Volume 37, Issue 1 (9-2018)
2018, 37(1): 29-50 |
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1- Department of Civil Engineering, University of Isfahan, Isfahan, Iran.
2- Department of Civil Engineering, University of Isfahan, Isfahan, Iran. ,mossaiby@eng.ui.ac.ir
2- Department of Civil Engineering, University of Isfahan, Isfahan, Iran. ,
Abstract: (3794 Views)
Experiments have frequently shown that phase separation in lithium-battery electrodes could lead to mechanical failure, poor cycling performance, and reduced capacity. Here, a phase-field model is utilized to investigate how phase separation affects the evolution of the concentration and stress profiles within the spherical/cylindrical electrode particles, during both insertion and extraction half-cycles. To this end, the governing equations are derived and then discretized using the central finite difference method. The resulting algebraic equations are solved numerically with the aid of the Newton-Raphson method to determine both the concentration and stress fields in the electrode particles. For further verification, the results are compared against predictions of an analytical core-shell model. The results suggest that, within the range of parameters considered here, phase separation could lead to a more than five-fold increase in the maximum tensile stress at the particles surface.
Type of Study: Research |
Subject:
Special
Received: 2017/08/21 | Accepted: 2017/12/24 | Published: 2018/09/15
Received: 2017/08/21 | Accepted: 2017/12/24 | Published: 2018/09/15