PreparationofHighly-CyclizedSulfurizedPolyacrylonitrileforLithium-SulfurBatteriesXuanJi1#,Jia-YuWang1#,An-BangWang2,Wei-KunWang2*,MingYao1*,Ya-QinHuang1*(1.BeijingKeyLaboratoryofElectrochemicalProcessandTechnologyforMaterials,KeyLaboratoryofBiomedicalMaterialsofNaturalMacromolecules,MinistryofEducation,BeijingUniversityofChemicalTechnology,Beijing100029,P.R.China;2.ResearchInstituteofChemicalDefense,Beijing100191,P.R.China)Received:2022-09-15,Revised:2022-10-06.#Theseauthorscontributedequallytothisworkandshouldbeconsideredasco-firstauthors.*Correspondingauthor,Wei-KunWang,Tel:(86-10)64438266,E-mail:wangweikun2002@163.comMingYao,Yaom-ing@mail.buct.edu.cn,Ya-QinHuang,Tel:(86-10)64438266,huangyq@mail.buct.edu.cnDOI:10.13208/j.electrochem.2219010[Article]http://electrochem.xmu.edu.cnCiteas:JiX,WangJY,WangAB,WangWK,YaoM,HuangYQ.Preparationofhighly-cyclizedsulfurizedpolyacrylonitrileforlithium-sulfurbatteries.J.Electrochem.,2022,28(12):2219010.Abstract:Sulfurizedpolyacrylonitrile(SPAN)isregardedasanattractivecathodecandidateoflithium-sulfur(Li-S)batteriesforitsnon-dissolutionmechanismandeffectivealleviationofpolysulfidesshuttlingissueinLi-Sbatteries,displayinghighutilizationofcathodeactivematerial,outstandingcyclestabilityandstructuralstability.However,therelationbetweencyclizationdegreeandcy-clestabilityofSPANisstillunveiled.Inthiswork,SPAN-C-Vcompositesweresynthesizedbyco-introductionofCuSO4andzincn-ethyl-n-phenyldithiocarbamate(ZDB)intheco-heatingofsulfurandpolyacrylonitrile.Theco-introductionofCuSO4andZDBreducedthecyclizationreactiononsettemperatureofPANwhileincreasedtheC—C/C=CwithinSPAN-C-V,thusledtoanin-creaseinthedegreeofcyclizationofSPAN-C-V,achievingexcellentelectrochemicalperformancebysimultaneouslyimprovingthecyclizationdegreeandincreasingthecontentofsulfur.TheSPAN-C-Vexhibitedaninitialreversiblecapacityof805mAh·g-1and601mAh·g-1after100cycleswiththecapacityretentionrateof93%at0.2C(1C=600mAh·g-1).ThefocusonthecyclizationdegreeofSPANprovidesanenlightenment...
