Cooperative catalytic platinum species accelerating polysulfide redox reactions for Li-S batteries  

作　　者：Yujie Qi Ning Chai Qinhua Gu Junnan Chen Zhaofeng Zhai Ming Lu Yiming Niu Nan Huang Xia Zhang Bingsen Zhang 

机构地区：[1]Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,Liaoning,China [2]School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,Liaoning,China [3]Department of Chemistry,College of Science,Northeastern University,Shenyang 110819,Liaoning,China [4]The Joint Laboratory of MXene Materials,Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education,Key Laboratory of Preparation and Application of Environmental Friendly Materials of the Ministry of Education,Jilin Normal University,Changchun 130103,Jilin,China

出　　处：《Journal of Energy Chemistry》2023年第12期123-135,I0005,共14页能源化学（英文版）

基　　金：the financial support provided by the National Natural Science Foundation of China (51932005, 22072164);the Liaoning Revitalization Talents Program (XLYC1807175);the Research Fund of Shenyang National Laboratory for Materials Science;the IMR Innovation Fund (2023PY10);the Natural Science Foundation of Liaoning Province (2023-BS-013);the Science and Technology Research Project of Education Department of Jilin Province (JJKH20210453KJ)。

摘　　要：The shuttle effect derived from diffusion of lithium polysulfides(LiPSs) and sluggish redox kinetic bring about poor cycling stability and low utilization of sulfur,which have always been the key challenging issues for the commercial application of lithium-sulfur(Li-S) batteries.Rational design of cathode materials to catalyze Li_(2)S dissociation/nucleation processes is an appealing and valid strategy to develop high-energy practical Li-S batteries.Herein,considering the synergistic effect of bidirectional catalysis on LiPSs conversion and enhanced chemical immobilization for LiPSs by heteroatom doping,Pt nanoparticles loaded on nitrogen-doped carbon spheres(Pt/NCS composites) were constructed as cathode materials.According to the dynamic evolution of Pt catalysts and sulfur species,Pt~0 and Pt^(2+) species were identified as active species for the accelerated dissociation and nucleation of Li_(2)S,respectively.Meanwhile,in-situ Raman results demonstrated the expedited conversion of sulfur species resulted from bidirectional catalysis of active Pt species,corresponding to boosted redox kinetics.Consequently,Pt/NCS cathode exhibited improved long-term cyclability with high initial capacity,along with enhanced rate capability.This work provides a facile approach to construct cathode materials with bidirectional catalysis on Li_(2)S dissociation/nucleation,and sheds light on a more global understanding of the catalytic mechanism of metal catalysts during LiPSs conversion.

关 键 词：Lithium-sulfur batteries Platinum species N-doped carbon spheres Bidirectional catalysis Polysulfide conversion 

分 类 号：TQ032.4[化学工程] TM912[电气工程—电力电子与电力传动]