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- Title
Rational Screening of High-Voltage Electrolytes and Additives for Use in LiNi 0.5 Mn 1.5 O 4 -Based Li-Ion Batteries.
- Authors
Drozhzhin, Oleg A.; Shevchenko, Vitalii A.; Bobyleva, Zoia V.; Alekseeva, Anastasia M.; Antipov, Evgeny V.
- Abstract
In the present work, we focus onthe experimental screening of selected electrolytes, which have been reported earlier in different works, as a good choice for high-voltage Li-ion batteries. Twenty-four solutions were studied by means of their high-voltage stability in lithium half-cells with idle electrode (C+PVDF) and the LiNi0.5Mn1.5O4-based composite as a positive electrode. Some of the solutions were based on the standard 1 M LiPF6 in EC:DMC:DEC = 1:1:1 with/without additives, such as fluoroethylene carbonate, lithium bis(oxalate) borate and lithium difluoro(oxalate)borate. More concentrated solutions of LiPF6 in EC:DMC:DEC = 1:1:1 were also studied. In addition, the solutions of LiBF4 and LiPF6 in various solvents, such as sulfolane, adiponitrile and tris(trimethylsilyl) phosphate, atdifferent concentrations were investigated. A complex study, including cyclic voltammetry, galvanostatic cycling, impedance spectroscopy and ex situ PXRD and EDX, was applied for the first time to such a wide range of electrolytesto provide an objective assessment of the stability of the systems under study. We observed a better anodic stability, including a slower capacity fading during the cycling and lower charge transfer resistance, for the concentrated electrolytes and sulfolane-based solutions. Among the studied electrolytes, the concentrated LiPF6 in EC:DEC:DMC = 1:1:1 performed the best, since it provided both low SEI resistance and stability of the LiNi0.5Mn1.5O4 cathode material.
- Subjects
FLUOROETHYLENE; LITHIUM-ion batteries; ELECTROLYTES; ELECTROLYTE solutions; CHARGE transfer; CYCLIC voltammetry
- Publication
Molecules, 2022, Vol 27, Issue 11, p3596
- ISSN
1420-3049
- Publication type
Article
- DOI
10.3390/molecules27113596