Showcasing Research Using Squidstats - September 2026
Electrochemical Impedance Spectroscopy (EIS) data collected on a Squidstat Plus at the Washington University in St. Louis
This month we're showcasing research article titled " Calendar Aging of Li-O2 Cells Under Different Storage Environments Probed by Operando Mechanical Pressure" from the Washington University in St. Louis.
Calendar Aging of Li-O2 Cells Under Different Storage Environments Probed by Operando Mechanical Pressure
Y. Nayfeh and X. Li. Journal of Power Sources 2026, 681, 240240 https://doi.org/10.1016/j.jpowsour.2026.240240
This study aimed to understand the factors driving calendar aging in Li-O2 batteries. To test how the environment influences Li metal anode degradation, cells were exposed to either an inert atmosphere (Ar), O2, or ambient air. Using the EIS capabilities of the Squidstat Plus, researchers gauged how interfacial degradation of the Li metal anode impacted the bulk resistance of the cells over time. The cells kept in an inert atmosphere showed almost no increase in relative ohmic resistance, while those exposed to O2 and ambient air showed a significant increase. This resistance was even more intense when the gas was flowing.
The researchers found that the relative increase in ohmic impedance correlated strongly with the mechanical volume expansion of the Li metal anode. From this correlation, they concluded that electrolyte consumption via interfacial parasitic reactions is the main driver of the cell's volumetric expansion. To combat these effects, they demonstrated that increasing the electrolyte concentration and modifying the separator material were effective in reducing the mechanical pressure buildup and the resulting increase in resistance.
These results show how cell design and the air delivery system in a Li-O2 battery can greatly impact its performance.
This is just one example of how Squidstats are being used to further electrochemical research every day in labs all over the world! Do you want to showcase how you use Squidstats in your research? Send us an email at support@admiralinstruments.com!
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