Journal
ELECTROCHEMISTRY
Volume 89, Issue 4, Pages 355-362Publisher
ELECTROCHEMICAL SOC JAPAN
DOI: 10.5796/electrochemistry.21-00033
Keywords
Stress; Li Chemical Potential; Phase Equilibria; Two-phase Battery Electrode Materials
Categories
Funding
- JSPS KAKENHI [19H05814, 20H05282]
- Grants-in-Aid for Scientific Research [19H05814, 20H05282] Funding Source: KAKEN
Ask authors/readers for more resources
The experimental results show that the mu(Li) in two-phase electrode materials immediately changes after loading and then gradually changes while maintaining a constant mechanical load. Loading and unloading lead to mu(Li) variations in the opposite direction. This characteristic mu(Li) variations can be explained by considering the change in the phase equilibrium between the two phases.
We experimentally evaluated the influence of stress on the Li chemical potential (mu(Li)) and phase equilibrium in the two-phase battery electrode materials through the emf measurements while applying a mechanical load. In our measurements, we prepared an electrochemical cell by depositing a thin film of a two-phase electrode material (LiFePO4 or LiCoO2 in the two-phase region) on each of the solid electrolyte surfaces. Then we applied a mechanical load to the electrochemical cell through four-point bending, and the resulting mu(Li) variation in the electrode material was measured as the emf between the two thin films. Our results indicated that mu(Li) in the two-phase electrode materials immediately changed just after loading and then gradually changed while maintaining a constant mechanical load. Besides, the loading and unloading led to the mu(Li) variation in the opposite direction. Such characteristic mu(Li) variations could be explained by considering the change in the phase equilibrium between the two phases, which led to the Li content variation in the two phases and the stress relaxation due to the volume fraction variation of the two phases. Our results can provide valuable insights regarding the influence of stress on the performances of energy storage devices with two-phase electrode materials. (C) The Author(s) 2021. Published by ECSJ.
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