The shuttle effect of soluble lithium polysulfides(LiPSs)between electrodes and slow reaction kinetics lead to extreme ineffi-ciency and poor high current cycling stability,which limits the com-mercial application of Li-S batteries.Herein,the multi-dimensional composite frame has been proposed as the modified separator(MCCoS/PP)of Li-S battery,which is composed of CoS2 nanoparticles on alkali-treated MXene nanosheets and carbon nanotubes.Both experi-ments and theoretical calculations show that bifunctional catalytic activity can be achieved on the MCCoS/PP separator.It can not only promote the liquid-solid conversion in the reduction process,but also accelerate the decomposition of insoluble Li2S in the oxidation process.In addition,LiPSs shuttle effect has been inhibited without a decrease in lithium-ion transference numbers.Simultaneously,the MCCoS/PP separator with good LiPSs adsorption capability arouses redistribution and fixing of active substances,which is also beneficial to the rate performance and cycling stability.The Li-S batteries with the MCCoS/PP separator have a specific capacity of 368.6 mAh g-1 at 20C,and the capacity decay per cycle is only 0.033％in 1000 cycles at 7C.Also,high area capacity(6.34 mAh cm-2)with a high sulfur loading(7.7 mg cm-2)and a low electrolyte/sulfur ratio(7.5 μL mg-1)is achieved.

Shuhao Tian;Qi Zeng;Guo Liu;Juanjuan Huang;Xiao Sun;Di Wang;Hongcen Yang;Zhe Liu;Xichao Mo;Zhixia Wang;Kun Tao;Shanglong Peng

National and Local Joint Engineering Laboratory for Optical Conversion Materials and Technology,School of Materials and Energy,Lanzhou University,Lanzhou 730000,People's Republic of China;School of Physical Science and Technology,Lanzhou University,Lanzhou 730000,People's Republic of China

纳微快报（英文）

[1]Shuhao Tian;Qi Zeng;Guo Liu;Juanjuan Huang;Xiao Sun;Di Wang;Hongcen Yang;Zhe Liu;Xichao Mo;Zhixia Wang;Kun Tao;Shanglong Peng-.Multi-Dimensional Composite Frame as Bifunctional Catalytic Medium for Ultra-Fast Charging Lithium-Sulfur Battery)[J].纳微快报（英文）,2022(12):91-105

ineffi,MCCoS

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