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Issue 6, 2018
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Highly porous coral-like silicon particles synthesized by an ultra-simple thermal-reduction method

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Abstract

Porous Si is considered a potential anode material for next-generation Li-ion batteries (LIBs) because of its high specific capacity, low lithiation/delithiation potential, low cost, and environmental friendliness. In this work, we introduce a simplified Mg-thermal-reduction method for the production of mass-scalable coral-like bulk-Si powder with a high surface area (38 m2 g−1), broad pore-size distribution (2–200 nm), and 3-dimensionally (3D) interconnected Si structure for application in LIBs. The porous, coral-like Si electrode delivered a high reversible capacity of 2451 mA h g−1, corresponding to ∼70% of the theoretical capacity of Si, at a rate of C/10. After 100 cycles, the porous, coral-like Si electrode maintained a capacity of 1956 mA h g−1, corresponding to 79.8% of the initial reversible capacity. Importantly, a reasonably high reversible capacity of 614 mA h g−1 was achieved even at a high rate of 10C. These outstanding results demonstrate that the 3D-networked, porous, coral-like Si powder, synthesized via a NaCl-assisted Mg-thermal-reduction process on a stainless-steel plate over a period of one minute, can be employed as a promising anode material for the next generation of high-energy LIBs.

Graphical abstract: Highly porous coral-like silicon particles synthesized by an ultra-simple thermal-reduction method

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Publication details

The article was received on 14 Oct 2017, accepted on 08 Jan 2018 and first published on 09 Jan 2018


Article type: Paper
DOI: 10.1039/C7TA09042K
Citation: J. Mater. Chem. A, 2018,6, 2834-2846
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    Highly porous coral-like silicon particles synthesized by an ultra-simple thermal-reduction method

    D. T. Ngo, H. T. T. Le, X. Pham, J. Jung, N. H. Vu, J. G. Fisher, W. Im, I. Kim and C. Park, J. Mater. Chem. A, 2018, 6, 2834
    DOI: 10.1039/C7TA09042K

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