層狀LiMnO-,2-的合成、摻雜及其電化學(xué)性能研究.pdf

1、曰新月縣論文題目：星叢!i!!!；塑盒盛!鱉雜星基電些芏!眭篋亞窒九公p／L’欲碩士學(xué)位論文MASTER’SDISSERTATION培養(yǎng)院系：絲主芏墮一級(jí)學(xué)科：些芏二級(jí)學(xué)科：盟整塑堡里些芏論文作者：在玉至指導(dǎo)教師：吐堂壹iⅡ越撞——南開大學(xué)研究生院2005年5月19日茅咖大一腳洲尚=iAbstractAbstractBailmilling—promotedsolidstatereactionandionexchangereactionw

2、ereusedtopreparedmonocliniclayeredLiMn02(m—LiMn02)XRD、SEM、TEM、XPS，XPS、FTIRandelectrochemicalwayswereadoptedtostudythepropertiesofitdeeplyandsystematicallyTheLiMn02wasdetectedasasinglephasewithala)，eredmonoclinicstructure

3、byXraydiffraction(xJu3)，ThewellresolvedinterferencefringespacingwasaboutO485ilmfromIIRTEM，whichwasconsistentwiththe(001)planeinmonoclinicLiMn02phaseTheabsorbingpeakofthestretchingandbendingvibrationsofMrr_ObondinmLiMn021

4、ledin57478cm—byFTIRMnelementinm—LiMn02was3andtheelectronicbondingenergyofMnelementwas64198eVbyXPSThestructureofmLiMn02withfinestructurelikelyconvertedtospinelstructureafterthefirstcycle，thefirstchargecapacitywas271mAhg一，

5、thefirstdischargecapacitywas1255mAh‘g一，theelectrochemistrycharge—dischargecapacitydecreasedduringelectrochemistrycyclingLiCuxMnlxOffx=005～O5)wasobtainedbythewaymentionedaboveThesedopedmaterialswerecharacterizedandtestedb

6、yⅪ①、SEMandelectrochemistrywaysTheresultsshowedtheCu”ionsinsertsintothecrystallatticesofmLiMn02，andthedopedmaterialshadbetterelectrochemistrycyclicperformancesthanm—LiMn02Howeverthedischargecapacitiesofthedopedmaterialsde

7、creasedwiththeincrementofthedopingCuelementComparingtom—LiMn02，wepreparedorthorhombicdistortionlayeredLiMn02(oLiMn02)bytraditionalhightemperaturesolidstatereactionandballmillingpromotedsolidstatereactionTheXRDresultsindi

8、catedthatweobtainedoLiMn02bytraditionalhightemperaturesolid—statereactioncalledonestephightemperaturesolidstatereaction，whichwasnotusedtoprepared112一LiMnQusuallyHoweverweobtainedamixedphasewitho—LiMn02andm—LiMnO；byballmi