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Updated: Jun 19, 2026
09:12
A Method for Studying the Temperature Dependence of Dynamic Fracture and Fragmentation
Published on: June 28, 2015
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Morphological Heterogeneity Impact of Film Solid-State Cathode on Utilization and Fracture Dynamics
Se Hwan Park1, Carlos Juarez-Yescas2, Kaustubh G Naik3
1Andlinger Center for Energy and the Environment, Princeton University, Princeton, New Jersey 08540, United States.
ACS Nano
|June 4, 2025
Summary
Structural heterogeneity in solid-state batteries causes material underutilization and fracture. Optimizing electrode design is crucial for alleviating stress and improving performance in lithium cobalt oxide cathodes.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-State Batteries
Background:
- Structural heterogeneity in solid-state batteries impacts material utilization and fracture.
- Void distribution is key to understanding stress relief and buildup during battery cycling.
Purpose of the Study:
- To investigate how void distribution influences stress generation and fracture in LiCoO2 film cathodes.
- To understand structural changes across multiple length scales during battery cycling.
Main Methods:
- Operando and ex situ synchrotron-based experiments (nanotomography, energy-dispersive X-ray diffraction, 3D X-ray absorption near-edge spectroscopy).
- Chemo-mechanical modeling and site-specific mechanical characterization.
Main Results:
- Depth-dependent porosity variation observed, with preferential fracture in low-porosity regions.
- Underutilization of cathode material identified in dense regions.
- Preferential delithiation near subgrain boundaries confirmed.
Conclusions:
- Stress accumulation in dense electrode regions leads to fracture and material underutilization.
- Material design strategies are essential to mitigate stress in low-volume changing cathodes.
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