新型锂离子电池电解质添加剂-亚硫酸甘油酯的合成及其性能研究  

Synthesis and properties of glyceryl sulfite as novel electrolyte additives for lithium-ion batteries

作　　者：安佳钰 刘靖 孙冬兰[1] 孔德茹 霍政春 AN Jiayu;LIU Jing;SUN Donglan;KONG Deru;HUO Zhengchun(College of Science,Tianjin University of Science&Technology,Tianjin 300457,China;College of Chemical Engineering and Materials Science,Tianjin University ofScience&Technology,Tianjin 300457,China;College of Biotechnology,Tianjin University of Science&Technology,Tianjin 300457,China)

机构地区：[1]天津科技大学理学院,天津300457 [2]天津科技大学化工与材料学院,天津300457 [3]天津科技大学生物工程学院,天津300457

出　　处：《功能材料》2023年第4期4166-4175,共10页Journal of Functional Materials

基　　金：国家自然科学基金(21373150);国家基础专项(2016IM030400)。

摘　　要：设计并合成了两种亚硫酸甘油酯衍生物:(1,2-环亚硫酸甘油酯)苯磺酸酯(ODMB)和(1,2-环亚硫酸甘油酯)对甲苯磺酸酯(ODMM),通过库伦效率、恒流充放电,交流阻抗和扫描电子显微镜等测试研究了其作为电解质添加剂对LiCoO2/Li电池电化学性能的影响。结果表明,ODMB和ODMM均具有良好的热稳定性,分解温度分别为256和255℃。掺杂0.7%(质量分数) ODMB的电池放电容量为147.98 mAh·g^(-1),在50次循环后仍保持其初始放电容量(151.76 mAh·g^(-1))的97.51%。与空白电解液相比,添加了ODMB和ODMM的电解液的电极表面具有更致密和稳定的膜结构,显著降低了电极的电荷转移阻抗。浸润性测量结果表明,0.7%(质量分数) ODMB电解液比空白电解液具有更好的浸润性,可以有效改善电池的组装过程。We synthesized two new sulfite-type compounds as the electrolyte additive:(2-oxido-1,3,2-dioxathiolan-4-yl)methyl benzene sulfonate(ODMB)and(2-oxido-1,3,2-dioxathiolan-4-yl)methyl 4-methyl benzene sulfonate(ODMM).The cells’electrochemical performances are characterized by C-rate test,charge-discharge test,electrochemical impedance spectroscopy(EIS).TG-FTIR measurements indicate that ODMB and ODMM both have good thermal stability and their decomposition temperature is 256℃and 255℃,respectively.The cell with 0.7 wt%ODMB discharge capacity(147.98 mAh/g)remain at 97.51%of its initial discharge capacity(151.76 mAh/g)after 50 cycles.Scanning electron microscope(SEM)results demonstrate that a denser and stable layer is observed.Moreover,the charge transfer impedance of the electrodes significantly decreases.And wettability measurement shows that the 0.7 wt%ODMB electrolyte exhibits superior wettability than the blank electrolyte,which can effectively ameliorate the cells assembly process.

关 键 词：电解质添加剂 热稳定性 固体电解质界面 浸润性 

分 类 号：O646[理学—物理化学]