Abstract
The effects of fluoroethylene carbonate (FEC) as co-solvent on the electrochemical performance of high voltage cathode material Li2CoPO4F are investigated. Compared with traditional carbonate based electrolyte (1 mol·L-1 LiPF6 EC/DMC (1:1, m:m)), the FEC/DMC based electrolyte can significantly improved the electrochemical performance of Li2CoPO4F. After 100 cycles between 3V and 5.4 V at 1 C rate, the capacity retention of Li2CoPO4F electrode in 1 mol·L-1 LiPF6 EC/DMC (1:1, m:m) was 52.6 % , while that in the EC/DMC based electrolyte was only 14.5 %. Possible functional mechanisms of FEC improving the electrochemical performance of Li2CoPO4F were studied by LSV, EIS, SEM and XPS measurements. It was shown that compared with the traditional EC/DMC based electrolyte, the FEC/DMC based electrolyte exhibited higher stability at high voltage, which suppressed the side reactions at electrode/electrolyte interface when charged to high voltage, and improved the structure stability of Li2CoPO4F during cycling, thus, significantly enhanced the electrochemical performance of Li2CoPO4F.
Graphical Abstract
Keywords
lithium ion battery, high voltage electrolytes; fluoroethylene carbonate; Li2CoPO4F
Publication Date
2018-06-28
Online Available Date
2017-06-09
Revised Date
2017-06-06
Received Date
2017-05-11
Recommended Citation
Zhi-gang WANG, Wei-min ZHAO, Hong-chun WANG, Min LIN, Zheng-liang GONG, Yong YANG.
Influences of FEC-based Electrolyte on Electrochemical Performance of High Voltage Cathode Material Li2CoPO4F[J]. Journal of Electrochemistry,
2018
,
24(3): 216-226.
DOI: 10.13208/j.electrochem.170509
Available at:
https://jelectrochem.xmu.edu.cn/journal/vol24/iss3/3
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