VFB 电解质的实验室测试方法.pdf

1、IFBF 2025:N.Roznyatovskaya,J.Noack,M.Fhl,Y.Seiler,F.GeierLaboratory test methods for vanadium flow battery electrolyte:towards the development of standards for vanadium electrolyteOffenProcedure for standard development(ISO/IEC Directive Part 1)25.06.2025 Fraunhofer ICTSeite 22.WD Preparatory expert

2、 consensuswithin workinggroup(TC21/JWG 7)1.NPProposal to start a new project3.CDCommitteecommittee consensus(IEC TC21)5.FDISApprovalYES or NO vote4.DIS Enquirynational consensus6.Publication International StandardReview IS is reviewed and/or revisedWith-drawal IS can be withdrawnJoint project:StaVEN

3、o-Standardization of vanadium electrolyte solutions for flow batteries:Analytical methods for vanadium electrolytes and standardization work“Electrolyte =vanadium Vn+sulphates+sulphuric acid(free acid,H+)+phosphoric acid+impuritiesCVCSCPCommon requirements for commercial V3.5+electrolyte samples(6 s

4、uppliers from USA,Europe,China):V3.5+electrolyte based on sulfuric acid(not other acids or mixture as a matrix)CV 1.5-1.8M,CS 3.7 4.5M,V3+/4+mol.ratio 1:1(it means+3.5)No exact presets for inorganic impuritiesOffenElectrolyte metricsV3.5+SOC-50%“(-)V3+/2+SOC 10-90%(+)V5+/4+SOC 10-90%MethodsConcentra

5、tions of the main components(CV,CS,CP )CV,CS,CP CV*,CS*CV*,CS*Potentiom.titration,ICP-MS,ICP-OES,IC,gravimetry,therm.titrationConcentrations of inorganic impurities(Cimpur.)CimpurCimpur*Cimpur*ICP-MSConcentration of sulfur(IV)impurities(SO2)?gas(ppm range)-Semi-quantitative gas tube sensorsConcentra

6、tions of organic impurities(TOC)failed-TOC-analyzerInsoluble residuesparticles?Filtration using fine porosity filterPhysical properties:conductivity,density,viscosity (,d,),d,d,d,Conductometry,density measurement,viscosimetry(Ubbelohde)Chemical stability at high SOC/high TC(V2O5)-solid phaseVisual i