| Autor: |
Drozhzhin OA; Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia., Shevchenko VA; Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia.; Skoltech Center for Energy Science and Technology, Skolkovo Institute of Science and Technology, Nobel Str. 3, 143026 Moscow, Russia., Bobyleva ZV; Department of Material Science, Lomonosov Moscow State University, 119991 Moscow, Russia., Alekseeva AM; Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia., Antipov EV; Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia.; Skoltech Center for Energy Science and Technology, Skolkovo Institute of Science and Technology, Nobel Str. 3, 143026 Moscow, Russia. |
| Jazyk: |
angličtina |
| Zdroj: |
Molecules (Basel, Switzerland) [Molecules] 2022 Jun 03; Vol. 27 (11). Date of Electronic Publication: 2022 Jun 03. |
| DOI: |
10.3390/molecules27113596 |
| Abstrakt: |
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 LiNi 0.5 Mn 1.5 O 4 -based composite as a positive electrode. Some of the solutions were based on the standard 1 M LiPF 6 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 LiPF 6 in EC:DMC:DEC = 1:1:1 were also studied. In addition, the solutions of LiBF 4 and LiPF 6 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 LiPF 6 in EC:DEC:DMC = 1:1:1 performed the best, since it provided both low SEI resistance and stability of the LiNi 0.5 Mn 1.5 O 4 cathode material. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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