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Research Article | Open Access

Enhanced safety of sulfone-based electrolytes for lithium-ion batteries: broadening electrochemical window and enhancing thermal stability

Qiaojun Li1,†, Wenya Wu1,†, Yu Li1,2( ), Haixia Ren1, Chuan Wu1,2( ), Ying Bai1,2( )
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing 314019, China

† Qiaojun Li and Wenya Wu contributed equally to this work.

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Abstract

To meet the demands of high-voltage lithium-ion batteries (LIBs), we develop a novel electrolyte through theoretical calculations and electrochemical characterization. Triphenylphosphine oxide (TPPO) is introduced as a film-forming additive into a sulfone-based electrolyte containing 1 mol L−1 lithium difluoro(oxalate)borate. Density functional theory calculations show that TPPO has a lower reduction potential than the sulfone-based solvent. Hence, TPPO should be oxidized before the sulfone-based solvent and form a cathode electrolyte interphase layer on the Li-rich cathode. Our research findings demonstrate that adding 2 wt% TPPO to the sulfone-based electrolyte considerably enhances the ionic conductivity within a range of 20–60 ℃. In addition, it increases the discharge capacity of LIBs in a range of 2–4.8 V while maintaining excellent rate performance and cycling stability. Flammability tests and thermal gravimetric analysis results indicate excellent nonflammability and thermal stability of the electrolyte.

Keywords

lithium-ion batteriessulfone-based electrolyteselectrolyte additivenonflammabilitythermal stability

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Energy Materials and Devices
Volume 1 Issue 2,
December 2023
Article number: 9370022
DOI: 10.26599/EMD.2023.9370022
Cite this article:
Li Q, Wu W, Li Y, et al. Enhanced safety of sulfone-based electrolytes for lithium-ion batteries: broadening electrochemical window and enhancing thermal stability. Energy Materials and Devices, 2023, 1(2): 9370022. https://doi.org/10.26599/EMD.2023.9370022

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Received: 03 January 2024
Revised: 20 January 2024
Accepted: 21 January 2024
Published: 30 January 2024
© The Author(s) 2023. Published by Tsinghua University Press.

The articles published in this open access journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
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