期刊
JOURNAL OF POWER SOURCES
卷 265, 期 -, 页码 132-139出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2014.04.138
关键词
Ionic liquids; PYR13FSI; LiFSI; Aluminum current collector; Corrosion
资金
- Boulder Ionics Corporation through the Membrane Science, Engineering and Technology (MAST) Center at CU-Boulder, an NSF Industry-University Cooperative Research Center
- National Science Foundation [IIP-1152040]
- Directorate For Engineering
- Div Of Industrial Innovation & Partnersh [1152040] Funding Source: National Science Foundation
- Div Of Industrial Innovation & Partnersh
- Directorate For Engineering [1034720] Funding Source: National Science Foundation
The superior suppression of aluminum current collector oxidation by a 1.2 M LiFSI in PYR13FSI ionic liquid electrolyte is demonstrated. Addition of EC:EMC (1:2 wt.) is shown to significantly increase the severity of parasitic aluminum oxidation. Despite leading to increased aluminum oxidation at high voltages (>4.2 V vs. Li/Li+), adding organic solvent to PYR13FSI based ionic liquids greatly enhances important electrochemical properties. The ionic conductivity and lithium ion transference number of the PYR13FSI + 1.2 M LiFSI electrolyte increase with increasing volumetric content of organic co-solvent (EC:EMC), resulting in significant improvements to high rate performance. The electrochemical benefits of organic co-solvent addition and the compatibility of the PYR13FSI + 1.2 M LiFSI electrolyte with Li(Ni(1/3)Mn(1/3)sCo(1/3))O-2 demonstrated in this study substantiate the need to develop strategies to suppress aluminum oxidation during high voltage cycling of lithium-ion batteries in ionic liquid electrolytes. (c) 2014 Elsevier B.V. All rights reserved.
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