Preparation Of Graphene And Its Influence On The Performance Of The Battery In The Application Of Lithium Battery

Graphene, a two-dimensional SP~2 hybrid of carbon atoms, has a large specific surface area, good electrical conductivity and mechanical properties, so it is considered as a promising anode material for lithium ion batteries. At present, alternative alternative anode materials such as silicon, germanium, tin and aluminum to commercial as well as some technical difficulties need to break through, and the graphene due to its excellent mechanical and electrochemical stability have a greater likelihood of. In fact, due to the possibility of graphene anodes in commercial applications, the researchers have gradually begun to shift their focus to graphene based anode in the past few years. The current lithium ion battery using graphite anode, further conversion to graphene anode does not require major changes in raw materials.In this paper, different processes were used to prepare different metal oxide composites, and the anode of lithium battery was prepared by using composite materials, and the electrochemical properties of the materials were greatly improved. Specific research results are as follows:Through the smoking sulfuric acid was used for reduction of graphene oxide. By means of XPS and Raman spectra, it is proved that the conjugate system is extended, and the conductivity of SRGO is improved by four orders of magnitude compared with GO. Compared with other methods, the method proposed by this method does not require heat treatment to make the graphene oxide coated with thermally unstable oxide particles. Ni/Fe2O3 nanoparticles are a kind of thermal unstable material. We chose Ni/Fe2O3 nanoparticles, and the particles were evenly distributed on the SRGO surface. In fact, in the current density (C/20) compared to the non coated particles, SRGO coating significantly enhanced the rate performance and cycle stability of the battery.Tin sulfide was synthesized in the oxidation of graphene oxide colloid, tin sulfide/ graphene oxide was formed, and then the anode of lithium ion battery was restored. The preparation process of SnS/R-GO composite material, graphene oxide (GO) from aqueous colloidal separation and transferred to N,N-two methyl amide, hydrochloric acid and ethanol on graphene oxide colloid separation from water plays a vital role. The composite electrode can be safe in the potential range of 0.01-2.5 V reversible cycle, compared with the capacity of 630 mAh·G-1, which is much higher than the tin sulfide anode. In addition, the CMC binder electrode showed excellent rate performance and cycle performance.The solution method for the synthesis of simple MnO2/RGO nano composite materials was used as anode materials. Nano composite materials with high surface area and mesoporous structure, compared to MnO2 nanoparticles. Can provide the electrochemical reaction zone and Li+ ion diffusion path more, have improved in capacity and rate capability, and the mesoporous MnO2/RGO nanocomposites in volume expansion can be repeated in the MnO2 conversion reaction buffer, excellent cycling performance. In particular, due to the excellent conductivity of graphene and the rapid diffusion of Li ions, the additional conversion reaction between MnO and Mn3O4 increased the specific capacitance and the first Kulun effect.In order to improve the performance of the cathode, the novel graphene lithium composite was synthesized and used as the source of lithium ion battery. Lithium ion battery has a full carbon structure and has many advantages by using graphene lithium counter electrode and graphite anode. First, by not using cobalt and reducing toxicity, the environment is sustainable. In addition, metal (nickel, aluminum, iron, and copper) and conductive additives that enter the commercial cathode in the form of a dopant can significantly reduce the cost of the electrode. In contrast, the whole carbon battery is essentially composed of carbon anode and graphite anode, which greatly reduces the cost and complexity of the electrode. Finally, the specific capacity of the electrode is improved by the combination of the pure metal lithium in the counter electrode. Thereby greatly reducing the weight of the electrode and improving the performance index of the lithium ion battery.