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Carbon nitride composite material and preparation method and application thereof

A composite material and carbon nitride technology, applied in electrical components, non-aqueous electrolyte batteries, circuits, etc., can solve problems such as low Coulombic efficiency and poor cycle stability

Inactive Publication Date: 2017-11-17
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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

Method used

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  • Carbon nitride composite material and preparation method and application thereof
  • Carbon nitride composite material and preparation method and application thereof
  • Carbon nitride composite material and preparation method and application thereof

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preparation example Construction

[0068] see further figure 1 and figure 2 , the preparation method of the carbon nitride composite material of an embodiment, comprises the following steps:

[0069] S110, preparing carbon nitride.

[0070] In one of the embodiments, the step of preparing carbon nitride specifically includes:

[0071] S111. Dispersing melamine in methanol to obtain a methanol dispersion of melamine.

[0072] In one embodiment, the mass ratio of melamine to methanol is 1:5˜1:20.

[0073] 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.

[0074] S112, adding concentrated hydrochloric acid to the methanol dispersion of melamine to obtain a mixed solution.

[0075] In one embodiment, the mass concentration of the concentrated hydrochloric acid is 20%-37%.

[0076] In one embodiment, the dosage ratio of melamine to concentrated hydrochloric acid is 1g:1mL˜1g:20mL.

[007...

Embodiment 1

[0109] Disperse 5 g of melamine in 75 g of methanol and stir for 1 h to obtain a methanol dispersion of melamine, then add 10 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. Put the mixed solution in a vacuum drying oven, evaporate methanol to dryness to obtain an intermediate product, and then heat treat the intermediate product at 600° C. under a nitrogen atmosphere to obtain a carbon nitride primary product. Add 1g of carbon nitride primary product into 20mL 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 product is washed to neutrality to obtain carbon nitride, and the specific surface area of ​​carbon nitride is 160m 2 / g.

[0110] Grind 0.2g of carbon nitride and 0.2g of conductive agent acetylene black by ...

Embodiment 2

[0112] Disperse 10 g of melamine in 100 g of methanol and stir for 1 hour 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 hours 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.

[0113] Grind 0.2g of carbon nitride and 0.1g of con...

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Abstract

The invention relates to a carbon nitride composite material and a preparation method and an application thereof. The carbon nitride composite material comprises a substrate and a composite coating layer for covering the surface of the substrate; the composite coating layer comprises carbon nitride, a conductive agent and a binder; the conductive agent is selected from at least one kind of active carbon, acetylene black, Ketjen black, graphite, graphene and carbon nanotubes. The carbon nitride composite material can be applied to a diaphragm of a lithium-sulfur battery; when a polysulfide exists, the conductive agent can transfer electrons generated in the charge-discharge process, so that an effect of a second current collector as well as an effect of physical isolation can be played; in addition, carbon nitride has relatively high physical isolation effect and large specific surface area; and due to existence of the nitrogen element, shuttling of the polysulfide can be suppressed by the dual chemical and physical absorption effects effectively, thereby enabling the lithium-sulfur battery to be relatively high in discharge specific capacity and cycling stability.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium secondary batteries, in particular to a carbon nitride composite material and a preparation method and application thereof. 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/052H01M50/431H01M50/449
CPCH01M10/052H01M50/431H01M50/449Y02E60/10
Inventor 吴文剑汪国秀范洪波程发良柳鹏
Owner DONGGUAN UNIV OF TECH
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