The shuttle effect and slow conversion rate of lithium polysulfides(LiPSs)have become the main ob-structs to the development of lithium-sulfur(Li-S)batteries.Herein,the low cost metal-organic frame-works derived nitrogen-doped carbon nanosheets embedded with zinc selenide nanoparticles(ZnSe/NC nanosheets)were designed and synthesized for Li-S batteries.As the LiPSs trapping-layer,these nanocom-posites provide some key benefits:(1)The nitrogen doping changes local electron distribution in the carbon nanosheets,thus the electrical conductivity is greatly improved for facilitating the transport of electrons/ions.(2)Nitrogen atoms and ZnSe nanoparticles play an important role in anchoring the LiPSs via chemical interactions.(3)The remarkable catalytic activity of ZnSe nanoparticles can accelerate the redox kinetics of LiPSs.As a result,the Li-S battery with the ZnSe/NC nanosheets modified separator exhibits ultralong lifespan over 1500 cycles with a small capacity loss of only 0.046％per cycle at 1 C,which is superior over those reported values.Furthermore,the Li-S battery with a high sulfur loading of 4.71 mg cm-2 can still maintain a high areal capacity of 4.28 mAh cm-2 after 50 cycles.This work provides a new route to the design of multifunctional low cost and high-performance separators for re-markably stable Li-S batteries.

National Laboratory of Solid State Microstructures,Collaborative Innovation Center of Advanced Microstructures,College of Engineering and Applied Sciences,Nanjing University,Nanjing 210093,China;Haian Institute of High-Tech Research,Nanjing University,Nanjing 226600,China

[1]Biao Wang;Dongyue Sun;Yilun Ren;Xiaoya Zhou;Yujie Ma;Shaochun Tang;Xiangkang Meng-.MOFs derived ZnSe/N-doped carbon nanosheets as multifunctional interlayers for ultralong-Life lithium-sulfur batteries)[J].材料科学技术（英文版）,2022(30):97-104

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