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Operando Quantified Lithium Plating Determination Enabled by Dynamic Capacitance Measurement in Working Li-Ion
Lei Xu1,2, Ye Xiao1,2, Yi Yang1,2
1School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China.
Angewandte Chemie (International Ed. in English)
|August 8, 2022
Summary
A new method quantifies lithium plating in lithium-ion batteries (LIBs) during operation. This dynamic capacitance measurement (DCM) technique enables real-time monitoring for safer battery performance.
Area of Science:
- Electrochemistry
- Materials Science
- Battery Technology
Background:
- Lithium plating in lithium-ion batteries (LIBs) impedes full performance and poses safety risks.
- A rapid, quantitative method for determining lithium plating under working conditions is crucial for safe LIB operation.
Purpose of the Study:
- To unveil the relationship between electrical double layer (EDL) capacitance and electrochemical active surface area (ECSA) of graphite anodes during Li-ion intercalation and plating.
- To propose and validate an operando method for real-time lithium plating determination in practical LIBs.
Main Methods:
- Developed a dynamic capacitance measurement (DCM) test.
- Utilized alternating current (AC) frequency selection to isolate anodic responses from cathodic interference.
- Applied DCM to graphite anodes during Li-ion battery cycling.
Main Results:
- Established a correlation between EDL capacitance and ECSA during Li-ion intercalation and plating.
- Demonstrated that DCM can quantitatively trace the onset of lithium plating.
- Showcased the applicability of DCM in practical LIBs under working conditions.
Conclusions:
- The DCM test provides a reliable method for real-time, operando determination of lithium plating.
- This technique facilitates the development of safer and more robust lithium-ion batteries.
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