Sn And Ni Powder Materials Stimulated By Electrochemical Methodology For Ultracapacitors

To resolve the emerged serious energy crisis and environmental problems, ultracapacitor, as a new type of energy storage device, has become one of the hot topics since its power density and energy density is between battery and traditional capacitor. In recent years, its advantages have been manifested by the continuous and successful application in the fields such as electric vehicles, mobile telecommunication, military and consumer electronics. As the performances for ultracapacitors are mainly determined by electrode materials, there is no doubt that the exploitation of low-cost and high-performance electrode material is a key point for next generation ultracapacitors. Here, two facile electrochemical methods, cathodic corrosion and alternating voltage induced electrochemical synthesis, have been adopted to prepare nanomaterials for the applications in ultracapacitors and their performances have been explored. The contents of this thesis are listed as following:1) Core-shell tin/tin oxides nanoparticles had been obtained in room temperature ionic liquid BMPTF2via cathodic corrosion. The as-prepared tin/tin oxides were well-dispersed nanoparticles with a size of about5-15nm and its specific capacitance is8F·g-1at the current density of0.5A·g-1.2)NiO/Ni(OH)2hybrid was prepared by alternating voltage induced electrochemical synthesis (AVIES). The hybrid delivered excellent capacitive properties when evaluated as electrode materials for supercapacitors. A high capacitance of1170F·g-1is achieved when the charge-discharge current density is1A·g-1. Its specific capacitance remained80%after500cyclic charge-discharge tests at a current density of2A·g-1.