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Preparation method of MOFs coated high-conductivity multi-walled carbon nanotube composite material and application of MOFs coated high-conductivity multi-walled carbon nanotube composite material in potassium ion battery

A technology of multi-walled carbon nanotubes and composite materials, which is applied in the field of negative electrode materials for potassium ion batteries, can solve the problems of poor rate capability, poor cycle stability, poor conductivity and volume expansion of CoO negative electrodes, and achieves reduction of adsorption energy, improvement of solubility, and reaction. high yield effect

Active Publication Date: 2021-09-24
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, like other transition metal oxide anodes, CoO anode suffers from poor rate capability and poor cycle stability due to its inherent poor electrical conductivity and large volume expansion during charging and discharging.

Method used

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  • Preparation method of MOFs coated high-conductivity multi-walled carbon nanotube composite material and application of MOFs coated high-conductivity multi-walled carbon nanotube composite material in potassium ion battery
  • Preparation method of MOFs coated high-conductivity multi-walled carbon nanotube composite material and application of MOFs coated high-conductivity multi-walled carbon nanotube composite material in potassium ion battery
  • Preparation method of MOFs coated high-conductivity multi-walled carbon nanotube composite material and application of MOFs coated high-conductivity multi-walled carbon nanotube composite material in potassium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation of MWCNTs-CoO@C Nanocomposites

[0033] Dissolve 3.2g of polyvinylpyrrolidone in a mixed solution of 110mL of absolute ethanol and secondary deionized water, and after it forms a clear solution, add 1g of multi-walled carbon nanotubes with oxygen-rich functional groups on the surface to ultrasonically disperse them , and then stirred to form a solution, followed by 1.5g C 4 h 6 CoO 4 Mixed with the above solution to obtain a mixed solution A. 2.0gC 10 h 6 o 8 Dissolve in a mixed solution of 110mL absolute ethanol and secondary deionized water to form a transparent solution B. Add solution B to solution A while stirring at a constant speed, place until the solution and precipitate are clearly separated, and then centrifuge to collect the black precipitate product. The product was washed with absolute ethanol to remove residual polyvinylpyrrolidone and C 4 h 6 o 4 2- , and then the obtained product was dried at 70 °C for 12 h to obtain the precursor ...

Embodiment 2

[0036] Preparation of MWCNTs-CoO@C Nanocomposites

[0037] Dissolve 4.0g of polyvinylpyrrolidone in a mixed solution of 110mL of absolute ethanol and secondary deionized water. After it forms a clear solution, 1.4g of multi-walled carbon nanotubes with oxygen-rich functional groups on the surface are added to it for ultrasonication. Disperse, then stir to form a solution, then 1.9g C 4 h 6 CoO 4 Mixed with the above solution to obtain a mixed solution A. 2.8gC 10 h 6 o 8 Dissolve in a mixed solution of 110mL absolute ethanol and secondary deionized water to form a transparent solution B. Add solution B to solution A while stirring at a constant speed, place until the solution and precipitate are clearly separated, and then centrifuge to collect the black precipitate product. The product was washed with absolute ethanol to remove residual polyvinylpyrrolidone and C 4 h 6 o 4 2- , and then the obtained product was dried at 75 °C for 10 h to obtain the precursor powder ...

Embodiment 3

[0040] Preparation of MWCNTs-CoO@C Nanocomposites

[0041] 4.8g of polyvinylpyrrolidone was dissolved in a mixed solution of 110mL of absolute ethanol and secondary deionized water, and after it formed a clear solution, 2.6g of multi-walled carbon nanotubes with oxygen-rich functional groups on the surface were added to it for ultrasonication. Disperse, then stir to form a solution, then 2.1g C 4 h 6 CoO 4 Mixed with the above solution to obtain a mixed solution A. 2.0gC 10 h 6 o 8 Dissolve in a mixed solution of 110mL absolute ethanol and secondary deionized water to form a transparent solution B. Add solution B to solution A while stirring at a constant speed, place until the solution and precipitate are clearly separated, and then centrifuge to collect the black precipitate product. The product was washed with absolute ethanol to remove residual polyvinylpyrrolidone and C 4 h 6 o 4 2- , and then the obtained product was dried at 80 °C for 11 h to obtain the precur...

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Abstract

The invention discloses a preparation method of an MOFs coated high-conductivity multi-walled carbon nanotube composite material and application of the MOFs coated high-conductivity multi-walled carbon nanotube composite material in a potassium ion battery, one-dimensional linear MOFs based composite material precursor powder is prepared by using a simple room temperature liquid phase method, and then the one-dimensional linear high-conductivity MWCNTs-CoO@C nanosphere composite material is prepared by calcining in an inert atmosphere. The MOFs coated high-conductivity multi-walled carbon nanotube composite material prepared by the method has excellent potassium storage performance, high conductivity and structural stability, and can be used as a negative electrode material of a high-performance potassium ion battery. The potassium storage mechanism of the prepared MWCNTs-CoO@C nanosphere composite material is Co-O-Cx + 3K + + 3e- to Co + K2O + KCx and Co + K2O + KCx to Co-O-Cx + 3K + + 3e-. The preparation method disclosed by the invention is simple, green, pollution-free, relatively low in cost and easy for large-scale preparation.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for potassium ion batteries, and in particular relates to a preparation method of a MOFs-coated high-conductivity multi-wall carbon nanotube composite material and its application in potassium ion batteries. Background technique [0002] In recent years, the severe environmental pollution and the increasing energy crisis have made the development of large-scale energy storage grid systems more and more important. Among them, lithium-ion batteries have gradually become one of the more promising energy storage devices due to their high energy density and other characteristics. However, with the popularity of lithium-ion batteries as energy storage devices in daily life, the problems of less distribution of lithium resources and higher cost restrict their future development. On the contrary, potassium-ion batteries have attracted extensive attention of scientific researchers bec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M4/52H01M10/054B82Y30/00C08G83/00C01B32/168C01G51/04C01B32/05
CPCH01M4/366H01M4/625H01M4/523H01M10/054B82Y30/00C08G83/008C01B32/168C01G51/04C01B32/05H01M2004/021H01M2004/027C01B2202/06C01P2002/72C01P2004/03C01P2004/80Y02E60/10
Inventor 刘代伙张爽刘定毅陈忠伟杨林白正宇
Owner HENAN NORMAL UNIV
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