电极
钴
循环伏安法
镍
价(化学)
氢氧化钴
材料科学
氢氧化物
无机化学
化学工程
化学
电化学
冶金
物理化学
有机化学
工程类
作者
Zhaorong Chang,LI Hua-ji,Hongwei Tang,Xiao Zi Yuan,Haijiang Wang
标识
DOI:10.1016/j.ijhydene.2009.01.033
摘要
High-valence (3.40) cobalt compounds were synthesized by a chemical precipitation (CP) method. Nickel hydroxide electrodes were then prepared using the synthesized compounds as conducting agents. The effects of high-valence cobalt additions on electrode properties, such as charge–discharge characteristics, electrode reaction reversibility, and cyclic voltammetric performance, were investigated by cyclic voltammetry, X-ray diffraction (XRD), and resistance measurement. The results demonstrate that the addition of high-valence cobalt helps to form a conductive network in the electrode, thus greatly increasing the cycling performance and simultaneously accomplishing an extremely high utilization of the active material in the positive electrode. For comparison, active materials of Co(OH)2, β-CoOOH, and CoO were also included in the test. It was found that cobalt with a valence of 3.40 has a higher performance within one cycle. The utilization of the active material can reach 100.6% at a discharge rate of 0.2 C.
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