氟代碳酸乙烯酯用作电解液添加剂的研究  

The Study of Fluoroethylene Carbonate as an Additive of Electrolyte Solution

作　　者：张春丽[1] 叶学海[1] 任春燕[1] 付春明[1] 于晓微[1] 

机构地区：[1]中海油天津化工研究设计院,天津300131

出　　处：《广州化工》2013年第8期91-93,共3页GuangZhou Chemical Industry

摘　　要：在1 mol.L-1LiPF6碳酸乙烯酯(EC)+碳酸二甲酯(DMC)+碳酸甲乙酯(EMC)(EC、DMC、EMC体积比为1∶1∶1)的电解液中加入添加剂氟代碳酸乙烯酯(FEC),用循环伏安(CV)、恒流充放电、电化学阻抗谱(EIS)等方法,研究了FEC对电解液的电化学窗口、LiNi0.5Mn1.5O4/Li和Li/MCMB半电池的性能影响。结果表明,在电解液中添加10%的FEC,可以拓宽电解液的电化学窗口,能在MCMB表面形成稳定的固体电解质相界面(SEI)膜,在室温1 C倍率下,LiNi0.5Mn1.5O4/Li电池循环50次后容量保持率能达到97.31%。Fluoroethylene carbonate （FEC） with a volume ration of 10% was added to the electrolyte containing 1 mol L - 1 LiPF6 in ethylene carbonate （ EC ）, dimethyl carbonate （ DMC ）, and methyl ethyl carbonate （ EMC ） （ 1 ： 1 ： 1 by volume）. The effects of FEC on electrochemical windows, LiNi0.5Mn1.5O4/Li and Li/MCMB lithium ion battery were researched by cyclic voltammetry （CV）, charge -discharge cycle performance, and electrochemical impedance spectra （EIS） . The results indicated that the application of a 10% （volume ratio） of FEC improved electrochemical windows of the electrolyte and formed an excellent solid electrolyte interphase （SEI） film on the MCMB electrode. The discharge capacity of LiNi0.5Mn1.5O4/Li remained 97.31% after running for 50 cycles at 1 C rate and room temperature.

关 键 词：氟代碳酸乙烯酯 电解液 添加剂 锂离子电池 

分 类 号：TQ152[化学工程—电化学工业]