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Issue 17, 2018
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Ultra-long life Si@rGO/g-C3N4 with a multiply synergetic effect as an anode material for lithium-ion batteries

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Abstract

Remarkable volume changes (>300%) and poor electrical conductivity hinder the commercial application of silicon in lithium ion batteries despite the fact that it delivers a high theoretic capacity of 4200 mA h g−1. Thus, a novel Si@rGO/g-C3N4 hybrid with a 3D porous sandwiched architecture, where silicon nanoparticles are anchored uniformly onto a rGO/g-C3N4 hybrid matrix via interface chemical bonding, is synthesized by a facile combined method of template-free self-assembly and heat-treatment. This sandwiched Si@rGO/g-C3N4 hybrid anode material exhibits a high reversible capacity of 1354.8 mA h g−1 at 0.1C and an ultra-long cycle life of 1000 cycles at 0.5C. A capacity loss of only 0.019% per cycle at 0.5C is achieved with a coulombic efficiency of 99.8%, even after 1000 cycles. The outstanding cycling performance could be attributed to the interface bonding between the surface Si NPs (silicon nanoparticles) and N-doped rGO/g-C3N4, which not only creates inert domains for controllable lithium ion intercalation, but also configures a relatively stable mechanical structure on cycling. The reported approach provides a viable strategy to synthesise ultra-long-life silicon anode materials.

Graphical abstract: Ultra-long life Si@rGO/g-C3N4 with a multiply synergetic effect as an anode material for lithium-ion batteries

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Publication details

The article was received on 17 Jan 2018, accepted on 20 Mar 2018 and first published on 21 Mar 2018


Article type: Paper
DOI: 10.1039/C8TA00539G
Citation: J. Mater. Chem. A, 2018,6, 7557-7565
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    Ultra-long life Si@rGO/g-C3N4 with a multiply synergetic effect as an anode material for lithium-ion batteries

    G. Wang, Z. Wen, Yan-E. Yang, J. Yin, W. Kong, S. Li, J. Sun and S. Ji, J. Mater. Chem. A, 2018, 6, 7557
    DOI: 10.1039/C8TA00539G

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