Preparation of TiO2/nitrogen-doped CNF composites as high-performance lithium-ion battery anodes by electrospinning

Abstract

In this paper, nitrogen-doped carbon nanofibers encapsulated titanium dioxide nanoparticles (TiO2/NCNF) anode materials were prepared by electrospinning. Through the construction of heterojunctions, the inherent low ionic conductivity and electronic conductivity of transition metal oxides are overcome. Nitrogen-doped carbon nanofibers have the advantages of large active surface area, strong deformation stress and short ion diffusion path. In addition, nitrogen-doped carbon nanofibers can not only improve the storage capacity of lithium ions by introducing defects through heteroatom doping, but also further improve the electronic conductivity of carbon nanofibers. By encapsulating nanoparticles with nanofibers, the volume expansion and agglomeration problems during the material cycle are slowed down, and the electrochemical performance of the material is greatly improved. The TiO2/NCNF anode material still has a specific capacity of 386.1 mAh /g after 100 cycles at a current density of 0.1 A /g, and can maintain a specific capacity of 206.63 mAh /g at a high current density of 2 A /g.