Mechanical mismatch-driven rippling in carbon-coated silicon sheets for stress-resilient battery anodes.

Citation data:

Nature communications, ISSN: 2041-1723, Vol: 9, Issue: 1, Page: 2924

Publication Year:
2018
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Readers 6
Repository URL:
http://scholarworks.unist.ac.kr/handle/201301/24520
PMID:
30050036
DOI:
10.1038/s41467-018-05398-9
Author(s):
Ryu, Jaegeon; Chen, Tianwu; Bok, Taesoo; Song, Gyujin; Ma, Jiyoung; Hwang, Chihyun; Luo, Langli; Song, Hyun-Kon; Cho, Jaephil; Wang, Chongmin; Zhang, Sulin; Park, Soojin Show More Hide
Publisher(s):
Springer Nature America, Inc; NATURE PUBLISHING GROUP
Tags:
Chemistry; Biochemistry, Genetics and Molecular Biology; Physics and Astronomy
article description
High-theoretical capacity and low working potential make silicon ideal anode for lithium ion batteries. However, the large volume change of silicon upon lithiation/delithiation poses a critical challenge for stable battery operations. Here, we introduce an unprecedented design, which takes advantage of large deformation and ensures the structural stability of the material by developing a two-dimensional silicon nanosheet coated with a thin carbon layer. During electrochemical cycling, this carbon coated silicon nanosheet exhibits unique deformation patterns, featuring accommodation of deformation in the thickness direction upon lithiation, while forming ripples upon delithiation, as demonstrated by in situ transmission electron microscopy observation and chemomechanical simulation. The ripple formation presents a unique mechanism for releasing the cycling induced stress, rendering the electrode much more stable and durable than the uncoated counterparts. This work demonstrates a general principle as how to take the advantage of the large deformation materials for designing high capacity electrode.