摘要
采用化学反应共沉淀法制备出Zn2+和PO43-阴阳离子复合掺杂的α-Ni(OH)2粉体材料。通过对其微结构表征和电化学性能的测试分析结果表明,随着阳离子Zn2+含量相对增加,阴离子PO43-含量相对减少,晶胞参数a和c逐渐增大,当把掺入Zn2+,PO43-的摩尔百分比为23.4%,5.21%时的α-Ni(OH)2样品作为MH-Ni电池的正极活性材料时,电化学阻抗和扩散电阻较小,电池在以80 mA/g恒电流充电5 h,40 mA/g恒电流放电,终止电压为1.0 V的充放电制度下,具有1.34 V较高的放电中值电压,放电比容量为335.31 mA.h.g-1,而且在强碱溶液中稳定存在,30次充放电循环后没有相变化,放电比容量保持率为94%。
By the method of chemical co-precipitation,the microstructral research and electrochemical performance tests discovered that the value of a aix and c becoming bigger with rising Zn2+content and lowing PO43-content,when the mole ratio of PO43-and Zn2+ in the sample material respectively were 5.21% and 23.4%,the sample was made as the nickel electrode active material,to assemble MH-Ni simulation battery,electrochemical impedance and diffusing impedance are much smaller,at the rate 80 mA/g charged for 5 h under contant current,discharge at rate 40 mA/g,the final voltage was controlled at the 1.0 V,the electrode material was stable in the strong alkia solution and during the charging and discharging 30 times circulations,whose discharge platform 1.34 V was higher,the discharge specific capacity reached 335.31 mAh/g,the rate of sustaining specific capacity was 94%.
出处
《微细加工技术》
2008年第6期37-40,共4页
Microfabrication Technology
基金
广西科学研究与技术开发计划项目资助(桂科基0731001)
