CN111204735B - Preparation method and application of carbon fluoride material - Google Patents
Preparation method and application of carbon fluoride material Download PDFInfo
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- CN111204735B CN111204735B CN202010047718.1A CN202010047718A CN111204735B CN 111204735 B CN111204735 B CN 111204735B CN 202010047718 A CN202010047718 A CN 202010047718A CN 111204735 B CN111204735 B CN 111204735B
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- C01B32/00—Carbon; Compounds thereof
- C01B32/10—Carbon fluorides, e.g. [CF]nor [C2F]n
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- H01M4/5835—Comprising fluorine or fluoride salts
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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Abstract
The invention discloses a preparation method of a carbon fluoride material, which comprises the following steps: s1, weighing 70-98% of hard carbon raw material and 2-30% of graphite carbon material by mass, mixing in a solvent, uniformly stirring, and sintering at 300-2800 ℃ in a protective atmosphere for 1-24 hours to obtain a pretreatment material; s2, grinding the pretreatment material obtained in the step S1 and preparing a powdery product; s3, putting the powdery product obtained in the step S2 into fluorination equipment, introducing fluorination gas, keeping the pressure at 90-120 kPa, and reacting at 350-450 ℃ for 8-16 h to obtain the carbon fluoride material. The carbon fluoride material prepared by the invention has high specific power and high specific energy, can realize discharge under the current of 30A/g, has the specific energy of more than 500 Wh/kg and the specific power of more than 41000W/kg, and can be applied to the anode material of the lithium carbon fluoride battery.
Description
Technical Field
The invention belongs to the field of electrochemical energy storage of power supply technology, and particularly relates to a preparation method and application of a carbon fluoride material.
Background
When the carbon fluoride is used as the positive electrode material of the lithium primary battery, the theoretical specific energy of mass is as high as 2180 Wh kg-1, and the carbon fluoride is the commercial lithium primary battery material with the highest theoretical specific energy at present. The lithium fluorocarbon battery is widely applied to various civil and military fields such as electronic radio frequency identification systems, cardiac pacemakers, missile ignition systems, small satellites or space weapons and the like for maneuvering orbital transfer launching, kinetic energy interception missiles, space stations and the like. The specific energy of the carbon fluoride material is determined by the fluorination degree of the material, the higher the fluorination degree is, the higher the theoretical specific energy is, but the higher the fluorination degree is, the poorer the electronic conductance of the material is, when the fluorine-carbon ratio is close to 1, the carbon fluoride is equivalent to an electronic insulator, the large-rate discharge performance of the material is limited, the specific capacity and the rate performance are mutually restricted, and the two are difficult to simultaneously achieve the optimization.
In order to improve the rate capability of carbon fluoride materials, researchers have developed various material modification approaches. For example, the measure of coating the surface with the high-conductivity material plays a certain role in improving the rate capability of the material. The direct addition of highly conductive carbon nanotubes, graphene, and the like in the positive electrode formulation is also a traditional modification measure. In addition, it is also a way to improve the discharge performance of the material by compounding a second phase positive electrode active material having a good rate capability or a higher discharge voltage with carbon fluoride. However, the methods are difficult to achieve the optimization of the specific capacity and the rate capability of the carbon fluoride material at the same time, and how to achieve the property of high specific energy while obtaining the performance of high specific power puts requirements on the structural design of the carbon fluoride material.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method for producing a carbon fluoride material having both high specific power and high specific energy, and use thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for preparing a carbon fluoride material, comprising the steps of:
s1, weighing 70-98% of hard carbon raw material and 2-30% of graphite carbon material by mass, mixing in a solvent, uniformly stirring, and sintering at 300-2800 ℃ in a protective atmosphere for 1-24 hours to obtain the pretreatment material.
S2, grinding the pretreatment material obtained in the step S1 and preparing a powdery product.
S3, putting the powdery product obtained in the step S2 into fluorination equipment, introducing fluorination gas, keeping the pressure at 90-120 kPa, and reacting at 350-450 ℃ for 8-16 h to obtain the carbon fluoride material.
Further, in the step S2, the pretreatment material is ground until the particle size reaches below 60 um, and then the powder is sequentially sieved through a 200-mesh sieve, a 400-mesh sieve and a 800-mesh sieve to obtain a powdery product.
Further, the fluorocarbon material prepared in step S3 has a fluorocarbon ratio of 0.7 to 1.0.
Further, the hard carbon raw material is one or a combination of acetylene black, Super P, glucose, sucrose, cellulose, a metal organic framework material, ionic liquid, starch, a high molecular polymer and resin.
Wherein the starch is one or more of potato starch, corn starch, wheat starch, sweet potato starch and arrowroot starch. The high molecular polymer is one or a combination of polyacrylonitrile, polyaniline, polyvinylpyrrolidone, polypyrrole and polyvinyl chloride. The resin is one or the combination of more of phenolic resin, epoxy resin, polyfurfuryl alcohol resin and polyvinyl alcohol resin.
Further, the graphite-like carbon material is one or a combination of natural graphite, artificial graphite, graphene and carbon nanotubes.
Further, the solvent is one or more of water, ethanol, acetone, methyl methacrylate, butyl acrylate, acrylic acid, isopropanol, butyl glycol ether, tetrahydrofuran, benzene, toluene, xylene and dimethylformamide.
Further, the protective atmosphere is one or a combination of nitrogen, argon, neon and helium.
Further, the fluoridizing gas is one or a combination of more of xenon difluoride, nitrogen trifluoride, fluorine gas, boron trifluoride and mixed gas of fluorine gas and argon gas.
The invention also discloses an application of the carbon fluoride material prepared by the preparation method in preparation of a lithium carbon fluoride battery.
The invention has the following beneficial effects: the carbon fluoride material prepared by the preparation method has high specific power and high specific energy, can realize discharge under the current of 30A/g, has the specific energy of more than 500 Wh/kg and the specific power of more than 41000W/kg, and can be applied to the anode material of the lithium carbon fluoride battery.
Drawings
FIG. 1 is a diagram illustrating the electrochemical performance test results of the carbon fluoride material prepared in the first embodiment.
Detailed Description
The invention is further described with reference to the following drawings and detailed description.
Example one
A method for preparing a carbon fluoride material, comprising the steps of:
the method comprises the following steps: according to the mass ratio of the hard carbon raw material sucrose to the graphene material of 98%: 2 percent, mixing the sucrose material and the graphene material in a deionized water solvent, adding a little ethanol solvent, uniformly stirring, and sintering for 8 hours at 800 ℃ in a protective atmosphere to obtain the pretreatment material.
And step two, grinding the pretreated product obtained in the step one until the particle size reaches below 60 microns, and sequentially sieving the ground product with 200-mesh, 400-mesh and 800-mesh sieves to obtain a powdery product.
Step three: and (3) putting the powder material obtained in the step two into fluorination equipment, introducing a fluorination gas NF3, keeping the pressure at 100 kPa, and reacting for 12 h at 430 ℃ to obtain the carbon fluoride material with the bulk phase containing grapheme carbon and the fluorine-carbon ratio of 0.85.
The carbon fluoride material prepared by the method is used as a lithium battery anode material to be assembled into a button cell to be tested for electrochemical performance: (1) the working electrode is a bulk phase containing graphene carbon, the mass ratio of the carbon fluoride to the acetylene black to the polyvinylidene fluoride is 0.85, and the mass ratio of the carbon fluoride to the acetylene black to the polyvinylidene fluoride is 8: 1: 1, mixing materials; (2) the counter electrode is a lithium metal sheet; (3) the electrolyte is 1M lithium tetrafluoroborate solution dissolved in ethylene carbonate and dimethyl carbonate (volume ratio is 1: 1); (4) the discharge cut-off voltage is 1.5V; 5) the discharge current was 30A/g.
The performance results obtained from the above tests are shown in FIG. 1, and the material shows excellent rate performance, discharge to 1.5V at 30A/g, discharge time of 48 s, specific energy of 709 Wh/kg, and specific power of 53175W/kg.
Example two
A method for preparing a carbon fluoride material, comprising the steps of:
the method comprises the following steps: according to the mass ratio of the hard carbon raw material sucrose to the graphene material of 70%: 30 percent, mixing the sucrose material and the graphene material in a deionized water solvent, adding a little ethanol solvent, uniformly stirring, and sintering for 24 hours at the temperature of 300 ℃ in a protective atmosphere to obtain the pretreatment material.
And step two, grinding the pretreated product obtained in the step one until the particle size reaches below 60 microns, and sequentially sieving the ground product with 200-mesh, 400-mesh and 800-mesh sieves to obtain a powdery product.
Step three: and (3) putting the powder material obtained in the step two into fluorination equipment, introducing a fluorination gas NF3, keeping the pressure at 90 KPa, and reacting for 8 hours at 350 ℃ to obtain the carbon fluoride material with the bulk phase containing grapheme carbon and the fluorine-carbon ratio of 0.75.
The carbon fluoride material prepared in the embodiment is tested, and the material shows excellent rate performance, and is discharged to 1.5V at 30A/g, the discharge time is 45 s, the specific energy is 520 Wh/kg, and the specific power is 41600W/kg.
EXAMPLE III
A method for preparing a carbon fluoride material, comprising the steps of:
the method comprises the following steps: according to the mass ratio of the hard carbon raw material sucrose to the graphene material of 85%: 15 percent, mixing the sucrose material and the graphene material in a deionized water solvent, adding a little ethanol solvent, uniformly stirring, and sintering for 1 hour at 2800 ℃ in a protective atmosphere to obtain the pretreatment material.
And step two, grinding the pretreated product obtained in the step one until the particle size reaches below 60 microns, and sequentially sieving the ground product with 200-mesh, 400-mesh and 800-mesh sieves to obtain a powdery product.
Step three: and (3) putting the powder material obtained in the step two into fluorination equipment, introducing a fluorination gas NF3, keeping the pressure at 120kPa, and reacting for 10 hours at 450 ℃ to obtain the carbon fluoride material with the bulk phase containing grapheme carbon and the fluorine-carbon ratio of 0.8.
The carbon fluoride material prepared in the embodiment is tested, and the material shows excellent rate performance, and is discharged to 1.5V at 30A/g, the discharge time is 47 s, the specific energy is 601 Wh/kg, and the specific power is 46034W/kg.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A method for producing a carbon fluoride material, characterized by comprising the steps of:
s1, weighing 70-98% of hard carbon raw material and 2-30% of graphite carbon material by mass, mixing in a solvent, uniformly stirring, and sintering at 300-2800 ℃ in a protective atmosphere for 1-24 hours to obtain a pretreatment material; the hard carbon raw material is one or a combination of acetylene black, Super P, glucose, sucrose, cellulose, starch and resin; the starch is one or a combination of more of potato starch, corn starch, wheat starch, sweet potato starch and arrowroot, and the resin is one or a combination of more of phenolic resin, epoxy resin, polyfurfuryl alcohol resin and polyvinyl alcohol resin; the graphite carbon material is one or a combination of more of natural graphite, artificial graphite, graphene and carbon nano tubes; the solvent is one or the combination of water, ethanol and acetone;
s2, grinding the pretreatment material obtained in the step S1 and preparing a powdery product;
s3, putting the powdery product obtained in the step S2 into fluorination equipment, introducing fluorination gas, keeping the pressure at 90-120 kPa, and reacting at 350-450 ℃ for 8-16 h to obtain the carbon fluoride material with the fluorine-carbon ratio of 0.7-1.0.
2. The method for producing a carbon fluoride material according to claim 1, wherein: in the step S2, the pretreatment material is ground until the particle size reaches below 60 mu m, and then the powder is sequentially sieved by a 200-mesh sieve, a 400-mesh sieve and a 800-mesh sieve to obtain a powdery product.
3. The method for producing a carbon fluoride material according to claim 1, wherein: the protective atmosphere is one or a combination of more of nitrogen, argon, neon and helium.
4. The method for producing a carbon fluoride material according to claim 1, wherein: the fluoridizing gas is one or a combination of more of xenon difluoride, nitrogen trifluoride, fluorine gas, boron trifluoride and fluorine gas and argon gas mixed gas.
5. Use of the carbon fluoride material produced by the production method according to any one of claims 1 to 4 for producing a lithium carbon fluoride cell.
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| CN111969201A (en) * | 2020-08-21 | 2020-11-20 | 天津大学 | Preparation method of fluorine-doped phenolic resin-based hard carbon negative electrode material |
| CN113422059B (en) * | 2021-06-17 | 2022-06-28 | 贵州梅岭电源有限公司 | High-voltage carbon fluoride composite cathode material and preparation method thereof |
| CN113912042B (en) * | 2021-11-22 | 2023-04-25 | 郑州大学 | Method for preparing carbon nano tube by perfluorocarbon generated by aluminum electrolysis |
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Effective date of registration: 20230904 Address after: 361000 Room 301, No. 178-2, Zhennan Second Road, Xinmin Town, Tong'an District, Xiamen City, Fujian Province Patentee after: XIAMEN ZHONGKE XIFU TECHNOLOGY Co.,Ltd. Address before: No. 258, Shanxi Heng Road, Jimei District, Xiamen City, Fujian Province, 361000 Patentee before: XIAMEN INSTITUTE OF RARE EARTH MATERIALS |