Polypyrrole-Derived Activated Carbons for High-Performance Electrical Double-Layer Capacitors with Ionic Liquid Electrolyte
Polypyrrole-Derived Activated Carbons for High-Performance Electrical Double-Layer Capacitors with Ionic Liquid Electrolyte
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DOI：
10.1002/adfm.201101866
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发表时间：
2012-02-22
影响因子：
19
通讯作者：
Yushin, Gleb
中科院分区：
文献类型：
--
作者：
Wei, Lu;Sevilla, Marta;Yushin, Gleb
碳基双电层电容器（EDLC）作为电能的储存和输送装置，在促进节能经济方面受到广泛关注。活性炭（AC）合成的常规方法提供对其表面积和孔隙率的有限控制，这导致基于有机电解质和离子液体（IL）的商业EDLC中的典型比电容为70120 F g-1。此外，由天然前体生产的典型AC遭受其性质的显著变化，这对于EDLC在汽车应用中的使用是不利的。提出了一种AC合成双电层液晶的新方法。该方法基于合成聚合物的直接活化。所提出的程序使我们能够生产AC的比表面积高达3432 m2 g-1和体积的0.54 nm孔高达2.39 cm 3 g-1。将制备的炭应用于基于离子液体电解质的双电层电容器中，比电容接近300 F g-1，这在炭材料中是前所未有的，并且在10 A g-1的非常高的电流密度下经过10 000次充放电循环后，性能提高了58%。所生产的材料的显着特性和所制造的EDLC在高温下在宽电化学窗口中安全操作的能力表明，所提出的合成路线为EDLC在电动汽车和工业应用中的大规模材料生产提供了极好的潜力。
As electrical energy storage and delivery devices, carbon-based electrical double-layer capacitors (EDLCs) have attracted much attention for advancing the energy-efficient economy. Conventional methods for activated carbon (AC) synthesis offer limited control of their surface area and porosity, which results in a typical specific capacitance of 70120 F g-1 in commercial EDLCs based on organic electrolytes and ionic liquids (ILs). Additionally, typical ACs produced from natural precursors suffer from the significant variation of their properties, which is detrimental for EDLC use in automotive applications. A novel method for AC synthesis for EDLCs is proposed. This method is based on direct activation of synthetic polymers. The proposed procedure allowed us to produce ACs with ultrahigh specific surface area of up to 3432 m2 g-1 and volume of 0.54 nm pores up to 2.39 cm3 g-1. The application of the produced carbons in EDLCs based on IL electrolyte showed specific capacitance approaching 300 F g-1, which is unprecedented for carbon materials, and 58% performance improvement after 10 000 chargedischarge cycles at the very high current density of 10 A g-1. The remarkable characteristics of the produced materials and the capability of the fabricated EDLCs to operate safely in a wide electrochemical window at elevated temperatures, suggest that the proposed synthesis route offers excellent potential for large-scale material production for EDLC use in electric vehicles and industrial applications.