Graphene in-situ load needle-shaped Co3O4 composite electrode material and manufacturing method thereof

A composite electrode and graphene technology, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double layer capacitors, can solve the problems of poor cycle performance and poor conductivity, and achieve the effect of improving cycle life and good electrochemical performance.

Inactive Publication Date: 2014-08-13
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its poor conductivity and poor cycle performance, it is of great value to solve this problem for the preparation of capacitor electrode materials.

Method used

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  • Graphene in-situ load needle-shaped Co3O4 composite electrode material and manufacturing method thereof
  • Graphene in-situ load needle-shaped Co3O4 composite electrode material and manufacturing method thereof
  • Graphene in-situ load needle-shaped Co3O4 composite electrode material and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Preparation of graphene oxide

[0034] With 5.0g natural graphite powder, 5.0g potassium persulfate (K 2 S 2 o 8 ) and 10.0g phosphorus pentoxide (P 2 o 5 ) into 33mL of concentrated sulfuric acid in sequence, and kept at 80°C for 6h; cooled to room temperature, diluted with deionized water, filtered and washed until the pH was 7, and then vacuum-dried at 80°C overnight. Weigh pre-oxidized graphite 2.5g, potassium permanganate (KMnO 4 ) 7.5g into 40mL concentrated sulfuric acid at 0°C in turn, first keep warm at below 20°C for 2.5h, keep stirring at about 35°C for 3.5h, then add about 80mL of deionized water, keep stirring at 95°C for 1.5h, and finally add the weight percentage 30%H 2 o 2 After reacting for half an hour, it was observed that the color of the mixed solution turned bright yellow, indicating that the reaction was complete. The above mixture was filtered and washed three times with dilute hydrochloric acid with a mass fraction of 10% to remove m...

Embodiment 2

[0040] (1) Preparation of graphene oxide

[0041] With 5.0g natural graphite powder, 15.0g potassium persulfate (K 2 S 2 o 8 ) and 5.0g phosphorus pentoxide (P 2 o 5 ) into 32mL of concentrated sulfuric acid in turn, and kept at 60°C for 7h; cooled to room temperature, diluted with deionized water, filtered and washed until the pH was 7, and then vacuum-dried at 80°C overnight. Weigh pre-oxidized graphite 2.5g, potassium permanganate (KMnO 4 ) 15g into 85mL of concentrated sulfuric acid at 0°C in turn, first keep warm at 5°C for 2.5h, then keep warm at about 35°C for 2h, then add about 170mL of deionized water, keep warm at 95°C for 1.5h, and finally add 30% by weight h 2 o 2 After reacting for half an hour, it was observed that the color of the mixed solution turned bright yellow, and the reaction was completed at this time. The above mixture was filtered and washed three times with dilute hydrochloric acid with a mass fraction of 15% to remove metal ions; then washed...

Embodiment 3

[0046] (1) Preparation of graphene oxide

[0047] With 5.0g natural graphite powder, 10.0g potassium persulfate (K 2 S 2 o 8 ) and 5.0g phosphorus pentoxide (P 2 o 5 ) into 25 mL of concentrated sulfuric acid in sequence, and kept at 85°C for 4h; cooled to room temperature, diluted with deionized water, filtered and washed until the pH was 7, and then vacuum-dried at 80°C overnight. Weigh pre-oxidized graphite 2.5g, potassium permanganate (KMnO 4 ) 7.5g was added to 115mL concentrated sulfuric acid at 0°C in turn, first kept at 18°C ​​for 1h, then stirred at 35°C for 2h, then added about 230mL of deionized water, kept at 95°C for 1.5h, and finally added 30% H by weight 2 o 2 until the reaction is complete. The above mixture was filtered and washed three times with dilute hydrochloric acid with a mass fraction of 10% to remove metal ions; then washed three times with deionized water to remove excess acid; then dispersed in 800mL deionized water and ultrasonically treated...

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Abstract

The invention discloses a graphene in-situ load needle-shaped Co3O4 composite electrode material and a manufacturing method of the graphene in-situ load needle-shaped Co3O4 composite electrode material. Single-layer graphene with needle-shaped Co3O4 growing on the edge or two faces is adopted as a load frame of the composite electrode material, the plane size of a nanosheet layer is one micron to 50 microns, and the manufacturing method comprises the steps that graphite oxide is manufactured through a modified Hummers method, then ultrasonic treatment is carried out to obtain graphene oxide, a precursor of the composite electrode material is manufactured through the graphene oxide, and the precursor is annealed in inert atmosphere to obtain the composite electrode material. The manufacturing method of the composite electrode material is simple and environmentally friendly, according to the typical structure of the composite electrode material, the needle-shaped Co3O4 is combined with the surface or the side face of the graphene, a quasi two-dimensional nano structure is formed, the graphene sheet layer can be loaded with the needle-shaped Co3O4 in situ, the cycle life of the Co3O4 is prolonged, and the specific capacitance and other good electrochemical performance are improved.

Description

technical field [0001] Embodiments of the present invention relate to a graphene two-dimensional composite material as a supercapacitor, more specifically, an embodiment of the present invention relates to a graphene in situ loaded needle-like Co by hydrothermal synthesis 3 o 4 A composite electrode material and a preparation method thereof belong to the field of energy materials. Background technique [0002] In recent years, with the emergence of a series of problems such as massive energy consumption, increasingly serious environmental pollution, and the global greenhouse effect, exploring clean and sustainable new energy has become the focus of scientific and technological personnel in various countries. At present, new energy mainly includes wind energy, solar energy, nuclear energy, hydrogen energy, etc., but their discontinuity and instability characteristics hinder their development, so it is urgent to find an energy storage device to solve this problem. Supercapac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/36H01G11/46H01G11/86
Inventor 王斌官群程建丽聂福德李小东倪伟杨光成
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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