A preparation method of Fe2O3/helical nano-carbon fiber composite negative electrode material

A technology of nano-carbon fiber and ferric oxide, which is applied in the direction of negative electrode, nanotechnology, nanotechnology, etc., can solve the problems of cumbersome and complicated process operation, potential safety hazards of experimenters, and inability to industrialize production, so as to improve the degree of graphitization and stabilize Good performance and improved cycle stability

Active Publication Date: 2022-04-01
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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Problems solved by technology

Although this preparation method combines carbon-coated ferric oxide nanoparticles with carbon nanotubes, it improves the low conductivity, low specific capacity and low specific capacity of carbon-coated ferric oxide nanoparticles as lithium ion battery negative electrodes However, this preparation method still has the following disadvantages: (1) The carbon nanotubes are activated by potassium hydroxide with strong alkalinity and corrosiveness, and the activation temperature reaches 850°C, which makes the experimenters have a large Potential safety hazards; (2) The entire process operation is cumbersome and complicated, and cannot be industrialized

Method used

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  • A preparation method of Fe2O3/helical nano-carbon fiber composite negative electrode material
  • A preparation method of Fe2O3/helical nano-carbon fiber composite negative electrode material
  • A preparation method of Fe2O3/helical nano-carbon fiber composite negative electrode material

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preparation example Construction

[0028] A preparation method of ferric oxide / helical nano-carbon fiber composite negative electrode material, comprising the following steps:

[0029] (1) Place the helical carbon nanofibers in a vacuum environment, and heat-treat at 700-900°C for 2-4 h, and set aside;

[0030] (2) Add the heat-treated helical carbon nanofibers into the mixture of water and ethanol, and obtain solution A after ultrasonic dispersion;

[0031] (3) Fe(NO 3 ) 3 •9H 2 O was added to solution A, and solution B was obtained after ultrasonic dispersion;

[0032] (4) Place solution B in an oil bath at 100-140°C for 4-6 hours, then filter and dry to obtain a solid reactant;

[0033] (5) Place the solid reactant obtained in step (4) in a tube furnace, then raise the temperature to 300-600 °C at a rate of 5-10 °C / min, and calcinate for 2-4 h to obtain the ferric oxide / Helical nano-carbon fiber composite anode material.

[0034] The invention adopts the helical nano-carbon fiber with a mass fraction ...

Embodiment 1

[0045] (1) Place the helical carbon nanofibers in a vacuum environment and heat-treat at 700 °C for 2 h, and set aside;

[0046] (2) Weigh 0.2 g of heat-treated helical carbon nanofibers and add them to a mixture containing 100 mL of water and 100 mL of ethanol, and ultrasonically disperse for 1 hour to obtain solution A;

[0047] (3) Weigh 1.6 g Fe(NO 3 ) 3 •9H 2 O was added to solution A, and solution B was obtained after ultrasonic dispersion for 10 minutes;

[0048] (4) Pour solution B into a 250 ml round bottom flask, and put it in an oil bath at 120 °C for 4 h. The product was suction filtered and dried at 80 °C for 12 h to obtain a solid reactant;

[0049] (5) Put the solid reactant obtained in step (4) in a corundum boat and place it in the middle of the tube furnace, then raise the temperature to 350°C at a rate of 5°C / min, and calcinate for 2 hours to obtain the Iron / helical nano-carbon fiber composite anode material.

[0050] In this embodiment, the electron m...

Embodiment 2

[0055] (1) Place the helical carbon nanofibers in a vacuum environment and heat-treat at 700 °C for 2 h, and set aside;

[0056] (2) Weigh 0.2 g of heat-treated helical carbon nanofibers and add them to a mixture containing 100 mL of water and 100 mL of ethanol, and ultrasonically disperse for 1 hour to obtain solution A;

[0057] (3) Weigh 2.0 g Fe(NO 3 ) 3 •9H 2 O was added to solution A, and solution B was obtained after ultrasonic dispersion for 10 minutes;

[0058] (4) Pour solution B into a 250 ml round bottom flask, and put it in an oil bath at 120 °C for 4 h. The product was suction filtered and dried at 80 °C for 12 h to obtain a solid reactant;

[0059] (5) Put the solid reactant obtained in step (4) in a corundum boat and place it in the middle of the tube furnace, then raise the temperature to 350°C at a rate of 5°C / min, and calcinate for 2 hours to obtain the Iron / helical nano-carbon fiber composite anode material.

[0060] The method in Example 1 was used t...

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Abstract

The invention discloses a method for preparing a ferric oxide / helical nano carbon fiber composite negative electrode material, which comprises the following steps: placing the helical nano carbon fiber in a vacuum environment, and heat-treating it at 700-900°C for 2-4 hours, and standby; The helical carbon nanofibers after heat treatment were added to the mixed solution of water and ethanol, and solution A was obtained after ultrasonic dispersion; the Fe(NO 3 ) 3 •9H 2 O was added to solution A, and solution B was obtained after ultrasonic dispersion; solution B was placed in an oil bath at 100-140°C for 4-6 hours, and then filtered and dried to obtain a solid reactant; the solid reactant was placed in a tube Then, the temperature was raised to 300-600°C at a rate of 5-10°C / min, and calcined for 2-4 hours to obtain the ferric oxide / helical nano-carbon fiber composite negative electrode material. The composite negative electrode material obtained by the preparation method has good cycle stability, high electrochemical performance, and no acidification or activation treatment steps, can effectively ensure the safety of experimenters, has a simple preparation process, and is suitable for industrial production.

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 method for preparing a ferric oxide / helical nano-carbon fiber composite negative electrode material. Background technique [0002] With the progress of human society and the development of science and technology, human society has a huge demand for energy, and the non-renewable energy in nature is facing exhaustion, which makes the development and application of energy face great challenges. As a new type of energy, lithium-ion batteries have the characteristics of high voltage, high energy density, stable charge-discharge curve, long cycle life, and environmental friendliness. Therefore, the development of environmentally friendly, non-toxic and non-polluting electrode materials and battery products is the current focus of attention and research in the battery industry. [0003] Fe 2 o 3 It has the advantages of hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/583H01M4/62H01M10/0525B82Y30/00
CPCH01M4/366H01M4/52H01M4/583H01M4/625H01M10/0525B82Y30/00H01M2004/027Y02E60/10
Inventor 金永中卿婷房勇陈建陈戈
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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