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Investigation of the cathodic interfacial stability of a nitrile electrolyte and its performance with a high-voltage LiCoO 2 cathode.
- Source :
-
Chemical communications (Cambridge, England) [Chem Commun (Camb)] 2020 May 07; Vol. 56 (37), pp. 4998-5001. - Publication Year :
- 2020
-
Abstract
- The limited discharge capacity of LiCoO2 can be improved by increasing its working potential, but it suffers from Co4+ dissolution and decomposition of the electrolyte. Nitriles have attracted great interest as high-voltage electrolytes due to their wide electrochemical window. However, the cathodic interfacial stability of nitrile electrolytes with a high-voltage LiCoO2 cathode has yet to be explored. Herein, we adopted an SN-based deep eutectic electrolyte with SN as the only solvent and found that Co4+ could be reduced by the SN solvent on the interface of the LiCoO2 electrode, causing a reverse phase change of LiCoO2 and severe self-discharge of the LiCoO2|Li and LiCoO2|Li4Ti5O12 batteries. When LiDFOB was introduced into the electrolyte, the self-discharge behavior of cells could be largely decelerated. The series of characterizations performed in our work revealed that the cathode/electrolyte interface generated from the LiDFOB salt could stabilize the interface of LiCoO2 and suppress the dissolution of the ions of the transition metal Co.
Details
- Language :
- English
- ISSN :
- 1364-548X
- Volume :
- 56
- Issue :
- 37
- Database :
- MEDLINE
- Journal :
- Chemical communications (Cambridge, England)
- Publication Type :
- Academic Journal
- Accession number :
- 32239070
- Full Text :
- https://doi.org/10.1039/d0cc00049c