Hello everyone,
I'm looking for a way to delaminate copper current collector of water-based anodes in Li-ion batteries without damaging the graphite film. I tried different materials such as HNO3 or saturated FeCl3 in organic solvents like acetone, ethanol, DMSO. They could be able to dissolve copper (depending on temperature and concentration) but the problem is that the film dissolves before copper dissolution.
I really appreciate any help.
. Weight Ratio (All other weights depends on how much active power your will use):
Active Powder: 92.5%
CMC: 1.5%
SBR liquid: 2.5%
Conductive: 3.5%
Absolute Alcohol: 15ml/kg graphite
DI water: At least 125% of graphite
2. Make liquid thicken agent:
Heat up Deionized water to 60C and then slowly put the CMC into it and keep stirring unless all of them dissolved.
3. Put alcohol into 125% Deionized water and then to conductive powder to stir.
4. Put active powder into 3 and stir (better have vacuum mixing)
5. Put liquid thicken agent into 4 and stir (better have vacuum mixing)
6. Put SBR into 5 and stir (better have vacuum mixing)
7. Take a little sample and test the viscosity, if, in 3000-5000 mPa·s, it is OK to coat, if over, put some Deionized water, if less, the binder in (CMC and SBR)
Extract copper using a selective complexing agent like potassium ferrocyanide in a solution form and can estimate using UV spectroscopy.
Shrikaant Kulkarni Thanks for the answer. Isn't potassium ferrocyanide only soluble in water? If so, it dissolves the graphite layer. Even organic solutions mentioned above first dissolved the graphite layer.
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