锡铜锌氧合金负极材料的电化学性能

Electrochemical performance of the Cu-Sn-Zn-O alloy anode materials

采用两步脉冲电镀和低温热处理相结合的方法制备了锡铜锌氧合金;采用充放电循环、循环伏安、X射线粉末衍射、电镜、能谱等现代技术研究了样品的电化学性能与制备条件的关系.实验结果表明:当铜膜上电镀锡层与电镀锌层均用时2min时,制备的样品以100mA/g的电流在1.7～0.01V充放电时,首次放电容量为525mAh/g.30循环的库仑效率均高于90%,这对于寻找匹配的正极材料十分有利.

Sn-Cu-Zn-O alloys were prepared by two-step pulse-electroplating and heat treatment process at low temperature. Charge-discharge cycles, cyclic voltammogram, SEM, EDAX and other advanced techniques were employed to study the electrochemical performances of the as-prepared samples. The experimental results indicate that the alloy sample prepared by plated Tin and Zinc layers for two minutes respectively shows the best electrochemical performance in all samples. The initial capacity of the as-prepared sample is 525 mAh/g at a current of 100 mA/g in the voltage range of 1.7 to 0.01 V（ vs. Li ^＋/Li）. During the 30 cycles, the column efficiency of the as-prepared sample is as hither as 90%. which is benefit for selection of cathode materials.