Abstract
In this work, a detailed study of the drying of battery electrodes of different thicknesses is presented. A mathematical model to calculate the solvent loading and film temperature over the drying time is experimentally validated. The model is based on a first study presenting a simulation model to predict the drying course when linear drying kinetics prevail and no resistance exists for solvent transport within the film. To shed some light on the drying behavior of electrode films with different thicknesses, the start of capillary pore emptying is observed using a digital microscope. In the experiments, an onset of capillary transport even before the end of film shrinkage is observed for the electrode films with thicknesses above state‐of‐the‐art‐thickness. A clusterwise drying behavior becomes more distinct for thicker electrodes, with large areas of dry and wet capillaries next to each other, compared to a more homogenous drying of the thin electrodes. Based on these findings, the linear model is extended to consider transport limitations within the porous electrode film in the form of a moving drying front. The experiments show an increasing deviation from the linear model with increasing electrode thickness and the extended simulation, which considers transport resistances within the film, shows good agreement.
Highlights
In this work, a detailed study of the drying of battery electrodes of different thicknesses is presented
High solvent loading can be described like the drying of a pure solvent film
Introduction stops shrinking at the end of film shrinkage (EOF)
Summary
To obtain gravimetric drying curves, the experimental setup using the stationary comb nozzle dryer which was introduced in detail in a previous work was used and is explained here in short.[16] In a second experiment, which was conducted using the comb nozzle dryer, the pore breakthrough to the film bottom was observed. All slurries used in the experiments were mixed using the same procedure and composition. All experiments were repeated at least three times. Four different dry electrode thicknesses were investigated
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