The electrochemical performance of phenolic resin-based activated carbon microbeads II. preparation and electrochemical performance of activated carbon microbeads as the electrode materials of EDLC

Phenolic resin-based activated carbon microbeads were used as the electrode materials for electric double-layer capacitors(EDLC)in an aqueous electrolyte.The electrochemical behavior of the EDLC was investigated by the constant current cycling method.It was found that activated carbon microbeads with high specific capacitance could be prepared by steam activation at 800 ℃ for 1h using an activating agent containing 40 % volume of steam.The obtained activated carbon microbeads had a specific capacitance of 143 F/g, and had excellent charge-discharge properties with a cycling efficiency up to 98 %.Mesopores of 2-7.5 nm had a remarkable influence on specific capacitance.