Scalable Synthesis of TiO2/Graphene Nanostructured Composite with High-Rate Performance for Lithium Ion Batteries

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• 作者：Xing Xin ; Xufeng Zhou ; Jinghua Wu ; Xiayin Yao ; Zhaoping Liu
• 刊名：ACS Nano
• 出版年：2012
• 出版时间：December 21, 2012
• 年：2012
• 卷：6
• 期：12
• 页码：11035-11043
• 全文大小：565K
• 年卷期：v.6,no.12(December 21, 2012)
• ISSN：1936-086X

文摘

A simple and scalable method is developed to synthesize TiO₂/graphene nanostructured composites as high-performance anode materials for Li-ion batteries using hydroxyl titanium oxalate (HTO) as the intermediate for TiO₂. With assistance of a surfactant, amorphous HTO can condense as a flower-like nanostructure on graphene oxide (GO) sheets. By calcination, the HTO/GO nanocomposite can be converted to TiO₂/graphene nanocomposite with well preserved flower-like nanostructure. In the composite, TiO₂ nanoparticles with an ultrasmall size of several nanometers construct the porous flower-like nanostructure which strongly attached onto conductive graphene nanosheets. The TiO₂/graphene nanocomposite is able to deliver a capacity of 230 mA h g^鈥? at 0.1 C (corresponding to a current density of 17 mA g^鈥?), and demonstrates superior high-rate charge鈥揹ischarge capability and cycling stability at charge/discharge rates up to 50 C in a half cell configuration. Full cell measurement using the TiO₂/graphene as the anode material and spinel LiMnO₂ as the cathode material exhibit good high-rate performance and cycling stability, indicating that the TiO₂/graphene nanocomposite has a practical application potential in advanced Li-ion batteries.

Keywords:

Li-ion battery; titania; graphene; anode; nanocomposite