A kind of molten salt chemically synthesized carbon powder and its preparation method and application

A technology for molten salt chemistry and carbon synthesis, which is used in carbon preparation/purification, electrochemical generators, structural parts, etc., can solve problems such as complex synthesis processes, and achieve the effects of simple equipment operation, high-quality preparation, and beneficial recycling.

Active Publication Date: 2020-11-24
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation of these carbon materials generally requires complex synthesis processes and harsh conditions such as high temperature and high vacuum.

Method used

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  • A kind of molten salt chemically synthesized carbon powder and its preparation method and application
  • A kind of molten salt chemically synthesized carbon powder and its preparation method and application
  • A kind of molten salt chemically synthesized carbon powder and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] A preparation method of molten salt chemically synthesized carbon powder, comprising the following steps:

[0083] Step 1, molten salt dehydration treatment

[0084] Weigh 50gCaCl 2 The molten salt was dried in a crucible furnace at 300°C for 24 hours to obtain a dried and dehydrated molten salt;

[0085] Step 2, the preparation of calcium carbide, calcium carbonate raw material and the assembly of reaction device

[0086] Weigh 10gCaCO 3 , and dried at 300°C for 24 hours to obtain dry molten salt. Weigh 13gCaC 2 , crushed in an inert atmosphere, and dried at 80°C.

[0087] Step 3, carbon powder synthesis reaction

[0088] (1) Follow CaC from the bottom of the crucible 2 , CaCl 2 and CaCO 3 The sequence is laid layer by layer into a crucible with a diameter of 50 mm, the reactor is closed, high-purity argon gas is introduced, and circulating cooling water is introduced into the sealing flange of the closed reactor at the same time.

[0089] (2) The temperature...

Embodiment 2

[0093] A kind of preparation method of molten salt chemically synthesized carbon powder body, with embodiment 1, difference is:

[0094] (1) The temperature used in step 2 is 900°C.

[0095] The obtained product structure is a composite structure comprising amorphous carbon and graphite phase, its XRD sees image 3 , whose SEM is Figure 4 ,from Figure 4 It can be seen that the morphology is uniform spherical particles.

Embodiment 3

[0097]A kind of preparation method of molten salt chemically synthesized carbon powder body, with embodiment 1, difference is:

[0098] (1) The molten salt used in step 1 is CaCl 2 -NaCl eutectic mixed molten salt, the mass is 500g, and the two molten salts are evenly mixed before drying;

[0099] (2) CaCO in step 2 3 Mass is 70g, CaC 2 The mass is 91g;

[0100] (3) In step 3 (1), the diameter of the corundum crucible is 100mm;

[0101] (4) CaC in step 3(1) 2 , CaCl 2 -NaCl and CaCO 3 The mixing method is uniform mixing;

[0102] (4) The reaction temperature in step 3(2) is 650° C., and the reaction time is 6 hours.

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Abstract

The invention discloses molten salt chemical synthesis carbon powder, a preparation method and applications thereof, and belongs to the field of chemical synthesis of carbon materials. The preparationmethod comprises: weighing dry CaC2 powder, dry CaCO3 powder and a dehydrated molten salt raw material according to a certain ratio, placing into a crucible, placing the crucible into a closed reactor, and introducing inert gas for protection; heating the closed reactor to a reaction temperature, carrying out thermal insulation for 5 min to 10 h, and carrying out a carbonization reaction to obtain a carbon product; and carrying out ultrasonic cleaning on the carbon product, carrying out solid-liquid separation, removing the molten salt, and drying to obtain carbon powder. According to the present invention, with the application of the carbon powder material as a lithium ion electrode negative electrode carbon material, the capacity and the cycle performance of a battery can be improved; and the method only produces carbon and calcium oxide, and does not generate other toxic and harmful substances, such that the process is environmentally-friendly, simple and feasible.

Description

technical field [0001] The invention belongs to the field of chemical synthesis of carbon materials, in particular to a molten salt chemically synthesized carbon powder and its preparation method and application. Background technique [0002] Carbon materials have various forms such as graphite, amorphous carbon, diamond, carbon nanotubes, graphene, etc. The preparation of corresponding carbon materials also requires different synthetic methods, such as high-temperature sintering of natural graphite, high-temperature pyrolysis of organic carbon, vapor deposition, and epitaxy. Growth, electrolysis, etc. The above methods all have certain advantages, but there are also some technical problems to be overcome. For example, high-temperature sintering of natural graphite and high-temperature pyrolysis of organic carbon generally require high temperatures above 1800°C, which require high heating equipment and high energy consumption; vapor deposition and epitaxial growth require s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05H01M4/62H01M10/0525
CPCC01B32/05H01M4/625H01M10/0525Y02E60/10
Inventor 宋秋实谢志刚谢宏伟宁志强尹华意
Owner NORTHEASTERN UNIV LIAONING
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