有机双电层电容器用活性炭电极的修饰

利用石墨、炭黑、碳纳米管三种导电碳材料,对高比表面积活性炭进行掺杂修饰,制备有机电解液双电层电容器用薄膜电极。经电化学测试发现,在 1 mol/L 的 LiPF6/EC-DEC(体积比 1∶1)溶液中,经不同导电材料修饰后的活性炭电极,其单电极比容量和大电流充放电性能均有较大改善。其中,掺杂 10%(质量分数)碳纳米管的活性炭电极,在 330 mA/g 电流密度下的单电极比容量可达 81 F/g,比未掺杂活性炭电极 60 F/g 的比容量提高了 35%;电流密度从 60 mA/g 增至 330 mA/g,该电极的容量保持率为 79.4%。

Modification of the Activated Carbon Electrode Applied in Organic Electric Double-layer Capacitors

The activated carbon material which had high specific surface was modified with graphite, carbon black and carbon nano-tubes respectively. Then, the adulterant was made into different film electrodes that would be applied in electric double-layer capacitor (EDLC) with organic electrolyte. The electrochemical tests proved that the specific capacitance and high power discharge performance of the activated carbon electrode modified with different carbon electron conducting materials are improved markedly in 1mol/L LiPF6/EC-DEC (volume 1:1) solution. The specific capacitance of the activated carbon electrode adulterated with 10% carbon nano-tubes could be 81F/g, and it had a 35% increase relative to the specific capacitance of pure activated carbon electrode. As the current density increasing from 60 mA/g to 330 mA/g, the capacitance holding of the adulterated electrode could be 79.4%.