| Summary: | 碩士 === 逢甲大學 === 材料科學所 === 90 === The PAN-based activated carbon fiber cloth was provided by Taiwan Carbon Co. Ltd.. The relation between activated carbon fibers and performance with electric double-layer capacitors was studied.
The crystalline structure of activated carbon fibers are turbostratic structure by XRD analysis and Raman spectropy. In CV test, PAN 1600 and PAN1800 still have capacitance behavior at high speed scan rate (100 mV/s), but PAN 1050 and PAN1200 must slow down scan rate. The specific capacitance is not dependent on specific area. In CA test, The peak current of PAN1600 and PAN1800 are higher due to low resistivity. In CA test was use small discharged current, PAN1050 and PAN1200 have higher surface oxygen amount and also have higher capacitance. In Impedance test, activated carbon fibers with low resistivity have the ability of fast charge-discharge rate.
Ideal electric double-layer capacitor must consider to both capacitance and charge-discharge rate. Electric double-layer capacitors divide to energy-type and power-type in real application. The experiment is concluded then PAN1600 and PAN1800 is more suitable for power-type design, but PAN1050 and PAN1200 is more suitable for energy-type.
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