At the Helmholtz Institute Münster (HI MS), jointly founded by the University of Münster, RWTH Aachen University and Forschungszentrum Jülich and operated as a branch office of Forschungszentrum Jülich, work focuses on electrolytes – the most important component in all batteries. Electrolytes are at the heart of research at HI MS, with the official name of Ionics in Energy Storage. HI MS will make a decisive contribution towards accelerating the development of storage technologies. The institute pools and focuses the expertise of all three partners in order to develop concepts for future stationary electrochemical storage. Münster Electrochemical Energy Technology (MEET) at WWU Münster is an institute with an international reputation in the field of rechargeable lithium and lithium-ion batteries with liquid and polymer electrolytes. This outstanding competence in the field of electrochemistry is complemented by Forschungszentrum Jülich’s expertise in materials science. At Jülich, priority is given to the investigation, synthesis, and development of cation- and anion-conducting ceramics. The world-class research at RWTH Aachen University rounds off the cooperation between universities and a research establishment for the characterization of large cells and anion-conducting ceramics.