Abstract
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.
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