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Effects of Li3PO4 additive on the electrochemical properties of Li2FeSiO4 as cathode material for lithium-ion batteries

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Abstract

Li2FeSiO4/C is successfully modified by Li3PO4 additive to achieve excellent electrochemical properties. In comparison with bare Li2FeSiO4/C, the samples with Li3PO4 show no changes in the morphology and structure, which are verified by X-ray powder diffraction and scanning electron microscopy results. High resolution transmission electron microscopy image confirms that Li2FeSiO4/C and Li3PO4 exist in the form of nanocomposites. When used as LIB cathodes, the Li2FeSiO4/Li3PO4/C composites show notably improved electrochemical performance with outstanding high rate performance and superior cyclability than those of Li2FeSiO4/C. The sample with 6 mmol% (LFS-6) exhibits a large discharge capacity of 114.1 mAh g−1 with a remarkable capacity retention of 104.2% over 100 cycles at 10 C, which are much better than those of Li2FeSiO4/C (89.0 mAh g−1 and capacity retention of 75.9%). The enhancement in the electrochemical properties of Li2FeSiO4/C may be attributed to the existence of Li3PO4 additive with high ionic conductivity, which can accelerate the lithium ions diffusion capability and facilitate the charge transfer process.

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Acknowledgements

This investigation is supported by National Science Foundation of China (Grant No. 21271145), the National Science Foundation of Hubei Province (Grant No. 2015CFB537) and the Science and Technology Innovation Committee of Shenzhen Municipality (contract NO. JCYJ20170306171321438).

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  1. College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China

    Ya Sun, Ling Zan & Youxiang Zhang

  2. Shenzhen Research Institute of Wuhan University, Shenzhen, 518000, China

    Youxiang Zhang

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Sun, Y., Zan, L. & Zhang, Y. Effects of Li3PO4 additive on the electrochemical properties of Li2FeSiO4 as cathode material for lithium-ion batteries. J Mater Sci: Mater Electron 30, 15582–15591 (2019). https://doi.org/10.1007/s10854-019-01934-5

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