In some literature about electrode processing for Lithium batteries, they mentioned about lump free dispersing which was added to slurry during mixing. For example, graphite electrode using CMC binder in water. What is the best lump free dispersing which able to apply in electrode processing for LiBs applications?
Thank you.
Best regards,
Lumps are inhomogeneous large agglomerates. In case of CMC they form when the powder is contacted with water. CMC on the outside of the lumps will start to swell and form a highly viscous layer around the lumps. Then it will be difficult to disperse them. You may avoid this by first forming a paste of CMC in a nonswelling but water miscible solvent. I think glycerol is commonly used.
It means agglomerates free slurry, which can be achieved by using high sheer dispenser mixer.
PVDF dissolved in NMP (~5% or so) is a very good homogeneous polymer mix for electrode slurry.
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