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Morphological Evolution and Solid-Electrolyte Interphase Formation on LiNi 0.6 Mn 0.2 Co 0.2 O 2 Cathodes Using Highly Concentrated Ionic Liquid Electrolytes.
- Source :
-
ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2022 Mar 23; Vol. 14 (11), pp. 13196-13205. Date of Electronic Publication: 2022 Mar 11. - Publication Year :
- 2022
-
Abstract
- Employing high-voltage Ni-rich cathodes in Li metal batteries (LMBs) requires stabilization of the electrode/electrolyte interfaces at both electrodes. A stable solid-electrolyte interphase (SEI) and suppression of active material pulverization remain the greatest challenges to achieving efficient long-term cycling. Herein, studies of NMC622 (1 mAh cm <superscript>-2</superscript> ) cathodes were performed using highly concentrated N -methyl- N -propylpyrrolidinium bis(fluorosulfonyl)imide (C <subscript>3</subscript> mpyrFSI) 50 mol % lithium bis(fluorosulfonyl)imide (LiFSI) ionic liquid electrolyte (ILE). The resulting SEI formed at the cathode enabled promising cycling performance (98.13% capacity retention after 100 cycles), and a low degree of ion mixing and lattice expansion was observed, even at an elevated temperature of 50 °C. Fitting of acquired impedance spectra indicated that the SEI resistivity ( R <subscript>SEI</subscript> ) had a low and stable contribution to the internal resistivity of the system, whereas active material pulverization and secondary grain isolation significantly increased the charge transfer resistance ( R <subscript>CT</subscript> ) throughout cycling.
Details
- Language :
- English
- ISSN :
- 1944-8252
- Volume :
- 14
- Issue :
- 11
- Database :
- MEDLINE
- Journal :
- ACS applied materials & interfaces
- Publication Type :
- Academic Journal
- Accession number :
- 35274926
- Full Text :
- https://doi.org/10.1021/acsami.1c21853