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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 35: Poster Session II
CPP 35.15: Poster
Wednesday, March 29, 2023, 11:00–13:00, P1
Design, fabrication and nano-scale characterization of novel SEI layers — •Zhuijun Xu1, Yajun Cheng2, Yonggao Xia2, and Peter Müller-Buschbaum1,3 — 1TUM School of Natural Sciences, Chair for Functional Materials, 85748 Garching, Germany — 2Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 315201, Ningbo, China — 3MLZ, TUM, 85748 Garching, Germany
Rechargeable lithium metal batteries have been recognized as one of the most promising energy storage devices due to their superior energy density. However, serious safety concerns and poor cyclability are challenges originating from an uncontrolled lithium dendrite growth and an unstable solid electrolyte interface (SEI) layer. SEI can be enhanced by synergetic additives in commercial electrolytes. Herein, amphiphilic block copolymers/inorganic materials--PS-b-PEO/LiNO3 as additives, which bear some clear advantages including absorbing mechanical stress, conducting lithium ion and controlling the lithium dendrite growth, are mixed with commercial electrolytes and applied in the lithium metal battery. Remarkably, Li symmetric cells have a long-term cycling life over 300 h with a capacity of 3 mAh cm-2. Moreover, full battery with lithium metal anode and LiFePO4 exhibits a stable and high capacity of 138 mAh g-1 at 1 C. With ex-situ scattering techniques or in-situ scattering studies, the structures of the surface modified lithium metal anodes and structure formation processes are studied.