Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.003
Publication date: 16th December 2024
Lithium metal all-solid-state batteries promise to deliver a step-change in cell energy density and safety.[1,2] However, at charge/discharge rates on the order of 1 mA cm2, plating of lithium results in growth of lithium filaments through the solid electrolyte (dendrites),[3,4] and stripping of Li leads to contact loss between the lithium anode and solid electrolyte (voids).[5-7] This talk will cover our recent findings on the mechanisms of dendrite growth and voiding, and the testing protocols used to determine the maximum failure-free rates of charge/discharge.
Mechanism: Synchrotron-source X-ray computed tomography enables us to image the evolution of interfaces in a solid-state battery during operation. Visualization of the formation of dendrites and voids, in combination with modelling, provides insights into how these failure mechanisms might be prevented.[3,4,6]
Testing protocols: As solid-state batteries move towards commercialisation, it is increasingly important to determine the maximum rates at which they can be charged/discharged without formation of dendrites/voids. Our recent work investigates some conventionally used testing protocols, and identifies how these can be improved to increase accuracy and reproducibility.
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