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Issue 17, 2012
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Designing Si-based nanowall arrays by dynamic shadowing growth to tailor the performance of Li-ion battery anodes

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Abstract

To target the low conductance and stress issues of Si anodes for rechargeable Li-ion batteries, we have systematically designed four unique Si nanorod-based anodes using a dynamic shadowing growth method. Multilayer Cu/Si and Cu side-coated Si nanorods serve to improve the conductance, meanwhile, uniform CuSi and composition-graded CuSi nanocomposites serve to relax the stress and increase the conductance. Under the identical charge/discharge conditions, both the uniform and graded CuSi composite nanostructures exhibit the best cycling performance with capacity retention of 60–80% after 100 cycles of Li-ion insertion and extraction. The morphology evolution reveals that the nanorod wall-like structures remain intact in the uniform and graded CuSi composite anodes, while they have peeled off from the current collectors in the intrinsic Si, multilayer Cu/Si, and Cu side-coated Si samples. The morphological changes of different Si-based nanoanodes have also been modeled by a beam network, revealing that Si-based composite nanostructures generate a low yield stress which could be the key to developing high performance Li-ion battery anodes.

Graphical abstract: Designing Si-based nanowall arrays by dynamic shadowing growth to tailor the performance of Li-ion battery anodes

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Publication details

The article was received on 01 Jan 2012, accepted on 16 Feb 2012 and first published on 16 Mar 2012


Article type: Paper
DOI: 10.1039/C2JM00003B
Citation: J. Mater. Chem., 2012,22, 8294-8303
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    Designing Si-based nanowall arrays by dynamic shadowing growth to tailor the performance of Li-ion battery anodes

    Y. He, B. Yang, K. Yang, C. Brown, R. Ramasamy, H. Wang, C. Lundgren and Y. Zhao, J. Mater. Chem., 2012, 22, 8294
    DOI: 10.1039/C2JM00003B

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