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Electrochemical performance of modified artificial graphite as anode material for lithium ion batteries

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Abstract

Artificial graphite anode material was modified by coating an amorphous carbon layer on the particle surface via a sol-gel and pyrolysis route. The electrochemical measurements demonstrate that appropriate carbon coating can increase the specific capacity and the initial coulombic efficiency of the graphite material, while excessive carbon coating leads to the decrease in specific capacity. Thick coating layer is obviously unfavorable for the lithium ion diffusion due to the increased diffusion distance, but the decreased specific surface area caused by carbon coating is beneficial to the decrease of initial irreversible capacity loss. The sample coated with 5 wt.% glucose exhibits a stable specific capacity of 340 mAhg−1. Carbon coating can remarkably enhance the rate capability of the graphite anode material, which is mainly attributed to the increased diffusion coefficient of lithium ion.

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Acknowledgments

This work was supported by Program for Guangdong Industry-Academy-Alliance Research (2009A090100020) and Program for New Century Excellent Talents in University of China (NCET-07-0072).

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Authors and Affiliations

  1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Chunmei Wang, Hailei Zhao, Jing Wang, Jie Wang & Pengpeng Lv

  2. Beijing Key Lab of New Energy Materials and Technology, Beijing, 100083, China

    Hailei Zhao

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  1. Chunmei Wang
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  2. Hailei Zhao
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  3. Jing Wang
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  4. Jie Wang
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  5. Pengpeng Lv
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Correspondence to Hailei Zhao.

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Wang, C., Zhao, H., Wang, J. et al. Electrochemical performance of modified artificial graphite as anode material for lithium ion batteries. Ionics 19, 221–226 (2013). https://doi.org/10.1007/s11581-012-0733-9

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  • DOI: https://doi.org/10.1007/s11581-012-0733-9

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