Catalyst-free synthesis of Si-SiOx core-shell nanowire anodes for high-rate and high-capacity lithium-ion batteries
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- Catalyst-free synthesis of Si-SiOx core-shell nanowire anodes for high-rate and high-capacity lithium-ion batteries
- Lim, Kwan Woo; Lee, Jung-In; Yang, Jieun; Kim, Young-Ki; Jeong, Hu Young; Park, Soojin; Shin, Hyeon Suk
- core/shell nanowire; lithium-ion battery; rate capability; silicon nanowire; silicon oxide; silicon-based anode
- Issue Date
- AMER CHEMICAL SOC
- ACS APPLIED MATERIALS & INTERFACES, v.6, no.9, pp.6340 - 6345
- Si-SiOx core-shell nanowires (NWs) ranging from 10 to 30 nm in diameter are prepared by a simple evaporation of silicon monoxide and control of substrate temperatures without any catalyst. The Si-SiOx NWs grown at 735 and 955 °C are strongly anchored to the Cu current collector by forming copper silicide at the interface between Si and Cu, and subsequently used as anodes in lithium-ion batteries, in which no binder or conducting materials are used. The Si-SiOx NWs anodes show excellent electrochemical performances in terms of capacity retention and rate capability. In particular, the Si-SiOx NW anode grown at 955 °C shows a reversible capacity of ∼1000 mAh g-1 even at a high-rate of 50 C. This catalyst-free synthetic route of Si-SiOx NWs that are strongly anchored to the Cu current collector opens up an effective process for fabricating other high-capacity anodes in lithium-ion batteries (LIBs).
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