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Description:
Given the inherent performance limitations of intercalationbasedlithium-ion batteries, solid-state conversion batteries arepromising systems for future energy storage. A high specific capacityand natural abundancy make iron disulfide (FeS2) a promisingcathode active material. In this work, FeS2 nanoparticles wereprepared solvothermally. By adjusting the synthesis conditions,samples with average particle diameters between 10 nm and 35 nmwere synthesized. The electrochemical performance was evaluated insolid-state cells with a Li-argyrodite solid electrolyte. While thereduction of FeS2 was found to be irreversible in the initial discharge,a stable cycling of the reduced species was observed subsequently.A positive effect of smaller particle dimensions on FeS2 utilization wasidentified, which can be attributed to a higher interfacial contact areaand shortened diffusion pathways inside the FeS2 particles. Theseresults highlight the general importance of morphological design toexploit the promising theoretical capacity of conversion electrodes insolid-state batteries.