摘要
应用XRD和SEM分析手段,考察了煅烧温度对三氧化钼相变的影响,并对不同物相的三氧化钼进行了电化学性能测试。研究结果表明,三氧化钼粉末在煅烧温度约为400℃时发生了相转变,由六方相(h-MoO3)转变为正交相(α-MoO3),粉末形态由短棒状转变为细小碎片状。作为锂电池的正极活性物质,h-MoO3的首次最大放电比容量为171.4mA.h/g,循环20次后容量保持率为55.8%;α-MoO3的首次最大放电比容量为223.1mA.h/g,循环20次后容量保持率为60.6%,其电化学充放电性能与h-MoO3相比大幅提高。
The effects of calcination temperature on MoO3 phase transition were investigated by XRD and SEM,and the electrochemical performance of MoO3 in different phases as tested. The results show that phase transition of molybdenum trioxide powders occurs during calcination at about 400℃, from hexagonal phase （h-MoO3） to orthorhombic phase （α-MoO3）, and powder morphology changes from short rods to small fragments. Used as the positive electrode active material of lithium battery,the initial maximum dis- charge specific capacity of h MoO3 is 171.4 mA·h/g and its capacity retention is 55.8% after 20 cycles. The initial maximum discharge specific capacity of α-MoO3 is 223.1 mA·h/g and its capacity retention is 60.6% after 20 cycles. Therefore,the electrochemical performance of α-MoO3 is much better than h-MoO3
出处
《稀有金属与硬质合金》
CAS
CSCD
北大核心
2013年第3期24-27,共4页
Rare Metals and Cemented Carbides
基金
国家自然科学基金资助项目(50972039)
