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Oxygen Vacancy Evolution at LixV2O5/LiPON Solid State Electrochemical Interfaces Using Depth Resolved
Daniel Halbing1, Gregory Pustorino2, Leopoldo Tapia-Aracayo3
1Department of Physics, The Ohio State University, Columbus, Ohio 43210, United States.
ACS Applied Materials & Interfaces
|April 17, 2026
Summary
Oxygen vacancies form at LiPON/LixV2O5 interfaces, degrading battery performance. Their accumulation increases lithium diffusion barriers, contributing to capacity fade during cycling.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-State Chemistry
Background:
- The LiPON/LixV2O5 interface is crucial for solid-state battery performance.
- Understanding interfacial phenomena is key to improving battery longevity and efficiency.
Purpose of the Study:
- To investigate the formation and evolution of oxygen vacancies at buried LiPON/LixV2O5 interfaces.
- To correlate oxygen vacancy behavior with electrochemical cycling and battery degradation.
Main Methods:
- Depth-resolved cathodoluminescence spectroscopy (DRCLS) for nanoscale defect analysis.
- Density functional theory (DFT) calculations to identify defect origins.
- Electrochemical cycling in a LiPON/LixV2O5 half-cell.
Main Results:
- Oxygen vacancies were observed near the interface even before cycling, suggesting spontaneous O diffusion.
- DRCLS showed increasing oxygen vacancy signals deeper into the electrode with cycling.
- Electrochemical cycling revealed poor Coulombic efficiency and a 15% capacity drop over 50 cycles.
Conclusions:
- Spontaneous oxygen diffusion contributes to interface-localized oxygen vacancies.
- Accumulation of oxygen vacancies hinders lithium diffusion, acting as a battery degradation mechanism.
- These findings offer insights into improving the stability of LixV2O5-based batteries.
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