Preparation And Electrochemical Performance Study Of Carbon Nanotube Intercalation Composite Electrodes

Porous carbon materials are promising electrochemical energy storage materials due to their low cost,good electrochemical stability and high specific surface area.However,porous carbon materials also have problems such as low conductivity,so their rate performance and cycle stability are affected to some extent,which limits their further application in the field of high-end fast-charge batteries.Carbon nanotubes are one-dimensional nanomaterials with good electrical conductivity.Inserting carbon nanotubes into electrode materials can construct a conductive network structure with excellent performance.Therefore,this paper proposes to construct a high-performance composite electrode material by using carbon nanotubes to construct a high specific surface area network intercalation structure,and apply the material in the field of electrochemical energy storage.The main research results of this paper are as follows:?1?Graphene?GA-rGO?was prepared by chemical reduction of graphene oxide?GO?with gallic acid?GA?.GA-rGO and multi-walled carbon nanotubes?MWCNTs?were combined by vacuum filtration to prepare a layer shape and adhesive free electrode material with high specific capacitance.Studies have shown that GA-rGO/MWCNTs-10%hybrid films exhibit ultra-high mass specific capacitance(337.6F g^-1)and volume specific capacitance(151.2 F cm^-3),while the assembled symmetrical devices have an ultra-high mass specific capacitance(291.6 F g^-1),volumetric specific capacitance(136.6 F cm^-3),high energy density(10.13 Wh kg^-1),volumetric energy density(8.10 mW h cm^-3)and excellent cycle stability?The specific capacitance retention rate is 97.7%after 10000 cycles?.?2?The rGO nanosheets and V₂O₅ nanobelts based on 3D skeleton network structure were successfully prepared by simple hydrothermal method.The results show that the V₂O₅ nanobelts are evenly distributed on rGO nanosheets,and the electrochemical properties of rGO/V₂O₅ can be adjusted by changing the mass fraction of V₂O₅.The electrochemical test results show that the rGO/V₂O₅ composite has a specific capacitance of 310.1 F g^-1(1A g^-1)and 195.2 F g^-1(10 A g^-1).In addition,symmetrical supercapacitors based on rGO/V₂O₅ composites have a high specific capacitance of 225.6 F g^-1(0.5 A g^-1),a high energy density of 31.3 Wh kg^-1(249.7 W kg^-1)and excellent long-term cycle stability?90.2%after 5000 cycles?.?3?A“micro-explosion”method was proposed,which used this method to construct a unique N-doped porous carbon?NCFN?structural material and successfully interspersed MWCNTs into the carbon material matrix.At the same time,by controlling the protective atmosphere and holding time parameters,the content of ZnO nanocolumns can be effectively controlled.Studies have shown that NCFN-MWCNTs still have excellent electrochemical performance when the sulfur loading is up to 90wt%,and the single-cycle capacity attenuation of NCFN-ZnO-MWCNTs at 2C current density is only 0.032%.In summary,this paper adopts different technical methods to prepare carbon nanocomposites,and successfully applies carbon nanocomposites to electrochemical energy storage devices.The results show that carbon nanotube composites are an excellent electrochemical storage energy materials.