Study on nanostructure evaluation of silicon carbide derived porous carbon and its application for capacitor electrode

Abstract

Carbide derived porous carbons (CDCs) have attracted significant attention for electrode materials of electric double layer capacitors (EDLCs). The purposes of this thesis are to improve the performance of capacitors using the CDCs and establish an inexpensive manufacturing method of the CDCs. In Chapter 1, the background and purposes of this study have been introduced. In Chapter 2, the nanostructures of various CDCs have been characterized. In Chapter 3, by focusing on the silicon carbide derived porous carbons (SiC-CDCs) because of their cost and availability of their raw material, steam activation of the SiC-CDCs was conducted and their nanostructures were evaluated. In Chapter 4, EDLCs using the obtained SiC-CDCs were fabricated and electrochemically evaluated. In Chapter 5, using the SiC-CDCs, lithium ion capacitors (LICs) were prepared and evaluated to enhance the energy density of capacitors. Moreover, the floating durability of LICs was improved using the activated SiC-CDCs surface-modified by heat treatment. In Chapter 6, to obtain affordable SiC-CDCs, the SiC-CDCs was fabricated from rice husk as raw material, which is a common agricultural waste material.