Titanium dioxide doped carbon nitride and its preparation method and application

A technology of titanium dioxide and carbon nitride, applied in structural parts, electrical components, battery pack parts, etc., can solve problems such as poor cycle stability and low coulombic efficiency of lithium-sulfur batteries

Active Publication Date: 2020-08-11
DONGGUAN UNIV OF TECH
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  • Abstract
  • Description
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Problems solved by technology

[0004] Based on this, it is necessary to provide a titanium dioxide-doped carbon nitride and its preparation method and application for the current problems of low coulombic efficiency and poor cycle stability of lithium-sulfur batteries

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  • Titanium dioxide doped carbon nitride and its preparation method and application
  • Titanium dioxide doped carbon nitride and its preparation method and application
  • Titanium dioxide doped carbon nitride and its preparation method and application

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preparation example Construction

[0037] see figure 1 , the preparation method of titanium dioxide doped carbon nitride of an embodiment, comprises the following steps:

[0038] S110, preparing carbon nitride.

[0039] In one of the embodiments, the step of preparing carbon nitride specifically includes the following steps:

[0040] S111. Dispersing melamine in methanol to obtain a methanol dispersion of melamine.

[0041] In one embodiment, the mass ratio of melamine to methanol is 1:5˜1:20.

[0042] In one embodiment, the melamine is added into the methanol and then stirred, the time of the stirring is 1h-4h, and the rotation speed of the stirring is 80r / min-200r / min.

[0043] S112, adding concentrated hydrochloric acid to the methanol dispersion of melamine to obtain a mixed solution.

[0044] In one embodiment, the mass concentration of the concentrated hydrochloric acid is 20%-37%.

[0045] In one embodiment, the dosage ratio of melamine to concentrated hydrochloric acid is 1g:1mL˜1g:20mL.

[0046] ...

Embodiment 1

[0113] Disperse 5 g of melamine in 75 g of methanol and stir for 1 h to obtain a methanol dispersion of melamine, then add 5 mL of concentrated hydrochloric acid with a mass concentration of 37% to the methanol dispersion of melamine, and continue stirring for 1 h to obtain a mixed solution. The mixed solution was placed in a vacuum drying oven, methanol and the like were evaporated to dryness to obtain an intermediate product, and then the intermediate product was heat-treated at 600° C. under a nitrogen atmosphere to obtain carbon nitride. Add 1g of carbon nitride into 50mL of concentrated nitric acid with a mass concentration of 95%, and perform ultrasonic treatment, wherein the power of ultrasonic treatment is 100W, and the time of ultrasonic treatment is 15h; the carbon nitride is washed alternately with water and alcohol until Neutral to get stripped carbon nitride, the specific surface area of ​​stripped carbon nitride is 160m 2 / g.

[0114] Add 0.2 g of stripped carbo...

Embodiment 2

[0117] Disperse 10 g of melamine in 100 g of methanol and stir for 1 h to obtain a methanol dispersion of melamine, then add 200 mL of concentrated hydrochloric acid with a mass concentration of 20% to the methanol dispersion of melamine, and continue stirring for 4 h to obtain a mixed solution. The mixed solution was placed in a vacuum drying oven, methanol, etc. were evaporated to dryness to obtain an intermediate product, and then the intermediate product was heat-treated at 550° C. under a nitrogen atmosphere to obtain a carbon nitride primary product. Add 1g of carbon nitride primary product into 50mL of concentrated nitric acid with a mass concentration of 95%, and perform ultrasonic treatment, wherein the power of ultrasonic treatment is 100W, and the time of ultrasonic treatment is 10h; The product is washed to neutrality to obtain carbon nitride, and the specific surface area of ​​carbon nitride is 180m 2 / g.

[0118] Add 0.2 g of stripped carbon nitride to 120 mL of...

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Abstract

The invention relates to a titanium dioxide doped carbon nitride and its preparation method and application. A preparation method of titanium dioxide-doped carbon nitride, comprising the following steps: adding carbon nitride to an alkali solution and ultrasonically treating the carbon nitride until the carbon nitride is uniformly dispersed to obtain a first dispersion liquid; adding the carbon nitride to the first dispersion liquid adding titanium dioxide and performing ultrasonic treatment until the titanium dioxide is uniformly dispersed to obtain a second dispersion liquid; and performing hydrothermal treatment on the second dispersion liquid to obtain titanium dioxide doped carbon nitride. The titanium dioxide-doped carbon nitride prepared by the above-mentioned preparation method of titanium dioxide-doped carbon nitride is applied to the lithium-sulfur battery separator, and carbon nitride and titanium dioxide can exert a good synergistic effect, and can have a strong adsorption effect on sulfur , inhibit the shuttle effect of polysulfides, and facilitate the redox reaction of sulfur, thereby improving the specific capacity and cycle stability of the battery.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium secondary batteries, in particular to titanium dioxide doped carbon nitride and its preparation method and application. Background technique [0002] With the increasing role of advanced electronic devices such as mobile phones and laptops in our lives, the demand for energy storage systems is increasing. In a lithium-sulfur battery system, the elemental sulfur cathode has a capacity of up to 1675 mAh g -1 The theoretical specific capacity, when combined with metal lithium, the theoretical energy density of the battery pair can reach 2600Wh·kg -1 , In addition, sulfur element has the advantages of abundant resources, environmental friendliness, and low price. Lithium-sulfur batteries have become the most promising next-generation high-energy-density battery systems. However, there are still many problems to be solved in lithium-sulfur batteries, the most prominent of which is the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052H01M50/403H01M50/431
CPCY02E60/10
Inventor 吴文剑杨树颜范洪波程发良柳鹏
Owner DONGGUAN UNIV OF TECH
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