Modeling diffusion-induced stress on two-phase lithiation in lithium-ion batteries
Abstract
Capacity fade induced by chemo-mechanical degradation during charge-discharge cycles is the bottleneck in the design of high-performance batteries, especially high-capacity electrode materials. In this paper, a flexible sigmoid function is used to create the two-phase electrochemical lithiation profile, describing a sharp phase boundary that separates the pristine core from the lithiated shell of an electrode particle. According to such a phase transition, an analytical solution of the stress evolution is obtained by introducing an electrochemical reaction layer into the plastic model. Finally, based on the theory of diffusion-induced stress and the energy principle, we determine the critical thickness of radius of a lithiated layer, at which fracture occurs.
- Publication:
-
European Journal of Mechanics, A/Solids
- Pub Date:
- September 2018
- DOI:
- 10.1016/j.euromechsol.2018.04.005
- Bibcode:
- 2018EuJMA..71..320W
- Keywords:
-
- Lithium-ion battery;
- Two-phase lithiation;
- Fracture;
- Critical size