摘要
设计合成了一种新型有机硅室温离子液体(SiN1IL),并对其化学结构和电化学窗口进行表征,通过与具有高介电常数的丙烯碳酸酯(PC)/低粘度的乙腈(AN)匹配组成电解液,其离子电导率达到商业实际应用的要求(19.6mS·cm-1).对以活性炭(AC)为对称电极的超级电容器的电化学性能测试表明,SiN1IL基电解液与活性炭有很好的界面相容性,其高倍率充放电、阻抗性能优于商用四乙基四氟硼酸铵(Et4NBF4)/PC电解液,在电流密度为1000mA·g-1的条件下,工作电压为2.7V,其比电容为108F·g-1.
A novel room temperature organosilicon ionic liquid (SiN1IL) was synthesized and its chemical structure and electrochemical window were characterized. The ionic conductivity of SiN1IL/propylene carbonate (PC)/acetonitrile (AN) solution was 19.6 mS·cm-1, comparable with the commercial electrolytes currently used in supercapacitors. The electrochemical performance of the cells using activated carbon as electrodes and SiN1IL-based formula with PC/AN as electrolytes was systematically evaluated. SiN1IL/PC electrolyte exhibited superior rate capability and lower impedance compared to a conventional electrolyte (tetraethylammonium tetrafluoroborate (Et4NBF4)/PC). Upon applying a working voltage of 2.7 V, the SiN1IL/PC cell had a specific capacitance of 108 F·g-1 at a current density of 1000 mA·g-1.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2012年第11期2641-2647,共7页
Acta Physico-Chimica Sinica
基金
国家自然科学基金(50973112)
广州市科技计划项目(11A44061500)
中国科学院院地合作项目(2010(8))
中国科学院百人计划项目资助~~
关键词
有机硅
离子液体
超级电容器
电解液
活性炭
Organosilicon
Ionic liquid
Supercapacitor
Electrolyte
Activated carbon