magistrsko delo
Leja Zaletel (Author), Robert Dominko (Mentor), Marjan Marinšek (Thesis defence commission member), Miran Gaberšček (Thesis defence commission member)

Abstract

NMC katodni materiali z visoko vsebnostjo niklja predstavljajo spojine, s katerimi lahko povečamo količine shranjene energije v litij ionskih akumulatorjih. Največji izziv pri takih materialih predstavlja spreminjanje strukture materiala in s tem povezan upad specifične kapacitete med zaporednim polnjenjem in praznjenjem akumulatorjev. S tem magistrskim delom smo želeli prikazati pozitiven vpliv polimernih prevlek na ohranjanje strukture materiala in stabilno delovanje akumulatorjev. Uporabljali smo elektronsko prevoden polimer PEDOT:PSS in ionsko prevoden polimer PAA. Iz rezultatov elektrokemije in vrstične elektronske mikroskopije sklepamo, da je optimalen delež dodanih polimerov 3 ut. %. Ugotovili smo tudi, da s povečanjem ionsko prevodne komponente dosežemo višje začetne kapacitete sistema, kot tudi boljšo stabilnost delovanja akumulatorja. Optimalno razmerje med PEDOT:PSS in PAA smo določili med 25/75 in 15/85. Z termogravimetrično analizo in infrardečo spektroskopijo smo potrdili, da nastale prevleke res vsebujejo oba polimera PEDOT:PSS in PAA v dodanih razmerjih.

Keywords

litij-ionski akumulatorji;katodni materiali;NMC811;polimerne prevleke;PEDOT:PSS;PAA;magistrska dela;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL FKKT - Faculty of Chemistry and Chemical Technology
Publisher: [L. Zaletel]
UDC: 621.355:678(043.2)
COBISS: 88623107 Link will open in a new window
Views: 270
Downloads: 60
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Other data

Secondary language: English
Secondary title: Polymer coatings applied on the NMC cathode material
Secondary abstract: NMC materials, with high Ni content, represent promising cathode materials for Li-ion batteries which demonstrate higher specific capacities in comparison to traditional cathode materials. The challenge of using such materials is related to the structural changes and the associated specific capacity fading during the electrochemical cycling of batteries. With this master’s thesis, we have shown the positive influence of the polymer coating on the stability of the material structure and the electrochemical performance of such batteries. Two different types of polymers have been used for coatings on the secondary particles of NMC, an electron conductive polymer PEDOT:PSS and an ion conductive polymer PAA. The results of electrochemical cycling and scanning electron microscopy (SEM) show that the optimal percentage of added polymers is 3 wt. %. We show that by increasing the ion-conducting component, we achieve higher initial specific capacities as well as better cycling stability. The determined optional ratio between PEDOT:PSS and PAA are between 25/75 and 15/85. Using thermogravimetric analysis and infrared spectroscopy we confirmed that the synthesized coatings contain both polymers PEDOT:PSS and PAA and coating percentages are equal to percentages of added polymers.
Secondary keywords: lithium-ion batteries;polymer coatings;NMC811;PEDOT:PSS;PAA;
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, smer Kemijsko inženirstvo
Pages: 54 str.
ID: 13723045