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Preparation method for flexible graphene-modified knittable carbon nanofiber

A technology of carbon nanofiber and graphene, which is applied in the chemical industry to achieve the effects of large mass specific capacity, extended cycle life, and excellent high-current charge and discharge performance

Inactive Publication Date: 2014-02-12
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there has been no report so far on the use of graphene-modified carbon fibers as anode materials for lithium-ion batteries.

Method used

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  • Preparation method for flexible graphene-modified knittable carbon nanofiber
  • Preparation method for flexible graphene-modified knittable carbon nanofiber
  • Preparation method for flexible graphene-modified knittable carbon nanofiber

Examples

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Effect test

Embodiment 1

[0031] 1.5 g of polyacrylonitrile with a molecular weight of 70,000 was dissolved in 14 ml of DMF solution, and after a clear solution was obtained under magnetic stirring, 1 ml of graphene oxide in DMF solution was added until the two solutions were mixed evenly. Transfer the prepared precursor solution to a plastic container with a metal needle on the tip of the container, and connect it to a power supply device that can provide high-voltage static electricity. Under the action of an electric field force of 10KV, a blend of graphene oxide and polyacrylonitrile is obtained. Precursor nanofibers, the precursor nanofibers are in the air atmosphere tubular quartz tube, from room temperature to 270 °C at a rate of 5 °C per minute, and then in a nitrogen atmosphere at a rate of 10 °C per minute to 1100 °C to obtain graphene modification of carbon nanofibers.

Embodiment 2

[0033]1.5g of polyacrylonitrile with a molecular weight of 70,000 is dissolved in 20ml of graphene oxide saturated DMF solution, and under electric stirring, a clear precursor solution is obtained, which is transferred to a plastic container with a metal pillow on the tip of the container. Provide a high-voltage electrostatic power supply connection. Under the action of an electric field force of 20KV, the precursor nanofibers blended with graphene oxide and polyacrylonitrile are obtained. The precursor nanofibers are transferred to a tubular quartz tube, and the precursor nanofibers are transferred from room temperature to The temperature rises from 5°C to 600°C per minute, and after passing in hydrogen for one hour, continue to pass in argon to 1100°C to obtain graphene-modified carbon nanofibers.

Embodiment 3

[0035] 1.5g of polyacrylonitrile with a molecular weight of 70,000 is dissolved in 20ml of graphene oxide saturated DMF solution, and under electric stirring, a clear precursor solution is obtained, which is transferred to a plastic container with a metal pillow on the tip of the container. Provide a high-voltage electrostatic power supply connection. Under the action of an electric field force of 20KV, the precursor nanofibers blended with graphene oxide and polyacrylonitrile are obtained. The precursor nanofibers are in a tubular quartz tube in a nitrogen atmosphere. 2°C to 270°C, transferred to a tube furnace with an argon atmosphere, and then raised to 2700°C at a rate of 5°C per minute to obtain graphene-modified carbon nanofibers.

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Abstract

A preparation method for a flexible graphene-modified knittable carbon nanofiber belongs to the technical field of chemical industry. The preparation method comprises the following steps: at first, graphene oxide is taken to be placed in a container filled with DMF (Dimethyl Formamide) to obtain a graphene oxide saturated solution with the brown-yellow upper layer, then, polyacrylonitrile macromolecules are dissolved in the DMF to obtain a transparent macromolecular solution, the graphene oxide saturated solution and the macromolecular solution are mixed to obtain a precursor solution, a grapheme-modified polyacrylonitrile fiber is obtained through the electrostatic spinning technology or the melt spinning technology, the drying and stabilizing are performed, and at last, the carbon nanofiber is prepared from the dried polyacrylonitrile fiber in the inert gas environment or the vacuum condition. The carbon nanofiber prepared by the method can be applicable to lithium ion batteries or electrochemical capacitors, and besides, is also applicable to the fields of the war industry and the aerospace.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to a method for preparing carbon nanofibers. Background technique [0002] Lithium-ion secondary battery is an efficient, safe and environment-friendly energy storage device, which has great market application prospects and commercial value. [0003] The lithium-ion secondary battery uses a lithium-intercalated carbon material as the negative electrode, a transition metal oxide as the positive electrode, and an organic electrolyte solution in which lithium salt is dissolved as the electrolyte. The intercalation-extraction cycle of lithium ions between the electrodes is used to store and release electrical energy. The main characteristics of lithium-ion batteries are: (1) high voltage, the normal working voltage range is 2.75-4.2 V, and the average working voltage can reach more than 3.6 V, which is three times that of nickel-cadmium and nickel-metal hydride batteries, which ...

Claims

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Application Information

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IPC IPC(8): C01B31/02H01M4/1393B82Y30/00B82Y40/00C01B32/15C01B32/184
CPCY02E60/122Y02E60/10
Inventor 关宏宇付沙威马丽邵长路刘益春
Owner NORTHEAST NORMAL UNIVERSITY
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