Hydrothermally synthesized bimetallic disulfide CoxNi1-xS2 as high-performance cathode material for lithium thermal battery

The hollow microspherical structure cathode materials of bimetallic disulfide Co x Ni 1-x S 2 ( x varied from 0.1 to 0.5) for lithium thermal battery were synthesized by hydrothermal method. The structure, morphology, and composition of the hollow Co x Ni 1-x S 2 were evaluated by field emission scanning electron microscope (FESEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD). The thermal stability was assessed by differential thermal analyzer (DTA). The thermal battery fabricated with Co x Ni 1-x S 2 as cathode active material and LiB as anode exhibits the good electrochemical performance at 450 °C. Especially when x  = 0.1, the initial discharge voltage reached 2.037 V, and specific capacity was 297.4 mA h g −1 at cut-off voltage of 1.5 V during constant current discharge. The bimetal disulfide material also presented advantages of reducing the internal resistance of the single cell.