Structuring of Bulk Silicon Particles for Lithium-Ion Battery Applications
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- Structuring of Bulk Silicon Particles for Lithium-Ion Battery Applications
- Bang, Byoung-Man; Kim, Hyun-Jung; Park, Soojin
- Bulk silicon; Chemical etching; Structuring of silicon; Lithium ion battery
- Issue Date
- The Korean Electrochemical Society
- Journal of Electrochemical Science and Technology, v.2, no.3, pp.157 - 162
- 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.
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