| 摘要: | 研究期間：10104~10203;This is a three-year research project that aims at developing a high-performance supercapacitor device, which incorporates ionic liquid (IL) electrolyte. The proposed new-generation supercapacitor is safe to operate and environmentally friendly. Combining the unique physicochemical characteristics of ILs and nano-structured metal oxide electrodes (or oxide/carbon composite electrodes), the large cell voltage, high energy density, high powder density, wide operation temperature range, and long cycle life of the constructed supercapacitors are anticipated. The major research task in the first year is to synthesize ILs with low viscosity, high conductivity, high thermal stability, and large potential windows for supercapacitor applications. In addition, effects of the size, shape, and chemistry of the constituent cations and anions in ILs on the pseudocapacitive properties of various oxide electrodes (e.g. RuO2, MnO2, Co3O4, Co(OH)2, Fe3O4, etc.) and composite electrodes will also be systematically investigated. In the second year, two strategies are going to be used to optimize the pseudocapacitive performance of the electrodes. One approach is to create a nano-architectured oxide electrode, promoting the electrochemical reactivity with IL electrolytes. The other is to design (or tailor) the composition of ILs (either modifying the constituent ions or adding foreign ions) to match the porosity, crystal structure, and chemistry of various electrodes, attempting to improve the pseudocapacitive reaction (That is why IL is considered as “task specific liquid”!). Based on the fundamental understanding of the energy storage mechanism of the supercapacitors, which incorporate various oxide electrodes and IL electrolytes, the main research focus in the third year is to construct a full-cell capacitor device. Assembling asymmetric anode and cathode electrodes will be attempted to further enlarge the cell voltage, which is beneficial for increasing both the energy density and power density of a supercapacitor. With the established knowledge and techniques, we will look forward to cooperating with supercapacitor industrials trying to put our laboratory results into practice applications. |
