Preparation and characte rization of SnO₂-Li₄Ti₅O₁₂composite by sol-gel technique

来源期刊：中国有色金属学报(英文版)2010年增刊第1期

论文作者：熊利芝 何则强 尹周澜 陈启元

文章页码：267 - 270

Key words：SnO₂; Li₄Ti₅O₁₂; composite; sol-gel method; lithium ion batteries

Abstract: SnO₂-Li₄Ti₅O₁₂ was prepared by sol-gel method using tin tetrachloride, lithium acetate, tetrabutylorthotitanate and aqueous ammonia as starting materials. The composite was characterized by thermogravimertric (TG) analysis and differential thermal analysis (DTA), X-ray diffractometry (XRD) and transmission electron microscopy (TEM) combined with electrochemical tests. The results show that SnO₂-Li₄Ti₅O₁₂ composite derived by sol-gel technique is a nanocomposite with core-shell structure, and the amorphous Li₄Ti₅O₁₂ layer with 20-40 nm in thickness is coated on the surface of SnO₂ particles. Electrochemical tests show that SnO₂-Li₄Ti₅O₁₂ composite delivers a reversible capacity of 688.7 mA·h/g at 0.1C and 93.4% of that is retained after 60 cycles at 0.2C. The amorphous Li₄Ti₅O₁₂ in composite can accommodate the volume change of SnO₂ electrode and prevent the small and active Sn particles from aggregating into larger and inactive Sn clusters during the cycling effectively, and enhance the cycling stability of SnO₂ electrode significantly.

基金信息：the National Natural Science Foundation of China
the Postdoctoral Science Foundation of China
Hunan Provincial Natural Science Foundation of China
the Scientific Research Fund of Hunan Provincial Education Department
Postdoctoral Science Foundation of Central South University