Journal
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
Volume 70, Issue -, Pages 349-361Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2014.06.004
Keywords
Lithium-ion battery; Diffusion; Large-strain plasticity; Anisotropic swelling; Fracture
Funding
- NSF grant [CMMI-0900692, CMMI-1100205]
- China National Natural Science Foundation [10925209, 91216201]
- Program for Changjiang Scholars
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1201058, 1100205] Funding Source: National Science Foundation
Ask authors/readers for more resources
We present a chemo-mechanical model to investigate the lithiation-induced phase transformation, morphological evolution, stress generation and fracture in crystalline silicon nanowires (c-SiNWs). The model couples lithium (Li) diffusion with elasto-plastic deformation in a three-dimensional (3D) setting. Several key features observed from recent transmission electron microscopy (TEM) studies are incorporated into the model, including the sharp interface between the lithiated amorphous shell and unlithiated crystalline core, crystallographic orientation dependent Li-Si reaction rate, and large-strain plasticity. Our simulation results demonstrate that the model faithfully predicts the anisotropic swelling of lithiated SiNWs observed from previous experimental studies. Stress analysis from the finite-deformation model reveals that the SiNWs are prone to surface fracture at the angular sites where two adjacent {110} facets intersect, consistent with previous experimental observations. The mechanistic understanding of the morphological evolution and stress generation sheds light on the design of failure-resistant nanostructured electrodes. Our model offers a framework for the study of the chemo-mechanical degradation in high-capacity electrode materials. (C) 2014 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available