FeS₂-CoS₂多相硫化物正极材料电化学性能研究

FeS₂-CoS₂ multiphase cathode materials for thermal battery were prepared by physical-mechanical mixing method, and the effects of iron and cobalt contents on the electrochemical property of the thermal battery were discussed. The component content, microstructure and surface morphology of mixed disulfide are analyzed by using X-ray diffraction (XRD) and scanning electron microscopy(SEM). Compared with the single-phase sulfide material, the iron-cobalt composite material not only maintains its high voltage, but also prolongs the discharge duration. SEM experimental result shows that the morphology of cathode material is changed after discharging. Since the lithium-ion channels are covered with the products during the reaction process, the channels are decreased. When the ratios of iron to cobalt are 1:4 and 1:0.25, the maximum discharge voltages of a single battery are 1.67 V and 1.72 V, respectively. Meanwhile, the specific capacity of the single battery is 250.7 mA•h/g and 167.1 mA•h/g when the cut-off voltage is 1.25 V, which is higher than that of other multiphase sulfide materials.