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

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 rip

SUBMITTER: Ryu J 

PROVIDER: S-EPMC6062545 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature