Boron-doped titanium dioxide nanofiber, preparation method for boron-doped titanium dioxide nanofiber and application of boron-doped titanium dioxide nanofiber as anode material of lithium ion battery

Abstract

The invention discloses boron-doped titanium dioxide nanofiber, a preparation method for the boron-doped titanium dioxide nanofiber and application of the boron-doped titanium dioxide nanofiber as ananode material of a lithium ion battery. According to the boron-doped titanium dioxide nanofiber, the diameter of the boron-doped titanium dioxide nanofiber is nano-scale, the length of the boron-doped titanium dioxide nanofiber is micron-scale, and the surface of the boron-doped titanium dioxide nanofiber is provided with micropores. The preparation method comprises the following steps that ethylalcohol, acetic acid, tetrabutyl titanate, tributyl borate and polyvinylpyrrolidone are mixed and dissolved so as to obtain a spinning solution; the spinning solution is treated through an electrostatic spinning process so as to obtain polymer nanofiber; and the polymer nanofiber is dried and calcined so as to obtain the anatase type boron-doped titanium dioxide nanofiber. The boron-doped titanium dioxide nanofiber is large in specific surface area, the infiltration of an electrolyte and the transmission of lithium ions are facilitated, in addition, boron doping is uniform, and the electrochemical activity is better; when the boron-doped titanium dioxide nanofiber is used for the lithium ion battery, excellent rate performance and cycle performance can be realized.

Description

technical field [0001] The invention relates to a boron-doped titanium dioxide material, in particular to a nanofibrous boron-doped titanium dioxide material, and also relates to a method for preparing boron-doped titanium dioxide nanofibers through an electrospinning process. and B-doped TiO 2 The application of nanofibers in high-rate and long-cycle lithium-ion batteries belongs to the technical field of lithium-ion electronic materials. Background technique [0002] Most of the anode materials used in commercial lithium-ion batteries are graphite-like carbon materials, but the graphite anode material has a low lithium intercalation potential, and its potential μ A Higher than the lowest unoccupied orbital (LUMO) of electrons in common electrolytes, it is easy to form an SEI film, and lithium dendrites are formed on the surface, causing safety hazards. Again, the surface defects of graphite are high, and the structural anisotropy restricts lithium ions in the graphite str...

AI Technical Summary

Problems solved by technology

After literature research and analysis, it was found that Cr, Mo 6+ , Nb, Zr, Co, La, Mn, Fe, N, Sb, Ti 3+ , Ni, Sm 3+ Doping with other elements to improve TiO 2 Performance in Li-ion batteries, but with B vs. TiO 2 There are very few studies on doping, let alone B-doped TiO 2 Nanofibers

Chinese patent (CN 103618076A) discloses a boron-doped submicron s

Images