In the first step, the active material (usually lithium metal oxides) is mixed with solvents and binders to form a so-called "slurry". To achieve the highest possible homogeneity, purity and viscosity of the slurry, the mixing process takes place in a vacuum. The vacuum atmosphere prevents air inclusions and contamination of the slurry. This plays an important role in the quality of the final product. Reliable pumping systems are important here in order to achieve a high level of process reliability. Depending on the solvent, ATEX pumps may be necessary. The size of the slurry mixer determines the pump size. Leybold offers a wide range of both dry and oil-sealed pumps for this step in the process. 

In further steps of electrode production, the copper or aluminium foils are coated with the electrode material and finally, after further steps, are rolled and separated into so-called daughter coils. These daughter coils are dried under a vacuum seal and heat to remove any solvent and water residue. The electrodes must be absolutely dry in order to obtain a high-quality product. This is only possible in a vacuum, as the solvent residues and water molecules present in the daughter coils diffuse only under a vacuum seal. During a typical drying time of approximately 12 to 48 hours, the residual moisture and solvent residues are removed from the daughter coils in vacuum furnaces. A stable and controllable vacuum seal is essential for process quality. Vacuum drying takes place in a mostly individual process with specific temperature-pressure curves, usually between 0.1 - 30 mbar and 100° - 150°C. Depending on the size of the battery production, either single ovens or in-line ovens are used. This process determines the pump selection, and Leybold offers the perfect pump configuration for a wide variety of processes. Depending on the requirements, various oil-sealed or dry pumps can be used to achieve the highest possible levels of process purity and minimized investment and operation costs.