SKM 2023 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster Session I
CPP 17.46: Poster
Montag, 27. März 2023, 18:00–20:00, P3
Study of PEO Composite Electrolyte in All-solid-state Lithium Batteries — •Yuxin Liang1, Zhuijun Xu1, Kun Sun1, Tianfu Guan1, Fabian A.C. Apfelbeck1, Pan Ding2, Ian Sharp2, Matthias Schwartzkopf3, Stephan V. Roth3,4, and Peter Müller-Buschbaum1,5 — 1TUM School of Natural Sciences, Chair for Functional Materials, Garching, Germany — 2TUM Walter Schottky Institute, Experimental Semiconductor Physics, Garching, Germany — 3DESY, 22607 Hamburg, Germany — 4KTH Royal Institute of Technology, Stockholm Sweden — 5MLZ, TUM, 85748 Garching
Lithium batteries (LBs) with composite electrolyte present good ionic conductivity, flexibility and intimate contact with electrodes. However, lithium dendrites will grow and the Coulombic efficiency (CE) will decrease with Li plating and stripping. Moreover, the poly(ethylene oxide) (PEO)-based electrolyte undergoes serious oxidation on the cathode side at high voltage and cause the battery collapse. Strategies have been applied to alleviate the abovementioned challenges, nevertheless, fundamental research on the degradation mechanism of the PEO electrolyte is still lacking. It is of great value to get a deeper understanding and therefore optimize the electrolyte for high voltage LBs. Herein, we select PEO/Al2O3 as composite electrode to understand the degradation process. The Li/cathode cells are assembled to observe the battery performance and grazing incidence wide-angle X-ray scattering (GIWAXS) is used to detect morphology changes of the electrolyte before and after cycling.