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Effect of Li+ and Mg2+ on the Electrochemical Decomposition of the Ionic Liquid 1‐Butyl‐1‐ methylpyrrolidinium bis(trifluoromethanesulfonyl)imide and Related Electrolytes
| Content Provider | Semantic Scholar |
|---|---|
| Author | Alwast, Dorothea Schnaidt, Johannes Hancock, Kurtus Yetis, Gülsah Behm, R. Jürgen |
| Copyright Year | 2019 |
| Abstract | We investigated the decomposition of 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (BMP-TFSI) based electrolytes on different electrode materials (Au and glassy carbon (GC)) in the absence and presence of Li(TFSI) and Mg(TFS)2. Detecting the volatile reaction products via differential electrochemical mass spectrometry (DEMS) measurements allowed us to identify different decomposition products and thus to gain insight into the decomposition mechanisms. In neat ionic liquid (IL) and on Au electrodes both ions are decomposed at reductive potentials. The TFSI anion mainly decomposes by splitting the S-C bond and releasing CF3, while for the BMP + cation ring opening and scission of either the methyl or the butyl side chain occur in parallel. At oxidative potentials the decomposition of the anion is the predominant process. Changing to the GC electrode increases the fraction of TFSI decomposition products at both cathodic and anodic potentials. The addition of Li results in Li deposition, but largely hinders the formation of volatile BMP-TFSI decomposition, which is tentatively related to the formation of an SEI layer. In contrast, addition of Mg promotes the TFSI decomposition at the expense of the BMP decomposition, while Mg deposition is essentially inhibited. |
| Starting Page | 3009 |
| Ending Page | 3019 |
| Page Count | 11 |
| File Format | PDF HTM / HTML |
| DOI | 10.1002/celc.201900371 |
| Volume Number | 6 |
| Alternate Webpage(s) | https://www.uni-ulm.de/fileadmin/website_uni_ulm/nawi.inst.170/publications/2019_Effect_of_Li_and_Mg_on_IL_decomposition.pdf |
| Alternate Webpage(s) | https://doi.org/10.1002/celc.201900371 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
