Preparation of Porous Carbon by Copolymerization for Electric Double-layer Capacitors

doi:10.3724/SP.J.1077.2013.12234

Abstract

Abstract: Porous carbons were prepared by chemical blending using phenolic resin (PF) and epoxy-terminated prepolymer (QS) as carbon precursor and thermally decomposable polymer, respectively. Chemical reaction of PF with QS was manifested by FT-IR spectra and a higher decomposition temperature of QS in TG curves. In the curing reaction, epoxy groups of QS reacts with the phenolic hydroxyl of PF to form ether linkage. The influences of the content of QS on specific surface area, pore structure and electrochemical performance were investigated. As the content of QS increases, the specific surface area, total pore volume and micropore volume increases firstly and then decreases, reaching the maximum value of 609.0 m²/g, 0.28 cm³/g and 0.22 cm³/g, respectively when w(QS)/w(PF)=15%. The performances of prepared samples are better than that of porous carbon prepared by polymer blend method at the same condition. When the porous carbon used as the electrodes in electric double layer capacitor (EDLC), a satisfied speci?c capacitance of 177.5 F/g in 30wt% KOH aqueous electrolytes is acquired and the capacitance maintenance achieves 78% when the current density increases to 20 mA/cm².

Key words: phenolic resin, epoxy-terminated prepolymer, chemical blending, porous carbon, electrochemical performance

CLC Number:

Q657

SUN Li-Hong, LIU Hong-Bo, XIA Xiao-Hong, HE Yue-De. Preparation of Porous Carbon by Copolymerization for Electric Double-layer Capacitors[J]. Journal of Inorganic Materials, 2013, 28(3): 267-272.

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