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Screening of Coatings for an All-Solid-State Battery Using In Situ Transmission Electron Microscopy
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Effect of pulse-current-based protocols on the lithium dendrite formation and evolution in all-solid-state batteries.
V Reisecker1,2, F Flatscher2,3, L Porz3
1Institute of Chemistry and Technology of Materials, Graz University of Technology, Graz, Austria.
Nature Communications
|April 27, 2023
Summary
Pulsed currents prevent lithium dendrite formation in solid-state batteries. This method enables higher current densities, improving cycling performance and battery reliability by managing lithium plating dynamics.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Lithium dendrites impede practical all-solid-state battery development.
- Mechanical stress and dendrite growth cause premature cell failure, often below 5 mA/cm².
Purpose of the Study:
- Investigate lithium dendrite formation mechanisms in solid-state batteries.
- Develop a method to enhance cycling performance at higher current densities.
Main Methods:
- Applied a MHz-pulse-current protocol to all-solid-state lithium metal cells.
- Performed mechanistic analysis of experimental results.
- Studied lithium activity at solid-state electrolyte defect tips.
Main Results:
- Achieved reliable cell cycling up to 6.5 mA/cm² using pulsed currents.
- Demonstrated that lithium activity at electrolyte defects is critical for cycling.
- Identified elastic energy release from electrolyte defects as a cause of fracturing.
Conclusions:
- MHz-pulse-current protocol effectively mitigates lithium dendrite formation.
- Controlling lithium plating rates and activity at defect sites is key to stable battery operation.
- Shorter current pulses improve cycling performance by preventing critical lithium activity build-up.
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