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Regulated Breathing Effect of Silicon Negative Electrode for Dramatically Enhanced Performance of Li-Ion Battery

Cited 149 time in Web of Science Cited 151 time in Scopus
Authors

Xiao, Xingcheng; Zhou, Weidong; Kim, Youngnam; Ryu, Ill; Gu, Meng; Wang, Chongmin; Liu, Gao; Liu, Zhongyi; Gao, Huajian

Issue Date
2015-03
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED FUNCTIONAL MATERIALS, Vol.25 No.9, pp.1426-1433
Abstract
Si is an attractive negative electrode material for lithium ion batteries due to its high specific capacity (approximate to 3600 mAh g(-1)). However, the huge volume swelling and shrinking during cycling, which mimics a breathing effect at the material/electrode/cell level, leads to several coupled issues including fracture of Si particles, unstable solid electrolyte interphase, and low Coulombic efficiency. In this work, the regulation of the breathing effect is reported by using Si-C yolk-shell nanocomposite which has been well-developed by other researchers. The focus is on understanding how the nanoscaled materials design impacts the mechanical and electrochemical response at electrode level. For the first time, it is possible to observe one order of magnitude of reduction on breathing effect at the electrode level during cycling: the electrode thickness variation reduced down to 10%, comparing with 100% in the electrode with Si nanoparticles as active materials. The Si-C yolk-shell nanocomposite electrode exhibits excellent capacity retention and high cycle efficiency. In situ transmission electron microscopy and finite element simulations consistently reveals that the dramatically enhanced performance is associated with the regulated breathing of the Si in the new composite, therefore the suppression of the overall electrode expansion.
ISSN
1616-301X
URI
https://hdl.handle.net/10371/201267
DOI
https://doi.org/10.1002/adfm.201403629
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Ryu, Ill류일
조교수
  • College of Engineering
  • Department of Materials Science & Engineering
Research Area Fundamental deformation mechanisms, Optimal desing in nanostructures, Reliability Analysis in Nanostructures

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