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Studies on Supercapacitor Electrode Materials of MnO2

Author: FengYangLiu
Tutor: JingXiaoYan
School: Harbin Engineering University
Course: Applied Chemistry
Keywords: Supercapacitor Nano- manganese dioxide Composites Modified
CLC: TM53
Type: Master's thesis
Year: 2005
Downloads: 556
Quote: 2
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Abstract


Super capacitor energy storage element is an emerging, because of its high specific energy, good reversibility and long cycle life, at home and abroad in recent years, the application of supercapacitors research is very active. The use of super-capacitors and a battery hybrid system can well meet the high power density output of electric vehicles occasions. From the point of view than the power, the super capacitor can be used in parallel with the secondary battery to compensate for the low battery power performance than the defect; the specific energy, the secondary batteries and super capacitors can compensate for the lack of lower specific energy. Supercapacitors most attention is its potential applications used in electric vehicles, electric vehicles can meet at startup, acceleration, climbing high power and high current performance requirements in order to protect the secondary battery. In addition, it can be a fuel cell starting power, mobile communications and computer power support. Therefore, to carry out Supercapacitors great significance. In this paper, prepared by the solid-liquid phase synthesis of manganese dioxide supercapacitor electrode material, and its a modified electrolyte select a series of studies. By X-ray diffraction (XRD), transmission electron microscopy (TEM) and other means to structure and morphology of the samples were analyzed by cyclic voltammetry and galvanostatic charge-discharge test means electrochemical properties of the samples tested. Using the liquid phase synthesis method, respectively, the potassium chloride and manganese chloride, manganese sulfate, manganese nitrate, manganese acetate and fibrous reaction of the nano-MnO 2 , which showed that the manganese sulfate precursor was prepared as The MnO 2 has better capacity and higher than the electrochemical properties, calcination can improve liquid prepared MnO 2 electrode charge-discharge performance and specific capacity , before calcination and its specific capacity 86.7F · g -1 , calcination can be achieved after 110.0F · g -1 . Use between potassium permanganate and manganese chloride was prepared by solid-phase synthesis of nano manganese dioxides whiskers. A length of about 300 ~ 500nm, a diameter of about 5 ~ 10nm. By XRD pattern shows that α-MnO 2 and γ-MnO 2 mixed crystal phase. Comparison shows that the liquid phase method than manganese dioxide prepared with a higher capacity and better than the electrochemical performance. The effects of scanning speed on the specific capacity of the electrode, the results show that increasing the scan rate, the specific capacitance decreases. By cyclic voltammetry and galvanostatic charge-discharge test methods investigated manganese dioxide electrode in different concentrations of ammonium sulfate electrolyte capacitor performance, results showed that manganese dioxide electrode in 2.0mol · L -1 of (NH 4 ) 2 SO 4 liquid electrolyte can show good super capacitor characteristics, and its specific capacity of up to 183.7F · g -1 . Using mechanical mixing composite ultrafine powders prepared nano / micro composite MnO 2 , in order to

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CLC: > Industrial Technology > Electrotechnical > Electrical > Capacitor
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