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

Jaegeon Ryu, Tianwu Chen, Taesoo Bok, Gyujin Song, Jiyoung Ma, Chihyun Hwang, Langli Luo, Hyun-Kon Song, Jaephil Cho, Chongmin Wang (), Sulin Zhang () and Soojin Park ()
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Jaegeon Ryu: Ulsan National Institute of Science and Technology (UNIST)
Tianwu Chen: Pennsylvania State University
Taesoo Bok: Ulsan National Institute of Science and Technology (UNIST)
Gyujin Song: Ulsan National Institute of Science and Technology (UNIST)
Jiyoung Ma: Ulsan National Institute of Science and Technology (UNIST)
Chihyun Hwang: Ulsan National Institute of Science and Technology (UNIST)
Langli Luo: Pacific Northwest National Laboratory
Hyun-Kon Song: Ulsan National Institute of Science and Technology (UNIST)
Jaephil Cho: Ulsan National Institute of Science and Technology (UNIST)
Chongmin Wang: Pacific Northwest National Laboratory
Sulin Zhang: Pennsylvania State University
Soojin Park: Ulsan National Institute of Science and Technology (UNIST)

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: 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.

Date: 2018
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DOI: 10.1038/s41467-018-05398-9

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