Metal Oxide Materials and Collector Efficiency in Electrochemical Supercapacitors.

摘要

The Supercapacitor Technology Investment Fund (TIF) project aimed to develop improved supercapacitor performance through the design of better electrode materials. This will ultimately yield devices with elevated power and energy densities and/or performance tailored to the needs of the Canadian military. This report deals with the development of electrochemical supercapacitors based on MnO2 and binary manganese and ruthenium oxides with the use of various current collectors. The binary oxides were prepared and characterized by physicochemical and electrochemical techniques. The effect of the heat-treatment on the capacitance of the binary oxides was investigated as well as the effect of the supporting electrolyte, the current collector, and the composition of the composite electrode. Carbon nanotubes were coated on a carbon paper and used as support for the binderless spontaneous formation of MnO2. A correlation is drawn between pore size and capacitor performance for the combinations of active material, binder, and conductive carbon. New results are presented along with a summary of results from the previous two years of the project, and the performance of these new electrode materials is highlighted.