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Preparation method of lignin-based active carbon fiber for electrodes of supercapacitors

A technology of supercapacitor and activated carbon fiber, which is applied in hybrid capacitor electrodes, fiber chemical characteristics, rayon manufacturing, etc., can solve the problems of low energy density of activated carbon fiber, and achieve the effect of high energy density and low production cost.

Inactive Publication Date: 2018-01-19
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing lignin-based activated carbon fibers for supercapacitor electrodes, which solves the problem of low energy density of lignin-based activated carbon fibers at present

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: 0.5g of nano-manganese dioxide is added to 200ml of sodium alginate aqueous solution with a mass fraction of 0.5wt.%, ultrasonically dispersed for 30min (ultrasonic power 120W, ultrasonic frequency 40KHz) and then 1g of graphene oxide is added and stirred uniform. Subsequently, the pH value of the solution was adjusted to 11, and 97 g of purified lignin was added. Use a rotary evaporator at 80°C to obtain a lignin / graphene oxide / sodium alginate / manganese dioxide hybrid material; put the resulting hybrid material into a melt spinning machine and melt it at 200-230°C Spinning to obtain lignin / graphene oxide / sodium alginate / manganese dioxide hybrid fibers, wherein the size of the spinneret is 0.18mm×12f, and the spinning speed is 100m / min. The obtained hybrid fiber was placed in a high-temperature furnace, and the temperature was raised to 280°C at a rate of 0.01°C / min, and the temperature was kept constant for 1h; then the temperature was raised to 1000°C for ...

Embodiment 2

[0017] Example 2: 1g of nano-manganese dioxide was added to 200ml of 1wt.% sodium alginate aqueous solution, ultrasonically dispersed for 30min (ultrasonic power 120W, ultrasonic frequency 40KHz) and then 2g of graphene oxide was added and stirred evenly. Subsequently, the pH value of the solution was adjusted to 12, and 96 g of purified lignin was added. Use a rotary evaporator at 80°C to obtain a lignin / graphene oxide / sodium alginate / manganese dioxide hybrid material; put the resulting hybrid material into a melt spinning machine and melt it at 200-240°C Spinning to obtain lignin / graphene oxide / sodium alginate / manganese dioxide hybrid fibers, wherein the size of the spinneret is 0.18mm×12f, and the spinning speed is 500m / min. The obtained hybrid fiber was placed in a high-temperature furnace, and the temperature was raised to 280°C at a rate of 0.03°C / min, and the temperature was kept constant for 2 hours; then the temperature was raised to 1200°C for carbonization for 1 hou...

Embodiment 3

[0018] Example 3: 2g of nano manganese dioxide was added to 200ml of sodium alginate aqueous solution with a mass fraction of 2wt.%, ultrasonically dispersed for 30min (ultrasonic power 120W, ultrasonic frequency 40KHz) and then 4g of graphene oxide was added and stirred evenly. Subsequently, the pH value of the solution was adjusted to 11, and 90 g of purified lignin was added. Use a rotary evaporator at 80°C to obtain a lignin / graphene oxide / sodium alginate / manganese dioxide hybrid material; put the resulting hybrid material into a melt spinning machine and melt it at 210-250°C Spinning to obtain lignin / graphene oxide / sodium alginate / manganese dioxide hybrid fibers, wherein the size of the spinneret is 0.18mm×12f, and the spinning speed is 800m / min. The obtained hybrid fibers were placed in a high-temperature furnace, and the temperature was raised to 280°C at a rate of 0.03°C / min, and the temperature was kept constant for 3 hours; then the temperature was raised to 1000°C f...

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Abstract

The invention discloses a preparation method of lignin-based active carbon fiber for electrodes of supercapacitors. The preparation method comprises the following steps: adding nano-scale manganese dioxide into a sodium alginate aqueous solution, then adding graphene oxide after ultrasonic stirring, then regulating the pH value of the solution to be 10-11, adding purified lignin, and carrying outdecompression and rotary evaporation to obtain a hybridized material; adding the hybridized material into a melt spinning machine to carry out spinning at the temperature 200-250 DEG C, and obtaininghybridized fiber; putting the hybridized fiber in a high-temperature furnace, raising the temperature to 280-300 DEG C at the temperature raising rate of 0.01-3 DEG C / min, keeping the constant temperature for 1-6 hours; and then raising the temperature to 1000-2000 DEG C to carry out carbonization for 0.5-12 hours, thus obtaining the carbon fiber for the electrodes of the supercapacitors. The electrode prepared by the lignin-based active carbon fiber has the beneficial effects of low production cost and high energy density and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of activated carbon fibers, and relates to a method for preparing lignin-based activated carbon fibers used for supercapacitor electrodes. Background technique [0002] With the emergence and rapid development of smart clothing, it is particularly urgent to develop corresponding flexible, lightweight, and high-efficiency supercapacitors. The core issue is research and development of fibrous electrodes with high energy density and power density. At present, the electrodes of fibrous supercapacitors are mostly made of one-dimensional carbon nanotubes and two-dimensional graphene. The production cost is high, and it is difficult to produce on a large scale. The use of activated carbon fibers can effectively reduce the production cost of fibrous supercapacitor electrodes. As the precursor of activated carbon fibers, lignin has attracted much attention due to its advantages of renewable resources...

Claims

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Application Information

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IPC IPC(8): D01F9/17D01F1/10H01G11/40
CPCY02E60/13
Inventor 王世超唐建国黄林军王瑶王彦欣王薇李海东
Owner QINGDAO UNIV
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