The Properties Of Soft Super-capacitors Based On ?"-Al₂O₃/BaTiO₃ Composite Materials

As the progross of the industrial era, the huge social and economic development and living standards, oil, coal and other conventional energy declined sharply, human around the world put more attention on resources and the environment. As a clean energy, the storage of electricity is also of highly valued. As a new type of energy storage device, for its fast charge and discharge rate, large energy storage, large specific power, good stability and long life and other factors, supercapacitor is widely used in new energy and various types of electronic equipment. At present,the technology of liquid supercapacitors had already been relatively mature, most focus are payed on the exploration of the electrode and the electrolyte. However, there are limitations of the expansion of the liquid electrolyte supercapacitor performance, which affected liquid electrolyte on portability, convenience and packaging. With fast-ionic conductor as an electrolyte core material and make organic composite, process improvements, it improves the performance of the device.The main work includes powder materials synthesis, sample preparation, characterization and electrochemistry electrolyte material testing modules, and data analysis, the corresponding conclusions. Details are as follows:?1? With the use of high-energy ball milling,process electrolyte material synthesized Na-?"-Al₂O₃ and Ba Ti O₃ nano-powder, and materials characterization.?2? by applying the process to PVA as a binder, we were prepared Na-?"-Al₂O₃, Ba Ti O₃Na-?"-Al₂O₃ / Ba Ti O₃ and various chip-type/winded composite sample.?3? Each type-chip/winding samples were tested by cyclic voltammetry and electrochemical charge and discharge performance test, an increase from the smallest?-0.5V + 0.5V? to the maximum?-2.5V + 2.5V? cyclic voltammetry were tested and with the corresponding charge-discharge performance test. When the composite material with the ratio of PVA / Al₂O₃ / Ba Ti O₃ is 1: 2: 1, the specific capacitance of chip samples is 12.6m F / g, with an energy density of 30.98 Wh / kg, a power density of 1.29 W / kg; Winded-sample capacitor reaches 109 m F, specific capacitance up to 54.60 m F / g, an energy density of 57.05 wh / kg and a power density of 22.8W / kg.?4? Each sample took frequency impedance test, build and fit out the equivalent circuit mode of each composite material to explain the corresponding conductive mechanism.?5? Na-?"-Al₂O₃, Na-?"-Al₂O₃ / Ba Ti O₃ winded-sample pieces were tested by the type of series and parallel combinations,performance and the corresponding electrochemical impedance frequency characteristics, then established appropriate internal equivalent circuit model to explain the corresponding conductive mechanism.