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Entropymetry for detecting microcracks in high-nickel layered oxide cathodes.
Minsoo Kim1, Hyunjae Kim1, Inwoo Kim1
1School of Chemical and Biological Engineering and Institute of Chemical Processes, Seoul National University, Seoul 08826, Republic of Korea.
Summary
Entropymetry monitors microcrack evolution in high-nickel layered oxide cathodes for electric vehicle lithium-ion batteries. This nondestructive method enhances battery safety and reliability by tracking degradation during operation.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Electric vehicles (EVs) demand high-performance, long-lasting lithium-ion batteries (LIBs).
- Degradation of high-nickel layered oxide cathodes, common in EVs, is often caused by microcrack formation during battery cycling.
- Real-time, nondestructive monitoring of battery cell degradation is crucial for safety and reliability.
Purpose of the Study:
- To introduce entropymetry as a real-time analytic tool for monitoring microcrack evolution in LIB cathodes.
- To correlate entropy changes with structural heterogeneity and microcrack formation.
- To assess the potential of entropymetry for ensuring safe and reliable EV battery operation.
Main Methods:
- Utilized entropymetry to monitor microcrack evolution in layered oxide cathodes.
- Associated entropy change with lattice configuration and structural heterogeneity.
- Employed in-situ X-ray diffractometry to correlate structural heterogeneity with peak broadening.
- Investigated the impact of experimental conditions (e.g., upper cutoff voltage, Ni-content) on crack formation.
Main Results:
- Entropymetry effectively monitors microcrack evolution in LIB cathodes during cycling.
- Entropy change reflects structural heterogeneity linked to microcrack development.
- Structural heterogeneity was correlated with peak broadening observed via X-ray diffractometry.
- Experimental conditions significantly influence microcrack formation.
Conclusions:
- Entropymetry serves as a valuable nondestructive diagnostic tool for LIBs.
- This method can significantly enhance the safety and reliability of LIBs in EVs.
- Monitoring microcrack evolution is key to understanding and mitigating battery degradation.
