Li-ion batteries pose an integral part of todays energy economics but are expected to run into limitations of achievable energy density in the future, motivating the investigation of different technologies, e.g., solid-state batteries. In both, conventional Li-ion and solid-state batteries, the layered oxides LiNi1-xMnyCo1-x-yO2 (NCM) are the most utilized and thoroughly investigated cathode active material. Nonetheless, among other things, the relative scarcity of Co and Mn, and resulting material costs make the search for alternatives a promising endeavour. The cathode active material Li2FeS2 offers a cost-effective alternative given the large abundance of both iron and sulfur, comparable to the promised benefits of other alternative chemistries such as LiFePO4 (LFP) and Li-S. At the same time, moving from NCM to Li2FeS2 means higher mechanical compatibility, and moving from high-to lowpotential electrodes promises better alignment with the stability window of the state-ofthe-art sulfur-based solid-electrolytes. In addition to these benefits, Li2FeS2 on paper offers a two electron reaction following full delithiation from Li2FeS2 to FeS2. Considering this range, the theoretical capacity of Li2FeS2 amounts to 400 mAh•g -1 , exceeding the theoretical capacity of NCM811 that is ≈280 mAh g -1 but coming at the disadvantage of a lower potentials of operation.