Dec 8 – 9, 2022
Marriott
Europe/Berlin timezone

Use of High-concentration Lithium-ion Electrolyte to Overcome Challenges of High-temperature Lithium Batteries

Dec 9, 2022, 2:00 PM
3h
Marriott

Marriott

Board: P-059
Poster Material Science Poster Session

Speaker

Tianle Zheng (Technische Universität München)

Description

Lithium secondary batteries (LSBs) have witnessed explosive growth in the last decade. Traditional Li-ion batteries, on the other hand, are severely constrained in high-temperature applications due to the low thermal stability of the electrolyte/electrode interface and electrolyte decompositions 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. The high concentrated lithium oxalyldifluoroborate (LiODFB) is selected as the only lithium salt with a carefully designed high thermal stability solvent group. As a result, this unique high-concentration electrolyte promotes the formation of a stable and inorganic solid electrolyte interface (SEI) layer on the electrode at elevated temperature, leading to improved performance in MCMB/Li and lithium iron phosphate (LFP)/Li half-cells. Moreover, it achieves reversible capacities of 160 and 350 mA h/g, respectively, with Coulombic efficiencies (CEs) > 99.3%. Subsequently, we further investigate the mechanism of high concentration LiODFB electrolytes by molecular dynamics (MD) simulations and XPS characterization techniques, exploring a new way for future high-temperature electrolytes for Li-ion batteries.

Primary author

Tianle Zheng (Technische Universität München)

Co-authors

Prof. Yajun Cheng Peter Müller-Buschbaum (TU München, Physik-Department, LS Funktionelle Materialien)

Presentation materials

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