锂离子电池正极材料li3v2(po4)3的制备及其性能研究

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1、山东大学硕士学位论文AbstractWiththedevelopmentofeconomyandsociety,peoplecommittedtodevelopingnew,renewableandcleanenergybecauseoffossilfuels，energyandenvironmentalcrisis．Thedemandforlithiumionbatteriesisbecomingmoreandmoreurgentinelectriccars，intelligentstoragegridando

2、therhigh—powerapplicationswithitsadvantagesofnopollutionandgoodstability．ThemonoclinicLi3V2(P04)3willbethefuturehighpowerlithiumionbatterycathodematerialsofhighcapacityofmajorcandidatematerialsbecauseofitsgoodperformanceofdeintercalation，lowprice，simpleprepar

3、ation，environmentfriendlyandhightheoreticalcapacity．However,itsmaterialconductivityislowduetotheV06eightsurfaceinthestructureofLi3V2(P04)3beingseparatedbyP04tetrahedra，whichlimeditslarge—scaleapplication．Inthispaper,weimprovetheelectrochemicalperformanceofLi3

4、V2(P04)3bycoating，dopingandothermodifiedresearch．Theresultsshowthat：Whentheglucoseconcentrationwas10wt％，theelectrochemicalperformanceofLi3V2(P04)3sinteringat800。C，8hthroughsol—gelmethodWasoptimal，andthemonoclinicstructureremainsunchangedaftercycle．Duringthesy

5、nthesisprocess，duetotheadditionofsurfaceactiveagentdiethyleneglycolandosteoporosisagentNH4N03，Li3V2(P04)3showedspherical，andtheadhesiondegreeoftheLi3V2(P04)3ballsalsosignificantlyreduced．Theparticlesizebecamesmallergraduallywiththeadditionofglucose．Whentheglu

6、coseconcentrationWas10wt％，Li3V2(P04)3ballabout400nm-1Ixmuniformlydispersedintheremainingcarbonlayer,andexhibitedthebestelectrochemicalperformance，thedischargecapacitywere131．8mAhg～，126．5mAhF1，102．4mAh旷1and82．8mAh旷1at0．1C，1C，10Cand20C．Thelithj啪iondiffusioncoef

7、ficientDLi+is3．37x10。9cm2s～throughcalculation，whichismuchhigherthanothermaterials．WhenwemodifiedLi3V2(P04)3throughCe02coatingandfoundthatCehasnotIII山东大学硕士学位论文enteredtheLi3V2(P04)3lattice，butexistedonthesurfaceofLi3V2(P04)3particlesintheformofCe02．Theelectroch

8、emicalperformanceofLi3V2(P04)3wassignificantlyimprovedduetothereductionoftheparticlesizeandconductivityincreasewhenCe02wasimported．Comparedwiththeunmodifiedpurephase，Ce02coatedsamplesofLi