期刊
JOURNAL OF POWER SOURCES
卷 323, 期 -, 页码 134-141出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.05.053
关键词
Lithium ion battery; High voltage spinel; Fluorinated solvents; High voltage electrolyte
资金
- National 863 Program [2014AA052202]
- National Natural Science Foundation of China [21373137]
- Shanghai Science and Technology Engineering Research Center Program [13DZ2280200, 15DZ2282000]
A new electrolyte based on fluorinated 3-(1,1,2,2-tetrafluoroethoxy)-1,1,2,2-tetrafluoropropane (F-EPE) solvent is studied in LiNi0.5Mn1.5O4/Li cells. The electrochemical stability of the electrolyte with 10% F-EPE is carried out by linear sweep voltammetry and electrochemical floating test. These results indicate that the electrolyte with F-EPE has an oxidation potential of more than 5.2 V vs. Li+/Li, which is higher than that without F-EPE and enlarges the oxidative window of electrolyte. A thin and uniform SEI layer is formed on the surface of LiNi0.5Mn1.5O4 cathode by using electrolyte with F-EPE, leads to an improvement in the electrochemical performance, validated by charge-discharge tests, EIS, SEM, TEM, and XPS analysis. (C) 2016 Elsevier B.V. All rights reserved.
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