preparation and properties of sulfonated poly(fluorenyl

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1、PreparationandPropertiesofSulfonatedPoly(fluorenyletherketone)MembraneforVanadiumRedoxFlowBatteryApplicationDongyangChen,ShuanjinWang*,MinXiao,YuezhongMeng*StateKeyLaboratoryofOptoelectronicMaterialsandTechnologies/TheKeyLaboratoryofLow-carbonChemistry&En

2、ergyConservationofGuangdongProvince,SunYat-SenUniversity,Guangzhou510275,PRChinaABSTRACTInordertodevelopnovelmembranesforvanadiumredoxflowbattery(VRB)withlowself-dischargerateandlowcost,sulfonatedpoly(fluorenyletherketone)(SPFEK)wassynthesizeddirectlyviaa

3、romaticnucleophilicpolycondensationofbisphenolfluorenewith60%sulfonateddiflurobenzophenoneand40%difluorobenzophenone.TheSPFEKmembraneshowsthelowerpermeabilityofvanadiumions.TheopencircuitvoltageevaluationdemonstratesthattheSPFEKmembraneissuperiortoNafion1

4、17membraneinself-dischargetest.Bothenergyefficiencies(EE)andpowerdensitiesoftheVRBsinglecellbasedontheSPFEKmembranearehigherthanthoseoftheVRBwithNafion117membraneatthesamecurrentdensities.Thehighestcoulombicefficiency(CE)ofVRBwithSPFEKmembraneis80.3%while

5、thehighestCEoftheVRBwithNafion117membraneis77.0%.TheSPFEKmembraneshowsthecomparativestabilitytoNafion117membraneinVO2+electrolyte.TheexperimentalresultssuggestthatSPFEKmembraneisapromisingionexchangemembraneforVRB.28Keywords:Vanadiumredoxflowbattery;Sulfo

6、natedpolymer,Ionexchangemembrane.Correspondingauthor:mengyzh@mail.sysu.edu.cn(Y.Z.Meng)orwangshj@mail.sysu.edu.cn(S.J.Wang).281.IntroductionVanadiumredoxflowbattery(VRB)hasbeenattractingmoreandmoreattentionssinceitwasfirstproposedbyM.Skyllas-Kazacosandhis

7、co-workers[1].Itisapromisingelectrochemicalenergystoragebatteryforitshighpowerdensity,variousloadinglevelandconsiderableenergyefficiency.ItemploysV2+/V3+andVO2+/VO2+redoxcouplesinsulfuricacidsolutionasitsnegativeandpositivehalf-cellelectrolytesandanionexc

8、hangemembraneasitsseparator.Electrolytesstoredintwotankswerepumpedandcirculatedthroughthestackwhereelectrochemicalreactionoccurred.Inthechargeanddischargeprocesses,thefollowingreactionhappened:Positivehalf-cell:(Eq.