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Mechanical stresses at the cathode–electrolyte interface in lithium-ion batteries

Published online by Cambridge University Press:  19 October 2016

Sangwook Kim  and
Hsiao-Ying Shadow Huang
Sangwook Kim
Affiliation:
Mechanical and Aerospace Engineering Department, North Carolina State University, Raleigh, NC27695
Hsiao-Ying Shadow Huang*
Affiliation:
Mechanical and Aerospace Engineering Department, North Carolina State University, Raleigh, NC27695
*
a)Address all correspondence to this author. e-mail: hshuang@ncsu.edu
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Abstract

Experimental studies have shown capacity loss and impedance rise on the surfaces of cathode particles during (dis)charging in lithium-ion batteries. However, there are surprisingly few studies focusing on the cathode–electrolyte interface. The current study uses multiphysics finite element models to understand fluid–structure interactions in a half-cell battery system. Effects of C-rate, particle sizes, lithiation, and phase transformation of the cathode at the interface are investigated. Results demonstrate that doubling the particle size results in larger available lithium intercalation areas, giving rise to increased tension 1.40 times and compression 1.82 times at the interface. Moreover, higher C-rate with high lithium-ion concentration gradient results in higher mechanical stresses at the interface. These coupling factors are strongly related to the experimentally observed battery degradation. Our simulations demonstrate that both electrode and electrolyte have pronounced effects when investigating mechanical stresses at the electrode–electrolyte interface.

Keywords

stress analysisparticle sizeelectrolyte–electrode interfacesC-ratelithium-ion battery
Type
Invited Paper
Information
Journal of Materials Research , Volume 31 , Issue 22 , 28 November 2016 , pp. 3506 - 3512
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Copyright
Copyright © Materials Research Society 2016 

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