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Graphene/boron nitride aerogel and preparation method thereof

An aerogel, boron nitride technology, applied in aerogel preparation, chemical instruments and methods, colloid chemistry, etc., can solve the problem of no aerogel patent, improve the explosion problem and achieve excellent thermal insulation performance , Improve the effect of thermal insulation

Pending Publication Date: 2022-06-07
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, no relevant aerogels have been reported and patented

Method used

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  • Graphene/boron nitride aerogel and preparation method thereof
  • Graphene/boron nitride aerogel and preparation method thereof
  • Graphene/boron nitride aerogel and preparation method thereof

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preparation example Construction

[0050] Specifically, the preparation method of a graphene / boron nitride aerogel provided by the present invention comprises the following steps:

[0051] Step 1) Preparation of melamine diborate solution:

[0052] Melamine and boric acid are dissolved in a co-solvent to obtain a melamine diborate solution.

[0053] Step 2) freeze-drying the melamine diborate solution to obtain a melamine diborate aerogel.

[0054] Step 3) The melamine diborate aerogel is pyrolyzed in a high temperature atmosphere to obtain boron nitride aerogel.

[0055] Step 4) adopting a chemical vapor deposition process in the boron nitride aerogel to achieve uniform grafting of graphene on the boron nitride substrate from the inside to the outside to obtain the graphene / boron nitride aerogel.

[0056] specifically:

[0057] In step 1), the molar ratio of melamine and boric acid is 1:5 to 5:1.

[0058] The mixed volume ratio of water to methanol, ethanol, isopropanol, n-butanol or tert-butanol in the co-s...

Embodiment 1

[0067] Weigh 0.4838g of melamine and 0.4762g of boric acid, and sequentially add them into 48mL of tert-butanol / distilled water co-solvent, wherein the ratio of tert-butanol to distilled water is 7:5, and the concentration of the mixed solution is 20mg / mL. The melamine diboric acid solution is obtained, which is transferred to a vacuum freeze dryer for processing for 24 hours, and the melamine diboric acid aerogel can be obtained.

[0068] The melamine diboric acid aerogel is transferred to a tube furnace, and the temperature is raised to 1100 °C in an ammonia / nitrogen environment for high temperature heat treatment for 3 hours to obtain boron nitride aerogel.

[0069] The obtained boron nitride aerogel is placed in a chemical vapor deposition furnace, and a chemical vapor deposition pump with an adjustable rate is used to control the residence time of the carbon source gas inside the boron nitride aerogel, and the sample is placed in the furnace cavity. Immediately after the ...

Embodiment 2

[0072] 0.2419g of melamine and 0.2381g of boric acid were weighed and added to 48mL of tert-butanol / distilled water co-solvent in turn, wherein the ratio of tert-butanol to distilled water was 7:5, and the concentration of the mixed solution was 10mg / mL. The melamine diboric acid solution is obtained, which is transferred to a vacuum freeze dryer for processing for 24 hours, and the melamine diboric acid aerogel can be obtained.

[0073] The melamine diboric acid aerogel is transferred to a tube furnace, and the temperature is raised to 1100 °C in an ammonia / nitrogen environment for high temperature heat treatment for 3 hours to obtain boron nitride aerogel.

[0074] The obtained boron nitride aerogel is placed in a chemical vapor deposition furnace, and a chemical vapor deposition pump with an adjustable rate is used to control the residence time of the carbon source gas inside the boron nitride aerogel, and the sample is placed in the furnace cavity. Immediately after the bo...

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Abstract

The invention provides graphene / boron nitride aerogel and a preparation method thereof.The preparation method comprises the following steps that melamine diborate aerogel is subjected to pyrolysis treatment, and boron nitride aerogel is obtained; the preparation method comprises the following steps: by taking boron nitride aerogel as a substrate, depositing graphene on the substrate by utilizing a chemical vapor deposition method to obtain graphene / boron nitride aerogel; the aerogel material has the characteristics of heat insulation, Joule heating, elasticity and the like when being used as a battery module material, and compared with a traditional battery module aerogel material, the aerogel material has the advantages that the safety and the stability of a battery are improved, and the production cost of the battery can be greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of batteries, and particularly relates to a graphene / boron nitride aerogel and a preparation method thereof. Background technique [0002] With the rapid development of new energy vehicles, the safety and stability of their internal power batteries are closely watched. Thermal runaway and low temperature battery capacity fading are the main factors affecting battery safety and stability. At this stage, the main measure to solve the problem of battery explosion caused by battery thermal runaway is to use some battery module materials with good heat insulation effect, such as heat insulation board fireproof felt (such as glass fiber, ceramic fiber cotton, etc.) as the material for battery module , Using its good heat insulation effect to suppress the thermal runaway of the battery, but it has the problem that the surface fibers are easily broken and pulverized, resulting in floating fibers or powder pollution...

Claims

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Application Information

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IPC IPC(8): H01M50/242H01M50/249H01M10/615H01M10/625H01M10/658H01M10/6571B01J13/00
CPCH01M50/242H01M50/249H01M10/615H01M10/625H01M10/658H01M10/6571B01J13/0091Y02E60/10
Inventor 冯雷魏鹏宋浩杰贾晓华杨进邵丹王思哲李永何鑫张佳旭王晨欢
Owner SHAANXI UNIV OF SCI & TECH
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