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Synthesis of Li4Ti5O12 fibers as a high-rate electrode material for lithium-ion batteries

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Abstract

Porous lithium titanate (Li4Ti5O12) fibers, composed of interconnected nanoparticles, are synthesized by thermally treating electrospun precursor fibers and utilized as an energy storage material for rechargeable lithium-ion batteries. The material is characterized by X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, and thermal analysis. Scanning electron microscopy results show that the Li4Ti5O12 fibers calcined at 700 °C have an average diameter of 230 nm. Especially, the individual fiber is composed of nanoparticles with an average diameter of 47.5 nm. Electrochemical properties of the material are evaluated using cyclic voltammetry, galvanostatic cycling, and electrochemical impedance spectroscopy. The results show that as-prepared Li4Ti5O12 exhibits good cycling capacity and rate capability. At the charge–discharge rate of 0.2, 0.5, 1, 2, 10, 20, 40, and 60 C, its discharge capacities are 172.4, 168.2, 163.3, 155.9, 138.7, 123.4, 108.8, and 90.4 mAh g−1, respectively. After 300 cycles at 20 C, it remained at 120.1 mAh g−1. The obtained results thus strongly support that the electrospun Li4Ti5O12 fibers could be one of the most promising candidate anode materials for lithium-ion batteries in electric vehicles.

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Acknowledgments

This work was financially sponsored by the National Post-Doctoral Fund of China (no. 20090461013), the postdoctoral fund of Xiangtan University, and the Open Fund from Key Laboratory of Advanced Functional Polymeric Materials of Hunan Province (no. AFPM200906), the project of Science and Technology of Hunan Province (no. 2010RS4012).

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Authors and Affiliations

  1. College of Civil Engineering & Mechanics, Xiangtan University, Xiangtan, Hunan, 411105, China

    Qizhen Xiao & Ping Zhang

  2. Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan, Hunan, 411105, China

    Li Wang, Qizhen Xiao, Zhaohui Li, Gangtie Lei & Lijuan Wu

  3. College of Chemistry, Xiangtan University, Xiangtan, Hunan, 411105, China

    Qizhen Xiao

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  1. Li Wang
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  2. Qizhen Xiao
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Correspondence to Qizhen Xiao or Ping Zhang.

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Wang, L., Xiao, Q., Li, Z. et al. Synthesis of Li4Ti5O12 fibers as a high-rate electrode material for lithium-ion batteries. J Solid State Electrochem 16, 3307–3313 (2012). https://doi.org/10.1007/s10008-012-1776-6

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  • DOI: https://doi.org/10.1007/s10008-012-1776-6

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