Meaning
High-resolution, non-contact imaging systems utilizing low-coherence light to capture micrometer-scale cross-sectional views of internal material structures provide a powerful tool for inspecting battery electrodes. Through optical coherence tomography, researchers observe the real-time formation of the solid-electrolyte interphase during initial charging. This technique delivers high-speed imaging without damaging the delicate cell components, making it ideal for in-situ studies of lithium dynamics.
Diagnostic Imaging
Light reflected from the internal interfaces of the electrode layers is analyzed to map the thickness and uniformity of the coatings. Applying optical coherence tomography allows engineers to detect microscopic delamination and cracking in the active material layers. This diagnostic can be integrated directly into roll-to-roll manufacturing lines.
Quality Verification
Fast-charging protocols can cause localized lithium plating, which is visible on the electrode surface. Using optical coherence tomography helps identify the onset of this plating before it can lead to hazardous dendrite formation. This provides an early warning of potential safety issues.
Process Optimization
Coated electrode foils must have a highly uniform thickness to ensure even current distribution. Incorporating optical coherence tomography into the quality control process reduces the variability of electrode production. This optimization leads to higher cell performance and fewer batch rejections.
