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Issue 18, 2014
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Novel design of ultra-fast Si anodes for Li-ion batteries: crystalline Si@amorphous Si encapsulating hard carbon

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Abstract

Nanocrystalline Si (c-Si) dispersed in amorphous Si (a-Si) encapsulating hard carbon (HC) has been synthesized as an anode material for fast chargeable lithium-ion batteries. The HC derived from natural polysaccharide was coated by a thin a-Si layer through chemical vapour deposition (CVD) using silane (SiH4) as a precursor gas. The HC@c-Si@a-Si anodes showed an excellent cycle retention of 97.8% even after 200 cycles at a 1 C discharge/charge rate. Furthermore, a high capacity retention of ∼54% of its initial reversible capacity at 0.2 C rate was obtained at a high discharge/charge rate of 5 C. Moreover, the LiCoO2/HC@c-Si@a-Si full-cell showed excellent rate capability and very stable long-term cycle. Even at a rate of 10 C discharge/charge, the capacity retention of the LiCoO2/HC@c-Si@a-Si full-cell was 50.8% of its capacity at a rate of 1 C discharge/charge and showed a superior cycle retention of 80% after 160 cycles at a rate of 1 C discharge/charge.

Graphical abstract: Novel design of ultra-fast Si anodes for Li-ion batteries: crystalline Si@amorphous Si encapsulating hard carbon

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Publication details

The article was received on 05 May 2014, accepted on 05 Jul 2014 and first published on 07 Jul 2014


Article type: Paper
DOI: 10.1039/C4NR02394C
Author version available: Download Author version (PDF)
Citation: Nanoscale, 2014,6, 10604-10610
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    Novel design of ultra-fast Si anodes for Li-ion batteries: crystalline Si@amorphous Si encapsulating hard carbon

    C. Kim, M. Ko, S. Yoo, S. Chae, S. Choi, E. Lee, S. Ko, S. Lee, J. Cho and S. Park, Nanoscale, 2014, 6, 10604
    DOI: 10.1039/C4NR02394C

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