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A kind of preparation method of carbon fluoride cathode material based on hydrogen bond organic framework material

An organic framework and cathode material technology, applied in the field of preparation of fluorinated carbon cathode materials, can solve the problems of high production cost and post-processing cost, affecting the specific energy of fluorinated carbon batteries, unfavorable industrial production, etc., and reduce the fluorination reaction. Temperature, abundant inner pores, and the effect of improving fluorination efficiency

Active Publication Date: 2022-07-01
CIVIL AVIATION UNIV OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the reported fluorinated carbon materials mainly include: fluorinated graphene, fluorinated carbon nanotubes, fluorinated fullerenes, fluorinated graphite, fluorinated activated carbon, etc., among which fluorinated graphene and fluorinated carbon nanotubes There are many studies on batteries as positive electrode materials. This type of material has a large specific capacity, but the disadvantage is that the discharge voltage platform is low, which affects the specific energy of the entire carbon fluoride battery.
At the same time, the carbon source of this type of fluorinated carbon material is graphene and carbon nanotubes, and the cost of raw materials is high; and its fluorination conditions are harsh (fluorination at a temperature greater than 500°C in a fluorine gas atmosphere), so it is not conducive to industrial production
[0003] Metal-organic framework materials (MOFs) have been used in the preparation of carbon fluoride cathode materials (such as invention patents: CN201910398470.0, CN201910415544.7, CN201910398454.1, CN201910415216.7), although such materials can be improved to a certain extent Fluorinated carbon battery performance, but this type of material contains a large amount of metal elements, resulting in high production costs and post-processing costs, and it is difficult to prepare carbon containing non-metallic heteroatoms (such as boron, nitrogen, etc.) in situ materials, and carbon materials containing non-metallic heteroatoms have been proven to have the advantages of low fluorination temperature and good performance of carbon fluoride batteries

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  • A kind of preparation method of carbon fluoride cathode material based on hydrogen bond organic framework material

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Embodiment 1

[0017] The preparation method of the fluorinated carbon positive electrode material based on the hydrogen bond organic framework material provided by this embodiment includes the following steps in order:

[0018] (1) 1.0g of 2,4-diamino-1,3,5-triazine-based hydrogen-bonded organic framework material HOF-1 was carbonized at high temperature in a nitrogen atmosphere, the heating rate was 5°C / min, and the carbonization temperature was 900 ℃, the carbonization time is 4 hours, and then cooled to room temperature to obtain the carbon source of the carbon fluoride precursor;

[0019] (2) The carbon source of the above-mentioned carbon fluoride precursor is placed in a reactor and dried at a temperature of 150 ° C, and then a volume fraction of 30% of fluorine gas, 15% of hydrogen fluoride and 55% of argon gas is introduced. The mixed gas was used as a fluorinated gas, and the temperature was raised to 220 ° C, and the fluorination reaction was carried out for 4 hours. After the flu...

Embodiment 2

[0022] The preparation method of the fluorinated carbon positive electrode material based on the hydrogen bond organic framework material provided by this embodiment includes the following steps in order:

[0023] (1) 1.0 g of carboxylic acid hydrogen-bonded organic framework material HOF-TCPB was carbonized at high temperature in a nitrogen atmosphere, the heating rate was 5°C / min, the carbonization temperature was 900°C, and the carbonization time was 4 hours, and then cooled to room temperature, Obtain the carbon source of fluorocarbon precursor;

[0024] (2) The carbon source of the above-mentioned carbon fluoride precursor is placed in a reaction kettle and dried at a temperature of 150 ° C, and then a volume fraction of 40% of fluorine gas, 15% of hydrogen fluoride and 45% of argon gas is introduced. The mixed gas was used as a fluorinated gas, and the temperature was raised to 210 ° C, and the fluorination reaction was carried out for 4 hours. After the fluorination rea...

Embodiment 3

[0027] The preparation method of the fluorinated carbon positive electrode material based on the hydrogen bond organic framework material provided by this embodiment includes the following steps in order:

[0028] (1) 1.0 g of amide-based hydrogen-bonded organic framework material HOF-8 is carbonized at high temperature in a nitrogen atmosphere, the heating rate is 5°C / min, the carbonization temperature is 900°C, and the carbonization time is 4 hours, and then cooled to room temperature to obtain Fluorocarbon precursor carbon source;

[0029] (2) The carbon source of the above-mentioned carbon fluoride precursor is placed in a reactor and dried at a temperature of 150 ° C, and then a volume fraction of 55% of fluorine gas, 15% of hydrogen fluoride and 30% of argon gas is introduced. The mixed gas was used as a fluorinated gas, and the temperature was raised to 200 ° C, and the fluorination reaction was carried out for 4 hours. After the fluorination reaction was completed, arg...

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Abstract

The invention discloses a preparation method of a carbon fluoride positive electrode material based on a hydrogen bond organic framework material. It uses a porous material, a hydrogen-bonded organic framework material, as a raw material, and can obtain a porous carbon material containing heteroatoms through high-temperature carbonization. A mixed gas composed of fluorine gas, hydrogen fluoride and argon gas is used as the fluorinated gas. Porous carbon materials can be fluorinated to obtain fluorinated carbon cathode materials containing heteroatoms; since the porous carbon materials contain a large number of heteroatoms, and the heteroatoms can make the formation of C-F bonds easier through electron induction, which can reduce the The fluorination reaction temperature, and the generated C-F bonds are mostly semi-ionic bonds, which can improve the discharge voltage platform of the carbon fluoride positive electrode material; Fluorination gas, due to the strong polarization of hydrogen fluoride, can also reduce the fluorination reaction temperature to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of carbon material synthesis, and in particular relates to a preparation method of a fluorinated carbon positive electrode material based on a hydrogen bond organic framework material. Background technique [0002] Lithium / carbon fluoride batteries have the highest theoretical energy density among existing primary batteries, so they have been widely used in aerospace, military, medical and other fields. At present, the reported fluorinated carbon materials mainly include: fluorinated graphene, fluorinated carbon nanotubes, fluorinated fullerenes, fluorinated graphite, fluorinated activated carbon, etc. Among them, fluorinated graphene and fluorinated carbon nanotubes There are many studies on batteries used as cathode materials. Such materials have large specific capacity, but the disadvantage is that the discharge voltage platform is low, which affects the specific energy of the entire fluorocarbon battery....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M6/14H01M10/0525C01B32/10
CPCH01M4/5835H01M6/14H01M10/0525C01B32/10Y02E60/10
Inventor 候小鹏李秀涛曾浩杜邵文李娜朱怡雯傅小珂
Owner CIVIL AVIATION UNIV OF CHINA