Alkali-Metal-Ion Batteries

Secondary batteries (accumulators) are electrochemical energy storage devices that store and release charge through electrochemical (redox) reactions. Lithium-ion batteries (LIBs for short) in particular have become an integral part of modern life, powering everything from small electronic devices to electric vehicles (EVs). They essentially consist of three main components: a cathode, an anode and an electrolyte. The electrolyte, often referred to as the “blood circuit” of a battery, plays a central role in transporting ions between the electrodes and has a major impact on the performance, safety and lifespan of the battery.

We are interested in the detailed study of the complex interaction of salts, solvents and additives to develop electrolytes for modern energy storage technologies. Our work aims to overcome the current limitations of advanced battery systems by developing electrolytes that provide a broader electrochemical stability window to enable the use of high voltage cathodes (e.g. high nickel cathodes), reduce flammability and safety risks, form stable interphases on electrodes and operate optimally over a wider temperature range.

In addition to lithium-ion batteries, we are concentrating in particular on sodium- and potassium-ion-based systems, which can offer an advantage over LIBs in terms of raw materials and costs. Research into sustainable, i.e. low-fluorinated and biomass-based electrolyte components is also of particular importance. Among other things, this approach should improve the recyclability of electrolytes (see Recycling).