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

Lan Xia, Saixi Lee, Yabei Jiang, Shiqi Li, Zhaoping Liu, Linpo Yu, Di Hu, Shuhan Wang, Yitong Liu, George Z. Chen

Research output: Journal PublicationArticlepeer-review

18 Citations (Scopus)
2 Downloads (Pure)

Abstract

Although high-voltage positive electrode 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 their practical 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 a 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 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. In addition to high discharge capacity and increased coulombic efficiency of the Li/LiNi0.5Mn1.5O4 half-cell 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 co-solvents for high-voltage electrolytes that can enable commercial development of high energy density lithium-ion batteries.

Original languageEnglish
Pages (from-to)3747-3755
Number of pages9
JournalChemElectroChem
Volume6
Issue number14
DOIs
Publication statusPublished - 15 Jul 2019

Keywords

  • electrolyte
  • fluorinated ether
  • high-voltage
  • lithium-ion battery
  • solvent

ASJC Scopus subject areas

  • Catalysis
  • Electrochemistry

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