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.
出处
《电子元件与材料》
CAS
CSCD
北大核心
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)
关键词
电子技术
双电层电容器
活性炭
电极
比电容
KOH-活化
electronic technology
electric double-layer capacitors
activated carbon
electrode
specific capacitance
KOH-activation
