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Method for preparing lithium ion battery cathode material ZnFe2O4/C nano fibers

A technology of lithium-ion batteries and nanofibers, which is applied in battery electrodes, nanotechnology, fiber processing, etc., can solve the problems of poor electrode cycle stability, improve electrochemical cycle stability, simplify the preparation process, and alleviate volume changes. Effect

Inactive Publication Date: 2011-08-17
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a kind of electrospinning to prepare battery anode material ZnFe 2 o 4 / C nanofiber approach for pure phase ZnFe 2 o 4 Negative electrode material defect, using polymer as carbon source, prepared ZnFe 2 o 4 / C composite material, which improves the conductivity of the electrode material and solves the problem of poor cycle stability of the electrode

Method used

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  • Method for preparing lithium ion battery cathode material ZnFe2O4/C nano fibers
  • Method for preparing lithium ion battery cathode material ZnFe2O4/C nano fibers
  • Method for preparing lithium ion battery cathode material ZnFe2O4/C nano fibers

Examples

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Embodiment 1

[0020] A lithium ion battery anode material ZnFe 2 O 4 / C Nanofiber preparation method, the preparation method includes the following steps:

[0021] a) Dissolve polyacrylonitrile and polymethyl methacrylate in N,N-dimethylformamide at a mass ratio of 1:1, and stir magnetically to obtain a polymer solution;

[0022] b) Dissolve ferric nitrate and zinc acetate in the polymer solution prepared above in the ratio of Fe element: Zn element = 1:2, and magnetically stir for 10 hours to obtain a uniform spinning solution;

[0023] c) Pass the spinning solution through the electrospinning device, and spin under the conditions of a pump flow rate of 2ml / h, a voltage of 28KV, and a distance between the syringe needle and the receiving plate of 20cm to obtain precursor nanofibers.

[0024] d) Dry the precursor in a drying box at 70°C for 10 hours, raise it to 250°C at 0.5°C / min in an air atmosphere, and keep it at 250°C for 2 hours; then at 2°C in an argon atmosphere / min to 600°C, keep it at 60...

Embodiment 2

[0026] A lithium ion battery anode material ZnFe 2 O 4 / C Nanofiber preparation method, the preparation method includes the following steps:

[0027] a) Dissolve polystyrene and polymethyl methacrylate in N,N-dimethylformamide at a mass ratio of 1:4, and stir magnetically to obtain a polymer solution;

[0028] b) Dissolving iron acetylacetonate and zinc chloride in the polymer solution prepared above at the ratio of Fe element: Zn element = 1:2, and magnetically stirring for 12 hours to obtain a uniform spinning solution;

[0029] c) Pass the spinning solution through the electrospinning device, and spin under the conditions of a pump flow rate of 2ml / h, a voltage of 28KV, and a distance between the syringe needle and the receiving plate of 20cm to obtain precursor nanofibers.

[0030] d) Dry the precursor in a drying box at 90°C for 10 hours, raise it to 250°C at 0.5°C / min in an air atmosphere, and keep it at 250°C for 6 hours; then at 2°C in an argon atmosphere / min to 1000°C, keep ...

Embodiment 3

[0032] In this example, the anode material ZnFe of lithium ion battery was prepared 2 O 4 The method of / C nanofiber is:

[0033] a) Accurately weigh 0.558 g of polyacrylonitrile and 1.118 g of polymethyl methacrylate and dissolve them in 10 ml of N,N-dimethylformamide, stir magnetically to obtain a polymer solution with a mass fraction of 12%;

[0034] b) Weigh 0.353 g of iron acetylacetonate and 0.12 g of zinc acetate and dissolve in the polymer solution prepared above, magnetically stir for 12 hours to obtain a uniform spinning solution;

[0035] c) Pass the spinning solution through the spinning device, and spin it under the conditions of a pump flow rate of 2ml / h, a voltage of 28KV, and a distance between the syringe needle and the receiving plate of 20cm to obtain precursor nanofibers.

[0036] d) Dry the precursor nanofibers in a drying oven at 80°C for 10 hours, calcinate in an air atmosphere at 250°C for 4 hours, and then calcinate in an argon atmosphere at 800°C for 4 hours, ...

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Abstract

The invention discloses a method for preparing lithium ion battery cathode material ZnFe2O4 / C nano fibers. The method has the advantages that: 1, the preparation process flow is short, the diameter of the nano fibers can be controlled more effectively, nano fiber precursors with regular structure are obtained, and the lithium ion battery cathode material ZnFe2O4 / C nano fibers with uniform structure are prepared by combining different change of two polymers in the calcining process; and 2, the prepared lithium ion battery cathode material ZnFe2O4 / C nano fibers are apparently nano fibers, the diameter of the nano fibers is about 200 to 400 nanometers, ZnFe2O4 nano granules are distributed in the continuous phase of carbon in the internal structure, and meanwhile, because of the carbon, the volume change in the electrode circulating process is greatly relieved, the problem of granule agglomeration in the circulating process is solved and the electrochemical circulating stability is improved.

Description

Technical field [0001] The invention relates to a preparation method of a lithium ion battery negative electrode material. Background technique [0002] Lithium-ion batteries are widely used as power sources for various electronic products, such as laptop computers, digital cameras, mobile phones, and electric vehicles because of their high energy density, environmental friendliness, high safety, and long cycle life. Lithium-ion batteries are one of the high-energy batteries that can meet the requirements of future social development, but the limitations of their electrode materials restrict the rapid development of lithium-ion batteries. At present, all commercial lithium-ion batteries use graphite-based carbon materials as the negative electrode. The theoretical specific capacity of graphite-based carbon materials is 372mAh / g. After continuous research, the actual specific capacity of carbon materials is very close to its theoretical capacity. The potential of the negative ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139D01D5/00D01F1/10D01F9/22D01F9/21B82Y40/00
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 肖启振吴丽娟
Owner XIANGTAN UNIV
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