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Issue 14, 2018
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Fast Li+ diffusion in interlayer-expanded vanadium disulfide nanosheets for Li+/Mg2+ hybrid-ion batteries

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Abstract

Li+/Mg2+ hybrid-ion batteries (LMIBs) have attracted intensive attention because they can circumvent some serious drawbacks of Li- and Mg-rechargeable batteries. In this work, a novel LMIB was proposed that uses a VS2 nanosheet-based cathode and an all-phenyl complex + LiCl/tetrahydrofuran hybrid electrolyte. Combined spectroscopic analysis and theoretical simulations revealed that (phenyl)2Mg and tetrahydrofuran inserted into the nanosheets at an early battery-cycling stage. The interlayer spacing of VS2 was expanded from 5.78 to 8.76 Å by the inserted organic species, which significantly reduced the diffusion barrier of Li+. As a result, the LMIBs showed remarkable battery performance with a large discharge capacity (181 mA h g−1 at 50 mA g−1), high rate capability (93 mA h g−1 at 5 A g−1), and long cycle stability (0.04% capacity fading per cycle in 500 cycles).

Graphical abstract: Fast Li+ diffusion in interlayer-expanded vanadium disulfide nanosheets for Li+/Mg2+ hybrid-ion batteries

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Publication details

The article was received on 13 Jan 2018, accepted on 07 Mar 2018 and first published on 08 Mar 2018


Article type: Paper
DOI: 10.1039/C8TA00418H
Citation: J. Mater. Chem. A, 2018,6, 5782-5788
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    Fast Li+ diffusion in interlayer-expanded vanadium disulfide nanosheets for Li+/Mg2+ hybrid-ion batteries

    Y. Meng, Y. Zhao, D. Wang, D. Yang, Y. Gao, R. Lian, G. Chen and Y. Wei, J. Mater. Chem. A, 2018, 6, 5782
    DOI: 10.1039/C8TA00418H

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