A prototype solid-state lithium battery suffered a catastrophic internal short circuit during laboratory tests. Using a 3D pipeline based on ultra-high-resolution micro-CT, researchers have managed to visualize lithium needles, known as dendrites, that penetrated the rigid ceramic electrolyte. These structures, invisible to the naked eye, grew through pre-existing micro-cracks in the material.
3D Pipeline: VGSTUDIO MAX and COMSOL in Action 🔬
The analysis process begins with the acquisition of ultra-high-resolution tomographies. The volumetric data is processed in Volume Graphics VGSTUDIO MAX, where lithium dendrites are segmented and quantified thanks to their density contrast. This software allows inspection of the micro-crack network and the morphology of the needles. Subsequently, the extracted 3D models are imported into COMSOL Multiphysics for electrochemical simulations. In COMSOL, charge and discharge conditions are recreated, correlating the real geometry of the dendrites with the local stress peaks that cause electrolyte failure.
Implications for Safer Batteries ⚡
The combination of micro-CT and simulation reveals that dendrites do not grow randomly, but rather exploit microscopic defects in the ceramic. This finding is critical for designing denser and more resistant electrolytes. The presented 3D pipeline not only allows diagnosing failures but also offers a roadmap to predict and prevent short circuits in future generations of solid-state batteries, accelerating the development of safer energy storage systems.
What implications does the fact that micro-computed tomography has revealed that lithium dendrites can grow through grain boundaries even in materials considered high-density have for the design of future ceramic electrolytes?
(PS: Visualizing materials at the molecular level is like looking at a sandstorm with a magnifying glass.)