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Preparation and Modification of Carbon Aerogel as Supercapacitor Electrode Material

Author: ZhengXiaoLing
Tutor: WangJinFu
School: Harbin Institute of Technology
Course: Chemical Engineering and Technology
Keywords: Carbon airgel Organic polymer Supercapacitor Specific capacity
CLC: TM53
Type: Master's thesis
Year: 2010
Downloads: 87
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Abstract


Supercapacitor is a new type of energy storage device between traditional static container and secondary battery, has a wide range of applications in the defense and civilian areas. The electrode is the decision of of Supercapacitors the main factors, high-performance electrode materials is of great significance. The purpose of this topic is the preparation of a high-performance carbon the airgel electrode material and applied to the super-capacitor. The organic airgel precursor functional group characteristics studied by infrared, scanning electron microscopy to study the morphology of the carbon airgel, 6mol / L KOH electrolyte cyclic voltammetry, charge-discharge test carbon gas cycle charge-discharge performance such as stability, internal resistance than the capacity of the gel electrode material. This thesis the following aspects: resorcinol and formaldehyde as raw materials in alkaline hydroxide catalyzed by the sol - gel method often pressure drying, charring the preparation of carbon aerogels. Explore the catalyst type, dosage and preparation by means of carbon airgel structure and electrochemical performance. The results show that: the catalyst species and the change in concentration, caused by changes in pH of the reaction system. As the reaction system pH decreases, carbon airgel morphology by massive transition to spherical, the specific capacitance of carbon airgel first increases and then decreases. Mg (OH) 2 catalyst, R / C (molar ratio of resorcinol and catalyst) is larger than the capacity of 5087 when the preparation of carbon aerogels in 10mA discharge capacity of 119.4F / g; Al (OH) 3 as a catalyst, R / C than the capacity of carbon airgel prepared at 2.69 × 109 10mA discharge capacity 129.2F / g; Ca (OH) < sub> 2 as a catalyst, R / C is larger than the capacity of carbon airgel prepared 74 specific discharge capacity at 10mA to 132.9F / g; NaOH as catalyst, R / C 1000 Preparation larger than the capacity of the carbon airgel at 10mA discharge capacity to 124.1F / g. Carbon aerogels prepared cycle life test results for the electrodes of the capacitor: the material at 10mA constant current charge and discharge 500 times, than the capacity retention rate, good cycle performance. In order to improve the specific capacity of the electrode material, the carbon airgel modified. The introduction of the organic polymer and inorganic metal salts in the preparation process, the study add type and dosage of the morphology, structure and performance of carbon airgel. The results show that: the introduction of additives, with the increase of the added amount of carbon airgel than capacity increased and then decreased, adding 0.5%. Add the same amount, add F127 carbon aerogels prepared than the capacity greater than the add Span80, prepared by polyethylene glycol. Add 0.5? 27 carbon aerogels prepared to 146.7F / g in the discharge capacity of 10mA, 50mA discharge than the capacity to 137.0F / g. The cycle life test showed that the samples have good cycling performance. The introduction of metal salt, with the R / T (resorcinol with a metal salt in molar ratio) increases, the specific capacity of the carbon airgel is also increased. R / T is the same, the introduction of Mn (AC) 2 carbon aerogels prepared capacity greater than introducing Ni (AC) 2 and Co (AC) 2 was prepared. Mn (AC) 2, R / T for carbon aerogels prepared 100 discharge capacity of 10mA to 140.8F / g, 50mA discharge than capacity for 125.6F / g. The cycle life test showed that the samples have good cycling performance.

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CLC: > Industrial Technology > Electrotechnical > Electrical > Capacitor
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