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A PEG-assisted rheological phase reaction synthesis of 5LiFePO4⋅Li3V2(PO4)3/C as cathode material for lithium ion cells

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Abstract

5LiFePO4⋅Li3V2(PO4)3/C composite cathode material is synthesized by a polyethylene glycol (PEG)-assisted rheological phase method. As a surfactant and dispersing agent, PEG can effectively inhabit the aggregation of colloidal particles during the formation of the gel. Meanwhile, PEG will coat on the particles to play the role of carbon source during the sintering. The samples are characterized by X-ray diffraction (XRD), scanning electron microscopy, and electrochemical methods. XRD results indicate that the 5LiFePO4⋅Li3V2(PO4)3/C composites are well crystallized and contain olivine-type LiFePO4 and monoclinic Li3V2(PO4)3 phases. The composite synthesized at 650 °C exhibits the initial discharge capacities of 134.8 and 129.9 mAh g−1 and the capacity retentions of 96.2 and 97.1 % after 50 cycles at 1C and 2C rates, respectively.

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Acknowledgment

This study was supported by the National Natural Science Foundation of China (51164007).

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Authors and Affiliations

  1. Shagang school of Iron and Steel, Soochow University, Suzhou, 215021, China

    Shengkui Zhong, Ling Wu & Jiequn Liu

  2. College of Chemistry and Bioengineering, Guilin University of Technology, Guilin, 541004, China

    Shengkui Zhong & Wei Chen

Authors
  1. Shengkui Zhong
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  2. Wei Chen
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  3. Ling Wu
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  4. Jiequn Liu
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Correspondence to Ling Wu.

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Zhong, S., Chen, W., Wu, L. et al. A PEG-assisted rheological phase reaction synthesis of 5LiFePO4⋅Li3V2(PO4)3/C as cathode material for lithium ion cells. Ionics 18, 523–527 (2012). https://doi.org/10.1007/s11581-012-0701-4

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