Multi-Dimensional Composite Frame as Bifunctional Catalytic Medium for Ultra-Fast Charging Lithium-Sulfur Battery  

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

机构地区：[1]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 [2]School of Physical Science and Technology,Lanzhou University,Lanzhou 730000,People’s Republic of China

出　　处：《Nano-Micro Letters》2022年第12期91-105,共15页纳微快报（英文版）

基　　金：This work was financially supported by the Gansu Provincial Natural Science Foundation of China(Nos.21JR7RA493,17JR5RA198,2020HZ-2,21JR7RA470);the Cooperation project of Gansu Academy of Sciences(2020HZ-2);the Fundamental Research Funds for the Central Universities(Nos.lzujbky-2018-119,lzujbky-2018-ct08,lzujbky-2019-it23);Key Areas Scientific and Technological Research Projects in Xinjiang Production and Construction Corps(No.2018AB004);Hubei University of Arts and Science(No.2020kypytd002);Xiangyang Science and Technology Research and Development(No.2020YL09).

摘　　要：The shuttle effect of soluble lithium polysulfides(LiPSs)between electrodes and slow reaction kinetics lead to extreme inefficiency and poor high current cycling stability,which limits the commercial 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 CoS_(2) nanoparticles on alkali-treated MXene nanosheets and carbon nanotubes.Both experiments 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 Li_(2)S 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(7.5μL mg^(−1))is achieved.

关 键 词：MXenes Transition metal sulfides Lithium-ion transference Bifunctional catalysis Reaction kinetics 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ426[化学工程]