Priprava in karakterizacija zamreženih trdnih elektrolitov na osnovi PEO in LiTFSI z dodatkom fotoiniciatorjev za litij-ionske akumulatorje.

Adam, Žan (author), Dominko, Robert (mentor), Genorio, Boštjan (comentor)

V magistrskem delu smo raziskali pripravo in karakterizacijo zamreženih trdnih polimernih elektrolitov na osnovi etilen oksida (PEO) in litijevega bis(trifluorometansulfonil)imida (LiTFSI) z uporabo različnih fotoiniciatorjev. Namen raziskave je bil ugotoviti vpliv fotoiniciatorjev na stopnjo zamreženja ter elektrokemijske lastnosti pripravljenih elektrolitov. Pripravljene elektrolite smo ovrednotili z UV-VIS, ATR-FTIR in ramansko spektroskopijo ter z določanjem stopnje zamreženja, meritvami ionske prevodnosti, elektrokemijske stabilnosti, kritične tokovne gostote in elektrokemijskim testiranjem pri konstantnem toku v določenem potencialnem oknu. Rezultati so pokazali, da fotoiniciatorji tipa II omogočajo uspešno zamreženje PEO, medtem ko fotoiniciatorja tipa I v preučevanih pogojih nista bila učinkovita. Med preučevanimi sistemi je elektrolit z dodatkom 4,4′-difluorobenzofenona izkazal najboljše ravnovesje med stopnjo zamreženja, ionsko prevodnostjo in elektrokemijsko stabilnostjo. Rezultati potrjujejo, da je fotokemijsko zamreženje učinkovita strategija za izboljšanje lastnosti trdnih polimernih elektrolitov ter predstavlja obetaven pristop k razvoju varnejših litij-ionskih akumulatorjev.

• Language: Slovenian
• Keywords: trdni polimerni elektroliti, Li-ion akumulatorji, zamreženje
• Work type: Master's thesis/paper
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Year: 2026
• PID: 20.500.12556/RUL-186921
• Publication date in RUL: 07.09.2026

Secondary language

• Language: English
• Title: Preparation and Characterization of Photoinitiator-Assisted Cross-Linked Solid-State Electrolytes Based on PEO and LiTFSI for Lithium-Ion Batteries.

Abstract

This master's thesis focuses on the preparation and characterization of cross-linked solid polymer electrolytes based on polyethylene oxide (PEO) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) using different photoinitiators. The aim of this work was to evaluate the influence of photoinitiators on the degree of cross-linking and the electrochemical properties of the prepared electrolytes. The electrolytes were characterized by UV-Vis, ATR-FTIR, and Raman spectroscopy, as well as by gel fraction analysis, ionic conductivity measurements, electrochemical stability tests, critical current density measurements, and galvanostatic cycling. The results showed that Type II photoinitiators successfully induced cross-linking of the PEO matrix, whereas the Type I photoinitiators were ineffective under the applied conditions. Among all tested systems, the electrolyte containing 4,4′-difluorobenzophenone exhibited the best balance between the degree of cross-linking, ionic conductivity, and cycling stability. The results demonstrate that photochemical cross-linking is an effective strategy for improving the properties of solid polymer electrolytes and represents a promising approach toward the development of safer lithium-ion batteries.

• Keywords: solid polymer electrolytes, lithium-ion batteries, cross-linking