Preparation method of carbon/cobalt/graphene composite nanofiber anode material

A graphene composite and nanofiber technology, which is applied in the fields of nanomaterials and chemical power sources, can solve the problems of no relevant reports on the preparation method, reduced battery energy density, and no lithium storage capacity, and achieves broad development prospects and application prospects. The effect of improving energy density and excellent electrochemical properties

Inactive Publication Date: 2016-11-23
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These additives themselves do not have the ability to store lithium, which reduces the energy density of the battery itself, especially the addition of binders may also affect the conductivity of the electrode
The present invention prepares carbon / cobalt / graphene composite nanofibers doped with metal cobalt through electrospinning and high-temperature carbonization techniques, without adding any additives and further processing, and can be directly used as the negative electrode of lithium-ion batteries, and its preparation method and application There are no related reports yet

Method used

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  • Preparation method of carbon/cobalt/graphene composite nanofiber anode material
  • Preparation method of carbon/cobalt/graphene composite nanofiber anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 3g of PAN and dissolve it in 27g of DMF, put it into a stirrer, adjust the appropriate speed, and stir at room temperature for 12-24 hours until uniform, and prepare a DMF solution with a mass fraction of PAN of 10%. Weigh 1.5g of cobalt chloride and 0.15g of graphene and add them into the above DMF solution, put them into a stirrer, adjust the appropriate speed, stir at room temperature for 8-10 hours, and ultrasonically oscillate for 1-3 hours to form a uniform solution. Spinning using an electrospinning device to obtain PAN / CoCl 2 / graphene composite nanofiber membrane, the spinning voltage is 20kV, the receiving distance is 20cm, and the spinning speed is 1mL / h. The obtained composite nanofiber membrane was put into a tube furnace, and the temperature was raised from room temperature to 250° C. at a heating rate of 2° C. / min in an air atmosphere, and the temperature was maintained for 2 h. Then, the temperature was raised to 800°C under nitrogen or argon prot...

Embodiment 2

[0020] Weigh 3g of PAN and dissolve it in 17g of DMF, put it into a stirrer, adjust the appropriate speed, and stir at room temperature for 12-24 hours until uniform, and prepare a DMF solution with a mass fraction of PAN of 15%. Weigh 1.5g of cobalt chloride and 0.15g of graphene and add them into the above DMF solution, put them into a stirrer, adjust the appropriate speed, stir at room temperature for 8-10 hours, and ultrasonically oscillate for 1-3 hours to form a uniform solution. Spinning using an electrospinning device to obtain PAN / CoCl 2 / graphene composite nanofiber membrane, the spinning voltage is 15kV, the receiving distance is 25cm, and the spinning speed is 0.5mL / h. The obtained composite nanofiber membrane was put into a tube furnace, and the temperature was raised from room temperature to 300° C. at a heating rate of 4° C. / min in an air atmosphere, and the temperature was maintained for 2 h. Afterwards, the temperature was raised to 600°C under nitrogen or ar...

Embodiment 3

[0022] Weigh 3g of PAN and dissolve it in 27g of DMF, put it into a stirrer, adjust the appropriate speed, and stir at room temperature for 12-24 hours until uniform, to prepare a DMF solution with a mass fraction of PAN of 10%. Weigh 1.5g of cobalt chloride and 0.1g of graphene and add them into the above DMF solution, put them into a stirrer, adjust the appropriate speed, stir at room temperature for 8-10 hours, and ultrasonically oscillate for 1-3 hours to form a uniform solution. Spinning using an electrospinning device to obtain PAN / CoCl 2 / graphene composite nanofiber membrane, the spinning voltage is 18kV, the receiving distance is 22cm, and the spinning speed is 0.8mL / h. The obtained composite nanofiber membrane was put into a tube furnace, and the temperature was raised from room temperature to 300° C. at a heating rate of 5° C. / min in an air atmosphere, and the temperature was maintained for 3 h. Then, the temperature was raised to 700°C under nitrogen or argon pro...

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Abstract

The invention discloses a preparation method of a carbon/cobalt/graphene composite nanofiber anode material and belongs to the technical field of nanomaterials and chemical power sources. According to the method, polyacrylonitrile, cobalt chloride, graphene and N,N-dimethylformamide are used as raw materials. A precursor, namely, PNA/CoCl2/graphene composite nanofiber membrane is prepared through electrostatic spinning firstly, then the obtained composite nanofiber membrane is placed in a high-temperature tube furnace to be carbonized, and the carbon/cobalt/graphene composite nanofiber anode material is obtained. The material prepared with the method can be directly applied to lithium ion batteries, no additive is required, production steps of the batteries are effectively reduced, and the energy density of the batteries is improved. The carbon/cobalt/graphene composite nanofiber anode material prepared with the method has excellent electrochemical properties, good cycle performance and the good high-magnification characteristic, so that the material used as a new-generation anode material for the lithium ion batteries has broad development and application prospect.

Description

technical field [0001] The invention relates to a method for preparing a carbon / cobalt / graphene composite nanofiber negative electrode material, and belongs to the technical field of nanomaterials and chemical power sources. Background technique [0002] Due to the popularization of portable electronic devices and the widespread use of electric vehicles, the development of an energy storage device that can last for a long time and provide stable energy has attracted more and more attention from researchers at home and abroad. Among them, lithium-ion batteries, as a new, efficient and environmentally friendly energy storage device, have been widely used in a large number of daily products such as mobile phones, notebook computers, and digital cameras. Compared with other rechargeable batteries, lithium-ion batteries have the advantages of no memory effect, high specific energy density, and low self-discharge rate, but they still cannot fully meet the requirements of high safe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1393H01M4/1395H01M4/525B82Y40/00
CPCY02E60/10
Inventor 乔辉陈克费雅倩罗磊魏取福
Owner JIANGNAN UNIV
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