摘要
利用恒电流充放电、循环伏安法研究了过量镍粉对Ni(OH)2电极电化学行为的影响,并用X射线衍射分析了放电后镍粉结构的变化。结果表明:电极中的镍粉在碱性电解液中会氧化成活性物质β-Ni(OH)2,从而对放电容量作出贡献,同时因氧化使导电性降低而影响Ni(OH)2的放电效率。利用镍粉作空白试验对照,将电极在第4～6周期的放电容量扣除镍粉的贡献可尽量准确地测定Ni(OH)2的放电容量。
The effects of nickel powders on the electrochemical performance of Ni （OH）2 electrode were studied by constant charge/discharge, cyclic voltammetry （CV） . And the structure changes of the nickel powders during charge/discharge were characterized with X-ray diffraction （XRD）. The results showed that the nickel powder was oxidized into β-Ni （OH）2 in alkaline solution which made contribution to the discharge capacity of the electrode. At the same time, the oxidization decreased the conductivity of the nickel powders and reduce the discharging effect of the electrode. It was suggested that the specific capacity of Ni （OH）2 could be corrected by excluding the contribution of the nickel powder at the 4th to 6th charging-discharging cycles to obtain a precise discharge capacity.
出处
《电池工业》
CAS
2008年第4期229-232,共4页
Chinese Battery Industry
基金
国家自然科学基金重点项目(50134020)
关键词
Ni(On)2电极
镍粉
放电比容量
循环伏安法
结构表征
Ni（OH）2 electrode
nickel powders
specific discharge capacity
cyclic voltammetry
structure characterization
