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Cho, Jaephil
Nano Energy Storage Materials Lab (NESM)
Research Interests
  • Li-ion battery, metal-air battery, redox-flow battery, flexible battery .

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Synthesis and electrochemical properties of lithium-electroactive surface-stabilized silicon quantum dots

Cited 19 times inthomson ciCited 21 times inthomson ci
Title
Synthesis and electrochemical properties of lithium-electroactive surface-stabilized silicon quantum dots
Author
Kwon, YoojungPark, Gyeong-SuCho, Jaephil
Keywords
Anode; Capacity; Cycle life; Li battery; Nanoparticle; Si
Issue Date
200704
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
ELECTROCHIMICA ACTA, v.52, no.14, pp.4663 - 4668
Abstract
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.
URI
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DOI
http://dx.doi.org/10.1016/j.electacta.2007.01.077
ISSN
0013-4686
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