Preparation method of MnO2/graphite fiber super capacitor electrode materials

A technology of graphene fibers and supercapacitors, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve the problems of low specific capacitance, limited potential applications, and low energy density of capacitor devices, so as to improve the specific capacitance , high specific capacity, excellent specific capacitance effect

Inactive Publication Date: 2017-07-21
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure graphene fiber materials usually have low specific capacitance value, and capacitor devices have low energy density, which limits its wide potential applications.

Method used

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  • Preparation method of MnO2/graphite fiber super capacitor electrode materials
  • Preparation method of MnO2/graphite fiber super capacitor electrode materials
  • Preparation method of MnO2/graphite fiber super capacitor electrode materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Concentrate the graphene oxide aqueous dispersion by centrifugation, and then ultrasonically treat it for 30 minutes to obtain a graphene oxide spinning solution;

[0029] (2) Use a syringe pump to inject the graphene oxide spinning solution into the 2 In the coagulation bath composed of / ethanol solution, after immersing in the coagulation bath for 20min, the obtained fiber was repeatedly washed 3 times with deionized water and ethanol, and the residual coagulation solution was washed away, so as to obtain graphene oxide fiber and collect it on the support , drying the collected fibers at high temperature under vacuum conditions;

[0030] (3) The graphene oxide fibers were reduced in hydroiodic acid at 90 °C for 12 h, and then 2 / Ar (volume ratio 1:1) in a reducing atmosphere of 1000 ° C thermal reduction, natural cooling to room temperature and then take out the fiber to prepare graphene fiber;

[0031] (4) Mix manganese sulfate, potassium permanganate and water...

Embodiment 2

[0034] (1) Concentrate the graphene oxide aqueous dispersion by centrifugation, and then ultrasonically treat it for 30 minutes to obtain a graphene oxide spinning solution;

[0035] (2) Use a syringe pump to inject the graphene oxide spinning solution into the 2 In the coagulation bath composed of / ethanol solution, after immersing in the coagulation bath for 30min, the obtained fiber was repeatedly washed 3 times with deionized water and ethanol, and the residual coagulation solution was washed away, so as to obtain graphene oxide fiber and collect it on the support , drying the collected fibers at high temperature under vacuum conditions;

[0036] (3) The graphene oxide fibers were reduced in hydroiodic acid at 120 °C for 8 h, and then 2 / Ar (volume ratio 1:4) in a reducing atmosphere of 1000 ° C thermal reduction, natural cooling to room temperature and then take out the fiber to prepare graphene fiber;

[0037] (4) Mix manganese sulfate, potassium permanganate and water...

Embodiment 3

[0040](1) Concentrate the graphene oxide aqueous dispersion by centrifugation, and then ultrasonically treat it for 20 minutes to obtain a graphene oxide spinning solution;

[0041] (2) Use a syringe pump to inject the graphene oxide spinning solution into the 2 In the coagulation bath composed of / ethanol solution, after immersion in the coagulation bath for 30min, the obtained fiber was repeatedly washed 5 times with deionized water and ethanol, and the residual coagulation solution was washed away, so as to obtain graphene oxide fiber and collect it on the support , drying the collected fibers at high temperature under vacuum conditions;

[0042] (3) The graphene oxide fibers were reduced in hydroiodic acid at 110 °C for 10 h, and then 2 / Ar (volume ratio 1:2) in a reducing atmosphere of 1000 ° C thermal reduction, natural cooling to room temperature and then take out the fiber to prepare graphene fiber;

[0043] (4) Mix manganese sulfate, potassium permanganate and water...

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Abstract

The invention discloses a preparation method of MnO2/graphite fiber super capacitor electrode materials. The method comprises steps of carrying out reduction-oxidation on graphite to obtain graphite fibers; and wrapping and growing MnO2 nano lines on the surfaces of the graphite fibers. The micro-structure of the prepared MnO2/graphite fiber super capacitor electrode material is MnO2 nano-line wrapped graphite fibers. The MnO2 nano lines are interlaced with each other to form many communicating space hole structures. Thus, a quite big specific surface area is achieved; the specific surface area and the space utilization rate of the electrode are effectively improved; and the specific capacitance, the rate performance and the electrochemical stability of the electrode materials are improved. The specific capacitance value of the prepared electrode material can reach 64.4-105.3F g<-1> in a three-electrode system test. The preparation method is advantaged by simplicity and low cost.

Description

technical field [0001] The invention relates to the field of supercapacitors, in particular to a supercapacitor electrode material and a preparation method thereof. Background technique [0002] With the rapid development of the global economy, the continuous consumption of fossil energy, and the increasing environmental pollution, it is becoming more and more important to study a high-efficiency, low-cost, environmentally friendly, and high-performance energy conversion and storage system. Supercapacitors have attracted much attention due to their high energy rate density, wide operating temperature range, long life, and environmental friendliness. It has important and broad application prospects and has become a research hotspot all over the world. [0003] Supercapacitor is a kind of electrochemical capacitor, which can be divided into two types according to the charge storage mechanism: one type of electrochemical double layer capacitor, the electrode material of this...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/46H01G11/32H01G11/86
CPCY02E60/13H01G11/46H01G11/32H01G11/86
Inventor 吕建国王伟成
Owner ZHEJIANG UNIV
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