Abstract
CoS2 with high thermal stability is commonly used as cathode material for thermal batteries, however, its practical performance is limited by insufficient electrochemical reactions during discharge. Enlighted by metal-doping that can regulate the electronic environment and lattice structure, high-energy Co0.8Fe0.2S2 is successfully prepared by solid-state methods. Remarkably, with a current density of 0.3 A·cm−2 at a cutoff voltage of 1.42 V under 550 °C, Co0.8Fe0.2S2 exhibits excellent performance with a prolonged discharge platform and decreased resistance (0.23 Ω), generating an ultrahigh specific capacity of 652 mAh·g−1, which is 31 % higher than that of pure CoS2. Our research indicates that Co0.8Fe0.2S2 is suitable for high-energy and high-temperature thermal batteries. The feasibility of solid-state synthesis of pure-phase bimetallic disulfides has been verified as well, paving the way for industrial application of Co0.8Fe0.2S2.
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