Abstract
Lithium-sulfur batteries have attracted much attention due to their low cost, environment-friendliness, and high energy density. However, it is hard to get a satisfactory performance due to the low conductivity of sulfur, the volume changes from sulfur to lithium sulfides during the cycling, and the shuttle effect of the intermediate product of polysulfides. Here, we propose a sulfur host material based on the composite of conductive metal–organic frameworks (Ni3(HITP)2) and graphene oxide. This composite material combines the unique pore structure of Ni3(HITP)2 and the improved conductivity. The stacked one-dimensional channels could effectively improve the utilization of S, and the good conductivity could enhance the charge transfer of the electrode. The rich Lewis acid sites of Ni3(HITP)2 could effectively adsorb the polysulfides around the open metal sites that help suppress the shuttle effects. This rational design improves the rate performance and cycle stability of lithium-sulfur batteries.
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