magistrsko delo
Jan Žuntar (Author), Miran Gaberšček (Mentor), Aleš Podgornik (Thesis defence commission member), Marjan Marinšek (Thesis defence commission member)

Abstract

Elektrokemijska impedančna spektroskopija velja kot ena izmed najbolj natančnih analitskih tehnik za proučevanje litij-ionskih akumulatorjev. Največjo težavo pri uporabi impedance predstavlja pravilna analiza pridobljenih rezultatov, saj prekrivanje posameznih impedančnih prispevkov pogosto otežuje njihovo interpretacijo. Boljšo ločitev prispevkov je mogoče doseči s spreminjanjem znanih spremenljivk v akumulatorju, npr. koncentracije elektrolita. Magistrsko delo proučuje vpliv uporabe elektrolitov z različnimi koncentracijami LiPF6 na impedančni odziv najuspešnejšega komercializiranega litij-ionskega katodnega materiala, NMC 811. Znižanje koncentracije elektrolita je povzročilo povečanje posameznih impedančnih prispevkov, kar je omogočilo določitev vseh relevantnih elektrokemijskih parametrov za proučevan sistem. Pridobljeni parametri so nato omogočili evalvacijo predlaganega TLM-a, ki je za proučevane elektrokemijske celice ustrezno opisal vse impedančne prispevke.

Keywords

litij-ionski akumulatorji;anoda;katoda;katodni materiali;material NMC 811;elektrokemijska impedančna spektroskopija;lestvičasti model;magistrska dela;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL FKKT - Faculty of Chemistry and Chemical Technology
Publisher: [J. Žuntar]
UDC: 621.355(043.2)
COBISS: 84720387 Link will open in a new window
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Downloads: 43
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Other data

Secondary language: English
Secondary title: Impedance spectroscopy of NMC 811 cathode materials
Secondary abstract: Electrochemical impedance spectroscopy is known to be one of the most accurate analytical techniques for the study of lithium-ion batteries. However, correct analysis of impedance data presents a rather difficult task due to the common overlap of several impedance features. Improved deconvolution can be achieved by variating certain battery parameters, such as electrolyte concentration. In the following thesis, the effects of varying LiPF6 salt concentration on the impedance response of the state-of-the-art lithium ion cathode material NMC 811 are examined. The increase in size of certain impedance features with decreasing salt concentrations enabled full decoupling of the impedance response, which provided access to all relevant battery parameters. These parameters then enabled the evaluation of a proposed TLM, which for the studied cells accurately described all relevant impedance features.
Secondary keywords: lithium-ion battery;electrochemical impedance spectroscopy;transmission line model;
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: IX f., 46 str.
ID: 13394696