How to measure filling speed: powder wettability measurement
KRÜSS tensiometers use the time-tested Washburn adsorption method – in an improved version – to analyze the wettability of powders. In this method, a high-precision force sensor detects the wetting rate by means of the mass increase over time when the powder package gets in contact with the liquid. The results can easily be correlated with parameters of the calendering process (see figure) or other properties of the slurry. You can perform these analyses with standard test liquids, but of course also with the electrolyte to improve its formulation.
How to optimize the electrolyte formulation: surface tension determination
Wetting and adsorption are an interplay between the packed powder and the liquid. As a rule of thumb, the wetting speed increases as the surface tension (SFT) decreases, which is why additives that reduce the SFT (surfactants) are often included in electrolyte formulations. SFT measurements are therefore particularly important when it comes to fine-tuning the electrolyte with respect to wetting. The good news is that Washburn and SFT measurements can be carried out with one and the same instrument.
In conclusion: Powder wettability & SFT measurement with a KRÜSS tensiometer is the ideal combination for optimizing formulations and manufacturing processes for electrodes and electrolytes – for greater efficiency and high energy density in LiB production.
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