Surface Zeta Potential as a Tool for Quality and Coating Control of Battery Separators
Surface zeta potential enables rapid and reliable fingerprinting to differentiate separator materials and verify ceramic coatings. It enables detection of surface variations independent of porosity, supporting coating control, batch comparison, and routine quality control in separator manufacturing.
Lithium-ion batteries rely on a separator membrane to electrically isolate the anode and cathode while enabling lithium-ion transport. As a critical component, separators strongly influence battery safety, lifetime, and overall performance.
Most commercial separators are based on polyolefin materials such as polypropylene (PP), which offer excellent chemical stability and electrical insulation. To enhance thermal and mechanical stability, ceramic coatings are frequently applied. In industrial production, ensuring the presence, uniformity, and consistency of such coatings is essential for reliable separator quality and performance.
Surface zeta potential is a sensitive parameter that reflects the surface charge of a material in contact with a liquid. Although measured in aqueous environments, it provides a robust and reproducible fingerprint of surface chemistry. Differences in material composition, surface treatment, or coating can be clearly distinguished, making surface zeta potential a powerful tool for rapid quality control, coating verification, and batch-to-batch consistency assessment of battery separators .
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