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Park, Soojin
Nano-Functional Materials Lab
Research Interests
  • Block Copolymers, nanostructured materials for Lithium-Ion batteries, wearable and stretchable energy storage applications

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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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Title
Novel design of ultra-fast Si anodes for Li-ion batteries: Crystalline Si@amorphous Si encapsulating hard carbon
Author
Kim, ChanhoonKo, MinseongYoo, SeungminChae, SujongChoi, SinhoLee, Eun-HoKo, SeungheeLee, Sang-YoungCho, JaephilPark, Soojin
Issue Date
2014-09
Publisher
ROYAL SOC CHEMISTRY
Citation
NANOSCALE, v.6, no.18, pp.10604 - 10610
Abstract
anocrystalline 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 LiCoO 2/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.
URI
https://scholarworks.unist.ac.kr/handle/201301/6221
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84906544557
DOI
10.1039/c4nr02394c
ISSN
2040-3364
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