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나노입자 연구단
나노입자 연구단
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Elucidating relationships between structural properties of nanoporous carbonaceous shells and electrochemical performances of si@carbon anodes for lithium-ion batteries

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Title
Elucidating relationships between structural properties of nanoporous carbonaceous shells and electrochemical performances of si@carbon anodes for lithium-ion batteries
Author(s)
Ahn J.; Kyung Jae Lee; Bak W.; Jung-Joon Kim; Lee J.-K.; Yoo W.C.; Yung-Eun Sung
Publication Date
2015-05
Journal
JOURNAL OF PHYSICAL CHEMISTRY C, v.119, no.19, pp.10255 - 10265
Publisher
AMER CHEMICAL SOC
Abstract
The encapsulation of silicon in hollow carbonaceous shells (Si@C) is known to be a successful solution for silicon anodes in Li-ion batteries, resulting in many efforts to manipulate the structural properties of carbonaceous materials to improve their electrochemical performance. In this regard, we demonstrate in this work how both the shell thickness and pore size of nanoporous carbonaceous materials containing silicon anodes influence the electrochemical performance. Structurally well-defined Si@C materials with varying carbon-shell thicknesses and pore sizes were synthesized by a nanocasting method that manipulated the carbon shell and by a subsequent magnesiothermic reduction that converted the amorphous silica cores into silicon nanocrystals. When these materials were employed as anodes, it was verified that two opposite effects occur with respect to the thickness of carbon shell: The weight ratio of silicon and the electrical conductivity are simultaneously affected, so that the best electrochemical performance is not obtained from either the thickest or the thinnest carbon shell. Such countervailing effects were carefully confirmed through a series of electrochemical performance tests and the use of electrochemical impedance spectroscopy. In addition, the effect of pore size was elucidated by comparing Si@C samples with different pore sizes, revealing that larger pores can further improve the electrochemical performance as a result of enhanced Li-ion diffusion. © 2015 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/2028
ISSN
1932-7447
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
Files in This Item:
26.Jounal of Physical Chemistry C_201505-2.pdfDownload

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