Mechanical properties and lithiation-induced stress are crucial to the performance and durability of lithium-ion batteries. Here, we report the evolution of elastic modulus and stress in a silicon/polyvinylidene fluoride (PVDF) composite electrode coated on a copper foil, along with a model for analyzing the large change in the radius of curvature of the composite electrode/copper foil cantilever. The radius of curvature of the cantilever is captured by a video camera during lithiation/delithiation. The elastic modulus of the composite electrode decreases from about 0.64 GPa to 0.18 GPa during lithiation. It decreases further to about 0.10 GPa after delithiation, which is caused by the fracture of the electrode. The magnitude of the compressive stress increases lineally during lithiation and decreases suddenly to reach a steady state value during delithiation.
|Number of pages||6|
|Journal||Journal of Power Sources|
|State||Published - 2017|
Bibliographical noteFunding Information:
The authors gratefully acknowledge the financial supports of the National Science Foundation of China under Grant No. 11332005 and 11172159 , and the Shanghai Municipal Education Commission, China , under Grant No. 13ZZ070 . Dawei Li would like to acknowledge the support of China Scholarship Council . Yikai Wang, Jiazhi Hu, and Y.-T. Cheng would like to acknowledge the support from US National Science Foundation Award 1355438 (Powering the Kentucky Bioeconomy for a Sustainable Future).
© 2017 Elsevier B.V.
- Diffusion induced stress
- In situ measurement
- Lithium-ion battery
- Silicon composite electrode
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Energy Engineering and Power Technology
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering