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In situ synthesis of Fe(1−x)Co x F3/MWCNT nanocomposites with excellent electrochemical performance for lithium-ion batteries

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Abstract

Due to their high theoretical capacities and high energy densities, metal fluorides have attracted significant attention as cathodes for lithium-ion batteries. However, thus far, their low conductivities have limited the performance of these materials. In this work, the Fe(1−x)Co x F3/MWCNT (multi-walled carbon nanotube) nanocomposites (x = 0, 0.02, 0.04 and 0.06) are obtained by an in situ solvothermal method with Co-doping and wrapping of the MWCNTs. The results indicate that Co-doping can adjust the crystal structure, decrease the band gaps and enhance the Li+ diffusion coefficient of FeF3. Additionally, the wrapped network of MWCNTs enhances the conductivity of the composites and improves their electrochemical performances. The Fe0.96Co0.04F3/MWCNT nanocomposites exhibit a high initial discharge capacity of 217.0 mAh g−1 at rate of 0.2 C within the potential range of 2.0–4.5 V, which is much higher than that of the FeF3/MWCNT counterpart (192.1 mAh g−1). The discharge capacities of these two samples remain at 187.9 and 160.7 mAh g−1 even after 50 cycles. Meanwhile, the EIS results reveal that both the Li+ charge transfer resistance (R ct = 31.25 Ω) and Li+ diffusion coefficient (1.40 × 10−11 cm2 s−1) are satisfactory from Co-doping and the in situ wrapping of the MWCNTs.

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Acknowledgements

This work is supported by Science and Technology Plan Foundation of Guangdong (2015A050502046) and Science and Technology Plan Foundation of Guangzhou (201704030031).

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Authors and Affiliations

  1. Faculty of Chemical Engineering and Light Industry, Guangdong University of Technology, No. 100 Waihuan Xi Road, Guangzhou Higher Education Mega Center, Panyu District, Guangzhou, Guangdong, 510006, China

    Jun Li, Shuaijun Xu, Si Huang, Lu Lu, Lifang Lan & Shaofang Li

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  1. Jun Li
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  2. Shuaijun Xu
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  3. Si Huang
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  4. Lu Lu
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  5. Lifang Lan
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Correspondence to Jun Li.

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Li, J., Xu, S., Huang, S. et al. In situ synthesis of Fe(1−x)Co x F3/MWCNT nanocomposites with excellent electrochemical performance for lithium-ion batteries. J Mater Sci 53, 2697–2708 (2018). https://doi.org/10.1007/s10853-017-1685-2

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