Suppression of Aluminum Corrosion in Lithium Bis(trifluoromethanesulfonyl)imidebased Electrolytes by the Addition of Fumed Silica

Title
Suppression of Aluminum Corrosion in Lithium Bis(trifluoromethanesulfonyl)imidebased Electrolytes by the Addition of Fumed Silica
Authors
Hamenu LouisYoung-Gi LeeKwang Man Kim조원일Jang Myoun Ko
Keywords
Al corrosion; LiTFSI-based electroltyes; Fuemed silica; Gel electrolytes
Issue Date
2013-06
Publisher
Bulletin of the Korean Chemical Society
Citation
VOL 34, NO 6, 1795-1799
Abstract
The corrosion property of aluminum by lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt is investigated in liquid and gel electrolytes consisting of ethylene carbonate/propylene carbonate/ethylmethyl carbonate/diethyl carbonate (20:5:55:20, vol %) with vinylene carbonate (2 wt %) and fluoroethylene carbonate (5 wt %) using conductivity measurement, cyclic voltammetry, scanning electron microscopy, and energy dispersive X-ray spectroscopy. All corrosion behaviors are attenuated remarkably by using three gel electrolytes containing 3 wt % of hydrophilic and hydrophobic fumed silica. The addition of silica particles contributes to the increase in the ionic conductivity of the electrolyte, indicating temporarily formed physical crosslinking among the silica particles to produce a gel state. Cyclic voltammetry also gives lower anodic current responses at higher potentials for repeating cycles, confirming further corrosion attenuation or electrochemical stability. In addition, the degree of corrosion attenuation can be affected mainly by the electrolytic constituents, not by the hydrophilicity or hydrophobicity of silica particles.
URI
http://pubs.kist.re.kr/handle/201004/45026
ISSN
02532964
Appears in Collections:
KIST Publication > Article
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