微波共沉淀法制備lini,0.8co,0.2o,2及電化學(xué)性能研究

1、上海交通大學(xué)碩士學(xué)位論文微波共沉淀法制備LiNiCoO及電化學(xué)性能研究姓名：王亮申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：化學(xué)工程指導(dǎo)教師：馬紫峰20070101上海交通大學(xué)碩士生畢業(yè)論文PREPARATIONELECTROCHEMICALPROPERTIESOFLiNi0.8Co0.2O2BYMICROWAVECOPRECIPITATIONMETHODABSTRACTAnovelmicrowavecoprecipitationmethodwasused

2、tosynthesizeLiNi0.8Co0.2O2cathodematerialsflithiumionbatteries.TheLiNi0.8Co0.2O2powderswereobtainedbysinteringthemixtureofLiOHH2ONi0.8Co0.2(OH)2precurspreparedbyureaprecipitationinnickelnitratecobaltnitratesolution.TheCo

3、2Ni2coprecipitationinaqueoussolutionusingureaasprecipitatwascarriedoutbymicrowaveheatingtoallowthedecompositionofurea.ThepreparedNi0.8Co0.2(OH)2hasthesimilarstructurewithαNi(OH)2whichisknownashydratednickelhydroxidewitha

4、nbiginterlayerseparation（7.231）.TheXRDpatternsofthefinalLiNi0.8Co0.2O2productcouldbeindexedbyahexagonalα–NaFeO2structure(spacegroup:1663Rm?)noobviousimpurityphasepeakscouldbeobservedindicatingthatthesynthesizedsampleswer

5、esinglephase.ThesampleLiNi0.8Co0.2O2hasexcellentelectrochemicalpropertieswhichhasaninitialdisgecapacityof187.8mAhgwithgingdisgingcurrentof16mAgvoltagewindowof3.04.3Vat25℃.After40cyclesthedisgecapacityremains161.8mAhgshow

6、inggoodcyclingstability.HowevertherateperfmanceofthepreparedLiNi0.8Co0.2O2sampleswasnotsatisfying.Itisnecessarytodopethematerialtoimprovethehighrateperfmance.Indertoimprovethehighrateperfmancealuminummanganesewerechosent