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Comparative investigations of LiVPO4F/C and Li3V2(PO4)3/C synthesized in similar soft chemical route

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Abstract

Triclinic LiVPO4F and monoclinic Li3V2(PO4)3 are synthesized through a soft chemical process with mechanical activation assist, followed by annealing. In this process, ascorbic acid is used as reducing agent as well as carbon source. The as-prepared samples are coated with amorphous carbon. XPS analysis results show the expected valency states of ions in LiVPO4F and Li3V2(PO4)3. The electrochemical properties of the prepared LiVPO4F/C and Li3V2(PO4)3/C cathodes are evaluated. The as-prepared LiVPO4F/C cathode shows an initial discharge specific capacity of 140 ± 3 mAh g−1 at 30 mA g−1 in the voltage range of 3.0~4.4 V, compared with that of 138 ± 3 mAh g−1 possessed by Li3V2(PO4)3/C. Both samples exhibit good cycle performance at different current densities. The capacity delivered by LiVPO4F remains 95.5 and 91.7 % of its initial discharge capacity after 50 cycles at 150 and 750 mA g−1, respectively, while 97.4 and 90.6 % for Li3V2(PO4)3/C. But the rate capability of LiVPO4F/C is not so good compared with as-prepared Li3V2(PO4)3/C.

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Acknowledgments

This study was supported by Major Special Project of Science and Technology of Hunan Province, China (Grant No.2011FJ1005), Innovation Project of Academic Dissertation for Graduate Students of Central South University (No. 2011ssxt246).

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Authors and Affiliations

  1. School of Metallurgical Science and Engineering, Central South University, Changsha, 410083, China

    Jiexi Wang, Zhixing Wang, Xinhai Li, Huajun Guo, Wei Xiao, Silin Huang & Zhenjiang He

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  1. Jiexi Wang
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  2. Zhixing Wang
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  3. Xinhai Li
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  4. Huajun Guo
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  5. Wei Xiao
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Correspondence to Zhixing Wang.

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Wang, J., Wang, Z., Li, X. et al. Comparative investigations of LiVPO4F/C and Li3V2(PO4)3/C synthesized in similar soft chemical route. J Solid State Electrochem 17, 1–8 (2013). https://doi.org/10.1007/s10008-012-1846-9

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  • DOI: https://doi.org/10.1007/s10008-012-1846-9

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