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Investigation of the cathodic interfacial stability of a nitrile electrolyte and its performance with a high-voltage LiCoO2 cathode

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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.

Graphical abstract: Investigation of the cathodic interfacial stability of a nitrile electrolyte and its performance with a high-voltage LiCoO2 cathode

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Article information


Submitted
03 Jan 2020
Accepted
10 Mar 2020
First published
15 Mar 2020

Chem. Commun., 2020, Advance Article
Article type
Communication

Investigation of the cathodic interfacial stability of a nitrile electrolyte and its performance with a high-voltage LiCoO2 cathode

F. Xian, J. Li, Z. Hu, Q. Zhou, C. Wang, C. Lu, Z. Zhang, S. Dong, C. Mou and G. Cui, Chem. Commun., 2020, Advance Article , DOI: 10.1039/D0CC00049C

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