双电层电容器用中孔炭微球/活性炭复合电极的制备(英文)

Preparation of mesoporous carbon microsphere/activated carbon composite for electric double-layer capacitors

采用水热法合成比表面积1 850m2/g、粒径1μm的中孔炭微球(MCM);而后将所制MCM加入比表面积为3 200m2/g的超级活性炭(HSAC)中制成用于双电层电容器的复合电极材料,并研究了该复合电极材料的电化学性能。结果表明:在比表面积为3 200m2/g的HSAC中添加质量分数20%的MCM后,其颗粒接触内阻、离子扩散内阻明显降低;在6m o l/L的KOH电解液体系中,在12A/g的电流密度下,其比电容仍能稳定在230F/g。而在同样的条件下,纯HSAC和纯MCM的比电容仅分别为190F/g和148F/g。复合电极在大电流下电化学性能的提高应归因于MCM合适的粒径、中孔结构及其较高的比表面积。

Mesoporous carbon microspheres（MCMs） with specific surface area and diameter of 1 850 m2/g and 1 μm,respectively,were synthesized using the solvothermal method.When mass fraction 20% of these were added to a high surface area-activated carbon（HSAC： 3 200 m2/g） its interfacial resistance and ion diffusion resistance decreased significantly.The specific capacitance of the composite electrode is 230 F/g in 6 mol/L KOH electrolyte,whereas those of pure HSAC and MCMs are only 190 and 148 F/g,respectively,at a high current density of 12 A/g.The improvement in electrochemical performance of the HSAC electrode at high current densities is attributed to the small particle diameter,mesoporous structure and high specific surface area of the added MCMs.