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Preparation method of graphite-TiO2-B composite material

A composite material, -tio2-b technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of application limitation, easy to agglomerate, poor TiO2 conductivity, etc., and achieve low cost, good rate performance and cycle. Stability, the effect of improving chemical properties

Inactive Publication Date: 2015-04-29
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But because TiO 2 The conductivity itself is not good, which greatly limits the application
However, there is a strong van der Waals force between graphene sheets, which has the disadvantage of being prone to agglomeration.

Method used

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  • Preparation method of graphite-TiO2-B composite material
  • Preparation method of graphite-TiO2-B composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A graphene-TiO 2 -The preparation method of composite material, this method comprises the following steps:

[0027] (1) Preparation of graphene

[0028] Using graphite powder as raw material, using the Hummers method, namely NaNO 3 Add it into concentrated sulfuric acid, add graphite powder and potassium permanganate after complete dissolution, further react to obtain a bright yellow system, obtain graphite oxide after filtration and drying, and then pass through a tube furnace to prepare graphene through thermal expansion.

[0029] (2) Bud-shaped TiO 2 - Preparation of B

[0030] 4mlTiCl 3 , 4ml of deionized water and 40ml of ethylene glycol were put into a beaker and stirred for 10min. The mixture was transferred to a 50ml autoclave, reacted at 150°C for 6h, and cooled naturally to room temperature. Centrifuge and wash with ethanol and deionized water several times. Then dry at 60°C for 8h, put the dried powder in a muffle furnace for sintering at 400°C for 2h,...

Embodiment 2

[0034] (1) The preparation method of graphene is the same as step (1) in Example 1.

[0035] (2) Bud-shaped TiO 2 - Preparation of B

[0036] 4mlTiCl 3 , 4ml of deionized water was stirred at room temperature, 120ml of ethylene glycol was added, stirred for 10min, the mixture was transferred to a 150ml autoclave, reacted at 150°C for 4h, and naturally cooled to room temperature. After centrifugation, wash with ethanol and deionized water several times. Dry at 60°C for 8h, place the dried powder in a muffle furnace for sintering at 300°C for 4h, and cool naturally to obtain flower-like TiO 2 -B material.

[0037] (3) Graphene and TiO 2 The preparation of -B composite material is the same as step (3) in Example 1.

Embodiment 3

[0039] (1) The preparation method of graphene is the same as step (1) in Example 1.

[0040] (2) Bud-shaped TiO 2 - Preparation of B

[0041] 1.0mlTiCl 4 Dissolve in 80ml of ethylene glycol, stir at room temperature for 2h, then add 2mL of ammonia water (25wt%), and stir for 10min. The mixture was transferred to a 100ml autoclave, reacted at 150°C for 24h, and cooled naturally to room temperature. After centrifugation, wash with ethanol and deionized water several times. Dry at 100°C for 8h, place the dried powder in a muffle furnace for sintering at 350°C for 2h, and cool naturally to obtain flower-like TiO 2 -B material.

[0042] (3) Graphene and TiO 2 The preparation of -B composite material is the same as step (3) in Example 1.

[0043] Depend on figure 1 As shown, the bud-shaped TiO 2 It can be seen from the XRD spectrum of -B that the products are all TiO 2 -B (Bronzemine) structure; by figure 2 Bud-shaped TiO 2 From the scanning electron microscope image of...

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Abstract

The invention relates to a preparation method of a graphite-TiO2-B composite material. The method comprises the following steps: (1) preparing graphite oxide by utilizing a Hummers method, and then preparing graphene by utilizing a hot swelling method; (2) preparing bud-shaped TiO2-B from titanium source and additives by utilizing a hydrothermal method; and (3) physically stirring the graphene and the TiO2-B at the room temperature, and mixing the graphene and the TiO2-B to obtain a graphene-coating bud-shaped TiO2-B composite material. The composite material is the graphene-coating bud-shaped TiO2-B, and the size of the bud is about 400nm to 500nm. The preparation method of the graphene-coating bud-shaped TiO2-B composite material has advantages of being simple and low in cost, the prepared graphene-coating bud-shaped TiO2-B composite material can be widely applied to a lithium battery negative electrode material and is good in rate capacity and circulating stability, and the chemical performance can be remarkably improved.

Description

Technical field [0001] The invention is the field of composite materials preparation, involving a graphene-TIO 2 -B composite material preparation method. Background technique [0002] After being reported by Geim, a professor at the University of Manchester in 2004 in 2004, it has attracted widespread attention due to its unique physical chemical properties.Graphene is a two -dimensional (2D) cycle cell line structure composed of a carbon six -dollar ring. It is the basic unit to build other dimensions of carbon -based materials.Graphene has many excellent structures and properties, such as high ratio of surface area, large electronic migration rate, good thermal conductivity, etc., which can compound it as a performance enhancement with other compounds to prepare a composite material with excellent performance. [0003] TIO 2 -B phase was discovered in 1980 by Marchand et al. 2 TI 4 O 9 The method of ion exchange, thermal treatment and other methods are successfully prepared fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M4/485H01M4/1393H01M4/1391H01M4/139
CPCH01M4/139H01M4/1391H01M4/1393H01M4/483H01M4/485H01M4/62Y02E60/10
Inventor 周忠福张晶晶王敬峰王清露
Owner SHANGHAI UNIV
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