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Cobalt oxide carbon nanofiber flexible electrode material derived from MOF for lithium ion batteries and preparation method thereof

A carbon nanofiber, lithium-ion battery technology, applied in battery electrodes, nanotechnology for materials and surface science, active material electrodes, etc. The process is easy to fall off and other problems, so as to achieve good cycle stability, improve electrochemical performance, and improve cycle stability.

Inactive Publication Date: 2019-08-16
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the nanoparticles derived from MOF are easy to agglomerate, and the poor conductivity limits the application in the field of electrochemistry; the methods currently used include [Zheng, Honghe, Liu, et al.Graphene oxides-guided growth of ultrafineCo 3 o 4 nanocrystallites from MOFs as high-performance anode of Li-ion batteries[J].Carbon: An International Journal Sponsored by the American Carbon Society, 2015, 92119-125.], [Li Qiuzhong, Wei Fen, He Xiaoying, etc. Lithium-ion batteries co 3 o 4 Preparation and electrochemical performance of / C composite anode materials[J].Journal of Ningde Normal University (Natural Science Edition),2018,30(3):286-292.]
But all Co 3 o 4 When the carbon / carbon composite material is used as the negative electrode of lithium-ion batteries, the traditional slurrying method is still used to coat the electrode material on the current collector. The electrode preparation process is cumbersome

Method used

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  • Cobalt oxide carbon nanofiber flexible electrode material derived from MOF for lithium ion batteries and preparation method thereof
  • Cobalt oxide carbon nanofiber flexible electrode material derived from MOF for lithium ion batteries and preparation method thereof
  • Cobalt oxide carbon nanofiber flexible electrode material derived from MOF for lithium ion batteries and preparation method thereof

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preparation example Construction

[0027] The preparation method of the cobalt oxide carbon nanofiber flexible electrode material derived from MOF for lithium ion battery of the present invention comprises the following steps:

[0028] (1) Prepare metal-organic framework ZIF-67 nanoparticles with uniform size by stirring at room temperature;

[0029] (2) Polyacrylonitrile is uniformly dispersed in N,N-dimethylformamide, then the ZIF-67 nanoparticles obtained in the step (1) will be added, stirred and dispersed evenly to obtain the precursor solution of electrospinning, and then As-spun carbon fibers containing polyacrylonitrile and ZIF-67 particles were prepared by electrospinning and collected by a rotating shaft receiver.

[0030] (3) Pre-oxidize, carbonize and oxidize the as-spun carbon fibers obtained in step (2) to obtain ZIF-67 derived Co 3 o 4 Carbon nanofiber flexible electrode materials.

[0031] In step (1), the preparation process of metal-organic framework ZIF-67 nanoparticles comprises the follo...

Embodiment 1

[0040] Step 1: Dissolve 1.75g ​​of cobalt nitrate hexahydrate in 20mL of ethanol solvent, and dissolve another 1.92g of dimethylimidazole in 20mL of methanol solvent. After the above two solutions are fully stirred until completely dissolved, quickly dissolve the dimethylimidazole The solution was poured into cobalt nitrate solution and stirred vigorously at room temperature. After the reaction is completed, use a high-speed centrifuge to separate to obtain the ZIF-67 material.

[0041] Step 2: Dissolve 0.8g of polyacrylonitrile in 10mL of N,N-dimethylformamide, stir magnetically at 60°C for 6h, and stir until the solution is bright yellow to obtain a PAN solution.

[0042] Step 3: Add 0.2 g of the ZIF-67 material obtained in Step 1 into the PAN solution, stir and dissolve evenly, and obtain an electrospinning precursor solution.

[0043] Step 4: Set the parameters of electrospinning: the voltage is 14kV, the rotational speed of the shaft receiver is 300r / min, the receiving d...

Embodiment 2

[0048] Step 1: Dissolve 1.75g ​​of cobalt nitrate hexahydrate in 20mL of ethanol solvent, and dissolve another 1.92g of dimethylimidazole in 20mL of methanol solvent. After the above two solutions are fully stirred until completely dissolved, quickly dissolve the dimethylimidazole The solution was poured into cobalt nitrate solution and stirred vigorously at room temperature. After the reaction is completed, use a high-speed centrifuge to separate to obtain the ZIF-67 material.

[0049] Step 2: Dissolve 1 g of polyacrylonitrile in 10 mL of N,N-dimethylformamide, stir magnetically at 80° C. for 6 h, and stir until the solution is bright yellow to obtain a PAN solution.

[0050] Step 3: Add 0.5 g of the ZIF-67 material obtained in Step 1 into the PAN solution, stir and dissolve evenly, and obtain the electrospinning precursor solution.

[0051] Step 4: Set the parameters of electrospinning: the voltage is 15kV, the rotational speed of the rotating shaft receiver is 500r / min, th...

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Abstract

The invention provides a cobalt oxide carbon nanofiber flexible electrode material derived from MOF for lithium ion batteries and a preparation method thereof. Carbon nanofibers containing ZIF-67 areobtained by electrospinning with a mixture of polyacrylonitrile and a metal organic frame material ZIF-67 as a precursor solution, and then, a Co3O4 carbon nanofiber flexible electrode material is synthesized through pre-oxidation, carbonization and oxidation heat treatment of electrospun fibers. The flexible electrode material prepared in the invention not only has good conductivity and cyclic stability of carbon materials (900mAh g<-1> after 100 cycles at the current density of 200mA g<-1>, but also has good rate performance (a capacity of 550mA g<-1> can still be maintained at the current density of 5000mA g<-1>) and the characteristics of high specific capacity of Co3O4.

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 cobalt oxide carbon nanofiber flexible electrode material derived from MOF for lithium ion batteries and a preparation method thereof. Background technique [0002] As a green chemical power source for electrochemical conversion and storage in the new world, lithium-ion batteries have been widely used in various fields due to their excellent electrochemical performance, and have become the focus of development and research around the world. At present, the commercial lithium-ion battery anode material is mainly graphite, but its low capacity cannot meet the needs of future development, so seeking new anode materials with high capacity and low cost is one of the focuses of current research on lithium-ion batteries. [0003] Metal-organic frameworks are synthesized from metal center ions and organic ligands, and framework...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/583H01M4/62H01M10/0525D01D5/00D01F9/22B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00D01D5/0015D01F9/22H01M4/362H01M4/523H01M4/583H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 欧阳海波黄启高李翠艳畅丽媛黄剑锋费杰许钊董继杰
Owner SHAANXI UNIV OF SCI & TECH
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