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1、正極自支撐的聚合物電解質的制備正極自支撐的聚合物電解質的制備正極自支撐的聚合物電解質的制備正極自支撐的聚合物電解質的制備正極自支撐的聚合物電解質的制備正極自支撐的聚合物電解質的制備正極自支撐的聚合物電解質的制備正極自支撐的聚合物電解質的制備正極自支撐的聚合物電解質的制備正極自支撐的聚合物電解質的制備正極自支撐的聚合物電解質的制備正極自支撐的聚合物電解質的制備正極自支撐的聚合物電解質的制備正極自支撐的聚合物電解質的制備第38卷第2期2007年4月中南大學(自然科學版)J.Cent.SouthUniv.(Science
2、andTechnology),,ol-38No.2Apr.2007正極自支撐的聚合物電解質的制備胡擁軍一,陳白珍,袁艷,徐微,石西昌(1.中南大學冶金科學與工程學院,湖南長沙,410083;2.湖南城市學院化學與環(huán)境工程系,湖南益陽,413049)摘要:以N,N一二甲基甲酰胺為溶劑,聚偏氟乙烯一六氟丙烯為聚合物基質,采用直接揮發(fā)溶劑法制備正極自支撐的聚合物電解質,并以鋰為負極制備LiCoO2聚合物電池.用掃描電子顯微鏡和循環(huán)伏安實驗對聚合物電解質進行表征,用紅外光譜分析了電解質微孔的形成機理,并對聚合物電池的充放電
3、性能和界面阻抗進行測試.結果表明:直接揮發(fā)溶劑制得的聚合物電解質孔穴豐富,電化學穩(wěn)定窗口達5.5v采用正極自支撐電解質可改善材料的力學性能,降低電池的界面阻抗;制備的聚合物電池界面性質穩(wěn)定,循環(huán)40次后容量保持率為97.5%,0.5C和lC倍率放電分別能保持0.1C放電容量的97.8%和95.7%.關鍵詞:聚合物電解質;鋰離子電池;交流阻抗;界面行為;聚偏氟乙烯一六氟丙烯中圖分類號:TM912文獻標識碼:A文章編號:1672.7207(2007)02—0256—06Preparationofpolymetelect
4、rolytesupportedbycathodeelectrodeHUYong-jun一,CHENBai—zhen,YUANYan,XUHui,SHIXi—chang(1.SchoolofMetallurgicalScienceandEngineering,CentralSouthUniversity,Changsha410083,China;2.DepartmentofChemistry,HunanCityUniversity,Yiyang413049,China)Abstract:Apoly(vinyliden
5、e)fluoride?hexafluoropropyleneelectrolytesupportedbythecathodeelectrodewaspreparedbyevaporatingthesolventofdimethylformamide,andpolymerlithium—ionbaRerieswereassembledbyusinglithiumfoilasanodeandLiCo02ascathodemateria1.PolymermembraneWascharacterizedbyscanning
6、electronmicroscopyandcyclicvoltammetrytest,theformationmechanismofmicroporewasdiscussedbyinfraredspectroscopy,andthepolymerbaRery’Selectrochemicalpropertiesandresistanceweretestedbycharge—dischargeexperimentandA.C.impedance.Theresultsshowthatthispolymermembran
7、ehasrichmicroporeanditselectrochemicalstabilitywindowreaches5.5VThepolymerelectrolytesupportedbycathodeelectrodehasexcellentmechanicalpropertyandCanreducetheinterfacialimpedanceofpolymerbaRery.PolymerlithiumbaRerykeepsastableinterfacialproperty,anditscapacityr
8、etentionis97.5%after40cycles.Thedischargecapacitiesof0.5Cand1Care97.8%and95.7%ofthedischargecapacityof0.1Crespectively.Keywords:polymerelectrolyte;lithiumbaRery;A.C.impedance;inter
