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Issue 12, 2011
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Scalable approach to multi-dimensional bulk Si anodes via metal-assisted chemical etching

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Abstract

Specific design and optimization of the configuration of micro-scale materials can effectively enhance battery performance, including volumetric density. Herein, we employed commercially available low-cost bulk silicon powder to produce multi-dimensional silicon composed of porous nanowires and micro-sized cores, which can be used as anode materials in lithium-ion batteries, by combining a metal deposition and metal-assisted chemical etching process. Nanoporous silicon nanowires of 5–8 μm in length and with a pore size of ∼10 nm are formed in the bulk silicon particle. The silicon electrodes having multi-dimensional structures accommodate large volume changes of silicon during lithium insertion and extraction. These materials show a high reversible charge capacity of ∼2400 mAh g−1 with an initial coulombic efficiency of 91% and stable cycle performance. The synthetic route described herein is simple, low-cost, and mass producible (high yield of 40–50% in tens of gram scale), and thus, provides an effective method for producing high-performance anode materials.

Graphical abstract: Scalable approach to multi-dimensional bulk Si anodes via metal-assisted chemical etching

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Publication details

The article was received on 08 Aug 2011, accepted on 16 Sep 2011 and first published on 28 Oct 2011


Article type: Paper
DOI: 10.1039/C1EE02310A
Citation: Energy Environ. Sci., 2011,4, 5013-5019
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    Scalable approach to multi-dimensional bulk Si anodes via metal-assisted chemical etching

    B. M. Bang, H. Kim, H. Song, J. Cho and S. Park, Energy Environ. Sci., 2011, 4, 5013
    DOI: 10.1039/C1EE02310A

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