How well the particles are wetted
An electrode slurry is a mixture of active material, conductive additive, binder and solvent. The quality of the coating depends on how well the particles are wetted and spread. Solvent that sits at a particle surface relaxes faster than solvent that moves freely, so the relaxation time of the solvent is a measure of how much of the surface is wetted.
Where it is used
- Anode and cathode slurries
- Slurries with different binders, solvents and solid loadings
- Conductive additives and binder solutions
Typical tasks are finding the mixing time that is needed, comparing binders and additives, checking batches, and seeing how a slurry changes while it stands.
Following the solvent during mixing
A small amount of slurry is taken at different times during mixing and measured. As the particles are wetted, the relaxation time of the solvent falls and reaches a plateau. The time to the plateau shows when mixing is complete.
What it adds
- Works on black, opaque slurries as they are
- No dilution, which could change the slurry
- A quick answer from a small sample
- A way to compare recipes on the same scale before coating trials
Points that matter in practice
- Conductive carbons and some active materials contain paramagnetic or magnetic components that shorten relaxation times, so compare slurries with the same materials
- Slurries change while they stand, so measure at defined times after mixing
- Handle solvents according to their safety rules
- The link between the relaxation time and the quality of the coated electrode has to be established for your own process
From your slurry to a routine method
Describe your materials and your process. MSY Consulting runs feasibility measurements, plans the sampling and the comparison with you, and trains your team until the method is part of your routine.
Let's talk about your application
Send an email describing your instrument and your application, and you will get a reply.
contact@msyconsulting.euMSY CONSULTING SAS · Wissembourg, France · LinkedIn