Regensburg 2022 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 12: Poster 1
CPP 12.14: Poster
Montag, 5. September 2022, 18:00–20:00, P1
Influence of Li Salt concentration in poly(propylene carbonate) based solid polymer electrolytes — •Thien An Pham1,2, Ralph Gilles1, and Peter Müller-Buschbaum1,2 — 1MLZ, TU München, 85748 Garching — 2TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching
Li metal exhibits a high specific capacity as well as a low discharge potential that makes it interesting as an anode material for Li ion batteries. But Li dendrite growth remains a major safety in cells with liquid electrolyte. Solid polymer electrolytes (SPE) show a higher mechanical stability in comparison to their liquid counterparts and thus, can inhibit dendrite growth. In order to achieve even higher energy densities, high-energy cathode materials such as Ni rich layered transition metal oxides should be combined with Li metal anodes. However, the high operation potentials of those cathodes are a challenge for SPE. Poly(propylene carbonate) (PPC) has an intrinsically high oxidation voltage exceeding 4.5 V making it suitable for high voltage operation. Here, SPE with PPC as polymer host and Lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) as Li salt are prepared and the influence of the salt concentration on the SPE properties are studied with electrochemical impedance spectroscopy and differential scanning calorimetry. Results have shown that the ionic conductivity increasing and the glass transition temperature is decreasing with higher amount of LiTFSI.