Constructing Li₂C₄O₄ and conductive carbon synergistic Double-Layer modified separator for Kinetics-Enhanced Li–S batteries

Lithium-sulfur (Li-S) batteries have been considered as satisfying energy storage devices, but the electrochemical performance of Li-S batteries is severely hindered by the shuttle effect and the sluggish sulfur redox kinetics. Herein, a double-layer separator modified with Li₂C₄O₄ and Super P through a simple coating method is prepared. The composite Li₂C₄O₄-Super P exhibits great adsorption on polysulfides. Besides, the combination of Li₂C₄O₄ and Super P can reduce charge transfer resistance and improve Li⁺ transport ability. The Li₂C₄O₄-Super P@PP cell shows an extremely low capacity decay rate of 0.045 % after 800 cycles at 1C and a fantastic capacity of 588.1 mAh·g⁻¹ under the high rate of 5C.