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Preparation method and application of three-dimensional-structure graphene-base metal oxide composite material

A three-dimensional structure and composite material technology, applied in the fields of materials science and electrochemistry, can solve problems such as poor conductivity, achieve the effects of inhibiting agglomeration, increasing capacity, and improving cycle stability

Inactive Publication Date: 2013-10-09
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But TiO 2 The conductivity itself is poor, so improving the volume effect of metal oxides and improving conductivity is a hot topic in the study of lithium-ion battery anode materials this year.

Method used

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  • Preparation method and application of three-dimensional-structure graphene-base metal oxide composite material
  • Preparation method and application of three-dimensional-structure graphene-base metal oxide composite material
  • Preparation method and application of three-dimensional-structure graphene-base metal oxide composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The first step is to prepare graphene-based tin dioxide nanosheets:

[0051] (1) Ultrasonic 1 mg / mL graphene oxide in dimethylformamide solution (100 mL) to form a well-mixed dispersion;

[0052] (2) Add 25 mL of water and hydrochloric acid to the above dispersion to adjust the pH of the solution to 3; add tin tetrachloride (SnCl) under vigorous stirring. 4 ·5H 2 O), after adding, keep at 80℃ for 12h, and cool;

[0053] Among them, the added SnCl 4 ·5H 2 The mass dosage ratio of O to graphene oxide is 2.26:1.

[0054] (3) Centrifuge the above-reacted solution, wash with deionized water, repeat the centrifugation and washing operations three times, and concentrate to a viscous liquid of 5 mg / mL, which is graphene-based tin dioxide nanosheets. TEM images of tin dioxide nanosheets are as follows figure 1 shown.

[0055] The second step is to prepare the graphene-based tin dioxide aerogel with three-dimensional structure:

[0056] (1) Add 1 mL of PVA aqueous solutio...

Embodiment 2

[0062] The first step, preparation of three-dimensional graphene-based titanium dioxide

[0063] (1) Ultrasonic 1 mg / mL graphene oxide in dimethylformamide solution (100 mL) to form a well-mixed dispersion;

[0064] (2) Add 25 mL of water and concentrated sulfuric acid to the above dispersion to adjust the pH of the solution to 1; add tetrabutyl titanate (TBT) in an ice-water bath and under vigorous stirring, keep at 80°C for 12 hours after adding, and cool;

[0065] Wherein, the mass dosage ratio of added TBT to graphene oxide is 1.5:1.

[0066] (3) Centrifuge the above-reacted solution, wash with deionized water, repeat the centrifugation and washing operations three times, and concentrate into a viscous liquid of 5 mg / mL, which is graphene-based titanium dioxide nanosheets.

[0067] The second step is to prepare a graphene-based titanium dioxide aerogel with a three-dimensional structure:

[0068] (1) Add 1 mL of PVA aqueous solution to the viscous solution of the above-p...

Embodiment 3

[0073] The first step is to prepare graphene-based tin dioxide nanosheets:

[0074] (1) Ultrasonic 1 mg / mL graphene oxide in dimethylformamide solution (100 mL) to form a well-mixed dispersion;

[0075] (2) Add 25 mL of water and hydrochloric acid to the above dispersion to adjust the pH of the solution to 3; add tin tetrachloride (SnCl) under vigorous stirring. 4 ·5H 2 O), after adding, keep at 80℃ for 12h, and cool;

[0076] Among them, the added SnCl 4 ·5H 2 The mass dosage ratio of O to graphene oxide is 2.26:1.

[0077] (3) Centrifuge the above-reacted solution, wash with deionized water, repeat the centrifugation and washing operations three times, and concentrate into a viscous liquid of 5 mg / mL, which is graphene-based tin dioxide nanosheets.

[0078] The second step is to prepare the graphene-based tin dioxide aerogel with three-dimensional structure:

[0079] (1) Add 1 mL of F127 aqueous solution to the viscous solution of the above-prepared graphene-based tin ...

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Abstract

The invention discloses a preparation method and application of a three-dimensional-structure graphene-base metal oxide composite material. According to the preparation method disclosed by the invention, the three-dimensional-structure graphene-base metal oxide composite material is prepared by a hydrothermal freeze-drying method by using single-layer carbon-atom-structure graphene as a carrier and some high molecular polymers as an auxiliary crosslinking agent. The three-dimensional aerogel obtained by the method has high metal oxide carrying capacity. The electrochemical test proves that the three-dimensional aerogel graphene-base metal oxide composite material obtained by the preparation method has excellent loop stability and rate capability. The experiment proves that the discharge capacity of the tin dioxide material can reach 1050 mAhg<-1> under the charging / discharging current of 100 mAg<-1>, and the discharge capacity of the titanium oxide material can reach 150 mAhg<-1> under the charging / discharging current of 50 mAg<-1>.

Description

technical field [0001] The invention relates to a preparation method and application of a graphene-based metal oxide composite material with a three-dimensional structure, and belongs to the fields of material science and electrochemistry. Background technique [0002] With the increasingly prominent energy and environmental issues, the new energy industry has received more and more attention. The hybrid electric vehicle and electric vehicle industries are developing rapidly, and lithium-ion batteries are widely used as an important energy storage device. Lithium-ion batteries have some excellent properties such as high energy density and good cycle performance, and are also considered to be one of the most effective energy storage methods at present. Therefore, further improving their energy density and cycle performance is also a current research difficulty and focus. [0003] The negative electrode of a lithium-ion battery is an important part of the battery, and its str...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48B82Y40/00
CPCY02E60/10
Inventor 冯新亮黄燕山吴东清张帆李爽肖丽王金钻
Owner SHANGHAI JIAO TONG UNIV
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