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Open AccessFeature PaperArticle

Butyronitrile-Based Electrolytes for Fast Charging of Lithium-Ion Batteries

1
MEET Battery Research Center/Institute of Physical Chemistry, University of Münster, Corrensstrasse 46, 48149 Münster, Germany
2
Helmholtz-Institute Münster, IEK-12, Forschungszentrum Jülich GmbH, Corrensstrasse 46, 48149 Münster, Germany
*
Author to whom correspondence should be addressed.
Energies 2019, 12(15), 2869; https://doi.org/10.3390/en12152869
Received: 19 June 2019 / Revised: 17 July 2019 / Accepted: 18 July 2019 / Published: 25 July 2019
(This article belongs to the Special Issue Energy Storage Systems for Electric Vehicles)
After determining the optimum composition of the butyronitrile: ethylene carbonate: fluoroethylene carbonate (BN:EC:FEC) solvent/co-solvent/additive mixture, the resulting electrolyte formulation (1M LiPF6 in BN:EC (9:1) + 3% FEC) was evaluated in terms of ionic conductivity and the electrochemical stability window, as well as galvanostatic cycling performance in NMC/graphite cells. This cell chemistry results in remarkable fast charging, required, for instance, for automotive applications. In addition, a good long-term cycling behavior lasts for 1000 charge/discharge cycles and improved ionic conductivity compared to the benchmark counterpart was achieved. XPS sputter depth profiling analysis proved the beneficial behavior of the tuned BN-based electrolyte on the graphite surface, by confirming the formation of an effective solid electrolyte interphase (SEI). View Full-Text
Keywords: lithium-ion batteries; non-aqueous electrolyte; nitrile-based solvents; butyronitrile; SEI forming additives; fast charging lithium-ion batteries; non-aqueous electrolyte; nitrile-based solvents; butyronitrile; SEI forming additives; fast charging
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Hilbig, P.; Ibing, L.; Winter, M.; Cekic-Laskovic, I. Butyronitrile-Based Electrolytes for Fast Charging of Lithium-Ion Batteries. Energies 2019, 12, 2869.

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