Preparation, Characterization And Electrochemical Properties Of Carbon-based Three-dimensional Ordered Macroporous Materials As Anode For LIBs

In recent years,three dimensional ordered macroporous?3 DOM?materials have been widely used in many fields,Because of the uniformity of pore size,the structure of three-dimensional order,such as catalysis,separation,electrochemistry,and so on.In this thesis,the synthesis of TiO₂-C nanocomposite?TCNs?was introduced,and it was studied as anode materials for lithium ion batteries?LIBs?.Firstly,polystyrene?PS?microspheres were synthesized by soap free emulsion polymerization method and then with butyl titanate,citric acid,ethanol,PF sol are mixed according to a certain amount of prepared titanium source precursor solution.TCNs were obtained by heat treatment after the precursor solution impregnated with PS template.Galvanostatic charge/discharge and electrochemical impedance spectroscopy techniques are employed to assess the properties of these nanocomposites for use in LIBs.Galvanostatic charge/discharge and electrochemical impedance spectroscopy techniques are employed to assess the properties of these nanocomposites for use in LIBs.These results demonstrate that TiO₂ can be effectively utilized with the assistance of the carbon in the electrode.The TCN3?55.4 wt%of TiO₂?is found to be the most efficient one with a high capacity of 549 mA h/g at 0.2 C after 100 cycles.In addition,it exhibits good cycling stability and superior rate capability as an anode material in LIBs.The reversible capacity can still be retained at 132 mA h/g at a high rate of 10 C.Such TCN represents a promising exploring direction for enhancing the device performance of metal oxide-based electrodes in LIBs.In addition,1.8 mol/L Fe?NO₃?3·9H₂O,ethylene glycol,PF sol is mixed to form the iron sources precursor solution according to certain proportion.Then the as-synthesized PS templates were soaked in the iron sources precursor solution.At last,the infiltered templates were transferred to a beaker and heated to induce thermal polymerization.The electrochemical properties of the 3 DOM ?-Fe₂O₃ as an anode material for LIBs were investigated with zhe same method.The results exhibited that the 3DOM ?-Fe2O₃ possessed superior electrochemical activity,with a high initial discharge capacity of 1883 mA h/g and a stable coulombic efficiency of around 95%after 60 cycles.