Abstract
The effect of reversible electrochemical reaction on Li diffusion and stress in a cylindrical Li-ion battery electrode is studied. A new relation among Li concentration, the fraction of forward reaction product, and the diffusion-reaction-induced stress is derived. The electrochemical reaction has little effect on Li diffusion but enhances the stress significantly, and the reaction induced stress is much larger than diffusion induced stress. The electrochemical reaction will accelerate structural fading or capacity loss of the electrode. The backward reaction can be ignored for both galvanostatic and potentiostatic charging but has a significant effect on stress for galvanostatic discharging. The optimized charging procedure considering the reversible electrochemical reaction is galvanostatic first followed by potentiostatic, which is consistent with the manufacturer recommendation procedure.
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