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Preparation method of nano-mno2 composite electrode for high conductivity supercapacitor

A technology for supercapacitors and composite electrodes, which is applied in the field of preparation of nano-MnO2 composite electrodes for high-conductivity supercapacitors. It can solve the problems of high theoretical specific capacity characteristics, poor cycle reversibility, and difficulty in uniform dispersion. It is beneficial to industrialization Large-scale production, low equipment requirements, and low cost effects

Inactive Publication Date: 2016-01-06
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, MnO 2 It is a semiconductor with low conductivity and poor cycle reversibility, which seriously limits the electrode material used as a supercapacitor charge and discharge performance
Therefore, when manganese dioxide is used as an electrode material to prepare an electrode, there is a shortcoming that it must be supplemented by adding a conductive material to make up for its poor conductivity.
[0004] MnO 2 As an active material for supercapacitor electrodes, it has the characteristics of high theoretical specific capacity, but due to its low electrical conductivity, it is difficult to exert its high theoretical specific capacity.
In order to improve MnO 2 Electrode conductivity, the existing process methods are all based on MnO 2 The powder is mixed with high conductivity material to improve MnO 2 The purpose of electrode conductivity, but the mixed high conductivity material is difficult to disperse evenly in the electrode, cannot form electron diffusion channels, and cannot better improve MnO 2 Electrode conductivity

Method used

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  • Preparation method of nano-mno2 composite electrode for high conductivity supercapacitor
  • Preparation method of nano-mno2 composite electrode for high conductivity supercapacitor
  • Preparation method of nano-mno2 composite electrode for high conductivity supercapacitor

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Take 5g of multi-walled carbon nanotubes, add them to the mixed acid of sulfuric acid and nitric acid with a molar ratio of 3:1, use an ultrasonic cleaner to sonicate for 30min, heat to 60°C and centrifuge for 1h, then dilute with deionized water after acidification treatment The multi-walled carbon nanotubes were centrifuged at 8000 rpm for 10 minutes, washed repeatedly with deionized water until the pH value of the supernatant was 7, and then the multi-walled carbon nanotubes were taken out and dried for later use; 1g of acid-washed multi-walled carbon nanotubes Carbon nanotubes were dispersed into 1L of deionized water by ultrasound, and a small amount of Na was added 2 SO 4 Configured as 0.1g / L electrolyte. Use 100 mesh stainless steel mesh electrodes as cathode and anode, add 0.3V / cm between cathode and anode 2 DC voltage, deposited for 10min, obtained stainless steel mesh with multi-walled carbon nanotubes; weighed 0.1molMnSO 4 and 0.05molH 2 SO 4 , adding mo...

Embodiment 2

[0022] Take 5g of multi-walled carbon nanotubes, add them to the mixed acid of sulfuric acid and nitric acid with a molar ratio of 3:1, use an ultrasonic cleaner to sonicate for 30min, heat to 60°C and centrifuge for 1h, then dilute with deionized water after acidification treatment The multi-walled carbon nanotubes were centrifuged at 8000 rpm for 10 minutes, washed repeatedly with deionized water until the pH value of the supernatant was 7, and then the multi-walled carbon nanotubes were taken out and dried for later use; 1g of acid-washed multi-walled carbon nanotubes Carbon nanotubes were dispersed into 1L of deionized water by ultrasound, and a small amount of Na was added 2 SO 4 Configured as 0.15g / L electrolyte. Use 100 mesh stainless steel mesh electrodes as cathode and anode, add 0.05V / cm between cathode and anode 2 The DC voltage was deposited for 30 minutes to obtain a stainless steel mesh adsorbed with multi-walled carbon nanotubes; weigh 0.1mol of MnNO 3 and 0....

Embodiment 3

[0024] Take 5g of multi-walled carbon nanotubes, add them to the mixed acid of sulfuric acid and nitric acid with a molar ratio of 3:1, use an ultrasonic cleaner to sonicate for 30min, heat to 60°C and centrifuge for 1h, then dilute with deionized water after acidification treatment The multi-walled carbon nanotubes were centrifuged at 8000 rpm for 10 minutes, washed repeatedly with deionized water until the pH value of the supernatant was 7, and then the multi-walled carbon nanotubes were taken out and dried for later use; 1g of acid-washed multi-walled carbon nanotubes Carbon nanotubes were dispersed into 1L of deionized water by ultrasound, and a small amount of Na was added 2 SO 4 Configured as 0.2g / L electrolyte. Use 100 mesh stainless steel mesh electrodes as cathode and anode, add 1V / cm between cathode and anode 2 The DC voltage was deposited for 50 minutes to obtain a stainless steel mesh adsorbed with multi-walled carbon nanotubes; weigh 0.1mol of MnNO 3 and 0.05mo...

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Abstract

A kind of preparation method of nano-MnO2 composite electrode for supercapacitor with high conductivity, its step is: take multi-walled carbon nanotube, add in the mixed acid of sulfuric acid and nitric acid that molar ratio is 3:1, heat to 60 ℃ and centrifugal stirring, Repeatedly washing with deionized water until the pH of the supernatant is 7, drying the multi-walled carbon nanotubes for later use. Prepare the electrolyte solution with a concentration of 0.1g / L-2g / L. Using stainless steel mesh electrodes as cathode and anode, applying a DC voltage of 0.05-1V / cm2 between the cathode and anode, depositing for 10-50min, and obtaining stainless steel mesh adsorbed with multi-walled carbon nanotubes. Configure 0.1mol / L MnSO4 or MnNO3 solution as electrolyte. Take the above-mentioned stainless steel net to make an electrode, use it as the positive electrode, and the platinum electrode as the negative electrode, conduct electrodeposition under a constant current of 0.5-50mA / cm2, keep the temperature at 90°C, and obtain a nano-MnO2 composite electrode after deposition for 5-30min; The invention can conveniently and accurately control parameters such as the current density of the electrolytic cell, the electrolysis time, the type, composition, concentration, and pH value of the electrolyte, and the control is simple; it also has the advantages of simple operation and low cost.

Description

technical field [0001] The invention relates to a kind of nanometer MnO for supercapacitor with high conductivity 2 Preparation method of composite electrode. Background technique [0002] With the rapid development of the world economy, oil resources are becoming increasingly scarce, environmental pollution is becoming more and more serious, and the demand for renewable and environmentally friendly power sources is growing rapidly. Supercapacitors are a new type of green energy storage device that has developed rapidly this year. It has the characteristics of high energy, high power, and long life. It has the characteristics of wide operating temperature, high reliability, and fast charge and discharge. [0003] The research on manganese oxide supercapacitor electrode materials has become one of the research hotspots in the field of supercapacitors. Manganese oxides have attracted much attention due to their advantages of multi-valence, high theoretical specific capacitan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/86B82Y40/00
CPCY02E60/13
Inventor 华小珍肖可周贤良叶志国段祺舜
Owner NANCHANG HANGKONG UNIVERSITY