The Battery Experts video series with Anthony Chalou from Anton Paar delves into the significance of the rheological properties of battery slurries. These properties critically influence the coating process, the structure of the coated layer, and the battery's overall electrochemical performance.
In this video, Anthony explains how battery slurries exhibit shear thinning behavior during mixing, where viscosity decreases with increasing shear rates.
Both viscometers and rheometers can be used to determine the flow index, which indicates shear thinning behavior. Viscometers are standardized to ensure consistent results, and they are available in absolute and relative systems.
For precise measurements, it is recommended to maintain a stable temperature, typically at 25 degrees Celsius. Anthony outlines how to set up the viscometer, including selecting the method, setting shear rates, and analyzing the data to generate a detailed report.
Rheometers provide further insights into slurry behavior during mixing, pumping, and coating. Viscosity measurements with rheometers are straightforward and quick. After installing the appropriate measuring system and preparing the slurry sample, the analysis is conducted by setting desired shear rate values and starting the measurement.
Sedimentation stability is another crucial property, assessed using the frequency sweep method in oscillatory measurements. A stable slurry has a higher storage modulus (G') than a loss modulus (G"). The frequency sweep method helps determine the slurry's stability over time by setting the angular frequency range and shear strain value.
Understanding and accurately measuring the rheological properties of battery slurries are essential in optimizing battery manufacturing processes, ensuring high performance and reliability of the final product.
Delve Deeper: Viscosity and Rheological Properties of Battery Slurries | Anton Paar
Video Credit: Anton Paar GmbH
This information has been sourced, reviewed and adapted from materials provided by Anton Paar GmbH.
For more information on this source, please visit Anton Paar GmbH.