A reduction of the inactive components can increase the energy density and reduce the production cost of Li-ion batteries. But an effective reduction of the binder amount also negatively affects the adhesion of the electrode. In this work, slot‐die coating of a primer layer for Li‐Ion anodes is investigated. It is shown that the use of a primer layer with only 0.3 g m⁻² can increase the adhesive force by a factor of 5 as well as the cell performance for anodes with low binder content. The process limits for a stable, defect-free primer coating are investigated at coating speeds of up to 550 m min⁻¹. The limits coincide both for a setup without a vacuum box and with a vacuum box with theory‐based equations. By using a vacuum box, the minimum wet film thickness can be reduced by half.

High-Speed Coating of Primer Layer for Li-Ion Battery Electrodes by Using Slot-Die Coating

First published: 02 July 2020