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Author

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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Structuring of Bulk Silicon Particles for Lithium-Ion Battery Applications

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Title
Structuring of Bulk Silicon Particles for Lithium-Ion Battery Applications
Author
Bang, Byoung-ManKim, Hyun-JungPark, Soojin
Keywords
Bulk silicon; Chemical etching; Structuring of silicon; Lithium ion battery
Issue Date
201109
Publisher
The Korean Electrochemical Society
Citation
Journal of Electrochemical Science and Technology, v.2, no.3, pp.157 - 162
Abstract
We report a simple route for synthesizing multi-dimensional structured silicon anode materials from commercially available bulk silicon powders via metal-assisted chemical etching process. In the first step, silver catalyst was deposited onto the surface of bulk silicon via a galvanic displacement reaction. Next, the silver-decorated silicon particles were chemically etched in a mixture of hydrofluoric acid and hydrogen peroxide to make multi-dimensional silicon consisting of one-dimensional silicon nanowires and micro-scale silicon cores. As-synthesized silicon particles were coated with a carbon via thermal decomposition of acetylene gas. The carbon-coated multi-dimensional silicon anodes exhibited excellent electrochemical properties, including a high specific capacity (1800 mAh/g), a stable cycling retention (cycling retention of 89% after 20 cycles), and a high rate capability (71% at 3 C rate, compared to 0.1 C rate). This process is a simple and mass-productive (yield of 40-50%), thus opens up an effective route to make a high-performance silicon anode materials for lithiumion batteries.
URI
http://scholarworks.unist.ac.kr/handle/201301/3819
DOI
http://dx.doi.org/10.5229/JECST.2011.2.3.157
ISSN
2093-8551
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