碳热还原合成SnSb合金负极材料的电化学性能

Electrochemical Properties of SnSb Alloy Anode Materials Synthesized by Carbothermal Reduction

以锡和锑的氧化物为原料,采用碳热还原法,制备了锂离子电池用微米级球形SnSb合金负极材料。材料表现出较低的首次不可逆容量和较好的循环性能。首次不可逆比容量为160mAh/g,可逆比容量达650mAh/g。其较低的比表面积是其较低的首次不可逆容量的主要原因,而颗粒的多晶特性则有利于电极材料循环稳定性的提高。同时采用循环伏安和交流阻抗测试研究了SnSb合金的电极反应过程。

Anode materials of microcrystalline spherical SnSb alloy for lithium-ion batteries were synthesized from tin and antimony oxides by carbothermal reduction. The so-prepared electrode shows a low initial irreversible capacity and good cycling performance. The initial capacity loss and reversible capacities are 160 mAh/g and 650 mAh/g, respectively. The relatively low specific surface area of SnSb particles should be responsible for the low initial irreversible capacity, while the polycrystalline characteristics of SnSb particles is apparently favorable for the improvement of cyclieability of SnSb electrode. The electrochemical reaction process of SnSb alloy electrode was characterized by cyclic voltammetry and AC impedance techniques.