超级电容器用LiBOB电解质电化学性能的研究  

Research on electrochemical performance of lithium bis(oxalate)borate for supercapacitor

作　　者：刘慧[1] 郑文芝[1] 陈姚[1] 于欣伟[1] 张庆[1] 

机构地区：[1]广州大学化学化工学院,广东广州510006

出　　处：《电子元件与材料》2016年第2期26-30,共5页Electronic Components And Materials

基　　金：广州市高校科研项目(No.1201420606)

摘　　要：以草酸、硼酸及氢氧化锂为原料,通过水相中发生酯化反应和在乙腈中进行中和反应结合的方法合成LiBOB(双草酸硼酸锂)。通过电导率、循环伏安、恒电流充放电、交流阻抗等电化学性能测试方法,探索溶剂组成、LiBOB浓度及商业主流电解质盐Et_4NBF_4添加量对LiBOB电解液电化学性能的影响。以LiBOB电解质盐不同溶剂组成的电解液组装的模拟碳超级电容器,工作电压范围在0~2.7 V,循环伏安曲线出现了类矩形的特征;充放电可逆性及电化学循环稳定性良好。LiBOB-Et_4NBF_4工作电解液的电导率最优可达12.5×10^(–3) S/cm。Oxalic acid, boric acid and lithium hydroxide were used as a raw materials and esterification reaction in water and neutral reaction in acetonitrile were combined to produce lithium bis（oxalate） borate（LiBOB）. Tests for conductivity, cyclic voltammetry, constant current charge/discharge, AC impedence and other electrochemical performances were made to explore the influences of solvent composition, the concentration of LiBOB, and Et4NBF4, a commercial mainstream electrolyte salt, on the electrochemical performance of LiBOB electrolyte. For the simulated carbon supercapacitor assembled with LiBOB salt electrolyte composed of different solvents, the range of working voltage is 0–2.7 V, and the cyclic voltammetry curve appears as a rectangle; both charge/discharge reversibility and electrochemical cycle stability are good. The results show that the best conductivity of the LiBOB-Et4NBF4 working electrolyte is 12.5×10–3 S/cm.

关 键 词：双草酸硼酸锂 有机电解液 超级电容器 电解质 电化学性能 能量密度 

分 类 号：TM53[电气工程—电器]