SKM 2021 – wissenschaftliches Programm
CPP 8.12: Poster
Mittwoch, 29. September 2021, 17:30–19:30, P
Poly(propylene carbonate) as a solid polymer electrolyte — •Thien An Pham1,2, Ralph Gilles1, and Peter Müller-Buschbaum1,2 — 1Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Garching, Germany — 2Technische Universität München, Physik- Department, Lehrstuhl für Funktionelle Materialien, Garching, Germany
Li dendrite growth was identified as one of the main obstacles preventing Li metal as anode material in commercial batteries with liquid electrolytes since it can cause short circuits, and, ultimately, generate safety concerns. By using solid polymer electrolytes (SPE), the safety of the lithium-ion battery cell can be increased since they offer higher mechanical stability impeding Li dendrite growth. There has been a lot research on poly(ethylene oxide) (PEO) based SPE for the use with Li metal anodes since it offers high ionic conductivity. However, PEO is only stable up to potentials of 4V and thus, cannot be used with state of the art cathode materials like LiNi1−x−yMnxCoyO2 that normally are operated at voltages above 4V. Aliphatic polycarbonates such as poly(ethylene carbonate) (PEC) or poly(propylene carbonate) (PPC) have intrinsically higher oxidation voltages than PEO making them suitable for high energy cathodes. Here, thin PPC films with different amount of Lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) as Li salt are prepared via drop casting method and studied with electrochemical impedance spectroscopy in order to determine the ionic conductivity.