Study of Electrolyte Components in Li Ion Cells Using Liquid-Liquid Extraction and Gas Chromatography Coupled with Mass Spectrometry

LiCoO2/graphite and LiNi0.33Mn0.33Co0.33O2/graphite Li-ion pouch-type cells filled with 1 M LiPF6 EC: EMC (3:7 by weight) with the additives vinylene carbonate (VC) or vinyl ethylene carbonate (VEC) were prepared. Some cells underwent partial or complete formation while others underwent full formati...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 2014-01, Vol.161 (6), p.A1167-A1172
Main Authors: Petibon, R., Rotermund, L., Nelson, K. J., Gozdz, A. S., Xia, Jian, Dahn, J. R.
Format: Article
Language:English
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Summary:LiCoO2/graphite and LiNi0.33Mn0.33Co0.33O2/graphite Li-ion pouch-type cells filled with 1 M LiPF6 EC: EMC (3:7 by weight) with the additives vinylene carbonate (VC) or vinyl ethylene carbonate (VEC) were prepared. Some cells underwent partial or complete formation while others underwent full formation followed by charge-discharge cycling or high potential storage. Following a simple liquid-liquid extraction step, the mass ratios of the organic components of the electrolyte were analyzed using gas chromatography (GC) coupled with electron impact mass spectroscopy (MS). This semi-quantitative method proved to be very effective for the removal of the LiPF6 from the electrolyte, thus preventing damage to the gas chromatograph and mass spectrometer. It also allowed for a quick and simple assessment of the consumption of additives as a function of state of charge and cycling. The purpose of this paper is to make this method widely available to the Li-ion battery research community.
ISSN:0013-4651
1945-7111
DOI:10.1149/2.117406jes