammetry and the physical structural properties of these samples were determined by SEM, XRD, TGA, BET, to explore the relationship of dopants with structure and potential performance. The results demonstrate that addition of the additives to nickel hydroxide during its preparation can results in its smaller particle size, larger BET specific surface, finer micro-crystal grains, wider FWHM of (001) and (101) face, and larger interplaner space of (001) face. These changes in structure are beneficial to the diffusion of proton during charge and discharge of nickel hydroxide, improving the potential performance. Nickel hydroxide with only cobalt has better charge potential performance. Simultaneous addition of cobalt and zinc or cobalt and cadmium results in a great improvement in charge and discharge potential performance.