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Preparation method for graphene-coated titanium dioxide nanotube

A graphene-coated, titanium dioxide technology, applied in secondary batteries, electrochemical generators, electrical components, etc., can solve the problem of not having the advantages of tube structure, and achieve the advantages of charging and discharging cycle stability, improving rate performance, The effect of high battery capacity

Inactive Publication Date: 2016-04-20
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are a lot of work reports on graphene composite titanium dioxide particles, nanorods or nanospheres, but the shape of particles, rods or spheres does not have the structural advantages of tubes. Tube composite graphene can improve the specific capacity and rate performance of titanium dioxide.

Method used

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  • Preparation method for graphene-coated titanium dioxide nanotube
  • Preparation method for graphene-coated titanium dioxide nanotube
  • Preparation method for graphene-coated titanium dioxide nanotube

Examples

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preparation example Construction

[0027] Referring to accompanying drawing, the present invention is the preparation method of the titanium dioxide nanotube of graphene coating, and its steps are:

[0028] S1. Take 0.1–5.0g of titanium dioxide nanoparticles and 10M sodium hydroxide into a hydrothermal kettle and stir for 2 hours to obtain a uniform dispersion; The product after the hydrothermal reaction is centrifuged, washed to neutrality, and then dried at low temperature to obtain titanium dioxide nanotubes;

[0029] S2. Put 0.1–3.0g of titanium dioxide nanotubes and 1–10ml of APTMS into a 250ml beaker for reflux for 6 hours, filter the product in the beaker, and take the filtered filter residue for low-temperature drying to obtain amino-modified titanium dioxide tubes ;

[0030] S3, take 0.1-3.0g titanium dioxide tube with amino modification and 1ml concentration is 0.5mgml -1 The graphene oxide solution was fully stirred, and the filter residue was taken after filtration, and dried at low temperature to...

Embodiment 1

[0037] Embodiment 1 adopts this method to prepare graphene-coated titanium dioxide tube

[0038] S1. Hydrothermal preparation of titania nanotubes

[0039] 0.1 g of amorphous titanium dioxide nanoparticles and 10 M sodium hydroxide were put into a hydrothermal kettle and stirred for 2 hours to obtain a uniform dispersion. Then, at 130°C, the homogeneous dispersion was subjected to a hydrothermal reaction for 12 hours, and the product after the hydrothermal reaction was centrifuged and washed to neutrality (removing sodium hydroxide), and then dried at a temperature of 50°C for 16 hours. Titanium dioxide nanotubes are obtained.

[0040] S2. Coated amino

[0041] Get the titanium dioxide nanotube of 0.1g and the 3-(trimethoxysilyl)-1-propanamine (APTMS) of 2ml and put into reflux 6h in the 250ml beaker, the product in the beaker is filtered, get the filter residue after filtering at a temperature of Dry at 60°C for 14 hours to obtain an amino-modified titanium dioxide tube. ...

Embodiment 2

[0046] Example 2 Using this method to prepare graphene-coated titanium dioxide tubes

[0047] S1. Hydrothermal preparation of titania nanotubes

[0048] 0.5 g of anatase-phase titanium dioxide nanoparticles and 10 M sodium hydroxide were put into a hydrothermal kettle and stirred for 2 hours to obtain a uniform dispersion. Then, at 130°C, the homogeneous dispersion was subjected to a hydrothermal reaction for 12 hours, and the product after the hydrothermal reaction was centrifuged, washed with water until neutral (sodium hydroxide was removed), and then dried at a temperature of 70°C for 10 hours. Titanium dioxide nanotubes are obtained.

[0049] S2. Coated amino

[0050] Get the titanium dioxide nanotube of 0.3g and the 3-(trimethoxysilyl)-1-propanamine (APTMS) of 5ml and put into reflux 6h in the 250ml beaker, the product in the beaker is filtered, get the filter residue after filtering at a temperature of Dry at 70°C for 6 hours to obtain an amino-modified titanium diox...

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Abstract

A preparation method for a graphene-coated titanium dioxide nanotube comprises the following steps: adding titanium dioxide nano-particles and sodium hydroxide into a hydrothermal reactor for a hydrothermal reaction, and drying at a low temperature to obtain a titanium dioxide nanotube; placing the titanium dioxide nanotube and APTMS into a beaker for reflux, drying at a low temperature to obtain an amino-modified titanium dioxide tube; uniformly mixing the amino-modified titanium dioxide tube with an oxidized graphene solution, filtering, and drying at a low temperature to obtain a titanium dioxide nanotube coated with the oxidized grapheme and provided with an amino; performing calcination processing on the dioxide nanotube coated with the oxidized graphene and provided with the amino at the inert atmosphere to obtain the graphene-coated titanium dioxide nanotube. According to the preparation method, in a functional group grafting process, the surface of the titanium dioxide nanotube is coated with graphene, so that the titanium dioxide nanotube realizes quick charge and discharge with a high rate, improves the specific capacity and the rate capability, and has the characteristics of being simple to operate, high in repeatability and low in cost.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to a preparation method of graphene-coated titanium dioxide nanotubes. Background technique [0002] Due to the advantages of high energy density, high output voltage, and no memory effect, lithium-ion batteries are widely used in the fields of small mobile electronic products such as cameras, mobile phones, and notebook computers. Eye-catching development prospects. At present, the commercial lithium battery anode material is mainly graphite, but the charging and discharging platform of graphite is low, which has potential safety hazards. Therefore, it is necessary to explore other lithium battery anode materials with high capacity, good safety and rate performance. [0003] The titanium dioxide negative electrode has a charge-discharge platform, and the charge-discharge voltage range is high (1.0-3.0V), and does not form a solid ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/48H01M4/139H01M10/0525
CPCH01M4/139H01M4/366H01M4/483H01M4/583H01M10/0525Y02E60/10
Inventor 郑鹏刘婷郭守武
Owner SHAANXI UNIV OF SCI & TECH
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