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1、分类号密级UDC昆明理工大学博士学位论文废旧钴酸锂材料中钴回收及机理研究研究生姓名孟奇指导教师姓名、职称张英杰教授学科专业冶金物理化学研究方向废旧锂离子电池回收利用论文工作起止日期2016年3月~2018年3月论文提交日期2018年3月昆明理工大学博士学位论文AbstractLithiumionbatteries(LIBs)arewidelyusedinthefieldsofconsumption,power,energystorage,etc.becauseoftheirexcellentperformance.Largequantities
2、ofspentLIBsarediscardedafterlimitedservicelifetime.ThesespentLIBscannotbedisposedintolandfillbecauseitcontainshazardousmaterials,suchasorganicsolvents,heavymetals.While,valuablemetalsinspentLIBshavebeenidentifiedasattractivesecondarysource.Hence,recyclingofspentLIBshasbecome
3、animportantissueforresearchandapplication.ThehydrometallurgyhasbecomethemainmethodforrecyclingofspentLIBs,whichiscomposedofacidandreductantofhydrogenperoxide.However,reductantofH2O2cannotbeusedbecauseofitsstrongcorrosiveness,acidicdecompositionandpoorstability.Thedevelopment
4、ofgreenandmildreductantisthekeyforgreenandefficientleachingofspentLIBs.Basedonthermodynamicsandkineticstheory,spentLiCoO2materialisrecoveredbygreenrecyclingprocess,whichincludingleachingenhancedbyreduction,precipitationofcobaltwithoxalate,preparationofCo3O4byoxidationandrege
5、nerationofLiCoO2.Thecontrolstepsandreactionmechanismofleachingenhancedbygreenreductantsofglucoseandgrapeseedandelectrochemicalreductionarestudied,whichisconducivetotheefficientrecoveryofspentLIBs.TheleachingofspentLiCoO2materialiscloselyrelatedtoitsthermodynamicequilibrium.T
6、hepotentialE-pHdiagramofCo-H2Osystemisplottedunderdifferentionicconcentrations.BasedontherelativepotentialandpossibleleachingprocessofLiCoO2+2+2andCo,LiCoO2materialismoreeasilytransformedintoCoatlowpotentialvalues.ReductionisbeneficialforleachingofLiCoO2.Insteadofcommonlyuse
7、dchemicalreductantofhydrogenperoxide,theleachingprocessofspentLiCoO2materialsisstudiedbyusingglucoseasgreenandmildreductant.Thereductionreactionofglucosemainlyincludesoxidationofaldehydegroupandoxidationofcarboxylgroupduringleachingprocess.Theintermediateproductofthereaction
8、issingleorganicacid,whichcanincreasetheacidconcentrationoftheleachingsystem
