Helical Silicon/Silicon Oxide Core-Shell Anodes Grown onto the Surface of Bulk Silicon
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- Helical Silicon/Silicon Oxide Core-Shell Anodes Grown onto the Surface of Bulk Silicon
- Yoo, Hana; Lee, Jung-In; Kim, Hyunjung; Lee, Jung-Pil; Cho, Jaephil; Park, Soojin
- Anode material; Bulk silicon; Core-shell; Cycling performance; Electrochemical performance; High specific capacity; High-temperature annealing; Lithiation; Lithium ion batteries; Nanocoils; Nanostructured composites; Urchin-like; Volumetric capacity
- Issue Date
- AMER CHEMICAL SOC
- NANO LETTERS, v.11, no.10, pp.4324 - 4328
- We demonstrate a simple route for preparing Si/SiO(x) urchin-like structures in which Si/SiO(x) core-shell nanocoils protruded out from the surface of bulk Si, via high-temperature annealing of Pt-decorated Si powders. The carbon-coated urchin-like anodes with micro- and nanostructured composite exhibit a significantly improved electrochemical performance with a high specific capacity of 1600 mAh/g and a superior cycling performance of 70 cycles at a rate of 0.2 C due to the nanocoil conformation and SiO(x) buffer layer. More importantly, the composite results in a significantly enhanced the volumetric capacity with similar to 3780 mAh/cc, compared to bulk Si (similar to 2720 mAh/cc) after fully lithiation to 0 V.
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