Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 157, Issue 3, Pages A366-A380Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.3269995
Keywords
diffusion; electrochemical electrodes; electromechanical effects; graphite; lithium alloys; secondary cells; silicon alloys; stress effects; tin alloys
Ask authors/readers for more resources
A mathematical model for diffusion-induced stress generation in spherical Li-ion active materials has been incorporated into Dualfoil, a Li-ion cell-sandwich model with porous electrodes. The model is used to examine differences in the electrochemomechanical response of power vs energy cells at high currents. Porous electrode effects, particularly in energy-type cells with thick electrodes, amplify the peak stresses encountered during lithium insertion and extraction and may result in nonuniform decrepitation or disordering through the depth of the electrode. We also elucidate the roles of fragment connectivity, volume expansion factors, nonlinear lattice expansion, and variable solid-state diffusion on diffusion-induced stress, stress-induced diffusion, and the voltage response of dual-intercalation cells with porous electrodes. In conventional electrode materials (with small volume expansion), pressure diffusion plays a limited role in determining the galvanostatic voltage response but becomes important in determining the stress response. Pressure diffusion and nonlinear lattice expansion play an important role in determining both the voltage and stress response in large-volume-expansion materials (e.g., alloys and perhaps graphite at low utilization).
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available