La-Doped BaSnO₃/Multi-walled Carbon Nanotube Modified Separator: Synthesis and Application in Lithium-Sulfur Battery

Herein, an interlayer was constructed on the commercial separator Celgard 2500 (PP) by doctor blade coating a mixture slurry of perovskite oxide lanthanum doped barium stannate (LBSO) that was prepared by co-precipitation method and multi. walled carbon nanotubes (MCNT). The as-obtained modified separator was named LBSO/MCNT/PP. The lithium-sulfur battery using the modified separator delivered an initial discharge specific capacity up to 1 433 mAh.g(-1) at 0.1C and a capacity decay rate of 0.114% per cycle over 300 cycles at 1C. As the current density was increased to a 3C rate, a discharge specific capacity of 764 mAh.g(-1) can still be maintained, showing excellent rate capability and cycling stability, which is ascribed to the effective inhibition of the interlayer towards the shuttle of polysulfides.