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Author

Song, Hyun-Kon
eclat: ElectroChemistry Lab of Advanced Technology
Research Interests
  • Electrochemical analysis, electroactive materials, electrochemistry-based energy devices

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

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Title
Mechanical mismatch-driven rippling in carbon-coated silicon sheets for stress-resilient battery anodes
Author
Ryu, JaegonChen, TianwuBok, TaesooSong, GyujinMa, JiyoungHwang, ChihyunLuo, LangliSong, Hyun-KonCho, JaephilWang, ChongminZhang, SulinPark, Soojin
Issue Date
201807
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE COMMUNICATIONS, v.9, no., pp.2924 -
Abstract
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.
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DOI
http://dx.doi.org/10.1038/s41467-018-05398-9
ISSN
2041-1723
Appears in Collections:
ECHE_Journal Papers
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