鋰離子電池正極材料在水溶液中的電化學行為研究.pdf

1、分類號UDC學校代碼學號10497104972071503劣膊淤筍大穿學位論文目鏗離子電池正極材料在水溶液中的電化學行為研究StudyonelectrochemiealProPertiesofeathodematerials文目題英題研究生姓名巍嘉姓名肖亮職稱副教授指導教師單位名稱理學院郵編430070申請學位級別碩士學科專業(yè)名稱無機化學論文提交日期20n年4月論文答辯日期20n年5月學位授予單位武漢理工大學學位授予日期答辯委員會主席居

2、我評閱人盡億字2011年5月AbstractAqueouslithiumionbatterieshavetheadvantagesofnonaqueouslithiumionbatteryandtraditionalseeondarybatterieswithaqueouseleetrolyte，whiehwilleliminatebuming，exPlosiveerisisresultedftomorganieeleetrolyte.

3、ComParedwithotherlowvoltagebatteries，ithaseomPetitivePotential.LIFePO4andLIMnZO4eathodematerialsforlithiumionbatterieswithstrueturalstability，highsPeeifieeaPaeity，heatsafety，lowcostofrawmaterials，areeonsideredthemostrese

4、arehvalueofthematerialsystem，andwillnotbelimitedbyaqueouselectrochemiealwindows.ThechargeanddisehargeexPerimentsofLIFePO4withPowdermieroeleetrodeinLINO3showthatLIFePO4hassimilareaPaeityinaqueoussolutionandorganieelectrol

5、yte.Theeyelievoltammetrystudiesshowthat:(1)lithiumionofLIFePO415reversibledeinterealationinLINO3solution:(2)inereasingtheeoneentrationofLINO:eanaeeeleratelithiumiondeintercalationrate.(3)thelithiumiondiffusioneoeffieient

6、sinthesolidPhaseincreasesignifieantlytemPeratureinereases.ByPotentiostaticintermittenttitrationmeasuredlithium一iondiffusioneoefficientsofLIFePO4inLINO3solution，theresultsshowthat:(1)thediffusioncoeffieientsofsixdifferent

7、Partiele一sizesamPlesaremeasuredwiththeeleetrodepowdermo印hology，valuesareallin10一‘4emZs一‘magnitude:(2)thedifrusioneoeffieientsdeereasewiththeinereaseofPotentials(3)atthePlatfmofeurrenteharge一disehargePotential，diffusioneo

8、effieientincrease，weexPlainthisPhenomenonviathenucleation一growthmeehanismofphaseChangeProeess:(4)aPParentdiffusioneoeffieientobtainedinPotentialzone15notelearforthePhysiealmeaning.Phasetransitionoecursinthesingle一Phasere

9、gionbeforeandaftertheaetualvalueofthediffosioncoeffieientobtainedintheran邵10一‘4emZs一‘:(5)ByusingPotentiostatieintermittenttitrationtoobtaindiffusioneoefficientswithearbonfiberelectrodeeontaetingsingleParticleofLIFePO4inL