Journal
CHEMICAL COMMUNICATIONS
Volume 56, Issue 37, Pages 4998-5001Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0cc00049c
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Funding
- National Key R&D Program of China [2018YFB0104300]
- National Natural Science Foundation for Distinguished Young Scholars of China [51625204]
- National Natural Science Foundation of China [51703236]
- Key Research and Development Plan of Shandong Province P. R. China [2018GGX104016]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA22010603]
- NSFC-Shandong Joint Fund [U1706229]
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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.
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