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.

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.

Creative Commons License

Creative Commons Attribution 4.0 License
This work is licensed under a Creative Commons Attribution 4.0 License.

Copyright Owner

The Author(s)

Language

en

File Format

application/pdf

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