This title appears in the Scientific Report :
2021
Please use the identifier:
http://hdl.handle.net/2128/27784 in citations.
Please use the identifier: http://dx.doi.org/10.1002/batt.202000246 in citations.
Enabling Mg‐Based Ionic Liquid Electrolytes for Hybrid Dual‐Ion Capacitors
Enabling Mg‐Based Ionic Liquid Electrolytes for Hybrid Dual‐Ion Capacitors
We report on the reversible (de)intercalation of TFSI− anions from a Mg‐based ionic liquid electrolyte, Mg(TFSI)2 in Pyr14TFSI, in graphite urn:x-wiley:25666223:media:batt202000246:batt202000246-math-0001 activated carbon hybrid dual‐ion capacitor (DIC) cells. The role of different pseudo reference...
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Personal Name(s): | Meister, Paul |
---|---|
Küpers, Verena / Kolek, Martin / Kasnatscheew, Johannes / Pohlmann, Sebastian / Winter, Martin (Corresponding author) / Placke, Tobias (Corresponding author) | |
Contributing Institute: |
Helmholtz-Institut Münster Ionenleiter für Energiespeicher; IEK-12 |
Published in: | Batteries & supercaps, 4 (2021) 3, S. 504 - 512 |
Imprint: |
Weinheim
Wiley-VCH
2021
|
DOI: |
10.1002/batt.202000246 |
Document Type: |
Journal Article |
Research Program: |
Elektrochemische Energiespeicherung |
Link: |
OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1002/batt.202000246 in citations.
We report on the reversible (de)intercalation of TFSI− anions from a Mg‐based ionic liquid electrolyte, Mg(TFSI)2 in Pyr14TFSI, in graphite urn:x-wiley:25666223:media:batt202000246:batt202000246-math-0001 activated carbon hybrid dual‐ion capacitor (DIC) cells. The role of different pseudo reference electrodes (PREs) including Ag‐wire and Li metal is discussed regarding the comparability of different battery cells. We show that an Ag‐wire PRE is not suitable for the designated purpose, while the use of a Li metal PRE results in high reproducibility. Mg‐based DIC cells are compared with cells based on pure Pyr14TFSI and LiTFSI‐Pyr14TFSI electrolytes, and with graphite urn:x-wiley:25666223:media:batt202000246:batt202000246-math-0002 Li metal dual‐ion cells employing LiTFSI‐Pyr14TFSI. At 5.2 V vs. Li|Li+, Mg‐containing DIC cells reveal an improved performance compared to Li‐based cells, i. e., higher capacity (87 vs. 85 mAh g−1) and higher Coulombic efficiency (98 vs. 96 %). These results may pave the way to further studies and performance improvements of Mg‐based batteries and to hybrid DIC chemistries with other cations, especially multi‐valent ones. |