TY  - JOUR
AU  - Meister, Paul
AU  - Küpers, Verena
AU  - Kolek, Martin
AU  - Kasnatscheew, Johannes
AU  - Pohlmann, Sebastian
AU  - Winter, Martin
AU  - Placke, Tobias
TI  - Enabling Mg‐Based Ionic Liquid Electrolytes for Hybrid Dual‐Ion Capacitors
JO  - Batteries & supercaps
VL  - 4
IS  - 3
SN  - 2566-6223
CY  - Weinheim
PB  - Wiley-VCH
M1  - FZJ-2021-02133
SP  - 504 - 512
PY  - 2021
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000597655900001
DO  - DOI:10.1002/batt.202000246
UR  - https://juser.fz-juelich.de/record/892525
ER  -