magistrsko delo
Blaž Jaklič (Author), Matjaž Spreitzer (Mentor), Aleš Podgornik (Thesis defence commission member), Robert Dominko (Thesis defence commission member), Marjan Marinšek (Co-mentor)

Abstract

Litij-ionski akumulatorji so zaradi vse večje potrebe po shranjevanju energije pridobili na pomenu, saj omogočajo visoko napetost delovanja, daljšo življenjsko dobo in večjo specifično kapaciteto, v primerjavi z drugimi komercialnimi akumulatorji. Največji problem litij-ionskih akumulatorjev predstavlja degradacija katodnih materialov, zato je razvoj le-teh ključnega pomena. Obetavni katodni material predstavljajo nekatere spojine z litijem, manganom in kisikom; med njimi ima največji potencial spinelna struktura LiMn2O4, saj deluje pri visokih napetostih. Poleg LiMn2O4, bi za katode potencialno uporabili tudi Li4Mn5O12 in Li2MnO3 s plastovito strukturo. Z reakcijo v trdnem smo sintetizirali vzorce z nominalno sestavo Li2MnO3, LiMn2O4, Li3,2MnO3 in Li1,6Mn2O4. Iz sintetiziranih keramičnih prahov smo pripravili pozitivne elektrode in jih uporabili v akumulatorskih celicah. S pomočjo meritev galvanostatskega ciklanja smo določili odvisnost specifične kapacitete od števila ciklov polnjenja in praznjenja celice. Poleg elektrokemijskih meritev, smo s pomočjo rentgenske difrakcije in vrstične elektronske mikroskopije primerjali prahove, sintrane pri različnih temperaturah. Iz sintranih prahov smo želeli pripraviti tarče za sintezo tankih plasti s tehniko pulznega laserskega nanašanja.

Keywords

litij;mangan;katoda;katodni materiali;keramični materiali;sinteza;akumulatorji;magistrska dela;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL FKKT - Faculty of Chemistry and Chemical Technology
Publisher: [B. Jaklič]
UDC: 621.355(043.2)
COBISS: 82685699 Link will open in a new window
Views: 296
Downloads: 22
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Other data

Secondary language: English
Secondary title: Synthesis and characterization of Li-Mn oxides for cathode materials in lithium-ion batteries
Secondary abstract: Lithium-ion batteries have gained importance due to the growing need for energy storage, as they provide high operating voltage, greater specific capacity and have a longer lifespan compared to other commercial batteries. The biggest challenge of lithium-ion batteries is the degradation of cathode materials, so the development of these is crucial. Promising cathode materials for batteries, containing only manganese as transition metal, are lithium-manganese oxides; the spinel structure LiMn2O4 shows the greatest potential, as it operates at high voltages. In addition to LiMn2O4, the Li4Mn5O12 and Li2MnO3 with layered structure could potentially be used for the cathodes. Samples with a nominal composition of Li2MnO3, LiMn2O4, Li3,2MnO3 and Li1,6Mn2O4 were prepared via solid-state reaction. Positive electrodes, prepared from synthesized ceramic powders were used in battery cells. We determined the charge-discharge characteristics of the cells with galvanostatic cycling. In addition, we used XRD and SEM to analyze powders, sintered at different temperatures, as we wanted to prepare targets for thin film synthesis with pulsed laser deposition technique.
Secondary keywords: lithium;manganese;cathode;battery;synthesis;
Type (COBISS): Master's thesis/paper
Study programme: 1000376
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Fak. za kemijo in kemijsko tehnologijo
Pages: 50 str.
ID: 13345773