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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 1: Energy Storage and Batteries I
CPP 1.2: Vortrag
Montag, 18. März 2024, 10:00–10:15, H 0106
Real-time monitoring of electrochemical reactions in all-solid-state lithium batteries by simultaneous grazing-Incidence small-angle/wide-angle X-ray scattering — •Yuxin Liang1, Tianle Zheng1, Kun Sun1, Fabian A.C. Apfelbeck1, Ian Sharp2, Yajun Cheng3, Matthias Schwartzkopf4, Stephan V. Roth4,5, and Peter Müller-Buschbaum1,6 — 1TUM School of Natural Sciences, Chair for Functional Materials, Garching, Germany — 2WSI, TUM, Garching, Germany — 3NIMTE, Chinese Academic of Sciences, Ningbo, China — 4DESY, Hamburg, Germany — 5KTH Royal Institute of Technology, Stockholm, Sweden — 6MLZ, TUM, Garching, Germany
Polyethylene oxide (PEO)-based composite electrolytes (PCEs) are promising for lithium batteries due to its high safety. However, the material suffers from low conductivity, inhibiting its commercialization. Therefore, it is crucial to understand the electrochemcial process in PCE-based batteries. Using operando grazing-incidence small-angle and wide-angle X-ray scattering, we find that the electrochemical reaction is highly correlated with the buried morphology and crystalline structure of the PCE. The PEO-Li+ reduction and TFSI- decomposition cause changes in both the crystalline structure and morphology. In addition, the reversible Li diffusion process alters the inner morphology, rather than causing structure changes. This work provides a new path to monitor a working battery, thereby enabling detailed understanding of electrochemically-induced changes, which is essential for developing interface stable lithium batteries.
Keywords: all-solid-state lithium batteries; composite electrolyte; operando study; Synchrotron x-ray scattering