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

[Display omitted] • The double-layer structure of Li 2 C 4 O 4 -Super P modified separator was constructed. • The great adsorption and catalytic ability are achieved by the synergistic effect of Li 2 C 4 O 4 and Super P. • The Li 2 C 4 O 4 -Super P modified separator exhibits fantastic cycling performance. 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 Li 2 C 4 O 4 and Super P through a simple coating method is prepared. The composite Li 2 C 4 O 4 -Super P exhibits great adsorption on polysulfides. Besides, the combination of Li 2 C 4 O 4 and Super P can reduce charge transfer resistance and improve Li+ transport ability. The Li 2 C 4 O 4 -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. [ABSTRACT FROM AUTHOR]