CuO/GO Compound Material Preparation And Properties Research

Graphene material has unique nano structure and the outstanding performance, hasattracted extensive attention of the scientific community. Graphene material not only has apotential in nanometer material of electronic components and optical sensor, but also in theenergy storage material research. In this thesis, GO material was prepared through modifiedHummer method. And CuO/GO composite material was prepared by tow methods, liquidphase synthesis method and solid phase synthesis method, and study research about theelectrochemical performance of CuO/GO composite material when used as lithium ion batteryanode materials and super capacitor electrode material.CuO/GO composite material was prepared through liquid phase synthesis method, werecharacterized by XRD, SEM, EDS and IR. The characterization exhibited that CuO particleswere formed in the composite material, particle size is about1μm, and was uniformlydispersed in the surfaces layers of GO. The electrochemical properties and batteryperformance was studied by CV, EIS and constant current charge-discharge tests. Test resultsshowed that CuO content is40.53%of composite material B performance is the best. Whenthe current is37.2mA·g^-1, the charge and discharge capacity is about984.3mAh·g^-1and939.6mAh·g^-1, when the current is372mA·g^-1, the charge-discharge capacity can keep at410mA·g^-1after100cycles.CuO/GO composite material was prepared through liquid phase synthesis method, werecharacterized by XRD, SEM, EDS, TEM and IR. The characterization exhibited that formedfine CuO particles in the composite material, particle size is about several nanometer, and wasuniformly dispersed in the surfaces layers of GO. The electrochemical properties and batteryperformance was studied by CV, EIS and constant current charge-discharge tests. Test resultsshowed that CuO content is15.875%of composite material K performance is the best. Whenthe current is37.2mA·g^-1, the charge and discharge capacity is about906.5mAh·g^-1and730.4mAh·g^-1, when the current is372mA·g^-1, the charge-discharge capacity can keep at472.6mA·g^-1after100cycles, and showed a better reversibility and cycle ability.GO and CuO all have fine capacitive performance, so in this paper also tested thecomposite material capacitance performance. When the composite was prepared by the liquid synthesis method, the test results show that Composite capacitance mainly comes from redoxpseudocapacitance, when the current is5mA, Its charge-discharge specific capacitance is286F·g^-1and239F·g^-1, it is a kind of high capacitance electrode materials. While the compositewas prepared by the liquid synthesis method, CuO and GO have good cooperation, and theyproduce electric double layer capacitance and redox pseudocapacitance, when the current is5mA, its charge-discharge specific capacitance is463F·g^-1and195F·g^-1. when the current ofdischarge is very high, the capacitors of composite is almost electric double layer capacitor,this suggests that the material has better capacitive and stability performance when the rate ofcharge and discharge is very fast.