New Network Polymer Electrolytes Based on Ionic Liquid and SiO 2 Nanoparticles for Energy Storage Systems

• Published in: Membranes (Basel) Vol. 13; no. 6
• Main Authors: Khatmullina, Kyunsylu G, Slesarenko, Nikita A, Chernyak, Alexander V, Baymuratova, Guzaliya R, Yudina, Alena V, Berezin, Mikhail P, Tulibaeva, Galiya Z, Slesarenko, Anna A, Shestakov, Alexander F, Yarmolenko, Olga V
• Format: Journal Article
• Language: English
• Published: Switzerland 24.05.2023
• Subjects: ionic conductivity; self-diffusion coefficients; NMR with PFG; solid-state lithium battery; SiO2 nanoparticles; solvate shell; quantum-chemical modeling; nanocomposite polymer gel electrolytes
• ISSN: 2077-0375; 2077-0375

Elementary processes of electro mass transfer in the nanocomposite polymer electrolyte system by pulse field gradient, spin echo NMR spectroscopy and the high-resolution NMR method together with electrochemical impedance spectroscopy are examined. The new nanocomposite polymer gel electrolytes consisted of polyethylene glycol diacrylate (PEGDA), salt LiBF and 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIBF ) and SiO nanoparticles. Kinetics of the PEGDA matrix formation was studied by isothermal calorimetry. The flexible polymer-ionic liquid films were studied by IRFT spectroscopy, differential scanning calorimetry and temperature gravimetric analysis. The total conductivity in these systems was about 10 S cm (-40 °C), 10 S cm (25 °C) and 10 S cm (100 °C). The method of quantum-chemical modeling of the interaction of SiO nanoparticles with ions showed the advantage of the mixed adsorption process, in which a negatively charged surface layer is formed from Li BF ions on silicon dioxide particles and then from ions of the ionic liquid EMI BF . These electrolytes are promising for use both in lithium power sources and in supercapacitors. The paper shows preliminary tests of a lithium cell with an organic electrode based on a pentaazapentacene derivative for 110 charge-discharge cycles.