全釩液流电池用稳定高浓度电解液的研究

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1、就察诧工大学硕士学位论文裁均能提高V(III)硫酸溶液的热稳定性，但CV帮EIS表甓草酸，草酸铵，乙二胺四乙酸等含羧基的有机添加削比葡萄糖，D一果糖，0c。乳糖等含羟基的有机添加剂更好的改善V(IiI)硫酸溶液的电化学活性和可逆性。这是因为．COOH比．C—OH更容易离去H，更有剩于V(II)／V(III)电极反应的进行。作为正极活性物质的五价钒离子在高温或浓度太高时会析国红色沉淀。本论文选取了～系列无机物，有机物和表面活性剂来考察了其对V(V)热稳定性的影响，并对其枫理傲了初步分析。结果表露：加入l％的硫酸钠，甜菜碱，葡萄糖，甘油等均对V(V)溶液有

2、缀好豁稳定侔用，在50℃下稳定可以达到30天眺上。通过CV和EIS表啖硫酸钠可以提高V(IV)／V(V)电极反应的可逆性，葡萄糖可以提高电池的容量。关键词：电渣储麓，全钒液流电池，电解液，添加刹ABSTRACTINVESTIGATIONoFHIGHCoNCENTRATEDELECTROLYTEFORALLVANADIUMFLoWBATTERYToday，theelectricalindustriesarefacingnewchallengesasthemarketisbeingliberalizedandderegulatedinmanycountri

3、es．Electricitystorageisundoubtedlyadisruptivetechnologythatwillplay,inthenearfuture，amajorroleintheenergyexploitationandusage。All—vanadiumredoxflowbatteryhasrecentlyreceivedconsiderateattentionasitpossessesmanyfeaturesthatprovideforlong1ife，flexibledesign，highreliabilityandlowop

4、erationandmaintenancecosts．Inthispaper,wemainlydiscussedpreparationofelectrolyteanditsperformance．preparationofhighconcentratedelectrolyte,analysisofelectrolyte，thefundamentalperformanceofelectrolyte，andstabilityandelectrochemicalperformanceofcatholyteandanolytewerestudiedindeta

5、ilinthisdissertation．Themainpointscanbesummarizedasfollows：ThefourdifferentvalencesofhighconcentratedV-H2S04solutionscanbepreparedbyelectrolysisofVOS04solutions．Thecyclicvoltammetry(CV)testsshowthatthebestconcentrationofsulphuricacidiS3Mforvanadiumelectrolyte；andthepositiveandne

6、gativereactionareelectrochemicalquasi—reversibleandarecontrolledbydiffusion．TheconductivitytestshowsthatasthevanadiumconcentrationiSincreased，theelectrolyteconductivitydecreasesforeachofthevanadiumoxidationstates．Sotothevanadium—H2804solution，thebestconcentrationofvanadiumionsis

7、aboutl-5～2M。『：1Itj艺采纯工大学硬±学位论文曩⋯。。i⋯jjijj

8、i誊。io藕lieacid,ja—m“moniumox—alate：遴}礅，glucose,D．fructose，≤lactoseareexploredasadditivesinnegativeelectrolyteforvanadiumbattery,respectively．Theeffectsofadditiveson,electrolytearestudiedforthethermalStabilityOf协eV(III)sulfuricacidsolution

9、andbycyclicvoltammetry,el⋯ectrochemicalimpedanc