Preparation And Research On Properties Of Composite Electrode Materials For Supercapacitors

As a new type of energy storage device, supercapacitor has the advantages of high power density and good cycling property, which recently makes it attract tremendous interests in electrochemical energy storage applications. Electrode material, one of the most crucial factors restricting the performance of supercapacitor, has been a hot area of research. How to reduce the cost of electrode material and improve the whole property of material is a topic which the researchers face. Based on the background above, the main contents of work in this paper are summarized as follows:Firstly, the attapulgite coated with nitrogen-doped carbon (ATP@NC-3) was prepared by treating the low-cost(ATP) attapulgite coated with polyaniline which was synthesized by in-situ chemical polymerization at high temperature. The morphology, structure and properties of the samples were characterized by SEM, XRD, FTIR, DTA, BET and electrochemical measurements. The results proved that the target product were synthesized and its properties were excellent.Secondly, NiCo2O4,as transition metal oxide, was deposited on ATP@NC-3 carrier by hydrothermal and calcinating methods, alleviating the reunion phenomemon in conventional preparation method. The morphology, structure and properties of the composite were characterized by SEM, XRD, FTIR and electrochemical measurements, a series of synthetic conditions influencing the performance of products were explored and the optimum reaction conditions were determined.Additionally, in order to improve the utilization of mesh on nickel foam, ATP@NC-3 was firstly filled in the partial channels of nickel foam and then NiCo2O4 nanorods with a layered structure supported by nickel foam was prepared via hydrothermal-calcinating strategy. The morphology, structure and properties were characterized by SEM, XRD and electrochemical measurements. The experimental results showed that filling ATP@NC-3 could improve the utilization of meshes on nickel foam and enhance the performance of whole material.Finally, carben nanotubes(CNTs) were used as the filler of mesh on nickel foam, NiCo2S4 which is superior to NiCo2O4 in conductivity was loaded successfully on nickel foam via two-step hydrothermal method. The morphology, structure and properties of samples were also characterized by SEM, XRD and electrochemical measurements. The enhancement of the whole material’s electrochemical properties indicated the advantage and significance of improving the utilization of mesh on nickel foam.