I am making slurries which consist of manganese oxide and graphene.
1. Mix the material with PVDF, the ratio is 9:1 (A total of 40mg)
2. Drop the NMP by disposable pipettes.
The amount of NMP was 12~14 drops.
3. Cast the slurry on copper foil.
4. Dry in the vacuum oven at 100℃ for 12h.
However, when I put the slurry on the copper foil, slurry was split.
I thought the reason.
1. Viscosity of slurry
2. Humidity
Are there any other reasons affecting the condition of slurry?
If someone experienced, please advice me.
Thanks.
In my experience, it is best to first dissolve the PVDF in your NMP prior to adding the solids (MnO2/graphene in this case). When you do add your solids, the resulting slurry should be the viscosity of thick honey and this should give you a nice cast. All materials cast differently, so you need to optimize but this is a good place to start.
I mixed the solids and PVDF in NMP at the same time in a mortar.
I will try that method. Thanks !
Yes, I grind the solids together very well before adding them to the PVDF/NMP solution.
The amount of NMP you have added is too high. That also will cause the slurry split. Try with 4-5 drops of NMP
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