Physicochemical and electrochemical properties of 1,1,2,2‐tetrafluoroethyl‐2,2,3,3‐tetrafluoropropyl ether as a co‐solvent for high‐voltage lithium‐ion electrolytes

Xia, Lan and Lee, Saixi and Jiang, Yabei and Li, Shiqi and Liu, Zhaoping and Yu, Linpo and Hu, Di and Wang, Shuhan and Liu, Yitong and Chen, George Z. (2019) Physicochemical and electrochemical properties of 1,1,2,2‐tetrafluoroethyl‐2,2,3,3‐tetrafluoropropyl ether as a co‐solvent for high‐voltage lithium‐ion electrolytes. ChemElectroChem, 6 (14). pp. 3747-3755. ISSN 2196-0216

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Abstract

Although high voltage positive materials for high energy density lithium-ion batteries have gained a great attention, the lack of compatible electrolytes with sufficiently high oxidative stability to deliver an excellent cycling ability restricts theirpractical application. Fluorinated solvents are considered as promising candidates for high-voltage electrolyte solvents. In this study, we select 1, 1, 2, 2-Tetrafluoroethyl-2, 2, 3, 3-tetrafluoropropyl ether (TTE) with high boiling point, low cost and good SEI-filming ability as a co-solvent of fluoroethylene carbonate-based electrolytes and extensively investigate its physicochemical and electrochemical properties for its applications in high-voltage lithium-ion batteries. Our experimental results show that the TTE-containing electrolyte exhibits not only a high oxidative stability up to 5.5 V (vs. Li/Li+), but also excellent wettability with the separator. Except for the high discharge capacity and increased coulombic efficiency of the Li/LiNi0.5Mn1.5O4half-cells assembled with the TTE-containing electrolyte cycled between 3.0 and 4.9 V, the cell also displays a high rate capability. This work shows that partially fluorinated ethers, e.g. TTE, are promising cosolvent for high-voltage electrolytes that can enable commercial development of high energy density lithium-ion batteries.

Item Type: Article
Additional Information: This publication is under Global University Publications Licence. This is the peer reviewed version of the following article: L. Xia, S. Lee, Y. Jiang, S. Li, Z. Liu, L. Yu, D. Hu, S. Wang, Y. Liu, G. Z. Chen, ChemElectroChem 2019, 6, 3747., which has been published in final form at https://doi.org/10.1002/celc.201900729. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Keywords: lithium-ion battery; high-voltage; solvent; fluorinated ether; 1, 1, 2, 2-tetrafluoroethyl-2, 2, 3, 3-tetrafluoropropyl ether
Schools/Departments: University of Nottingham Ningbo China > Faculty of Science and Engineering > Department of Chemical and Environmental Engineering
Identification Number: https://doi.org/10.1002/celc.201900729
Depositing User: Yu, Tiffany
Date Deposited: 28 Aug 2019 09:54
Last Modified: 23 Jul 2020 04:30
URI: http://eprints.nottingham.ac.uk/id/eprint/57299

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