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Composites of multi-walled carbon nanotubes and prussian blue analogues

A technology of multi-walled carbon nanotubes and Prussian blue, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of insignificant improvement of material Coulombic efficiency, decrease of specific capacity, and side reactions Intensify and other problems, to achieve the effect of excellent shape, high specific capacity, and low cost

Inactive Publication Date: 2019-01-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the former can improve cycle stability and rate performance, the addition of conductive polymers will cause a decrease in the overall specific capacity and aggravate side reactions at high voltages. In addition, the improvement of the Coulombic efficiency of the material is not very obvious.

Method used

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  • Composites of multi-walled carbon nanotubes and prussian blue analogues
  • Composites of multi-walled carbon nanotubes and prussian blue analogues
  • Composites of multi-walled carbon nanotubes and prussian blue analogues

Examples

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preparation example Construction

[0024] The preparation method of the composite material of the multi-walled carbon nanotube of above-mentioned structure and Prussian blue analogue is characterized in that comprising the following steps:

[0025] (1). TNWDIS is used as the carbon nanotube water-based dispersant, and the mass ratio of the dispersant and the multi-walled carbon nanotube is (0.2-0.5): 1, and the dispersant and the multi-walled carbon nanotube are dissolved in deionized water, Stir to form a solution, and then sonicate for 20 to 30 minutes until the mixture is evenly mixed to obtain a mixed solution;

[0026] (2). Potassium ferrocyanide / sodium ferrocyanide, sodium chloride and manganese chloride are used as precursors for preparing Prussian blue analogs, with ferrocyanide and manganese chloride molar ratio 1:1, chlorine The mass ratio of manganese oxide to multi-walled carbon nanotubes (4.8-6.0): 1, the mass ratio of sodium chloride to deionized water (0.34-0.36): 1, potassium ferrocyanide / sodium...

Embodiment 1

[0030] Weigh 0.08g TNWDIS and 0.16g multi-walled carbon nanotubes, dissolve the mixture in 100ml of deionized water, stir and dissolve with a magnetic stirrer at a stirring speed of 300r / min to form a solution, and then use a 400W ultrasonic Sonicate for 20min to form mixed solution A.

[0031] Weigh 2.12g potassium ferrocyanide, 34g sodium chloride and 0.99g MnCl 2 , adding potassium ferrocyanide to mixed solution A, stirring for 30 minutes to form mixed solution B, adding sodium chloride to mixed solution B to form sodium chloride saturated solution C, and continuing to stir for 30 minutes. MnCl 2 Dissolve in 100ml deionized water, stir evenly, add dropwise to the above saturated solution C, stir for 24h to form a suspension.

[0032] Use a centrifuge with a centrifugal speed of 8000r / min to collect the solid material in the suspension, wash with deionized water for 3 times until there is no remaining sodium chloride in the product, and dry at a temperature of 80°C to obta...

Embodiment 2

[0035]Weigh 0.07g TNWDIS and 0.16g multi-walled carbon nanotubes, dissolve the mixture in 100ml of deionized water, stir and dissolve with a magnetic stirrer at a stirring speed of 300r / min to form a solution, and then use a 400W ultrasonic Sonicate for 30 min to form a mixed solution A.

[0036] Weigh 2.12g potassium ferrocyanide, 34g sodium chloride and 0.99g MnCl 2 , adding potassium ferrocyanide to mixed solution A, stirring for 30 minutes to form mixed solution B, adding sodium chloride to mixed solution B to form sodium chloride saturated solution C, and continuing to stir for 30 minutes. MnCl 2 Dissolve in 100ml deionized water, stir evenly, add dropwise to the above saturated solution C, stir for 24h to form a suspension.

[0037] Use a centrifuge with a centrifugal speed of 8000r / min to collect the solid material in the suspension, wash with deionized water for 3 times until there is no remaining sodium chloride in the product, and dry at a temperature of 100°C to o...

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Abstract

The invention relates to a composite material of a multi-walled carbon nanotube and a Prussian blue analogue. The preparation method comprises the following steps: adding an aqueous dispersant and themulti-walled carbon nanotube into deionized water to dissolve to obtain a mixed solution;- using potassium ferrocyanide / sodium ferrocyanide, sodium chloride and MnCl2- as precursors for the preparation of Prussian blue analogues, adding potassium ferrocyanide / sodium ferrocyanide into the mixed solution, adding sodium chloride / sodium citrate into the mixed solution to form a saturated solution ofsodium chloride / sodium citrate, dissolving MnCl2 in deionized water, and dropwise adding the saturated solution to form a suspension; collecting and drying solid materials in the suspension- to obtainthe composite of multi-walled carbon nanotubes and Prussian blue analogues. The composite of MWNTs and Prussian blue analogues was applied to the cathode of sodium ion battery.

Description

technical field [0001] The invention relates to the modification and modification of Prussian blue analog materials by using multi-walled carbon nanotubes, and belongs to the field of positive electrode materials of sodium ion batteries. Background technique [0002] Lithium-ion batteries have the characteristics of light weight, large capacity, wide operating temperature range, low self-discharge rate, no environmental pollution, no memory effect, etc., so they have been widely used. Many current digital devices use lithium-ion batteries as power sources, but the use of large-scale energy storage batteries in the future will cause a shortage of lithium resources and cause cost increases. [0003] Sodium and lithium are elements of the same main group, have similar chemical properties, and can be substituted for each other in some applications. Moreover, sodium is abundant in the earth and has a higher oxidation-reduction potential than lithium. And safety and other aspects...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054B82Y30/00
CPCB82Y30/00H01M4/366H01M4/58H01M4/625H01M10/054Y02E60/10
Inventor 赵乃勤毛乐佳刘恩佐师春生何春年
Owner TIANJIN UNIV
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