TiO2-reduced graphene oxide nanocomposite for high-rate application of lithium ion batteries
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- 作者：Chuchun Zheng ; Chunhua He ; Haiyan Zhang ; Wenguang Wang ; Xinling Lei
- 关键词：Reduced graphene oxide ; TiO2 ; Nanocomposite ; Lithium ; ion battery
- 刊名：Ionics
- 出版年：2015
- 出版时间：January 2015
- 年：2015
- 卷：21
- 期：1
- 页码：51-58
- 全文大小：1,941 KB
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文摘
TiO2-reduced graphene oxide nanocomposite has been synthesized by a facile hydrothermal process. The structure and morphology have been characterized by X-ray diffraction and scanning electron microscopy. The result shows that a unique nanocomposite has been obtained with the TiO2 nanoparticle homogenously dispersed onto the reduced graphene oxide sheets. The electrochemistry performance has been tested through cyclic voltammetry, constant current discharge/charge tests, and electrochemical impedance techniques. The initial lithium ion storage capacity is 368?mAhg? at the rate of 10?mAg?, which exceeds the theoretical capacity value of the anatase TiO2 (335?mAhg?). The nanocomposite exhibits good high-rate capacity of 136.1?mAhg? at rate of 1,000?mAg?, and, after 100?cycles, the coulombic efficiency is still maintained as high as 98.6?%. The high specific capacity and good stability can be attributed to the unique structures and make the nanocomposite a promising substitute of the current commercial graphite anode in high-power, high-rate application of lithium ion batteries.