Advanced Hybrid Electrodes Based on Polyoxometalate-Activated Carbon for Electrochemical Energy Storage in Li-Ion Batteries

摘要

For fast charging and speeding up an electric vehicle, the high power of supercapacitors is needed. Driving a long distance can be realized by the high capacity of a battery. A combination of the advantages of supercapacitors and batteries in one material can bring novel possibilities for electric mobility in the future. Therefore, hybrid materials have attracted much attention in recent years, since they can simultaneously deliver high power and high energy density. Polyoxometalates (POMs), for example, the a-Kegging type: y H~+·[XM_(12)O_(40)]~(-y), are well known as very stable towards oxidation and reduction. These materials show fast and reversible multi-electron transfer reactions, and can, therefore, be considered as a promising candidate. In previous experiments, the properties of the POM were optimized for the use in an organic electrolyte by temperature treatment, and the cycling stability of the material improved by 20-times.