SKM 2023 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster Session I
CPP 17.50: Poster
Monday, March 27, 2023, 18:00–20:00, P3
High-concentration Lithium-ion Electrolyte Overcomes the Challenges of High-temperature Lithium Batteries — •Tianle Zheng1,2, Ya-jun Cheng2, and Peter Müller-Buschbaum1,3 — 1TUM School of Natural Sciences, Chair for Functional Materials, 85748 Garching, Germany — 2Ningbo Institute of Materials Technology & Engineering, CAS, Ningbo, 315201, P. R. China — 3TUM, MLZ, 85748 Garching, Germany
Conventional Li-ion batteries are severely constrained in high-temperature applications due to the low thermal stability of the electrolyte/electrode interface and electrolyte decomposition in the cell. Herein, we demonstrate a new electrolyte that achieves an excellent stable long-term cycling at 100 °C, well beyond the typical 60 °C limits of normal conventional Li-ion batteries. High concentrated lithium oxalyldifluoroborate (LiODFB) is selected as the lithium salt with a carefully designed high thermal stability solvent group. As a result, this unique high-concentration electrolyte can promote to form a stable and inorganic solid electrolyte interface layer on the electrode at elevated temperature, leading to improved performance in MCMB/Li and lithium iron phosphate (LFP)/Li half-cells, and achieve reversible capacities of 160 and 350 mA h/g, respectively, with Coulombic efficiencies > 99.3%. Subsequently, we further investigate the mechanism of high concentration LiODFB electrolytes by molecular dynamics simulations and XPS characterization techniques, exploring a new way for future high-temperature electrolytes.