无机有机复合材料Bi_2Te_3/PAn电化学嵌锂性能研究

Study on the Insertion Behaviors of Lithium-Ions into Bi_2 Te_3 /Polyaniline Composites Electrodes

采用机械共混法制备了复合材料Bi2Te3/PAn,并对其电化学嵌锂性能进行了研究.研究发现Bi2Te3/PAn快速充放电性能良好,在以100 mA·g-1的电流密度充放电时首次可逆容量为480 mAh·g-1,到第20个循环时容量保持在200mAh·g-1.通过非原位X射线衍射方法研究其嵌锂机理,发现Bi2Te3在首次放电时分解,在随后的循环中以Te和Bi为嵌锂中心进行可逆储锂.

Bi2Te3/polyaniline composites were prepared by mechanical blending and the electrochemical properties were studied with lithium anode model cell Li|LiPF6(EC+DMC) |Bi2Te3/PAn. A reversible capacity of about 480mAhg(-1) has been obtained in the first cycle. The reversible capacity keeps about 200 mAhg(-1) in the first 20 cycles. The mechanism of lithium insertion into Bi2Te3/PAn was analyzed by ex situ XRD.