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Issue 38, 2017
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Mg doped Li2FeSiO4/C nanocomposites synthesized by the solvothermal method for lithium ion batteries

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Abstract

A series of porous Li2Fe1−xMgxSiO4/C (x = 0, 0.01, 0.02, 0.04) nanocomposites (LFS/C, 1Mg-LFS/C, 2Mg-LFS and 4Mg-LFS/C) have been synthesized via a solvo-thermal method using the Pluronic P123 polymer as an in situ carbon source. Rietveld refinement of the X-ray diffraction data of Li2Fe1−xMgxSiO4/C composites confirms the formation of the monoclinic P21 structure of Li2FeSiO4. The addition of Mg facilitates the growth of impurity-free Li2FeSiO4 with increased crystallinity and particle size. Despite having the same percentage of carbon content (∼15 wt%) in all the samples, the 1Mg-LFS/C nanocomposite delivered the highest initial discharge capacity of 278 mA h g−1 (∼84% of the theoretical capacity) at the C/30 rate and also exhibited the best rate capability and cycle stability (94% retention after 100 charge–discharge cycles at 1C). This is attributed to its large surface area with a narrow pore size distribution and a lower charge transfer resistance with enhanced Li-ion diffusion coefficient compared to other nanocomposites.

Graphical abstract: Mg doped Li2FeSiO4/C nanocomposites synthesized by the solvothermal method for lithium ion batteries

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Publication details

The article was received on 28 Aug 2017, accepted on 01 Sep 2017 and first published on 04 Sep 2017


Article type: Paper
DOI: 10.1039/C7DT03177G
Citation: Dalton Trans., 2017,46, 12908-12915
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    Mg doped Li2FeSiO4/C nanocomposites synthesized by the solvothermal method for lithium ion batteries

    A. Kumar, O. D. Jayakumar, Jagannath, P. Bashiri, G. A. Nazri, Vaman. M. Naik and R. Naik, Dalton Trans., 2017, 46, 12908
    DOI: 10.1039/C7DT03177G

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