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 electrolytesTools Xia, Lan, Lee, Saixi, Jiang, Yabei, Li, Shiqi, Liu, Zhaoping, Yu, Linpo, Hu, Di, Wang, Shuhan, 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
Official URL: http://dx.doi.org/10.1002/celc.201900729
AbstractAlthough 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.
Actions (Archive Staff Only)
|
Tools
Tools
