Open Conference Systems, International Conference on Electrochemical Energy and Technology

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Synthesis and electrochemical performance of TiO2-graphene nanocomposite for high-rate application of lithium ion batteries
Chuchun Zheng, Haiyan Zhang, Chunhua He, Yiming Chen, Shaozhen Huang, Yingxi Lin

Last modified: 2014-10-15

Abstract


TiO2-graphene nanocomposite (term as TGC) was synthesized by a facile gas/liquid interface reaction. The structure and morphology were characterized by X-ray diffraction and scanning electron microscopy. The result shows that a unique nanocomposite is obtained with the TiO2 nanoparticles homogenously dispersed onto the graphene sheets. The electrochemistry performance was tested through cyclic voltammetry, constant current discharge/charge tests and electrochemical impedance techniques. The initial lithium ion storage capacity is 398 mAhg-1 at the rate of 10 mAg-1, which exceeds the theoretical capacity value of the anatase TiO2 (335 mAhg-1). The nanocomposite exhibits remarkable high-rate reversible capacity of 158.1 mAhg-1 after 100 cycles at the rate of 1000 mAg-1. In cycling test at the rate of 1000 mAg-1 after 100 cycles, the coulombic efficiency is higher than 96% and continually increased to near 100%. The high specific capacity and good stability can be attributed to the unique structures of the TGC, and makes the nanocomposite a promising substitute of the current commercial graphite anode in high-power, high-rate application of lithium ion batteries.


Keywords


graphene; TiO2; nanocomposite; lithium-ion battery

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