講者：鄧熙聖教授
演講題目：Electrolyte and Electrode Design for Electric Double Layer Capacitors
演講時間：12/16（五）15:30~17:20
演講地點：博雅館 201
主持人：徐治平教授
Electrolyte and Electrode Design for Electric Double Layer Capacitors
Hsisheng Teng (鄧熙聖)
Department of Chemical Engineering, National Cheng Kung University, Tainan 70101, Taiwan
Abstract
We analyze the high-voltage charge-storage behavior of electric double layer capacitors (EDLCs) in which two ionic liquid (IL) electrolytes are used, and are operated at 3.5 and 4.1 V, respectively. Symmetric two-electrode capacitor cells assembled using micropore-rich activated mesophase pitch (aMP) and activated carbon fiber carbons show a standard capacitive behavior in cyclic voltammetry analysis, whereas cells featuring templated mesoporous carbon show ion-intercalating peaks in high-voltage scans. The aMP carbon, which contains hierarchically connected micropores and mesopores, is effective in storing charge at a high rate at high voltages. Our study also demonstrates the synthesis of a dicationic ionic liquid comprising two ethylimidazolium cations linked by an ether-bridged linker and paired with two bis(trifluoromethanesulfonyl)imide anions (i.e., [C6O2(MIm)2]-TFSI2), which is introduced into 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (i.e., EMIm-TFSI) to form an electrolyte for EDLCs operated in a wide temperature range (from -20 to 60 °C). Finally, we fabricate all-solid-state microsupercapacitors using a laser for the micromachining of substrates coated with aMP to produce in-plane interdigitated microelectrodes for use in conjunction with gel-state electrolytes. The proposed fabrication methods enable the on-chip integration of microelectronic devices.
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