Preparation method for MnO2/C composite fibres

A composite fiber and hybrid fiber technology, which is applied in fiber processing, fiber chemical characteristics, hybrid/electric double layer capacitor manufacturing, etc., can solve problems such as application limitations and poor conductivity, and achieve simple preparation methods, high specific capacitance, and surface distribution. uniform effect

Inactive Publication Date: 2016-09-07
NANJING GUOXUAN BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As an electrode material for supercapacitors, manganese dioxide is inexpensive, has excellent capacitive performance, and is environmentally friendly, but MnO 2 The conductivity is poor, making MnO 2 applications are limited

Method used

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  • Preparation method for MnO2/C composite fibres
  • Preparation method for MnO2/C composite fibres
  • Preparation method for MnO2/C composite fibres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Preparation of SiO 2 / PAN / PVP mixed fiber: Dissolve 0.76g PVP in 4mL DMF solution and stir until uniform. 1.52g of SiO 2 Add to 4mL DMF solution, ultrasonic for 1h to make SiO 2 Disperse evenly, add it to PVP DMF (4mL) solution, stir and mix well. Add 0.76g PAN to the above mixture in portions and stir for 4-5h until a transparent colloid is formed. The above mixture was injected into a 10 mL syringe equipped with a needle with an inner diameter of 6 mm and placed on an electrospinning machine with a voltage of 15 kV, a distance of 15 cm between the needle and the receiving plate, and a spray speed of 0.2 mm / min for electrostatic spinning.

[0029] 2. Preparation of SiO 2 / C fiber: take the SiO prepared above 2 The / PAN / PVP mixed fiber was placed in a vacuum tube furnace, and nitrogen was introduced for 20 minutes in advance, and a heating program was set to 1°C / min to 250°C for 1 hour, and 5°C / min to 800°C for 2 hours to obtain a black fiber membrane.

[0030] 3. Prepar...

Embodiment 2

[0033] 1. Preparation of SiO 2 / PAN / PVP mixed fiber: Dissolve 0.76g PVP in DMF solution and stir until uniform. 1.52g of SiO 2 Add to 4mL DMF solution, ultrasonic for 1h to make SiO 2 Disperse evenly, add it to PVP DMF (4mL) solution, stir and mix well. Add 0.76g PAN to the above mixture in portions and stir for 4-5h until a transparent colloid is formed. The above mixture was injected into a 10 mL syringe equipped with a needle with an inner diameter of 6 mm and placed on an electrospinning machine with a voltage of 15 kV, a distance of 15 cm between the needle and the receiving plate, and a spray speed of 0.2 mm / min for electrospinning.

[0034] 2. Preparation of SiO 2 / C fiber: take the SiO prepared above 2 The / PAN / PVP mixed fiber was placed in a vacuum tube furnace, and nitrogen was introduced for 20 minutes in advance, and a heating program was set to 1°C / min to 250°C for 1 hour, and 5°C / min to 800°C for 2 hours to obtain a black fiber membrane.

[0035] 3. Preparation of ni...

Embodiment 3

[0038] 1. Preparation of SiO 2 / PAN / PVP mixed fiber: Dissolve 0.76g PVP in DMF solution and stir until uniform. 1.52g of SiO 2 Add to 4mL DMF solution, ultrasonic for 1h to make SiO 2 Disperse evenly, add it to PVP DMF (4mL) solution, stir and mix well. Add 0.76g PAN to the above mixture in portions and stir for 4-5h until a transparent colloid is formed. The above mixture was injected into a 10 mL syringe equipped with a needle with an inner diameter of 6 mm and placed on an electrospinning machine with a voltage of 15 kV, a distance of 15 cm between the needle and the receiving plate, and a spray speed of 0.2 mm / min for electrospinning.

[0039] 2. Preparation of SiO 2 / C fiber: take the SiO prepared above 2 The / PAN / PVP mixed fiber was placed in a vacuum tube furnace, and nitrogen was introduced for 20 minutes in advance, and a heating program was set to 1°C / min to 250°C for 1 hour, and 5°C / min to 800°C for 2 hours to obtain a black fiber membrane.

[0040] 3. Preparation of ni...

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Abstract

The invention discloses a preparation method for MnO2/C composite fibres. The preparation method comprises the following steps: dissolving SiO2 in DMF (Dimethyl Formamide) solution, dispersing the SiO2 uniformly by ultrasound, then, adding PVP (Polyvinyl Pyrrolidone) and PAN (Polyacrylonitrile), stirring uniformly to obtain a spinning solution, and performing electrostatic spinning on the spinning solution to obtain SiO2/PAN/PVP mixture fibres; calcining the SiO2/PAN/PVP mixture fibres in a vacuum tube furnace to obtain SiO2/C fibres; soaking the SiO2/C fibres in a NaOH solution of, and washing and drying the soaked SiO2/C fibres to obtain nitrogen-doped porous fibres; adding the nitrogen-doped porous fibres to an acidic KMnO4 solution in an ice bath to obtain MnO2/C composite fibres. The MnO2/C composite fibres prepared by the preparation method have the diameters of 1mm and have high specific capacitance, and serve as a super-capacitor electrode material; SiO2-removed hollow structures are formed in the MnO2/C composite fibres.

Description

Technical field [0001] The invention relates to a preparation method of a metal oxide and carbon fiber composite electrode material applied to supercapacitors, in particular to a MnO 2 / C Preparation method of composite fiber. Background technique [0002] As a new type of green and pollution-free energy storage device, supercapacitors have attracted wide attention due to their high energy density and power density, and excellent cycle performance. Each type of electrode material has its advantages and disadvantages. In general, carbon materials exhibit high power density and long cycle life, but have low specific capacitance. However, transition metal oxides provide higher energy density materials than carbon and better cycle stability than polymer materials, but have the disadvantage of poor electrical conductivity. With this in mind, in combination with the above, a mixture of transition metal oxide and porous carbon has been developed. [0003] As an electrode material for s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F8/18D01F9/10D01F11/00D01D5/00D01D5/30H01G11/86
CPCY02E60/13D01F8/18D01D5/003D01D5/0092D01D5/30D01F9/10D01F11/00H01G11/86
Inventor 倪向颖朱庆俊姚汪兵
Owner NANJING GUOXUAN BATTERY CO LTD
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