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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 16: Energy Storage and Batteries I
CPP 16.4: Vortrag
Dienstag, 18. März 2025, 10:30–10:45, H34
Multipoint Anionic Bridge: Asymmetric Solvation Structure Improves the Stability of Lithium-Ion Batteries — •Tianle Zheng1, Ya-jun Cheng2, and Peter Müller-Buschbaum1 — 1TUM School of Natural Sciences, Chair for Functional Materials, Garching, Germany — 2Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo, 315201, Zhejiang Province, P. R. China
In this study, a novel concept of multipoint anionic bridge (MAB) is proposed and proved, which utilizes anions with different sites to connect with the asymmetric solvation structure (ASS). Compared to usual solvation structures, this study uses the multifunctional groups of difluoro(oxalate)borate anion, which can connect with Li ions. By tailoring the concentration, the anion serves as a bridge between different solvated structures. In-situ techniques and simulations investigate electrolytes to draw correlations between solvation structures and reaction pathways. The proposed design demonstrates remarkable high-temperature performance on both the anode and cathode sides, enabling stable cycling of lithium cobalt oxide (LCO)||graphite (0.5 Ah, 1.0 C) pouch cell for over 200 cycles at 80 °C, and facilitating Li||MCMB and Li||lithium iron phosphate (LFP) cells to deliver stable performance for 200 cycles at 100 °C. This work paves a way to develop high-performance electrolyte systems by designing and using new multipoint anions to construct ASSs.
Keywords: High concentration electrolyte; Lithium ion battery; Solvation structure; High temperature; Solid electrode/electrolyte interface