Dissertation > Excellent graduate degree dissertation topics show

Research on Carbon Based Double Layer Capacitor of Low Internal Resistance

Author: LuoMan
Tutor: HeJunJia
School: Huazhong University of Science and Technology
Course: High Voltage and Insulation Technology
Keywords: Electric double layer capacitor Equivalent series resistance Specific capacitance Electrochemical properties
CLC: TM53
Type: Master's thesis
Year: 2006
Downloads: 164
Quote: 2
Read: Download Dissertation

Abstract

Electric double layer capacitor in recent years, the emergence of a new energy device, both conventional capacitor power density, high energy density of rechargeable batteries, fast charge and discharge, and long life, and hopefully develop into a new, more effective practical energy storage devices. However, due to the low working voltage of the single electric double-layer capacitor equivalent series resistance large space which limits its development. Reduce the equivalent series resistance of the electric double layer capacitor having excellent discharge performance can make it, so that the large current discharge becomes possible to greatly broaden its field of application. Which has become an extremely important indicator to reflect the performance of electric double layer capacitor equivalent series resistance. Reduce the equivalent internal resistance of the electric double layer capacitor has a very important theoretical significance and practical value to improve its performance, expand its field of application. The use of activated carbon material production of electric double layer capacitor, the formation mechanism of the internal resistance of the electric double layer capacitor is analyzed theoretically, and test study how to reduce the electric double layer capacitor equivalent series resistance. By theoretical analysis, the main contact between the polarizable electrode and a collector volume resistivity of the electrolyte solution resistance, membrane pore size and thickness of the polarizable electrode, a collector and the lead resistance of the electric double layer capacitor equivalent series resistance factor. Effective through different experimental programs, galvanostatic charge-discharge, cyclic voltammetry and electrochemical impedance spectroscopy analysis of test methods to study the electrical characteristics of the electric double layer capacitor, come to reduce the electric double layer capacitor equivalent series resistance measures for the production of low resistivity polarized electrodes: the use of high quality materials and good preparation process, we use homemade electrode pads better performance; suitable material, electrolyte concentration, we use 6 to 8 mol / L KOH solution performance better; good large specific surface area thin conductive material as a collector. Paper, the copper embossing process better performance; using a porous, high strength, ultra-thin material as the separator. The assembly process will be within the core in parallel and do vacuum treatment can also reduce the equivalent series resistance of the electric double layer capacitor. Finally, a high specific surface area of ??industrial activated carbon as the main material, the preparation of a high specific capacitance low internal resistance polarization electrode, single electrode capacitance 116.065F / g monomer capacitance 7.962F equivalent series resistance 0.113Ω Preparation of the finished capacitor, the capacitance of 101F, and the equivalent series resistance of 0.030Ω.

Research on Carbon Based Double Layer Capacitor of Low Internal Resistance

Abstract

Related Dissertations