The development of lithium solid-state batteries (ASSB) is considered the next major milestone in lithium-ion technology. Compared to conventional lithium-ion batteries, the liquid electrolyte is replaced by an ion-conducting solid. The use of these solid electrolytes in combination with lithium metal anodes offers advantages such as higher energy density and increased operational safety. In the future, this should enable larger storage capacities and faster charging processes. At the Fraunhofer Center for Energy Storage and Systems ZESS, scientists from three Fraunhofer Institutes are researching and developing a prototypical and flexible production chain from the material to the battery cell.