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Corrosion/Passivation Behavior of Concentrated Ionic Liquid Electrolytes and Its Impact on the Li-Ion Battery Performance

Journal Article · · Journal of the Electrochemical Society
DOI:https://doi.org/10.1149/2.0161916jes· OSTI ID:1576697

The corrosion/passivation phenomenon of Al and stainless steel (SS) with an ionic liquid-based electrolyte N-methyl-N-propyl-piperidinium bis(fluorosulfonyl)imide (PMpipFSI)-LiFSI was systematically studied by cyclic voltammetry, and its impact on the battery performance was evaluated in NMC532/Li cell. Our results showed that these electrolytes could eliminate the Al corrosion due to their capability of forming a passivation layer during the first anodic scan after 3 V vs Li+/Li. In contrast, no passivation behavior was observed for SS electrode, and the corrosion reaction was kinetically suppressed when the lithium salt concentration increases. We demonstrated that while 1 M LiFSI-PMpipFSI extensively corrodes SS in a NMC532/Li cell, the 5 M electrolyte does not and actually enables the normal cycling of the cell both using SS-2032-coin cells. Further, when an Al-coated coin cells were used, the Coulombic efficiency dramatically improved from 90% to >99.9% with superior capacity retention at both room temperature and 55 degrees C.

Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1576697
Alternate ID(s):
OSTI ID: 1607633
Journal Information:
Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 16 Vol. 166; ISSN 0013-4651
Publisher:
IOP Publishing - The Electrochemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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