鋰離子電池過(guò)充保護(hù)添加劑的研究.pdf

1、天津大學(xué)碩士學(xué)位論文鋰離子電池過(guò)充保護(hù)添加劑的研究姓名：劉強(qiáng)申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：應(yīng)用化學(xué)指導(dǎo)教師：唐致遠(yuǎn)20061201ABSTRACTThesafetyconcernisthemostobsessingproblemaboutlithiumionbatteriesAmongallthesafetyconceru$，theoverchargesafetyisofthemostimportanceThispaperfocusesont

2、heoverchargeadditivestoimprovetheoverchargesafetyofthelithiumionbatteriesThispaperanalyzesthebehaviorofthelithiumionbatterieswithoutanyoverchargeprotectionandprovesthedangersthroughtheoverchargeThepossiblereactionsduring

3、overchargearealsodiscussedThroughthe1Coverchargetest，thebatteriesperformancetest，electrochemicalimpedancespectroscopy，theconductivityofelectrolyte，theselfextinguishtimetestandselfdischargetestthewritertestedtheeffectofcy

4、clohexylbenzene(CHB)astheoverchargeprotectionadditiveanditseffectonthebatte哆performanceAlso，thebehaviorofthebatterywithCHBasadditiveisdiscussedCHBcandecreasetheconductivityoftheelectrolyte，increasethecombustibilityandinc

5、reasestheselfdischargeThewriterconcludesthatthepropercontentofCHBaddedintothebatterywouldbestbebetween5％and7％Thispaperalsostudiestheeffectofseveralthiopheneramifications(2，5dichlorothiophene，2一bromothiopheneand3一methylth

6、iophene)ontheoverchargesafetyofthelithiumionbatteryTheresultsshowthatthe2bromothiophenecan’timprovemuchofthesafetybuthavingadverseinfluenceonthebatteryperformance；2，5一dichlorothiophenecanprotectthebatteryinsomedegreeasit

7、canconsumetheoverchargecurrentbutitcan’tstandthe1C10Vovercharge；3一methylthiophene’SoxidizationpotentialislowerthanthenormalworkingvoltageofthelithiumionandthusisnotsuitableforthelithiumionsystemFurther，thispaperstudiesth