Strong lithium polysulfides chemical trapping of TiC-TiO2/S composite for long-cycle lithium-sulfur batteries

In our study, TiC-TiO 2 /S composite was successfully prepared with a simple and effective method. For this special micro-mesoporous structure, TiC-TiO 2 can be used as an efficient sulfur storing material, and also restrain the volume expansion of sulfur to a certain degree for its suitable specific surface area. TiO 2 and TiC can suppress the diffusion of polysulfides due to their strong interaction with polysulfides . At the same time, TiC also can remedy the nonconductive defect of sulfur for its good conductivity. With the help of above advantages, the TiC-TiO 2 /S cathode delivers an initial discharge specific capacity of 1218 mAh g −1 at 1 C (1 C = 1675 mA g −1 ) with the sulfur loading of 1.5 mg cm −2 . And when cycles at 0.5 C, a stable capacity of 714 mAh g −1 can be maintained after 500 cycles accompanied with the sulfur loading of 1.1 mg cm −2 .