Preparation method for nitrogen-doped carbon fiber material

A nitrogen-doped carbon fiber, carbon fiber technology, applied in carbon fiber, fiber processing, textiles and papermaking, etc., can solve the problems of inability to prepare in large quantities, high temperature, harsh process conditions, etc., and achieve low cost, improved lithium storage performance, and simple process. Effect

Inactive Publication Date: 2017-07-18
HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the commonly used method for preparing nitrogen-doped carbon fibers is chemical vapor deposition. [3] , in situ growth method [4] , most of which require high temperature and harsh process conditions, and cannot be produced in large quantities

Method used

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  • Preparation method for nitrogen-doped carbon fiber material
  • Preparation method for nitrogen-doped carbon fiber material
  • Preparation method for nitrogen-doped carbon fiber material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Put urea and carbon fiber separately into a hydrothermal reaction kettle with a mass ratio of 1:5. After sealing, conduct a hydrothermal reaction at 180°C for 12 hours. After the reaction, cool to room temperature to obtain the final product nitrogen-doped carbon fiber material .

[0026] Embodiment 1 gained material uses X-ray diffraction to analyze crystal structure, as figure 1 As shown, the results show that the carbon fiber prepared in Example 1 is mainly composed of amorphous carbon.

[0027] Adopt scanning electron microscope to detect the morphology of the nitrogen-doped carbon fiber material that embodiment 1 obtains, as figure 2 As shown, the results show that the morphology of nitrogen-doped carbon fibers prepared in Example 1 is fibrous.

Embodiment 2

[0029] Put the ammonium carbonate and carbon fiber separately into the hydrothermal reaction kettle with a mass ratio of 1:8. After sealing, conduct a hydrothermal reaction at 200°C for 12 hours. After the reaction, cool to room temperature to obtain the final product nitrogen-doped carbon fiber. Material.

[0030] Embodiment 2 gained material uses energy spectrometer to analyze contained element, and result is as follows image 3 As shown, it is proved that nitrogen element has been doped to carbon fiber.

Embodiment 3

[0032] Put the ammonium carbonate and carbon fiber separately into the hydrothermal reaction kettle with a mass ratio of 1:10. After sealing, conduct a hydrothermal reaction at 180°C for 15 hours. After the reaction, cool to room temperature to obtain the final product nitrogen-doped carbon fiber. Material.

[0033] The morphology of the nitrogen-doped carbon fiber material obtained by electron transmission electron microscope detection embodiment 3, such as Figure 4 As shown, the results show that the morphology of nitrogen-doped carbon fibers prepared in Example 3 is fibrous.

[0034] The material obtained in Example 3 was assembled into a button battery, and the cycle performance of the battery was tested by using the blue electric battery test system. Such as Figure 5 As shown, the results show that the nitrogen-doped carbon fiber material prepared in Example 3 has excellent cycle performance, and after 500 cycles at a current density of 1A / g, the specific capacity sti...

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Abstract

The invention belongs to the technical field of a carbon fiber material. Specifically, a low-temperature pyrolysis method is adopted to perform nitrogen atom doping on carbon fibers. According to the method, low-cost nitrogen source and carbon fibers are used as raw materials; the mass ratio of the carbon source to the carbon fibers is controlled to be 1 to (1-10); and the nitrogen-doped carbon fibers are prepared by adopting the low-temperature pyrolysis method. The technological method provided by the invention has low-cost and easily-available raw materials, simple process, and relatively low cost, so that expansion of production can be carried out favorably; and the preparation method is of great practical significance to improvement of lithium storage performance of a negative electrode material of a lithium ion battery, so that the preparation method has potential popularization and application values.

Description

technical field [0001] The invention belongs to the technical field of carbon fiber materials, and specifically uses a low-temperature pyrolysis method to dope carbon fibers with nitrogen atoms. Background technique [0002] With the emergence of various electronic products, the electrochemical energy storage and conversion technology has attracted more and more attention from all over the world. Lithium-ion batteries (LIBs) have been widely used in mobile devices, digital electronic devices and other fields due to their high energy density, long cycle life, low self-discharge rate, and non-pollution. At present, commercial LIBs usually use graphitized carbon as the negative electrode material, with a theoretical specific capacity of 372 mAh / g and an energy density of about 150 Wh / kg, which cannot meet the needs of hybrid electric vehicles and pure electric vehicles. Therefore, the development of new high-capacity anode materials is one of the keys to the development of nex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M10/0525D06M13/432D06M11/76D06M11/71D06M101/40
CPCD06M11/71D06M11/76D06M13/432D06M2101/40H01M4/362H01M4/587H01M10/0525H01M2220/20Y02E60/10
Inventor 侯朝辉
Owner HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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