EIS in Wetting of Lithium-ion Battery Materials

To make lithium-ion batteries, packaged cells need to be filled with an electrolyte so that lithium ions can move freely between cathode and anode. After this filling step the nearly finished battery needs time to absorb the electrolyte into all its pores before it can be charged for the first time (called formation). This waiting period is crucial in order to achieve a high-quality product with a long service life. In today’s industrial production, this waiting period, also called wetting, is merely estimated based on experience and validated with cell tests. This application note addresses the question of how to reduce, or even remove this bottleneck in production, and therefore lower the costs significantly.