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Morfological and electrochemical properties of LiFePO4 powders synthesized in presence of different carboxylic acids

dc.contributor.editorStojković Simatović, Ivana
dc.contributor.editorJugović, Dragana
dc.contributor.editorCvjetićanin, Nikola
dc.contributor.editorVujković, Milica
dc.creatorKuzmanović, Maja
dc.date.accessioned2018-01-30T10:09:14Z
dc.date.available2018-01-30T10:09:14Z
dc.date.issued2017
dc.identifier.urihttp://dais.sanu.ac.rs/123456789/15988
dc.identifier.urihttp://eteze.bg.ac.rs/application/showtheses?thesesId=5007
dc.identifier.urihttp://nardus.mpn.gov.rs/123456789/8260
dc.description.abstractPredmet istraživanja ove doktorske disertacije je ispitivanje mogućnosti dobijanja prahova litijum gvožđe(II) fosfata (LiFePO4) novim i modifikovanim načinima sinteze. Zahvaljujući svojoj sposobnosti da reverzibilno interkalira/deinterkalira jone litijuma ovaj materijal se koristi kao katoda u litijum jonskim baterijama. Osnovni cilj ovih istraživanja je bio da se dobije čist materijal bez prisustva nečistoća, koji će imati pogodne fizičkohemijske karakteristike za elektrohemijsku primenu. Parametri kristalne građe mogu značajno uticati na elektrohemijske osobine, tako da je cilj istraživanja bio da se ovaj uticaj razjasni i da se sintetišu materijali koji bi u ovom smislu imali najoptimalniju morfologiju i ostale mikrostrukturne osobine. Polazeći iz vodenih rastvora, koji su se sastojali od jona litijuma, gvožđa i fosfora pomešanih u odnosu koji zadovoljava stehiometriju LiFePO4 i odgovarajuće karboksilne kiseline, dobijene su prekursorske smeše mikroemulzionom metodom, koprecipitacijom i liofilizacijom koje su dalje termički tretirane. Prekursorska smeša dobijena mikroemulzionom metodom je solvotermalno tretirana na temperaturi od 180 oC, dok su prekursorske smeše dobijene koprecipitacijom i liofilizacijom termički tretirane na visokim temperaturama (600-800 oC) u cilju dobijanja kristalnog praha LiFePO4. Korišćenjem eksperimentalnih tehnika rendgenske difrakcije na prahu, skenirajuće elektronske mikroskopije, Mesbauerove spektroskopije, rasejanja laserske svetlosti, termičke analize i elektrohemijske analize ispitan je uticaj različitih karboksilnih kiselina kao redukcionog sredstva i izvora ugljenika na morfološke i elektrohemijske karakteristike sintetisanih prahova.srp
dc.description.abstractThe subject of this PhD thesis is investigation of possibility to synthesize lithium iron (II) phosphate (LiFePO4) powders with new and modified synthesis procedures. Due to its ability to reversibly intercalate/deintercalate lithium ions, this material is used as a cathode in lithium ion batteries. The main objective of this research was to synthesize pure material without any phase impurities, which would have appropriate physical chemical properties for electrochemical applications. Crystal lattice parameters can significantly influence electrochemical properties, and this thesis aim is to clarify this relation and to synthesize materials with optimal morphology and other microstructural properties. Starting from mixed aqueous solution of lithium, phosphorus and iron ions in stoichiometric ratio and different carboxylic acids, precursors mixtures were prepared by microemulsion, coprecipitation and lyophilisation techniques, and afterwards were thermally treated. To prepare crystal LiFePO4 powders, microemulsion-derived precursor mixture was solvothermally treated at 180 oC, while precursor mixtures obtained by coprecipitation and lyophilisation were thermally treated at high temperatures (600-800 oC). X-ray powder diffraction, scanning electron microscopy, Mossbauer spectroscopy, laser light scattering, and thermal and electrochemical analyses were used to investigate the influence of different carboxylic acids as reducing agents and carbon sources on morphological and electrochemical properties of synthesized powderseng
dc.format(2017) -
dc.formatapplication/pdf
dc.languagesr
dc.publisherBelgrade Univerzitet u Beogradu, Fakultet za fizičku hemiju
dc.relationinfo:eu-repo/grantAgreement/MESTD/Integrated and Interdisciplinary Research (IIR or III)/45004/RS//
dc.rightsopenAccess
dc.titleMorfološke i elektrohemijske karakteristike prahova LiFePO4 sintetisanih u prisustvu različitih karboksilnih kiselinasrp
dc.titleMorfological and electrochemical properties of LiFePO4 powders synthesized in presence of different carboxylic acidseng
dc.typedoctoralThesis
dc.rights.licenseBY-NC-ND
dcterms.abstractКузмановић, Маја; Морфолошке и електрохемијске карактеристике прахова ЛиФеПО4 синтетисаних у присуству различитих карбоксилних киселина;
dc.type.versionpublishedVersion
dc.identifier.fulltexthttp://dais.sanu.ac.rs/bitstream/id/20085/1955.pdf


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