(577f) Detecting the Onset of Li Plating during Fast Charging of Li-Ion Batteries Using Operando Electrochemical Impedance Spectroscopy
AIChE Annual Meeting
2021
2021 Annual Meeting
Engineering Sciences and Fundamentals
Lithium and Beyond: Fundamental Advances in High Performance Batteries I
Thursday, November 11, 2021 - 9:20am to 9:35am
In this work, we use impedance spectroscopyâand specifically the Distribution of Relaxation Times (DRT) analysis method10âto detect in operando the onset of Li plating during extreme fast charging. There is a change in the graphite interfacial impedance upon Li plating on the graphite surface. Coupled with both differential voltage relaxation and mass spectrometry titrations for cross-validation, we can reliably detect the Li plating onset graphite state of charge (SOC) for rates as high as 6C at room temperature and for different graphite loadings with <0.5% graphite capacity sensitivity. This study was primarily carried out using three-electrode cell measurements, but we will also show a proof-of-concept for the application of this technique to more commercially relevant two-electrode cells. We will also discuss possible physical explanations for the observed impedance behavior. This capability to detect the onset of Li plating allows for the safe implementation of fast charging protocols, and represents, to the best of our knowledge, the first operando electrochemical technique for Li plating detection.
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