Primerjava različnih sistemov za merjenje elektrokemijske impedančne spektroskopije baterij

Mušič, Marcel (author), Katrašnik, Tomaž (mentor)

V diplomski nalogi je izvedena primerjava različnih sistemov za merjenje elektrokemijske impedančne spektroskopije (EIS) pri karakterizaciji litij-ionskih baterij. Primerjani so laboratorijski merilni sistemi in cenovno dostopnejši sistemi. Meritve so bile izvedene pri različnih stanjih napolnjenosti baterije, rezultati pa predstavljeni in analizirani z uporabo Nyquistovih in Bodejevih diagramov. Pri tem so ovrednotene natančnost, stabilnost in primerljivost rezultatov posameznih merilnih sistemov ter njihove omejitve pri karakterizaciji baterijskih celic. Na podlagi primerjave je ocenjena primernost cenovno dostopnejših EIS-sistemov za širšo uporabo pri karakterizaciji litij-ionskih baterij. Posebna pozornost je namenjena tudi vplivu spreminjanja polnosti baterije na rezultate EIS-meritev.

• Language: Slovenian
• Keywords: litij-ionske baterije, elektrokemijska impedančna spektroskopija, merilni sistemi, Nyquistov diagram, Bodejev diagram, karakterizacija baterij
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [M. Mušič]
• Year: 2026
• Number of pages: XIII, 39 f.
• PID: 20.500.12556/RUL-186793
• UDC: 621.355:537.8(043.2)
• COBISS.SI-ID: 290189571
• Publication date in RUL: 05.09.2026

Secondary language

• Language: English
• Title: Comparison of different systems for measuring electrochemical impedance spectroscopy of batteries

Abstract

The thesis presents a comparison of different systems for measuring electrochemical impedance spectroscopy (EIS) for the characterization of lithium-ion batteries. Laboratory measurement systems and more cost-effective systems are compared. Measurements were performed at different states of charge of the battery, and the results were presented and analyzed using Nyquist and Bode plots. The accuracy, stability, and comparability of the results obtained with individual measurement systems, as well as their limitations in the characterization of battery cells, were evaluated. Based on the comparison, the suitability of more cost-effective EIS systems for wider use in the characterization of lithium-ion batteries was assessed. Particular attention was also paid to the influence of changes in the battery's state of charge on the EIS measurement results.

• Keywords: lithium-ion batteries, electrochemical impedance spectroscopy, measurement systems, Nyquist plot, Bode plot, battery characterization