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A kind of preparation method of three-dimensional graphene composite electrode material with high mechanical strength

A graphene composite, mechanical strength technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as being unsuitable for large-scale production, unsuitable for long-term development, and unsuitable reaction conditions, achieving good reduction performance, electrochemical Good performance and improved mechanical properties

Inactive Publication Date: 2017-10-17
邯郸市华源炭素有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because the chemical properties of electrochemically active materials are relatively active, they need to be prepared under relatively mild conditions. The reaction conditions of high temperature and high pressure are not suitable, and reagents such as hydrazine hydrate have greater toxicity and irritation. Therefore, This method is not suitable for large-scale production, nor is it suitable for long-term development

Method used

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  • A kind of preparation method of three-dimensional graphene composite electrode material with high mechanical strength
  • A kind of preparation method of three-dimensional graphene composite electrode material with high mechanical strength

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First dilute the graphene oxide hydrogel with deionized water to prepare a 2 mg / mL graphene oxide dispersion, adjust the pH of the dispersion to 9.0; then add sodium sulfite and potassium permanganate to the graphene oxide colloidal dispersion , so that the concentrations of sodium sulfite and potassium permanganate were 0.1mg / mL and 0.3mg / mL respectively, adjust the pH of the dispersion to 9.0; stir for 5 minutes, ultrasonic for 10 minutes, and stand in a water bath at 50°C for 30 minutes; filter , washing with water, and drying to obtain a three-dimensional graphene electrode material. The conductivity tester test shows that the conductivity of graphene oxide before reduction is 6.7x10 -6 S / m, the conductivity of the electrode material after reduction is 2.0x10 2 S / m; can withstand the pressure of 7.8KPa.

Embodiment 2

[0025] Dilute the graphene oxide hydrogel with deionized water to prepare a 4 mg / ml graphene oxide dispersion, adjust the pH of the dispersion to 9.5; then add sodium dithionite and potassium ferrate to the graphene oxide colloid dispersion In the solution, the concentrations of sodium dithionite and potassium ferrate were 0.25 mg / mL and 0.4 mg / mL respectively, and the pH of the dispersion was adjusted to 9.5; stirred for 5 minutes, ultrasonicated for 10 minutes, and left to stand for 30 minutes in a water bath at 80°C Obtain the electrode material of three-dimensional graphene after filtering, washing with water and drying. The conductivity tester test shows that the conductivity of graphene oxide before reduction is 6.7x10 -6 S / m, the conductivity of the electrode material after reduction is 3.4x10 2 S / m; can withstand the pressure of 7KPa.

Embodiment 3

[0027] Dilute the graphene oxide hydrogel with deionized water to prepare a 4 mg / mL graphene oxide dispersion, adjust the pH of the dispersion to 9.5; then add potassium sulfide and potassium permanganate to the graphene oxide colloidal dispersion In the process, the concentrations of potassium sulfide and potassium permanganate were 0.2mg / mL and 0.3mg / mL respectively, and the pH of the dispersion was adjusted to 9.5, stirred for 5 minutes, ultrasonicated for 10 minutes, and left to stand in a water bath at 90°C for 30 minutes; The three-dimensional graphene electrode material is obtained after filtering, washing with water and drying. The conductivity tester test shows that the conductivity of graphene oxide before reduction is 6.7x10 -6 S / m, the conductivity of the electrode material after reduction is 3.2x10 2 S / m; can withstand the pressure of 10KPa.

[0028] figure 2 It is the SEM figure of the material obtained in this embodiment. As can be seen from the figure (a),...

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Abstract

The invention discloses a preparation method of a three-dimensional graphene composite electrode material with high mechanical strength. The preparation method comprises the steps of dispersing oxidized graphene in water to obtain a dispersion solution with the oxidized graphene concentration of 1-20 mg / mL, and adjusting the pH of the solution to be 8.0-14.0; then adding a transition metal compound such that the concentration of the transition metal compound is 0.1-10 mg / mL, and adjusting the pH of the solution to be 8.0-14.0; then adding sulfur-containing inorganic salt such that the concentration of the sulfur-containing inorganic salt is 0.05-0.8 mg / mL, and adjusting the pH of the solution to be 8.0-14.0; and finally allowing the dispersion solution to stand for 10-180 min in water bath at the temperature of 35-100 DEG C, filtering, washing and drying the diffusion solution, and thus obtaining the three-dimensional graphene composite electrode material with high mechanical strength. The method is short in reaction time, mild in conditions, low in toxicity, low in pollution and low in cost.

Description

technical field [0001] The invention belongs to the technical field of photoelectric materials, and in particular relates to a preparation method of a three-dimensional graphene composite electrode material with high mechanical strength. Background technique [0002] Three-dimensional graphene materials have a unique three-dimensional network structure, which can better improve the electrical conductivity and mechanical properties of composite materials compared with two-dimensional graphene materials. The study found that when the amount of three-dimensional graphene added was 0.5%wt, the conductivity of the composite material could reach 100 S / m, which was nearly 6 times higher than that of the composite material with the same amount of two-dimensional graphene added under the same conditions. At the same time, three-dimensional graphene materials have good flexibility and stability, and the resistance changes little under bending and stretching conditions. When the tensi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/62
CPCH01M4/362H01M4/625H01M2004/021Y02E60/10
Inventor 余柯涵韦玮陶云祥谈晓文
Owner 邯郸市华源炭素有限公司