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Dual-Size Silicon Nanocrystal-Embedded SiOx Nanocomposite as a High-Capacity Lithium Storage Material

Title
Dual-Size Silicon Nanocrystal-Embedded SiOx Nanocomposite as a High-Capacity Lithium Storage Material
Author
김한수
Keywords
lithium-ion battery; Si/SiOx; Si embedded SiOx nanocomposites; anodes
Issue Date
2015-09
Publisher
AMER CHEMICAL SOC
Citation
ACS NANO, v. 9, NO 7, Page. 7690-7696
Abstract
SiOx-based materials attracted a great deal of attention as high-capacity Li+ storage materials for lithium-ion batteries due to their high reversible capacity and good cycle performance. However, these materials still suffer from low initial Coulombic efficiency as well as high production cost, which are associated with the complicated synthesis process. Here, we propose a dual-size Si nanocrystal-embedded SiOx, nanocomposite as a high-capacity Li+ storage material prepared via cost-effective sol-gel reaction of triethoxysilane with commercially available Si nanoparticles. In the proposed nanocomposite, dual-size Si nanocrystals are incorporated into the amorphous SiOx matrix, providing a high capacity (1914 mAh g(-1)) with a notably improved initial efficiency (73.6%) and stable cycle performance over 100 cycles. The highly robust electrochemical and mechanical properties of the dual-size Si nanocrystal-embedded SiOx nanocomposite presented here are mainly attributed to its peculiar nanoarchitecture. This study represents one of the most promising routes for advancing SiOx-based Li+ storage materials for practical use.
URI
http://pubs.acs.org/doi/abs/10.1021/acsnano.5b03166http://hdl.handle.net/20.500.11754/27358
ISSN
1936-0851; 1936-086X
DOI
10.1021/acsnano.5b03166
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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