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

Energies

Isidora Cekic-Laskovic¹  Lukas Ibing²  Peter Hilbig²  Martin Winter² 

[1] Helmholtz-Institute Münster, IEK-12, Forschungszentrum Jülich GmbH, Corrensstrasse 46, 48149 Münster, Germany;MEET Battery Research Center/Institute of Physical Chemistry, University of Münster, Corrensstrasse 46, 48149 Münster, Germany;

关键词: lithium-ion batteries;    non-aqueous electrolyte;    nitrile-based solvents;    butyronitrile;    SEI forming additives;    fast charging;   

DOI  :  10.3390/en12152869

来源: DOAJ

【 摘 要 】

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).

【 授权许可】

Unknown