Preparation method of N-doped carbon/manganese dioxide composite electrode materials of porous communication network

A technology of nitrogen-doped carbon and manganese dioxide, which is used in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, can solve the problems of low conductivity and poor electrochemical performance of manganese dioxide, and achieve excellent performance and improved performance. Hydrophilic and conductive, dispersing effect is remarkable

Inactive Publication Date: 2018-09-14
XUZHOU COLLEGE OF INDAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The poor electrochemical performance of manganese dioxide due to its low conductivity

Method used

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  • Preparation method of N-doped carbon/manganese dioxide composite electrode materials of porous communication network
  • Preparation method of N-doped carbon/manganese dioxide composite electrode materials of porous communication network
  • Preparation method of N-doped carbon/manganese dioxide composite electrode materials of porous communication network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Disperse 5.7 g of ammonium persulfate in 50 mL of aqueous hydrochloric acid solution with a concentration of 1 mol / L to prepare an oxidant mixture, and refrigerate at 0°C for 0.5 h until use;

[0035] (2) Disperse 4.6g of silica sol (with a particle size of 20nm) in 50 mL of aqueous hydrochloric acid solution with a concentration of 1 mol / L, ultrasonically disperse for 0.5 h, and the ultrasonic frequency is 40 kHz;

[0036] (3) Add 2 mL of aniline to the silicon dioxide hydrochloric acid mixture in step (2), and disperse for 0.5 h with mechanical stirring at a stirring speed of 300 rpm and ultrasonic frequency at 40 kHz, and keep the temperature of the mixed liquid at 0°C.

[0037] (4) To the silica / aniline mixed solution in step (3), add dropwise the oxidant mixed solution in step (1) refrigerated for use; after the oxidant mixed solution has been added dropwise, mechanically Stirring and ultrasonic frequency of 40 kHz were used to disperse for 2 h, and the temper...

Embodiment 2

[0043] On the basis of the preparation in Example 1, the amount of silica sol was adjusted to: 2.3g;

[0044] The nitrogen-doped carbon material of the porous interconnection network prepared in this embodiment is marked as N-C (1:1), and its scanning electron microscope picture is shown in image 3 .

[0045] After high temperature carbonization and alkali etching, from image 3 The obtained nitrogen-doped carbon material is fiber-type, and many protrusions are formed on the surface of the fiber.

Embodiment 3

[0047] On the basis of the preparation of Example 1, the amount of silica sol was adjusted to: 6.9g;

[0048] The nitrogen-doped carbon material of the porous interconnection network prepared in this embodiment is marked as N-C (3:1), and its scanning electron microscope picture is shown in Figure 4 , the obtained nitrogen-doped carbon material is an irregular spherical shape, and the surface of the spherical shape contains holes of different sizes.

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Abstract

The present invention discloses a preparation method of N-doped carbon / manganese dioxide composite electrode materials of a porous communication network. The method concretely comprises the followingsteps of: in an acidic aqueous solution, preparing and obtaining silicon dioxide / conducting polymer composite materials through in-situ polymerization; performing high-temperature pyrolysis and alkaline etching to obtain the N-doped carbon materials of the porous communication network; and regulating the concentration of potassium permanganate to obtain N-doped carbon / manganese dioxide composite electrode materials of the porous communication network. The silicon dioxide sol used in the invention provides a template effect, the dosage or the particle diameter of the silicon dioxide is regulated to achieve controllability of a porous material structure. The prepared N-doped carbon / manganese dioxide composite electrode materials of the porous communication network are good in mechanical stability, electrical conductivity and cycling stability.

Description

technical field [0001] The invention relates to the field of preparation of electrode materials for supercapacitors, in particular to a method for preparing a nitrogen-doped carbon / manganese dioxide composite electrode material with a porous interconnected network. Background technique [0002] Supercapacitor, as a new type of energy storage device, has been widely used in hybrid electric vehicles and portable electronic devices due to its high power density, long service life and fast charge and discharge speed, and has become a research hotspot in recent years. [0003] Electrode material is one of the core components of supercapacitors, which must have the characteristics of high specific capacity and good mechanical stability. Manganese dioxide has become an ideal electrode material for supercapacitors because of its Faraday pseudocapacitive characteristics, abundant resources, low price, and environmental friendliness. It is a promising green energy material. Manganese...

Claims

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Application Information

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IPC IPC(8): H01G11/24H01G11/30H01G11/38H01G11/46H01G11/86
CPCH01G11/24H01G11/30H01G11/38H01G11/46H01G11/86Y02E60/13
Inventor 李培培张达志徐云慧赵桂英倪才华汪庆夏港宁
Owner XUZHOU COLLEGE OF INDAL TECH
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