A semi-immobilized sulfur-rich copolymer backbone with conciliatory polymer skeleton and conductive substrates for high-performance Li-S batteries  

作　　者：Tianpeng Zhang Zihui Song Jinfeng Zhang Wanyuan Jiang Runyue Mao Borui Li Siyang Liu Xigao Jian Fangyuan Hu 

机构地区：[1]School of Materials Science and Engineering,State Key Laboratory of Fine Chemicals,Frontiers Science Center for Smart Materials Oriented Chemical Engineering,Technology Innovation Center of High Performance Resin Materials(Liaoning Province),Key Laboratory of Energy Materials and Devices(Liaoning Province),Dalian University of Technology,Dalian 116024,Liaoning,China [2]School of Chemical Engineering,State Key Laboratory of Fine Chemicals,Frontiers Science Center for Smart Materials Oriented Chemical Engineering,Technology Innovation Center of High Performance Resin Materials(Liaoning Province),Key Laboratory of Energy Materials and Devices(Liaoning Province),Dalian University of Technology,Dalian 116024,Liaoning,China

出　　处：《Journal of Energy Chemistry》2023年第6期510-518,I0012,共10页能源化学（英文版）

基　　金：the support from National Outstanding Youth Science Fund (52222314);the CNPC Innovation Found (2021DQ02-1001);the Liao Ning Revitalization Talents Program (XLYC1907144);the Xinghai Talent Cultivation Plan (X20200303);the Fundamental Research Funds for the Central Universities (DUT22JC02,DUT22LAB605)。

摘　　要：Sulfur-rich polymers have gained a great deal of attention as the next-generation active materials in lithium-sulfur(Li-S)batteries due to their low cost,environmental compatibility,naturally sulfur uniform dispersion,and distinctive structure covalently bonding with sulfur atoms.However,the poor electrical conductivity and undesirable additional shuttle effect still hinder the commercial application of sulfur-rich polymers.Herein,we report a flexible semi-immobilization strategy to prepare allylterminated hyperbranched poly(ethyleneimine)-functionalized reduced graphene oxide(A-PEI-EGO)as sulfur-rich copolymer backbone.The semi-immobilization strategy can effectively reconcile the demand for polymer skeleton and conductive substrates through forming quaternary ammonium groups and reducing oxygen-containing functional groups,resulting in enhanced skeleton adsorption capacity and substrate electronic conductivity,respectively.Furthermore,the stable covalent bonding connection based on polymer molecules(A-PEI)not only completely prevents the additional shuttle effect of lithiation organic molecules and even sulfur-rich oligomers,but provides more inverse vulcanization active sites.As a result,the as-prepared A-PEI-EGO-S cathodes display an initial discharge capacity of1338 m A h g^(-1)at a rate of 0.1 C and an outstanding cycling stability of 0.046%capacity decay per cycle over 600 cycles.Even under 6.2 mg cm^(-2)S-loaded and sparing electrolyte of 6μL mg^(-1),the A-PEI-EGO-S cathode can also achieve a superior cycling performance of 98%capacity retention after 60 cycles,confirming its application potential.

关 键 词：Li-S batteries Sulfur-rich polymers Semi-immobilization strategy Demand reconciliation Outstanding cycling stability 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ317[化学工程—高聚物工业]