Exploring Critical Factors Affecting Strain Distribution in 1D Silicon-Based Nanostructures for Lithium-Ion Battery Anodes

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Title
Exploring Critical Factors Affecting Strain Distribution in 1D Silicon-Based Nanostructures for Lithium-Ion Battery Anodes
Author
Son, YoonkookSim, SoojinMa, HyunsooChoi, MinSon, YeongukPark, NoejungCho, JaephilPark, Minjoon
Issue Date
2018-04
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED MATERIALS, v.30, no.15, pp.1705430
Abstract
Despite the advantage of high capacity, the practical use of the silicon anode is still hindered by large volume expansion during the severe pulverization lithiation process, which results in electrical contact loss and rapid capacity fading. Here, a combined electrochemical and computational study on the factor for accommodating volume expansion of silicon-based anodes is shown. 1D silicon-based nanostructures with different internal spaces to explore the effect of spatial ratio of voids and their distribution degree inside the fibers on structural stability are designed. Notably, lotus-root-type silicon nanowires with locally distributed void spaces can improve capacity retention and structural integrity with minimum silicon pulverization during lithium insertion and extraction. The findings of this study indicate that the distribution of buffer spaces, electrochemical surface area, as well as Li diffusion property significantly influence cycle performance and rate capability of the battery, which can be extended to other silicon-based anodes to overcome large volume expansion.
URI
https://scholarworks.unist.ac.kr/handle/201301/24125
URL
https://onlinelibrary.wiley.com/doi/abs/10.1002/adma.201705430
DOI
10.1002/adma.201705430
ISSN
0935-9648
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ECHE_Journal Papers
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