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

Citation data:

Advanced materials (Deerfield Beach, Fla.), ISSN: 1521-4095, Vol: 30, Issue: 15, Page: e1705430

Publication Year:
2018
Captures 22
Readers 22
Citations 2
Citation Indexes 2
Repository URL:
http://scholarworks.unist.ac.kr/handle/201301/24125
PMID:
29512209
DOI:
10.1002/adma.201705430
Author(s):
Son, Yoonkook; Sim, Soojin; Ma, Hyunsoo; Choi, Min; Son, Yeonguk; Park, Noejung; Cho, Jaephil; Park, Minjoon
Publisher(s):
Wiley; WILEY-V C H VERLAG GMBH
Tags:
Materials Science; Engineering; anodes; lithium-ion batteries; nanowires; silicon; strain
article description
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.