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Preparation method and application of nitrogen-doped carbon nano fiber compound zinc oxide lithium ion battery cathode material

A technology of lithium-ion batteries and nanofibers, applied in the direction of battery electrodes, fiber chemical characteristics, negative electrodes, etc., can solve the problems of poor conductivity, volume expansion, etc., and achieve the effects of good fiber dispersion, reduced agglomeration, and small pore size

Inactive Publication Date: 2019-02-15
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the defects of specific capacity, poor conductivity, and severe volume expansion when zinc oxide is applied to lithium battery negative electrode materials, the present invention improves Zn0 by adjusting the morphology of Zn0 and compounding it with nitrogen-doped carbon nanofibers with good conductivity. The lithium storage electrochemical performance of the negative electrode material can alleviate the problem of Zn0 volume expansion during the cycle, improve the conductivity, and increase the specific capacity

Method used

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  • Preparation method and application of nitrogen-doped carbon nano fiber compound zinc oxide lithium ion battery cathode material
  • Preparation method and application of nitrogen-doped carbon nano fiber compound zinc oxide lithium ion battery cathode material
  • Preparation method and application of nitrogen-doped carbon nano fiber compound zinc oxide lithium ion battery cathode material

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Embodiment 1

[0026] (1) Preparation of polyacrylonitrile fiber:

[0027] Mix 1.5 g of polyacrylonitrile and 15 mL of dimethylformamide evenly, place on a magnetic stirrer and stir for 18 hours to obtain an electrospinning precursor solution, and then use an electrospinning machine to prepare polyacrylonitrile fibers for use.

[0028] (2) Preparation of nitrogen-doped carbon nanofibers:

[0029] The polyacrylonitrile fibers prepared in step (1) were placed in a tube furnace, and calcined at 800° C. for 4 hours under a nitrogen atmosphere to obtain nitrogen-doped carbon nanofibers.

[0030] (3) Preparation of zinc oxide / nitrogen-doped carbon nanofibers:

[0031] Put 0.8 g of nitrogen-doped carbon nanofibers prepared in step (2) into 200 mL of deionized water, then add 1.5 g of zinc chloride and 1.5 g of hexamethylenetetramine, stir evenly, and heat in a water bath at 80°C for 8 hours to obtain oxidation Zinc / nitrogen doped carbon nanofibers.

[0032] The nitrogen-doped carbon nanofiber co...

Embodiment 2

[0036] (1) Preparation of polyacrylonitrile fiber:

[0037] Mix 1 g of polyacrylonitrile and 10 mL of dimethylformamide evenly, place on a magnetic stirrer and stir for 12 hours to obtain an electrospinning precursor solution, and then use an electrospinning machine to prepare polyacrylonitrile fibers for use.

[0038] (2) Preparation of nitrogen-doped carbon nanofibers:

[0039] The polyacrylonitrile fibers prepared in step (1) were placed in a tube furnace, and calcined at 700° C. for 3 hours under a nitrogen atmosphere to obtain nitrogen-doped carbon nanofibers.

[0040] (3) Preparation of zinc oxide / nitrogen-doped carbon nanofibers:

[0041] Put 0.5 g of nitrogen-doped carbon nanofibers prepared in step (2) into 100 mL of deionized water, then add 1 g of zinc chloride and 1 g of hexamethylenetetramine, stir evenly, and heat in a water bath at 60 °C for 6 hours to obtain zinc oxide / Nitrogen-doped carbon nanofibers.

Embodiment 3

[0043](1) Preparation of polyacrylonitrile fiber:

[0044] Mix 2 g of polyacrylonitrile and 20 mL of dimethylformamide evenly, place on a magnetic stirrer and stir for 24 hours to obtain an electrospinning precursor solution, and then use an electrospinning machine to prepare polyacrylonitrile fibers for use.

[0045] (2) Preparation of nitrogen-doped carbon nanofibers:

[0046] The polyacrylonitrile fibers prepared in step (1) were placed in a tube furnace, and calcined at 900° C. for 6 hours under a nitrogen atmosphere to obtain nitrogen-doped carbon nanofibers.

[0047] (3) Preparation of zinc oxide / nitrogen-doped carbon nanofibers:

[0048] Put 1 g of nitrogen-doped carbon nanofibers prepared in step (2) in 200 mL of deionized water, then add 2 g of zinc chloride and 2 g of hexamethylenetetramine, stir evenly, and heat in a water bath at 90°C for 12 hours to obtain zinc oxide / nitrogen doped with carbon nanofibers.

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Abstract

The invention belongs to the chemical field of materials and relates to a preparation method of a lithium ion battery cathode material with a high specific capacity, in particular to a preparation method of the nitrogen-doped carbon nano fiber compound zinc oxide lithium ion battery cathode material. The preparation method comprises the following steps: first, preparing nitrogen-doped carbon nanofibers by means of an electrospinning method, wherein as polyacrylonitrile fibers are rich in nitrogen, the polyacrylonitrile fibers are carbonized at a high temperature to obtain the nitrogen-doped carbon nano fibers; and then preparing the zinc oxide / nitrogen-doped carbon nano fiber compound lithium ion battery cathode material by means of a hydrothermal method. The lithium storage electrochemical performance of the ZnO cathode material is improved by regulating the shape of ZnO and compounding the ZnO with the nitrogen-doped carbon nano fibers which are good in conductivity, the volume expansion problem of ZnO in a circulating process is alleviated, the conductivity is improved, and the specific capacity is improved.

Description

technical field [0001] The invention belongs to the chemical field of materials, and relates to a preparation method and application of a lithium-ion battery negative electrode material with high specific capacity, in particular to a preparation method of a nitrogen-doped carbon nanofiber composite zinc oxide lithium-ion battery negative electrode material, in particular to A method for preparing nitrogen-doped carbon nanofibers by electrospinning first, and then preparing zinc oxide / nitrogen-doped carbon nanofibers composite negative electrode materials for lithium-ion batteries by hydrothermal method. Background technique [0002] Energy is an important guarantee for the economic and social development of the world today and even in the future. Since the beginning of the 21st century, fossil raw materials such as coal, oil and natural gas have been developed in large quantities to meet people's ever-growing material needs. However, with the development of modern society, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525D01F9/10
CPCD01F9/10H01M4/362H01M4/48H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 王新王加义
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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