碳酸甘油酯衍生物用于电解液添加剂的研究

Study on performance of derivatives of glycerol carbonate as electrolyte additives

研究了双(2,3-环碳酸甘油酯)草酸酯和双(2,3-环碳酸甘油酯)丁二酸酯作为电解液添加剂对锂离子电池性能的影响。通过恒流充放电测试、交流阻抗(EIS)、扫描电镜(SEM)、循环伏安(CV)对含不同电解液电池的电化学性能进行表征。结果表明:与空白电解液相比,含添加剂电解液在石墨电极表面形成稳定的保护性SEI膜;而且可以抑制电解液持续分解;循环二十周后,电池阻抗增加变小;由于电极-电解液界面的优化,含添加剂的电池表现出优越的循环稳定性。

To improve the performance of the battery, oxalic acid bis-（2-oxo-[1,3]dioxolan-4-ylmethyl） ester and succinic acid bis- （2-oxo- [1,3]dioxolan-4-ylmethyl） ester were introduced as electrolyte additives. The electrochemical properties of the electrolytes with additives were investigated by charge-discharge test, electrochemical impedance spectroscopy （EIS）, scanning electron microscopy （SEM） and cyclic voltammetry （CV）. The results show that compared with the blank electrolyte, the electrolytes with additives form a stable protective SEI film on the surface of graphite electrode; the additives inhibit the continuous decomposition of the electrolyte; the change of the impedance of the additive-containing cells after 20 cycles becomes small; due to the optimized electrode-electrolyte interface, the additive-containing cells have superior cycle stability.