Welcome to Visit Journal of Electrochemistry,Today is Share:

Journal of Electrochemistry ›› 2018, Vol. 24 ›› Issue (3): 216-226.doi: 10.13208/j.electrochem.170509

• Articles • Previous Articles     Next Articles

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

WANG Zhi-gang1, ZHAO Wei-min1, WANG Hong-chun1, LIN Min1, GONG Zheng-liang1*, YANG Yong1,2*   

  1. 1.College of Energy,Xiamen University,Xiamen 361005,Fujian,China;2. State Key Lab of Physical Chemistry of Solid Surfaces,and College of Chemistry & Chemical Engineering,Xiamen University,Xiamen 361005,Fujian,China
  • Received:2017-05-11 Revised:2017-06-06 Online:2018-06-28 Published:2017-06-09
  • Contact: GONG Zheng-liang, YANG Yong E-mail:zlgong@xmu.edu.cn, yyang@xmu.edu.cn


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: