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《Journal of Electrochemistry》 2018-03
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Influences of FEC-based Electrolyte on Electrochemical Performance of High Voltage Cathode Material Li_2CoPO_4F

WANG Zhi-gang;ZHAO Wei-min;WANG Hong-chun;LIN Min;GONG Zheng-liang;YANG Yong;College of Energy, Xiamen University;State Key Lab of Physical Chemistry of Solid Surfaces, and College of Chemistry & Chemical Engineering,Xiamen University;  
The effects of fluoroethylene carbonate(FEC) as co-solvent on electrochemical performance of high voltage cathode material Li_2CoPO_4F were investigated. Compared with traditional carbonate based electrolyte(1 mol·L~(-1) LiPF_6EC/DMC(1:1, m:m),the FEC/DMC based electrolyte significantly improved the electrochemical performance of Li_2CoPO_4F. After 100 cycles between 3 V and 5.4 V at 1 C rate, the capacity retention of Li_2CoPO_4F electrode in 1 mol·L~(-1) LiPF_6FEC/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 Li_2CoPO_4F 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 Li_2CoPO_4F during cycling, thus, significantly enhanced the electrochemical performance of Li_2CoPO_4F.
【Fund】: 福建省自然科学基金项目(No.2014J05019);; 国家自然科学基金项目(No.21233004 No.21303147);; 厦门大学校长基金(No.20720150090)资助
【CateGory Index】: TM912
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