Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of titanium dioxide nanotube-graphene-sulfur composite material and its preparation method and application

A titanium dioxide, composite material technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as poor conductivity and loss of active substances, achieve inhibition of dissolution, strong adsorption, high specificity. energy effect

Active Publication Date: 2021-04-09
TIANNENG SAFT ENERGY JOINT CO
View PDF1 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of titanium dioxide nanotube-graphene-sulfur composite material and its preparation method and application
  • A kind of titanium dioxide nanotube-graphene-sulfur composite material and its preparation method and application
  • A kind of titanium dioxide nanotube-graphene-sulfur composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

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 and elemental sulfur 1:5 prepared in step 1 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 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
lengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a titanium dioxide nanotube-graphene-sulfur composite material and a preparation method and application thereof, belonging to the field of lithium-sulfur battery materials. The preparation method comprises: (1) preparing graphene oxide; (2) dissolving graphene oxide and titanyl sulfate in water, and performing a hydrothermal reaction to obtain a crude product; (3) carrying out the crude product under a protective gas atmosphere Carbonization to obtain titanium dioxide nanotube-graphene composite material; (4) titanium dioxide nanotube-graphene composite material and elemental sulfur are dispersed in a solvent and pressed into a round cake, sealed, and kept warm to obtain the titanium dioxide nanotube-graphene ene-sulfur composites. The preparation method of the invention is simple, easy to control and beneficial to realize industrialization. Since the prepared titanium dioxide has a unique hollow nanotube structure, which can accommodate a large amount of sulfur, the composite material has good cycle stability and rate performance, and can be used as a cathode material for lithium-sulfur batteries.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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