Abstract
Lithium-sulfur (Li-S) batteries have attracted much attention because of their potential as a new technology for high-energy batteries. However, the “shuttle effect” of polysulfide intermediates and poor conductivity of sulfur active species limit the development of Li-S batteries. Herein, a novel core-shell and hollow meso@microporous carbon matrix (ZIF-8(C)@CMK-3) is designed, which wraps N-doped carbon shell in the outer layer of ordered mesoporous CMK-3 through in-situ carbonization of thin zeolitic-imidazolate framework ZIF-8 layer. The combination of advantages of unique pore size, N-doping and core-shell architecture renders the resultant carbon matrix with enhanced electron/Li+ transport and the synergistic chemical/physical polysulfide anchoring. As a result, ZIF-8(C)@CMK-3 @S exhibits high reversible capacity (1597.2 mAh/g at a current density of 0.1 C) and well stability (596 mAh/g after 300 cycles at 2 C), and the fading rate per cycle capacity is 0.11%. The results indicated ZIF-8(C)@CMK-3 has a great potential to be used as efficient sulfur immobilizer for Li-S batteries.
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