The Research Of Nickel-based Supercapacitor Electrode Materials Preparation And Electrochemical Performance

Supercapacitor is a new type electrochemical energy storage device, which has characteristic between battery and traditional capacitor. The electrochemical performance difference lies in the selection of electrode materials. Nickel-based supercapacitor electrode material have been the main research in the present. The main subject of the study was use the basic principle of hydrothermal synthesis method to prepared nickel electrode material with good electrochemical performance.The main resrarch contents are as follows:1. The volume ratio of the deionized water to absolute ethanol of hydrothermal method was studied in preparation of NiO nanomaterial, the results showed that the volume ratio of the deionized water to absolute ethanol has most significant influence on the morphology of NiO nanomaterial, The morphology of the obtained NiO samples varied from nanoflakes to nanoparticles with the different volume ratios of water to ethanol. By cyclic voltammetry and constant current charge and discharge test can see obvious redox peak, indicated that the nickel oxide redox reaction was the dominant factor for pseudocapacitance characteristic; Its specific capacitance is up to 1046 F g-1 at a current density of 1.88 A g-1.After 1000 cycles, the capacitance is still retained 58.3%.2. The precipitating agent and reaction temperature of hydrothermal method was studied in preparation of NiCo2O4 nanomaterial. Through electrochemical measurement and analysis of the materials, the results showed that NiCo2O4 prepared by urea as precipitator at 120 ℃ had a higher capacitor performance with the different precipitating agent and reaction temperature. By cyclic voltammetry and constant current charge and discharge test can see obvious redox peak of five different materials, indicated that the NiCo2O4 redox reaction was the dominant factor for pseudocapacitance characteristic; Its specific capacitance is up to 328.5 F g-1 at a cuttent density of 0.62 A g-1.After 1500 cycles, the capacitance is still retained 95.2%.3.The synthetic methods and reaction time of hydrothermal method was studied in preparation of NiCo2S4 nanomaterial. Through electrochemical measurement and analysis of the materials, the results showed that NiCo2S4 prepared in C2H5 OH by 12 hours had a higher capacitor performance with the different synthetic methods and reaction time. By cyclic voltammetry and constant current charge and discharge test can see obvious redox peak of materials, indicated that the NiCo2S4 redox reaction was the dominant factor for pseudocapacitance characteristic; Its specific capacitance is up to 743.1 F g-1 at a cuttent density of 0.12 A g-1 and 448.1 F g-1 at a cuttent density of 1.25 A g-1 with the increase of current density.