A kind of znfe2o4 porous nanotube negative electrode material for lithium ion battery and preparation method thereof by electrospinning

Abstract

The invention belongs to the technical field of a negative electrode material for a lithium ion battery, and particularly relates to a ZnFe2O4 porous nanotube negative electrode material for a lithium ion battery and an electrostatic spinning preparation method thereof. According to the method, a homogeneous solution formed by Zn<2+> salt, Fe<3+> salt, high-molecular-weight PVP (polyvinylpyrrolidone) and an organic solvent is a spinning solution; a Zn<2+> salt / Fe<3+> salt / PVP composite fiber membrane is prepared by a simple electrostatic spinning method; then, the ZnFe2O4 porous nanotube negative electrode material for the lithium ion battery is directly prepared through a simple air atmosphere calcining process. The process is simple; the cost is low; the prepared material has a better one-dimensional porous nanotube structure, so that the material has the large specific surface area, a unique porous hollow structure and a crosslinking network-like structure; the transfer of ions / electrons and the permeation of electrolyte are effectively promoted; the diffusion path of lithium ions in the material is shortened; the embedding and the disembedding of the lithium ions are facilitated; the initial discharge capacity is high.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium-ion batteries, and in particular relates to a ZnFe battery for lithium-ion batteries 2 o 4 Porous nanotube negative electrode material and preparation method thereof by electrospinning. Background technique [0002] Lithium-ion batteries are widely used, and fuel energy is in short supply. It is urgent to develop environmentally friendly and high-capacity lithium-ion battery anode materials. transition metal oxide ZnFe 2 o 4 Because of its high theoretical capacity, it is a superior lithium-ion anode material. [0003] Common Synthetic ZnFe 2 o 4 There are the following three methods for hollow tubes: (1) ZnO nanofiber template method, such as Guo et al. 2 o 4 The method of nanotubes, the first step is to use a 1cm×1cm single crystal sapphire substrate to grow ZnO nanofibers on the substrate material by hydrothermal synthesis, and then immerse the ZnO nanof...

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(3) Electrospinning method, such as Zhu et al. (Acta Phys-Chim.Sin. 2012,28(5),1265-1268) reported the preparation of ZnFe by electrospinning method 2 o 4 For nanotubes, the first step is to prepare the precursor solution, adding a certain mass of zinc nitrate and iron nitrate in a molar ratio of 1:2 to a mixed solution of distilled water and ethanol (volume ratio 3:1), and then adding 6.5g of low The molecular weight of polyvinylpyrrolidone (PVP, molecular weight about 30,000), magnetic stirring to form a precursor solution; the second step, spinning at a voltage of 15kV and a receiving distance of 15cm; the third step, the heating rate is 5°C / min , the spun film was calcined at 500°C for 3h to prepare nanotubes, but the inner diameter of the nanotubes was small and the morphology was not good, and the morphology did not improve the ZnFe 2 o 4 specific surface area

The first two preparations of ZnFe 2 o 4 The method of nanotubes is complex, time-consuming and costly, which is not conducive to industrial applications; the third method, although the electrospinning method is used to prepare ZnFe 2 o 4 Nanotubes, but the inner diameter of the tube is small and the shape is not good

[0004] Overall, the reported ZnFe 2 o 4 The preparation method of nanotubes The tube walls of the prepared nanotubes do not form a porous structure, which is not conducive to increasing the specific surface area

And so far, no electrospinning method has been used to prepare ZnFe 2 o 4 Related reports on porous nanotubes

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