摘要
为了提高二氧化锰在碱性锌锰电池中的放电性能,利用二氧化硅模板通过水热法合成了具有高表面积的介孔二氧化锰,并通过镍离子的掺杂进一步改进其性能。采用扫描电镜(SEM)、透射电镜(TEM)、X射线衍射仪(XRD)和全自动氮吸附比表面仪对样品进行了检测,电化学结果表明:镍掺杂5%的样品放电性能最佳,其比表面积高达115.45 m2/g,平均孔径为14.26 nm。在250mA/g电流密度下恒电流放电容量为359.5 mAh/g,与电解二氧化锰(EMD)相比,放电性能提高244.3%。
In order to enhance the discharge capability of manganese dioxide in alkaline Zn/MnO2 batteries, we use silicon dioxide as a template to synthesis high specific surface mesoporous MnO2 through hydrothermal route, and use nickel doping technique to improve its discharge performance. XRD, SEM, TEM and nitrogen adsorption analysis techniques are used for the structural characterization. The electrochemical results show that 5% Nidoped mesoporous MnO2 has the best discharge capability. The sample has a surface area of 115.45 m2/g and the average pore diameter is 14.26 nm. Under the constant discharge currents of 250 mA/g, the discharge capacity is 359.5 mAh/g. Compared to the commercial electrolytic manganese dioxide （EMD）, the discharge capacity of the sample is increased by 244.3%.
出处
《中国锰业》
2009年第4期9-12,共4页
China Manganese Industry
基金
国家自然科学基金(基金号50904054)
关键词
二氧化锰
镍掺杂
介孔结构
放电性能
Manganese dioxide
Nickel doping
Mesoporous structure
Discharge capacity
