Method for preparing graphene aerogel loaded tin dioxide composite material

A graphene aerogel, tin dioxide technology, applied in tin oxide, nanotechnology for materials and surface science, electrical components, etc., can solve the problems of reducing material capacity, particle pulverization and agglomeration, poor conductivity, etc. , to achieve the effect of simple preparation process, excellent electrical conductivity, and easy operation and control

Inactive Publication Date: 2014-11-12
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, tin dioxide has the same defects as other metal oxides: poor electrical conductivity, the volume expansion of tin dioxide particles is as high as 300% during charging and discharging, which can easily lead to powdering and agglomeration of particles, reducing the capacity of the material

Method used

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  • Method for preparing graphene aerogel loaded tin dioxide composite material
  • Method for preparing graphene aerogel loaded tin dioxide composite material
  • Method for preparing graphene aerogel loaded tin dioxide composite material

Examples

Experimental program
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Embodiment 1

[0030] Graphene oxide used in the present invention is to adopt traditional known process method to make, and its preparation method is as follows:

[0031] Potassium persulfate (K 2 S 2 o 8 ) 2.5 g, phosphorus pentoxide (P 2 o 5 ) 2.5 g, dissolved in 12 mL of concentrated sulfuric acid, heated to 80°C; then 3 g of natural graphite was added to the above solution, kept at 80°C for 4.5 hours; cooled to room temperature, diluted with 500 mL of deionized water, and left standing overnight ; filter, float residual acid with 0.2 mm filter; dry in a vacuum oven at 60°C; add the obtained preoxide to 120 mL of ice-bathed concentrated sulfuric acid, slowly add 15 g of KMnO under stirring 4 , Keep the temperature below 20°C during the addition process. Then the temperature was controlled at 35°C and stirred for 2 h. Add 250 mL of deionized water to dilute, and keep the temperature below 50°C in an ice bath during the dilution process. Stir for another 2 h, add 0.7 L of deionized ...

Embodiment 2

[0041] The preparation method of graphene oxide is the same as embodiment 1.

[0042] Preparation of graphene airgel-supported tin dioxide composites:

[0043] 1. Take 30 mL of graphene oxide solution (3 mg / mL) into a beaker, add 20 mL of deionized water and stir for 20 min to mix well, then sonicate for 1 h.

[0044] 2. Weigh 150 mg of tin tetrachloride and dissolve in 10 mL of deionized water, stir magnetically for 5 min, pour into the graphene oxide solution in step 1, stir magnetically for 2 h, and sonicate for 1 h.

[0045] 3. Measure 0.5 mL of 1-propylamine and pour it into the mixed solution in step 2, and stir magnetically for 1 h.

[0046] 4. Transfer the mixed solution into a hydrothermal reaction kettle and keep it at 180°C for 12 hours. After the reaction kettle drops to room temperature, take out the cylindrical product and wash it with alcohol and water for three times; The graphene airgel-supported tin dioxide composite material was obtained by freeze-drying o...

Embodiment 3

[0050] The preparation method of graphene oxide is the same as embodiment 1.

[0051] Preparation of graphene airgel-supported tin dioxide composites:

[0052] 1. Take 40 mL of graphene oxide solution (3 mg / mL) into a beaker, add 10 mL of deionized water and stir for 20 min to mix evenly, then sonicate for 2 h.

[0053] 2. Weigh 200 mg of stannous chloride and dissolve in 10 mL of deionized water, stir magnetically for 5 min, pour into the graphene oxide solution in step 1, stir magnetically for 1 h, and sonicate for 1 h.

[0054] 3. Measure 1 mL of urea and pour it into the mixed solution in step 2, and stir magnetically for 1 hour.

[0055] 4. Transfer the mixed solution into the reaction kettle and keep it at 120°C for 8 hours. After the reaction kettle drops to room temperature, take out the cylindrical product and wash it with alcohol and water three times; put the obtained cylindrical product into a freeze dryer at -52°C Freeze-dry overnight to obtain the graphene ai...

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Abstract

The invention relates to a method for preparing a graphene aerogel loaded tin dioxide composite material, belonging to the technical field of electrode materials of lithium ion batteries. The method mainly comprises the following steps: stirring and performing ultrasonic treatment on oxidized graphene and water-soluble tin salt in a mass ratio of (2:1)-(1:3), adding 0.1-2mL of an organic amine solution, transferring into a hydrothermal kettle, keeping for 6-24 hours at 80-180 DEG C, subsequently taking out a columnar product, and performing freeze-drying on the product so as to obtain the graphene aerogel loaded tin dioxide composite material. According to the graphene aerogel loaded tin dioxide composite material prepared by using the method, and thin graphene is cross-linked to form micron-order ducts, and the surface of the graphene is uniformly loaded with 3-6nm of tin dioxide grains. By adopting a three-dimensional structure, very good electrolyte wettability is achieved, the excellent conductivity of graphene is brought into full play, the growth of the tin dioxide grains is controlled, the negative effects caused by size increase are avoided, and the structural stability and the circulation property of the composite material as a negative electrode material are improved.

Description

technical field [0001] The invention relates to a preparation method of a lithium-ion battery negative electrode material, in particular to a preparation method of a graphene airgel-loaded tin dioxide composite material, which belongs to the technical field of lithium-ion battery electrode materials. Background technique [0002] With the development of society, environmental issues have increasingly become the focus of global attention. The environmental pollution caused by the use of fossil energy such as coal, oil, and natural gas has become increasingly serious. The greenhouse effect and PM2.5 have seriously exceeded the standard and brought huge damage to society. . For this reason, the development of new clean energy technologies has become the development strategic goal of governments of various countries. New energy mainly includes clean energy such as solar energy, wind energy, biomass energy, nuclear energy, and ocean tidal energy. These energy sources have the ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48C01G19/02B82Y30/00
CPCC01G19/02H01M4/48H01M4/625H01M10/0525Y02E60/10
Inventor 蒋永赵兵刘瑞喆高强王志轩陈勇陆孟娜焦正吴明红
Owner SHANGHAI UNIV
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