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Studies On Electrochemical Performance Of Aluminum Foil Etching Process And Electric Double Layer Capacitor

Posted on:2013-02-18Degree:MasterType:Thesis
Country:ChinaCandidate:D S HongFull Text:PDF
GTID:2232330374989141Subject:Materials science
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Electrical double-layer capacitors (EDLC), also called supercapacitors, use ion adsorption for storing energy. It has good power characteristics, long cycle life, fast charge and discharge capacity, environmentally friendly advantages and so on, can complement or replace batteries in electrical energy storage and harvesting applications when high power delivery or uptake is needed. EDLCs have a wide range of applications, such as power source for cameras, notebook, cell phone, standby power and electric vehicle. At present, the studying of EDLCs are mainly focus on the preparation of activated carbon as the electrode material, the research about aluminum foil corrosion is still less. In this paper, we concentrate on the impact of aluminum foil corrosion on electrical double-layer capacitors. By studying the different of activated carbon, binder, conductive agent, load the amount of carbon and carbon slurry mixing, impact on electrical double-layer capacitors, to determine the optimum process conditions of preparation the electric double layer capacitors, on this basis, focus on impact of electrochemical corrosion and chemical corrosion conditions on he electrochemical performance of electric double layer capacitor in order to determine the best aluminum foil corrosion condition.The main conclusions can be summarized as follows:1) Research mixing method of EDLC electrode active material. The best conditions is:vacuum mixing, decentralized sander and high shear emulsifier combination of mixing. Vacuum mixing the binder for0.5h until the binder is uniformly dispersed, adding activated carbon and conductive carbon black, continue to use the vacuum mixer stirring for3h, and then use decentralized sander mixing0.5h, then use high shear emulsifier mixing0.5h, finally use vacuum mixer stirring for1h.2) Studying the different of activated carbon, binder, conductive agent, load the amount of carbon. The best conditions is:external surface area is212.05m2/g, medium pore volume is0.183cm3/g of activated carbon, using0.8%CMC and7%of PTFE as binder, conductive carbon black, are the most suitable electrode material, and coating thickness is100μm.3) Studying the electrochemical corrosion process, such as current density, temperature, time and Cl/SO42-molar concentration ratio. The best electrochemical corrosion process is:corrosion current density is75mA/cm2, corrosion temperature is75℃, the etching time is60s, Cl/SO42-molar concentration ratio is3:1. use this process corroding aluminum foil, the specific capacitance of EDLC is155.5F/g, equivalent series resistance is1.4Ω, energy density is7.53W·h/kg, power density is16.57kW/kg, cycling performance is stability.4) Studying the chemical corrosion process, such as the etching time, temperature and Cl/SO42-molar concentration ratio. The best chemical corrosion process is:corrosion time is100s, corrosion temperature is80℃, Cl/SO42-molar concentration ratio is3:1, this process corrosion foil current collector, the EDLC of specific capacitance of168.3F/g, equivalent series resistance is0.9Ω, energy density is8.16W·/kg, power density is20.25kW/kg, the cycling performance is stability.
Keywords/Search Tags:Electrical Doube-Layer Capacitor, corrosion, capacitance, ESR
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