Campus Units
Mechanical Engineering
Document Type
Article
Publication Version
Published Version
Publication Date
7-25-2017
Journal or Book Title
Journal of the Electrochemical Society
Volume
164
Issue
11
First Page
E3606
Last Page
E3612
DOI
10.1149/2.0631711jes
Abstract
Mechanical stresses which develops during lithiation of crystalline silicon particles in lithium silicon battery causes fracture and limits the life of silicon based lithium batteries. We formulated an elasto-plastic stress formulation for a two-phase silicon model and investigated the influence of different mechanical properties of lithiated silicon on the fracture of nanoparticles during first cycle charging. A chemo-mechanical model was developed to determine lithium distribution and associated stress states during first cycle lithiation. The concentration gradient of lithium and an elastic perfectly plastic material behavior for silicon were considered to evaluate stress distribution formulation and determine stress field in the particle. The stress profile was used to perform a crack growth analysis. The stress distribution formulation was validated by evaluating stress field for different elastic modulus value for lithiated silicon and comparing our inference against observations from prior experiments. The results showed lower modulus of lithiated silicon yielded results like experimental observations for nanoparticles. The size dependent fracture behavior was also observed in lower elastic modulus of lithiated silicon. We conclude that accurate mechanical characterization of lithiated silicon nanoparticle is necessary to model the failure of silicon particle and improving the mechanical properties may suppress crack growth in silicon nanoparticles during charging.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.
Copyright Owner
The Author(s)
Copyright Date
2017
Language
en
File Format
application/pdf
Recommended Citation
Sarkar, Abhishek; Shrotriya, Pranav; and Chandra, Abhijit, "Fracture Modeling of Lithium-Silicon Battery Based on Variable Elastic Moduli" (2017). Mechanical Engineering Publications. 389.
https://lib.dr.iastate.edu/me_pubs/389
Comments
This article is published as Sarkar, Abhishek, Pranav Shrotriya, and Abhijit Chandra. "Fracture modeling of lithium-silicon battery based on variable elastic moduli." Journal of The Electrochemical Society 164, no. 11 (2017): E3606-E3612. DOI: 10.1149/2.0631711jes. Posted with permission.