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Graphite phase carbon nitride/polymer composite material and preparation method, energy storage material

A technology of graphite phase carbon nitride and composite materials, applied in the field of composite materials, can solve problems such as the drop of breakdown field strength, and achieve the effects of improving dielectric constant, large output and simple preparation method

Active Publication Date: 2020-11-10
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, people increase the dielectric constant of composite materials by adding high dielectric constant barium titanate, but the breakdown field strength often decreases significantly.

Method used

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  • Graphite phase carbon nitride/polymer composite material and preparation method, energy storage material
  • Graphite phase carbon nitride/polymer composite material and preparation method, energy storage material
  • Graphite phase carbon nitride/polymer composite material and preparation method, energy storage material

Examples

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preparation example Construction

[0039] like figure 1 As shown, the preparation method of the graphite phase carbon nitride / polymer composite material according to the embodiment of the present invention comprises the following steps:

[0040] Step S1, providing graphitic carbon nitride, the graphitic carbon nitride has a flake structure.

[0041] Wherein, the planar size of the graphitic carbon nitride having a flake structure may be 50-1500 nm, and the thickness may be 5-50 nm. When the graphite phase carbon nitride is in the shape of a disc, the average diameter of the plane is 80-400nm, and the thickness is about 20-30nm, the composite material has more excellent comprehensive properties.

[0042] The graphite phase carbon nitride can use commercially available graphite phase carbon nitride of flake structure, preferably, prepare by the following method:

[0043] Using at least one of urea, melamine, dicyandiamide, and thiourea as raw materials, after calcination, the resulting product is ultrasonically...

Embodiment 1

[0054] 1) Preparation of graphite phase carbon nitride

[0055] Take 10g of urea and place it in a ceramic crucible with a cover, heat it up to 550°C in a muffle furnace, keep it warm for 4 hours, then cool it down naturally, wash it with a small amount of water and ethanol three times, and vacuum filter the filter cake at 80°C Dry for 8 hours at lower temperature to obtain dry graphitic carbon nitride (g-C 3 N 4 ).

[0056] figure 2 Its SEM photograph is shown. Depend on figure 2 It can be seen that the prepared graphitic carbon nitride has a flake structure. Measure at least 100 g-C on SEM 3 N 4 According to the size of the particles, the average size of the plane is about 1000-1500nm in length, 500-900nm in width, and the thickness of the particles is about 50nm.

[0057] 2) Preparation of composite materials

[0058] Take 0.02g of graphite phase carbon nitride prepared in step 1) and add it to 30mL of N,N-dimethylformamide, then continue to add 1.98g of polyviny...

Embodiment 2

[0064] Except that the product after natural cooling in the preparation of 1) graphite phase carbon nitride in the above-mentioned embodiment 1 was subjected to ultrasonic treatment in a mixed solution of ethanol and water for 10 hours and then centrifugally filtered and dried, the same as in Example 1 method to prepare graphitic carbon nitride and measure its particle size. SEM photo shows the obtained graphitic carbon nitride g-C 3 N 4 It is a disc-like structure. The plane average size diameter of the particles is about 290-340nm, and the thickness is about 30nm.

[0065] According to the same method as in Example 1 above, a composite material was prepared using the graphite phase carbon nitride obtained above, and the properties of the composite material were tested. Wherein, the sample number of the obtained composite material is marked as 2#, and its dielectric constant and breakdown field strength are tested according to the same method as in Example 1, and its energ...

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Abstract

The invention provides a graphite-phase carbon nitride / polymer composite material, a preparation method and an energy storage material, the graphite-phase carbon nitride in the graphite-phase carbon nitride / polymer composite material has a sheet structure, and the mass percentage content of the graphite-phase carbon nitride in the composite material is 1-30%. According to the graphite-phase carbonnitride / polymer composite material disclosed by the embodiment of the invention, the dielectric constant, the breakdown field strength and the energy storage density of the composite material can beimproved by introducing the graphite-phase carbon nitride with the sheet structure; besides, the preparation method of the graphite-phase carbon nitride is simple and high in yield, so that the preparation method is suitable for expanded production and is used for preparing the graphite-phase carbon nitride / polymer composite material.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a graphite phase carbon nitride / polymer composite material, a preparation method, and an energy storage material. Background technique [0002] Capacitors with high energy storage density play an important role in the electrical and electronic industries, and are widely used in fields such as transportation, medical care, civil products, energy and aerospace. In recent years, with the development of capacitors towards miniaturization, light weight and integration, polymer materials with high energy storage density have received great attention. [0003] The energy storage density of polymer materials can be calculated according to the following formula (1): [0004] [0005] Among them, W b is the energy storage density of the dielectric polymer material (unit: J / m 3 ), ε 0 is the vacuum permittivity (unit: F / m), ε r is the relative permittivity of the polymer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/16C08K7/00C08K3/28C08J5/18C08L27/14C08L27/12C08L27/20C08L79/08
CPCC08J5/18C08J2327/12C08J2327/14C08J2327/16C08J2327/20C08J2379/08C08K3/28C08K7/00C08K2201/003
Inventor 刘晓林刘苏涛叶同
Owner BEIJING UNIV OF CHEM TECH
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