In this research, hollow Co/NC@NC catalysts were successfully prepared and applied to modify the separator in Lithium-Sulfur (Li-S) system. Among this composite, carbon films from dopamine (DA) carbonation can enhance the electrical conductivity of material, and Co species adsorb lithium polysulfide (LiPSs), paving the way for further catalytic conversion of LiPSs to Li2S, which can greatly limit the shuttle effect. Moreover, the hollow structure not only contributes more active sites, but also promotes the diffusion of Li+, which is significant for the improvement of battery performance. By taking advantage of the coating material components and structure, Li-S cells achieve a high initial capacity (1098 mAh/g at 0.2C), impressive rate performance (640 mAh/g at 2C and 420 mAh/g at 4C), and superior cycling stability (826 mAh/g obtained after 100 cycles at 0.5C).
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