Preparation and Electrochemical Lithium Insertion of TiO2/Graphene Nanocomposites

doi:10.15541/jim20150172

Abstract

Abstract:

TiO₂/Graphene nanocomposites was synthesized through solvothermal method with butyl titanate as TiO₂precursor. The character of nanocomposites was measured by scanning electron microscope (SEM), thermogravimetry (TG), X-ray diffraction (XRD) and electrochemical measurements. The result shows that TiO₂nanoparticles are uniformly wrapped in the graphene sheets. The graphene content of TiO₂/Graphene nanocomposite is 24.67wt%. When the TiO₂/Graphene nanocomposites are used as anode materials for lithium-ion battery, the initial discharge capacity of the nanocomposite electrode is 384.35 mAh/g at a current rate of 2C. It delivers a capacity of 130.26 mAh/g after 100 charge-discharge cycles, 2.93 times as high as that of the pure TiO₂ nanoparticles electrode_. The charge transfer resistance of the nanocomposites is lower than that of TiO₂. The nanocomposite electrode exhibits good rate capability and excellent electrochemical performance as compared with the pure TiO₂ electrode.

Key words: lithium ion battery, a anode material, TiO2, nanocomposite

CLC Number:

O646

CUI Yu, WANG Yan-Zhi, CHEN Zhao-Fan. Preparation and Electrochemical Lithium Insertion of TiO₂/Graphene Nanocomposites[J]. Journal of Inorganic Materials, 2015, 30(11): 1218-1222.

Figures/Tables 4

Fig. 1 XRD patterns (a) and TG curves (b) of TiO2/Graphene nanocomposites

Fig. 2 SEM (a) and TEM (b) images of TiO2/Graphene nanocomposites

Fig. 3 Discharge capacity and charge capacity (a), cycle voltammograms (b), cycle stability (c), rate performance (d) of pure TiO2 and TiO2/graphene nanocomposites electrodes

Fig. 4 Corresponding equivalent circuit and impedance spectra of pure TiO2 and TiO2/Graphene nanocomposites electrodes tested at 2C rate after 3 cycles

References 12

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Preparation and Electrochemical Lithium Insertion of TiO₂/Graphene Nanocomposites

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