环亚硫酸甘油酯衍生物作为电解液添加剂对锂离子电池电化学性能的影响  

Effect of Derivatives of Glycerol Sulfite as Electrolyte Additive on Electrochemical Performance of Lithium Ion Battery

作　　者：艾淑娟 宗成星 吴为 冯京京 金灿 付凤至 刘靖 孙冬兰[2] 郑琴 郭也平 AI Shujuan;ZONG Chengxing;WU Wei;FENG Jingjing;JIN Can;FU Fengzhi;LIU Jing;SUN Donglan;ZHENG Qin;GUO Yeping(College of Chemical Engineering and Material Science, Tianjin University of Science and Technology,Tianjin 300457,China;College of Science,Tianjin University of Science and Technology,Tianjin 300457,China;Hangzhou Future Power Technology Co.,Ltd,Hangzhou 311402,China)

机构地区：[1]天津科技大学化工与材料学院,天津300457 [2]天津科技大学理学院,天津300457 [3]杭州金色能源科技有限公司,杭州311402

出　　处：《高等学校化学学报》2018年第11期2520-2528,共9页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:21373150)资助~~

摘　　要：在亚硫酸酯基团的基础上引入苯环,设计并合成了3种环亚硫酸甘油酯衍生物[双(1,2-环亚硫酸甘油酯)对苯二甲酸酯、三(1,2-环亚硫酸甘油酯)均苯三甲酸酯和四(1,2-环亚硫酸甘油酯)均苯四甲酸酯],通过倍率充放电、恒流充放电、交流阻抗和扫描电子显微镜等测试研究了这些添加剂对锂离子电池性能的影响.结果表明,与空白电解液相比,加入三(1,2-环亚硫酸甘油酯)均苯三甲酸酯的电解液球化石墨电极表面可形成一层致密而稳定的固体电解质界面(SEI)膜,从而优化电极-电解液的界面性能,改善电池的倍率性能和循环性能,且在循环80周后电池阻抗增加较小;而双(1,2-环亚硫酸甘油酯)对苯二甲酸酯和四(1,2-环亚硫酸甘油酯)均苯四甲酸酯的加入不会明显改善电池的循环性能.研究结果表明苯环上亚硫酸甘油酯基团的数目对其性能影响较大.Three compounds,bis-[(2-oxido-1,3,2-dioxathiolan-4-yl)methyl]terephthalate(BMTP),tris[(2-oxido-1,3,2-dioxathiolan-4-yl)methyl]benzene-1,3,5-tricarboxylate(TMBT1)and tetrakis[(2-oxido-1,3,2-dioxathiolan-4-yl)methyl]benzene-1,2,4,5-tetracarboxylate(TMBT2),were designed and synthesized.Those compounds were added in lithium ion battery and their effect was thoroughly investigated by rate of charge and discharge test,galvanostatic charge and discharge test,electrochemical impedance spectroscopy(EIS)and scanning electron microscopy(SEM).The results showed that a dense and stable solid electrolyte interface(SEI)layer could be formed on the surface of the spheroidized graphite electrode with TMBT1,improving the electrode-electrolyte interface.And the increase of impedance with TMBT1 as electrolyte additive after 80 cycles was small.The performance test of battery show that the addition of TMBT1 can improve the rate performance and cycle stability of the battery,while the addition of BMTP and TMBT2 did not make the battery performance better.The results also suggest that number of cycle sulfite group on benzene ring has a huge influence on the performance of the lithium ion battery.

关 键 词：电解液添加剂 环亚硫酸甘油酯衍生物 锂离子电池 固体电解质界面膜 

分 类 号：O646[理学—物理化学]