鋰離子電池低溫性能研究.pdf

1、哈爾濱工程大學碩士學位論文鋰離子電池低溫性能研究姓名：付慶茂申請學位級別：碩士專業(yè)：應用化學指導教師：陳猛20050201哈爾演工程大學碩士學位論義AbstractBothnegativeandpositiveelectrodesinlithiumionbaRerieshavetheirownmostcompatibleelectrolyteHoweveritisimpossibleforUStousetwodifferentkinds

2、ofelectrolytesintheSalTlebatterysystemTherefore，theselectedelectrolytemusthaveconunoncompatibilitywithbothpositiveandnegmiveelectrodematerialsWeselectedmaterialAfromdifferentcathodematerialsLiC002asresearchedelectrodemat

3、erialInviewofpoorelectrolyteconductivityatlOWtemperature，weimproveperformanceofnormalelectrolytebymulticosolventsOfthecompatibilityofcathode／anodeelectrodematerialswith4kindsofelectrolytesinvestigated，anodeMCMBhastheexce

4、llentcommoncompatibilitywiththeelectrolyteofEC：DECwhichhasthehighestmeltingECconstituteofthe4kindsofelectrolytesSolutionscontainingahighpercentageofECconducetofavorableSEIfilmformationWhilecathodeLiC002hastheexcellentcom

5、moncompatibilitywiththeelectrolyteofEC：DEC：DMC：XandEC：DEC：DMC：YWitlloweringofthetemperaturecapacityofMCMBLiC002celldecreasesandelectricpolarizationincreasesOnemayfindthattheprimarycauseofthepoorLiioncellperformanceatlowt

6、emperatureisrelatedtoLiiondiffusioninthecarbonanodeandnotintheelectrolyteand／orSEIfilm1ithiationintodelithiatedgraphiteismoredifficultthandelithiationoutoflithiatedgraphiteatlowtemperatureswhichresultsindecreaseofcapacit

7、y111ehigherpolarizationvoltagemaybeascribedtothedecreaseinionicconductivityoftheelectrolyte，theslownessofLiiondiffusionintheMCMBanodeandtllenewSEIduetodepositionofmetalliclithiumduringlowtemperaturechargingWefoundbytheth

8、reeelectrodeexperimentalcell，depositionofmetalliclithiumduringlowtemperaturechargingisrelatedtoelectrolyte，chargingrate，catoffvoltageandSOonKeyWord：lithium—ionbaRerycompatibilitythree—electrodeexperimentalcell，low—temper