Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 32: Poster Session II
CPP 32.1: Poster
Donnerstag, 20. März 2025, 09:30–12:00, P3
Influence of Salt Addition on the Ionic Conductivity, Hydration Behavior, and Structure of Poly(sulfobetaine) Hydrogels for Electrolyte Applications — •Friederike Ganster1, Marcell Wolf2, Gilles Wittmann2, Peter Müller-Buschbaum1, and Lucas P. Kreuzer2 — 1TUM School of Natural Sciences, Chair for Functional Materials, 85748 Garching, Germany — 2Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II), 85748 Garching, Germany
Polyzwitterionic hydrogels are promising candidates for electrolytes in aqueous solid-state batteries, such as zinc-ion batteries (ZIBs), due to their ability to retain water molecules that facilitate ionic transport. The retained water acts as a lubricant, coordinating with the charged groups of the polyzwitterion and reducing interactions with mobile Zn2+ ions, thereby promoting the dissociation of ions and improving ion mobility. We systematically investigate how the addition of cosmotropic ZnSO4 or rather chaotropic Zn(acetate) affects the ionic conductivity of poly(sulfobetaine)-based hydrogels. Our findings reveal that while ionic conductivity is generally increased, the extent and nature of this enhancement strongly depend on the specific salt type. We attribute this to unique and salt-type sensitive structural and hydration changes. X-ray scattering techniques resolve the electrolyte structure, and FTIR and Raman spectroscopy provide insights into the altered hydration behavior. Electrochemical impedance spectroscopy correlates these structural and hydration changes with variations in ionic conductivity and ion transport efficiency.
Keywords: polymer electrolyte; zwitterionic hydrogel; zinc batteries; poly(sulfobetaine)