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Titanium dioxide nano-tube-graphene-sulfur composite material, preparation method and applications thereof

A titanium dioxide, composite material technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of loss of active substances, poor conductivity, etc., to achieve strong adsorption, inhibition of dissolution, good circulation Effects of Stability and Rate Capability

Active Publication Date: 2018-11-06
TIANNENG SAFT ENERGY JOINT CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a titanium dioxide nanotube-graphene-sulfur composite material with good cycle stability and rate performance, which overcomes the poor conductivity of elemental sulfur as the positive electrode material of lithium-sulfur batteries and the loss of active substances caused by being easily soluble in electrolyte and other shortcomings

Method used

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  • Titanium dioxide nano-tube-graphene-sulfur composite material, preparation method and applications thereof
  • Titanium dioxide nano-tube-graphene-sulfur composite material, preparation method and applications thereof
  • Titanium dioxide nano-tube-graphene-sulfur composite material, preparation method and applications thereof

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Embodiment 1

[0038] 1. Preparation of titanium dioxide nanotube-graphene composites

[0039] The raw material is graphite flakes, and graphene oxide is prepared by Hummers. Weigh 0.3g of graphene oxide and 0.6g of titanyl sulfate, and mix them evenly in 60ml of water. Then place it in an 80ml hydrothermal kettle and react at 180°C for 12h. The product was suction-filtered and dried, and then carbonized at 550° C. under a nitrogen atmosphere for a holding time of 2 hours. After the carbonization was completed, the titanium dioxide nanotube-graphene composite material was obtained by cooling and grinding.

[0040] figure 1 It is the XRD of this material, and the reference standard card is titanium dioxide. Depend on figure 1 It can be seen that the above method generates anatase phase TiO 2 .

[0041] figure 2 This is the SEM photo of the material. It can be seen from the figure that a large amount of titanium dioxide is distributed on the surface of graphene.

[0042] image 3 It ...

Embodiment 2

[0049] 1. Preparation of titanium dioxide nanotube-graphene composites

[0050] The raw material is graphite flakes, and graphene oxide is prepared by Hummers. Weigh 0.3g of graphene oxide and 0.7g of titanyl sulfate, and mix them evenly in 60ml of water. Then place it in an 80ml hydrothermal kettle and react at 200°C for 12h. The product was suction-filtered and dried, and then carbonized at 600° C. under a nitrogen atmosphere for a holding time of 3 hours. After carbonization, it was cooled and ground to obtain a titanium dioxide nanotube-graphene composite material.

[0051] 2. Preparation of titanium dioxide nanotube-graphene-sulfur composites

[0052] Dissolve the titanium dioxide nanotube-graphene composite material prepared in step 1 and elemental sulfur 1:5 in carbon disulfide, press it into a cake shape under a pressure of 15MPa, wrap it in tin foil, keep it warm at 155°C for 24h, and cool to obtain the product.

[0053] 3. Use the titania nanotube-graphene-sulfur ...

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Abstract

The invention discloses a titanium dioxide nano-tube-graphene-sulfur composite material, a preparation method and applications thereof, and belongs to the field of lithium sulfur battery materials. The preparation method comprises: (1) preparing graphene oxide; (2) dissolving the graphene oxide and titanyl sulfate in water, and carrying out a hydrothermal reaction to obtain a crude product; (3) carbonizing the crude product in a protective gas atmosphere to obtain a titanium dioxide nano-tube-graphene composite material; and (4) dispersing the titanium dioxide nano-tube-graphene composite material and elemental sulfur in a solvent, pressing into a round cake, sealing, and carrying out thermal insulation to obtain thetitanium dioxide nano-tube-graphene-sulfur composite material. According to the present invention, the preparation method is simple, is easy to control, and is suitable for industrialization; and the prepared titanium dioxide has the unique hollow nano-tube structure, and can accommodate a large amount of sulfur, such that the composite material has good cycle stability and good rate performance, and can be used as lithium sulfur battery positive electrode materials.

Description

technical field [0001] The invention relates to the field of lithium-sulfur battery materials, in particular to a titanium dioxide nanotube-graphene-sulfur composite material and its preparation method and application. Background technique [0002] In recent years, lithium-sulfur batteries using metallic lithium as the negative electrode and elemental sulfur or sulfur-based composite materials as the positive electrode have attracted much attention. The theoretical specific capacity of elemental sulfur is 1672mAh / g, and the theoretical specific energy of lithium-sulfur batteries is as high as 2600Wh / kg, much larger than commercial lithium-ion batteries. Moreover, the abundance of sulfur in nature is about 0.048wt.%, which is rich in resources and low in price. Therefore, lithium-sulfur batteries have great commercial development value in the field of energy storage. [0003] However, the wide adaptability of current lithium-sulfur batteries is still limited by various limit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/364H01M4/38H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 孙伟史凌俊李为标何文祥周翠芳刘新暖张宁陈飞
Owner TIANNENG SAFT ENERGY JOINT CO