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Effect of Nb-doping on electrochemical stability of Li4Ti5O12 discharged to 0 V

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Abstract

Li4Ti4.95Nb0.05O12 is synthesized by a citric acid-assistant sol–gel method. X-ray diffraction (XRD) reveals that highly crystalline Li4Ti4.95Nb0.05O12 without any impurity is obtained. The electrochemical performances of the Li4Ti4.95Nb0.05O12 and the Li4Ti5O12 in the range from 0 to 2.5 V are investigated. The Li4Ti4.95Nb0.05O12 presents a higher specific capacity and better cycling stability than the Li4Ti5O12 due to the improved conductivity. The Li4Ti4.95Nb0.05O12 exhibits a capacity as high as 231.2 mAh g−1 after 100 cycles, which is much higher than the Li4Ti5O12 (111.1 mAh g−1). The effect of Nb-doping on electrochemical performance of Li4Ti5O12 discharged to 0 V has also been discussed.

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Acknowledgments

This work was supported by National Science Foundation of China (grant no. 21006033), Program for New Century Excellent Talents in Chinese Ministry of Education (No. NECT-07-0307) and the Fundamental Research Funds for the Central Universities, SCUT (2009220038).

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Authors and Affiliations

  1. School of Chemistry & Chemical Engineering, South China University of Technology, Wushan Road, Guangzhou, 510640, China

    Bingbing Tian, Hongfa Xiang, Le Zhang & Haihui Wang

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  1. Bingbing Tian
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  2. Hongfa Xiang
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  3. Le Zhang
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  4. Haihui Wang
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Correspondence to Haihui Wang.

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Tian, B., Xiang, H., Zhang, L. et al. Effect of Nb-doping on electrochemical stability of Li4Ti5O12 discharged to 0 V. J Solid State Electrochem 16, 205–211 (2012). https://doi.org/10.1007/s10008-011-1305-z

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  • DOI: https://doi.org/10.1007/s10008-011-1305-z

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