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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 32: Poster Session II
CPP 32.22: Poster
Thursday, March 20, 2025, 09:30–12:00, P3
Operando study on structure-activity relationship between electrolyte components and electrochemical performance for all-solid-state lithium batteries — •Yingying Yan1, Liangzhen Liu2, Yuxin Liang1, Fabian A.C. Apfelbeck1, Guangjiu Pan1, Lyuyang Cheng1, Roland A. Fischer2, and Peter Müller-buschbaum1 — 1TUM School of Natural Sciences, Chair for Functional Materials, 85748 Garching, Germany — 2TUM School of Natural Sciences, Chair of Inorganic and Metal-Organic Chemistry, 85748 Garching, Germany
All-solid-state lithium-ion batteries (ASSLIBs) are the most promising power sources for high-safety and high-energy-density energy storage devices. However, the practical application of ASSLBs has been hindered by poor interfacial stability and inferior ionic conductivity. Herein, a layered-double-hydroxide (LDH) reinforced poly(ethylene oxide) (PEO) composite polymer electrolyte is designed, which delivers a wide electrochemical window, high ionic conductivity, and superior Li+ transference number with a low LDH loading. The Li symmetric cells show ultra-long cycling stability at 0.1 mAh/cm2. The all-solid-state Li//LiFePO4 exhibits an excellent cycling stability with a high capacity retention of 90.1% at 0.1 C over 250 cycles. Furthermore, the structure-activity relationship between the component structure of the electrolyte and the electrochemical performance was elucidated by operando nanofocus wide-angle X-ray scattering (nWAXS).
Keywords: All-solid-state lithium batteries; Composite polymer electrolytes; Layered double Hydroxide; Operando nanofocus WAXS