TY  - JOUR
AU  - Wichmann, Lennart
AU  - Brinkmann, Jan-Paul
AU  - Luo, Mingzeng
AU  - Yang, Yong
AU  - Winter, Martin
AU  - Schmuch, Richard
AU  - Placke, Tobias
AU  - Gomez-Martin, Aurora
TI  - Improved Capacity Retention for a Disordered Rocksalt Cathode via Solvate Ionic Liquid Electrolytes
JO  - Batteries & supercaps
VL  - 5
IS  - 7
SN  - 2566-6223
CY  - Weinheim
PB  - Wiley-VCH
M1  - FZJ-2022-02027
SP  - e202200075
PY  - 2022
AB  - Lithium-rich disordered rocksalts (DRX) are a promising class of cathode materials for high-energy lithium ion batteries (LIBs) and lithium metal batteries (LMBs) due to the high initial specific capacities (>200 mAh g−1) as well as flexible chemical composition. However, challenges concerning severe capacity fade and voltage decay upon cycling at high cut-off voltages are still to be overcome. Moreover, state-of-the-art carbonate-based electrolytes can be decomposed by reactive oxygen species released by DRX materials during cycling. In this work, the electrochemical performance of Li1.25Fe0.5Nb0.25O2 (LFNO) || Li LMB and LFNO || graphite LIB cells is compared for a conventional, carbonate-based electrolyte and the solvate ionic liquid (SIL) [Li(G3)][TFSI] (G3: triethyleneglycoldimethylether). Cycle life is notably improved by the chemically more stable ionic liquid electrolyte, as the anionic redox activity of LFNO is prolonged compared to the carbonate-based cells. This work represents an important step toward an improved cycle life of DRX cathodes.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000787102500001
DO  - DOI:10.1002/batt.202200075
UR  - https://juser.fz-juelich.de/record/907419
ER  -