改性活性炭双电层电容器电极材料研究  

Modification of Activated Carbon as Electrode Material for Electric Double-layer Capacitor

作　　者：胡中华[1] 万翔[1] 刘亚菲[1] 赵国华[1] 

机构地区：[1]同济大学化学系,上海200092

出　　处：《电子元件与材料》2006年第8期11-15,共5页Electronic Components And Materials

基　　金：国家自然科学基金资助项目(50472089)

摘　　要：用氢氧化钾对普通活性炭活化改性,比表面积和总孔容由806m2/g和0.411cm3/g分别增加到1168m2/g和0.577cm3/g。用该材料制成硬币型双电层电容器,经测定炭材料比电容高达203.5F/g,提高了64%;等效串联内阻仅为1.94?,大电流放电时容量衰减小于10%。其突出优点是体积与面积比电容高达109.6F/cm3和17.4×10–6F/cm2。研究发现孔径分布于1.4～2.78nm的超微孔和小中孔,有利于电解质离子形成双电层而提高炭材料的电容量。Conventional activated carbon as electrode material was post-treated by KOH activation for electric double-layer capacitor （EDLC）. The specific surface area and pore volume of treated carbon increased from 806 m^2/g and 0.411 cm^3/g to 1168 m^2/g and 0.577 cm^3/g, respectively. The resultant EDLC of coin type has high specific capacitance of 203.5 F/g, 64% higher than that of original carbon-based EDLC, low average equivalent series resistance （ESR） of 1,94Ω. Its capacitance lost less than 10% under high current density discharge. It is worthy to note that the corresponding volumetric and surface capacity are as high as 109.6 F/cm^3 and 17.4×10-6 F/cm^2, respectively. Besides, it was found that pore size in the range of 1.4-2.78 nm is favorable to form electric double layer, resulting in an increase in capacitance.

关 键 词：电子技术 双电层电容器 活性炭 电极 比电容 KOH-活化 

分 类 号：TM53[电气工程—电器]