After the electrodes are rolled and slit into smaller electrode bands, these coils need to be dried. For a high-quality battery, it is essential to remove most of the humidity and solvent residues. Vacuum drying is the production proven state of the art solution with drying times in between 12 and 30 hours per batch.
Leybold robust and reliable vacuum systems withstand humidity and solvent traces. Furthermore, purity in process is a must, so dry compressing pumps such as VARODRY, LEYVAC, DRYVAC and RUVAC avoid back streaming of oil particles towards the coils in a batch dryer or an in-line dryer.
Specialized vacuum solutions have been developed such as the Leybold DV4000, the DRYVAC DV650-LIB and the VARODRY-LIB for effective and reliable pumping of NMP.