Structural evolution of carbon aerogel microspheres by thermal treatment for high-power supercapacitors

• 来源期刊: 能源化学
• 年，卷（期）: 2018,（2）
• 页码范围: 439-446
• 页数: 8页
• 语种: 英文

摘要

In this work,a series of carbon aerogel microspheres (CAMs) with tailored pore structures were successfully prepared via a sol-gel method and subsequent heat-treatment at various temperatures from 600 to 1600 ℃.The effects of heat-treatment temperature (HTT) on the CAM microstructure were systematically investigated by physical and chemical characterization.The electrical conductivity increased by up to 250 S/cm and mesopores with high electrolyte accessibility developed in the CAM with increasing HTT.However,the specific surface area (SSA) decreased for HFTs from 1000 to 1600 ℃.The results show that these two factors should be finely balanced for further applications in high power supercapacitors.The CAMs carbonized at 1000 ℃ had the highest SSA (1454 m2/g),large mesoporous content (20％) and favorable conductivity (71 S/cm).They delivered a high energy density of 38.4Wh/kg at a power density of 0.17 kW/kg.They retained an energy density of 25.5 Wh/kg even at a high power density of 10.2 kW/kg,and a good rate capability of 84％ after 10,000 cycles.This performance is superior to,or at least comparable to,those of most reported carbon materials.