Preparation Of Lithium-Ion Anode Materials With Microstructure By Electrostatic Spinning Technology

Transition metal oxides are generally characterized by high specific capacity,abundant resources and high ionic conductivity,which compound the requirements of future lithium-ion anode materials,while their poor electrical conductivity and serious self-expansion in the cycle of charge and discharge limit the development of the materials.Therefore,this paper prepared two different structures of transition metal oxides as lithium-ion battery anode materials,the main research content is as follows.（1）3D Gd Fe O₃ and Bi Fe O₃ made of 1D nanofibers continuously stacked by simple electrostatic spinning was prepared,and after doping with 10%graphene,the material formed a cm-level carbon skeleton and the electrochemistry of the material was greatly improved.Gd Fe O₃ has a specific capacity of 259.31 m Ah·g^-1 after 10 constant current charge/discharge cycles at a voltage range of 0-3 V and a current density of 100 m A·g^-1,and a retained specific capacity of 199.21 m Ah·g^-1 after 40 cycles,while the material has good multiplicative performance with current densities of 100,200,300,400 and back to 100 m Ah·g^-1.The specific capacity at the beginning of each 10 cycles is 879.56,287.21,178.11,156.33 and 187.56m Ah·g^-1;Bi Fe O₃ has a specific capacity of 235.42 m Ah·g^-1 after 10 constant current charge/discharge cycles and a retained specific capacity of 180.33 m Ah·g^-1 after 40 cycles.Excellent multiplicative performance,with specific capacities starting at 769.85,220.33,173.78,154.99 and 328.45 m Ah·g^-1 per 10 cycles at the above current densities,Bi Fe O₃ has excellent resistance to polarization.The material with 3D three-dimensional stacking structure can significantly alleviate the weak conductivity of the material,thus improving the cycling performance and multiplicative performance of the material.（2）Lu₂Ti₂O₇ with tube-midline structure was prepared by electrostatic spinning,and the material has excellent electrochemical properties.The initial discharge capacity for 10 cycles is 456.22,167.23,150.53 and 140.43 m Ah·g^-1,and the first discharge capacity is 163.99 m Ah·g^-1 when the current returns to 100 m A·g^-1.The tube-midline structure is effective in improving the conductivity of the material and reducing the effect of polarization on the anode material.