Publications by authors named "Marius Amereller"

3 Publications

  • Page 1 of 1

Impact of Selected LiPF Hydrolysis Products on the High Voltage Stability of Lithium-Ion Battery Cells.

ACS Appl Mater Interfaces 2016 Nov 4;8(45):30871-30878. Epub 2016 Nov 4.

MEET Battery Research Center/Institute of Physical Chemistry, University of Münster , Corrensstrasse 46, 48149 Münster, Germany.

Diverse LiPF hydrolysis products evolve during lithium-ion battery cell operation at elevated operation temperatures and high operation voltages. However, their impact on the formation and stability of the electrode/electrolyte interfaces is not yet investigated and understood. In this work, literature-known hydrolysis products of LiPF dimethyl fluorophosphate (DMFP) and diethyl fluorophosphate (DEFP) were synthesized and characterized. The use of DMFP and DEFP as electrolyte additive in 1 M LiPF in EC:EMC (1:1, by wt) was investigated in LiNiMnCoO/Li half cells. When charged to a cutoff potential of 4.6 V vs Li/Li, the additive containing cells showed improved cycling stability, increased Coulombic efficiencies, and prolonged shelf life. Furthermore, low amounts (1 wt % in this study) of the aforementioned additives did not show any negative effect on the cycling stability of graphite/Li half cells. DMFP and DEFP are susceptible to oxidation and contribute to the formation of an effective cathode/electrolyte interphase as confirmed by means of electrochemical stability window determination, and X-ray photoelectron spectroscopy characterization of pristine and cycled electrodes, and they are supported by computational calculations.
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http://dx.doi.org/10.1021/acsami.6b09164DOI Listing
November 2016

A novel method for in situ measurement of solubility via impedance scanning quartz crystal microbalance studies.

Chem Commun (Camb) 2011 Jun 19;47(24):6984-6. Epub 2011 May 19.

Institut für Physikalische und Theoretische Chemie, Universität Regensburg, D93053 Regensburg, Germany.

We introduce here a novel in situ measurement method for solubility of solids in various liquids. Without any calibration the saturation point can be obtained in a relative manner. We exemplified the new method at four systems including water, organic carbonates and an ionic liquid as the solvents and various salts as dissolved solids.
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http://dx.doi.org/10.1039/c1cc10642bDOI Listing
June 2011

Chloride-free method to synthesise new ionic liquids with mixed borate anions.

Chemistry 2009 ;15(10):2270-2

Institute for Physical and Theoretical Chemistry, University Regensburg, Universitätsstrasse 31, 93053 Regensburg, Germany.

Chloride avoided! A new chloride-free method to synthesise ionic liquids (ILs) with mixed borate anions, starting from tetrafluoroborate compounds, has been developed and a number of examples including some new ILs are presented (see scheme; [CAT](+) = cation). It is widely applicable and allows access to mixed borates with various types of ligands in a straightforward manner.
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http://dx.doi.org/10.1002/chem.200802243DOI Listing
June 2009
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