Influences of FEC-based Electrolyte on Electrochemical Performance of High Voltage Cathode Material Li2CoPO4F

doi:10.13208/j.electrochem.170509

Abstract

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.

Key words: lithium ion battery, high voltage electrolytes; fluoroethylene carbonate; Li₂CoPO₄F

CLC Number:

O646

WANG Zhi-gang, ZHAO Wei-min, WANG Hong-chun, LIN Min, GONG Zheng-liang, YANG Yong. Influences of FEC-based Electrolyte on Electrochemical Performance of High Voltage Cathode Material Li₂CoPO₄F[J]. Journal of Electrochemistry, 2018, 24(3): 216-226.

References

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Influences of FEC-based Electrolyte on Electrochemical Performance of High Voltage Cathode Material Li₂CoPO₄F

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