Next Article in Journal
Separation of Small DNAs by Gel Electrophoresis in a Fused Silica Capillary Coated with a Negatively Charged Copolymer
Previous Article in Journal
Porous Alumosilicate Aggregate as Lead Ion Sorbent in Wastewater Treatments
Article Menu

Export Article

Open AccessArticle
Separations 2017, 4(3), 26; doi:10.3390/separations4030026

Capillary Electrophoresis as Analysis Technique for Battery Electrolytes: (i) Monitoring Stability of Anions in Ionic Liquids and (ii) Determination of Organophosphate-Based Decomposition Products in LiPF6-Based Lithium Ion Battery Electrolytes

1
MEET Battery Research Center, Institute of Physical Chemistry, University of Muenster, Corrensstraße 46, 48149 Muenster, Germany; marcelina.pyschik@uni-muenster.de
2
Forschungszentrum Juelich GmbH, Helmholtz Institute Muenster, IEK-12, Corrensstraße 46, 48149 Muenster, Germany
*
Author to whom correspondence should be addressed.
Received: 1 August 2017 / Revised: 17 August 2017 / Accepted: 24 August 2017 / Published: 5 September 2017
(This article belongs to the Special Issue Ionic Liquid for Separations)
View Full-Text   |   Download PDF [13135 KB, uploaded 8 September 2017]   |  

Abstract

In this work, a method for capillary electrophoresis (CE) hyphenated to a high-resolution mass spectrometer was presented for monitoring the stability of anions in ionic liquids (ILs) and in commonly used lithium ion battery (LIB) electrolytes. The investigated ILs were 1-methyl-1-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PYR13TFSI) and 1-methyl-1-propylpyrrolidinium bis(fluorosulfonyl)imide (PYR13FSI). The method development was conducted by adjusting the following parameters: buffer compositions, buffer concentrations, and the pH value. Also the temperature and the voltage applied on the capillary were optimized. The ILs were aged at room temperature and at 60 °C for 16 months each. At both temperatures, no anionic decomposition products of the FSI− and TFSI− anions were detected. Accordingly, the FSI− and TFSI− anions were thermally stable at these conditions. This method was also applied for the investigation of LIB electrolyte samples, which were aged at 60 °C for one month. The LP30 (50/50 wt. % dimethyl carbonate/ethylene carbonate and 1 M lithium hexafluorophosphate) electrolyte was mixed with the additive 1,3-propane sultone (PS) and with one of the following organophosphates (OP): dimethyl phosphate (DMP), diethyl phosphate (DEP), and triethyl phosphate (TEP), to investigate the influence of these compounds on the formation of OPs. View Full-Text
Keywords: ionic liquids; capillary electrophoresis; quadrupole time-of-flight mass spectrometer; thermal stability study; lithium ion battery electrolyte ionic liquids; capillary electrophoresis; quadrupole time-of-flight mass spectrometer; thermal stability study; lithium ion battery electrolyte
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Pyschik, M.; Winter, M.; Nowak, S. Capillary Electrophoresis as Analysis Technique for Battery Electrolytes: (i) Monitoring Stability of Anions in Ionic Liquids and (ii) Determination of Organophosphate-Based Decomposition Products in LiPF6-Based Lithium Ion Battery Electrolytes. Separations 2017, 4, 26.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Separations EISSN 2297-8739 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top