Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 60: Solid-Liquid Interfaces: Structure, Spectroscopy, Reactions and Electrochemistry

O 60.11: Poster

Dienstag, 21. März 2017, 18:30–20:30, P2-OG2

Influence of Mg2+ und Li+ Ions on the electrochemical decomposition of BMP TFSI on Au electrodes — •Dorothea Alwast1, Gülsah Yetis1, Johannes Schnaidt2, and R. Jürgen Behm1,21Ulm University, Institute of Surface Chemistry and Catalysis, D-89069 Ulm, Germany — 2Helmholtz-Institute Ulm (HIU) Electrochemical Energy Storage, D-89081 Ulm, Germany

Many ionic liquids (ILs) are known for their high electrochemical stabilities and therefore, in combination with Li+ and Mg2+ salts, are regarded as promising electrolytes for lithium-ion or magnesium batteries, respectively. In order to improve these batteries, a fundamental understanding of the interaction between the IL and said metal salts is necessary which determines the stability of the electrolyte. The influence of Li+ and Mg2+ cations on the decomposition of the IL N-butyl-N-methylpyrrolidinium-bis(trifluoromethanesulfonyl)imide (BMP TFSI) is studied by differential electrochemical mass spectrometry (DEMS). Thus, volatile decomposition products can be detected during cyclovoltammetric measurements. We show that the addition of LiTFSI and MgTFSI2 diminishes the stability window of the IL at both positive and negative potentials. In the presence of the metal cations, products of the TFSI anion decomposition are detected during the negative potential scan, whereas no BMP reduction is observed. Further effects of the metal salts on the IL degradation in comparison to the behavior of the pure IL will be discussed.

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