Bimetallic iron-cobalt disulfide as efficient cathode material for high-performance thermal batteries

Abstract

Bimetallic Fe-Co disulfide with single phase generally represents enhanced thermal battery performances. In this work, binary iron-cobalt disulfide (FeCoS₂) is synthesized via high-temperature thermal sintering of sulfur and coprecipitated precursor. The as-prepared FeCoS₂ possesses nanosized particles with single phase. The uniform distribution of Fe and Co atoms induces strong synergistic effect, significantly improving the thermal stability and electrochemical performances of FeCoS₂. At a current density of 100 mA cm^-2 and a cut-off voltage of 1.4 V, the discharge capacity of FeCoS₂ reaches to 626.3 mAh g^-1, which is higher than that of the corresponding mono-disulfides and their physical mixture. These findings indicate that the present FeCoS₂ is suitable to be used as cathode material for high-performance thermal battery, which also provides valuable insight for the preparation of multi-metallic disulfides.