Elektrospun, ion-conducting polymer membranes as solid electrolytes
Physical Chemistry of Solids and Surfaces, Material Characterisation
Final Report Abstract
As part of the project "Electrospun, ion-conductive polymer membranes as solid-state electrolytes," Li, Na, and Mg polymer electrolytes were investigated. Polyethylene oxide (PEO) and polyacrylo nitrile (PAN) were primarily used as the polymers. By varying preparation methods, conducting salt and plasticizer additive concentrations, and incorporating ceramic, non-conductive additives, the electrochemical properties and ion dynamics of all systems were extensively examined. This involved the development of methods in electrospinning and NMR spectroscopy to successfully fabricate and characterize the systems. Temperature dependent static 7Li and 19F NMR experiments were conducted to obtain information about cation and anion mobility in the systems, temperature dependent 13 C-MAS-NMR experiments (MAS, with 1H decoupling, as CPMAS) with the aim to study the segmental mobility of the PEO chains. PAN in these systems adopts the role of the matrix material, allowing to incorporate the PEO chains without any further participation in the Li transport. The targeted phase segregation being employed in the case of polymer blends to enhance conductivity. With conductivities ranging from 10⁻⁵ to 10⁻³ S cm⁻¹, efficient PEO/PAN polymer electrolytes were developed, which, through the use of PAN, are now usable above the PEO melting point. Their thermal operating window is therefore enlarged. The results about the dynamics in the polymer systems obtained from the solid state NMR experiments could be successfully correlated with conductivity data. For the purpose of comarison we also tested the synthesis of membranes via the hot-pressing route. Our results show that this approach allows for the synthesis of promising stable mixed polymer membranes, whose ionic conductivities almost reach those of the samples synthesized via electrospinning. This method offers the advantage of being more robust in terms of the controllability of the amount of plasticizer incorporated in the membranes.
Publications
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Effect of nanostructured Al2O3 on poly(ethylene oxide)-based solid polymer electrolytes. Zeitschrift Für Naturforschung B, 76(10–12), 615–624.
Walke, Patrick; Kirchberger, Anna; Reiter, Felix; Esken, Daniel & Nilges, Tom
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Fast Magnesium Conducting Electrospun Solid Polymer Electrolyte. Batteries & Supercaps, 5(12).
Walke, Patrick; Venturini, Janio; Spranger, Robert J.; van Wüllen, Leo & Nilges, Tom
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Novel electrospun PAN-based solid polymer electrolytes for lithium-ion batteries ACS , March 2022, San Diego. (Posterbeitrag)
A. Kirchberger, P. Walke, J. Venturini & T. Nilges
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“Electrospun Polyethylene Oxide based Sodium Ion Conductors for All-Solid-State Sodium Batteries” (Posterbeitrag) ECS Prime, Honolulu, Oktober 2024
D. F. Weindl, D. Sarkar & T. Nilges
