Synthesis and electrochemical properties of lithium-electroactive surface-stabilized silicon quantum dots
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- Synthesis and electrochemical properties of lithium-electroactive surface-stabilized silicon quantum dots
- Kwon, Yoojung; Park, Gyeong-Su; Cho, Jaephil
- Anode; Capacity; Cycle life; Li battery; Nanoparticle; Si
- Issue Date
- PERGAMON-ELSEVIER SCIENCE LTD
- ELECTROCHIMICA ACTA, v.52, no.14, pp.4663 - 4668
- Highly lithium-electroactive Si quantum dots (n-Si), coated with an amorphous carbon layer, were prepared by of butyl-capped Si annealing at 700 or 900 °C. The ordering of the carbon layer structure increased with increasing annealing temperature while the thickness decreased to 1 from 2 nm due to the increased ordering of carbon. n-Si, annealed at 900 °C, had the same particle size (5 nm) as n-Si annealed at 700 °C. In contrast to Si nanocrystals with an average particle size of 30 nm that had a first charge capacity of 225 mAh/g with a very small coulombic efficiency of 4%, n-Si that annealed at 900 °C possessed a first charge capacity of 1257 mAh/g with a significantly enhanced coulombic efficiency of 71%. This improvement was due to the uniform distribution of n-Si with a carbon layer that prohibited n-Si aggregation during cycling.
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