CN219156517U - Device for preparing artificial graphite negative electrode material for lithium ion battery - Google Patents
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Abstract
The utility model discloses a device for preparing an artificial graphite negative electrode material for a lithium ion battery and a preparation method thereof, and particularly relates to the field of battery materials. The device comprises a material coarse crushing and drying unit, a mechanical grinding and shaping unit, a modification unit, a depolymerization unit, a graphitization unit, a carbonization unit and a post-treatment unit, wherein the units are sequentially connected. The utility model has simple production process and high efficiency, and effectively reduces the production cost of the cathode material. According to the utility model, the surface density of the battery negative electrode plate is improved according to the particle shape adjustment of petroleum coke, the discharge multiplying power is effectively improved, and the material has long cycle life. According to the utility model, the proportions of different coated asphalts are set according to different granularity of raw materials, so that the electrical property of the artificial graphite anode material is best played.
Description
Technical Field
The utility model relates to the technical field of devices for preparing battery materials, in particular to a device for preparing an artificial graphite negative electrode material for a lithium ion battery.
Background
The lithium ion battery is a secondary battery, and mainly depends on the reciprocating movement of lithium ions between an anode and a cathode to realize the charge and discharge process, so the lithium ion battery is also visually called as a rocking chair battery. As the demand for green energy increases in various countries, lithium ion batteries have become a hotspot for research and development of energy science. The cathode material is used as one of the key materials of the lithium ion battery, and influences important performance indexes such as the capacity, the service life, the safety performance and the like of the lithium ion battery. At present, the negative electrode material for lithium ion batteries mainly comprises a carbon material, a transition metal oxide, an alloy material, a silicon material, a lithium-containing transition metal nitride, a lithium titanate material and the like, wherein the carbon material mainly comprises graphite, hard carbon, soft carbon and the like.
However, among the materials used as carbon cathodes, only the beaded carbon, natural graphite and artificial graphite are mature. The microbead carbon has good circulation performance, but the current consumption is not very large compared with natural graphite and artificial graphite due to lower capacity; the natural graphite has low intercalation potential and excellent intercalation and deintercalation performance, is a good lithium ion battery cathode material, but has general cycle performance and is mainly used on digital batteries; although the cycle performance of artificial graphite is slightly better than that of natural graphite, the artificial graphite has the defects of difficult processing, low capacity, large rebound and the like.
Patent CN104900878A discloses a method for producing an artificial graphite negative electrode material of a lithium ion battery, which comprises the steps of adding single or multiple transition metal elements into main material petroleum coke in a coarse powder state, and then graphitizing, wherein the method has certain defects: because the particles of petroleum coke are coarse, even at the ultrahigh temperature graphitization temperature, the uniform graphitization of the inside of the main material is difficult to ensure, and the capacity of the negative electrode material is finally exerted.
The patent CN105390673B takes highly graphitized material as raw material, and prepares the high-capacity graphite cathode through crushing, granulating, graphitizing and carbon coating. The first discharge capacity reaches 346.2, the compaction is 1.26, and the multiplying power is 1C. Although the capacity is improved, the multiplying power can only reach 1C, and the quick-charging performance still cannot meet the current market demands.
Patent CN113697805a uses graphitized raw materials as raw materials, and prepares a fast-charging high-compaction high-capacity artificial graphite negative electrode material through grinding, surface treatment, granulation, graphitization and carbon cladding carbonization, wherein the capacity can meet the requirement, but the low-temperature performance can not be ensured, the cycle discharge times can not be realized, the fast-charging requirement can be met, but the requirement of high energy storage can not be met.
Disclosure of Invention
In order to solve the problems, the utility model provides a device for preparing an artificial graphite anode material for a lithium ion battery, which takes petroleum coke as a raw material, and performs polymerization carbonization with asphalt, so that the electrical conductivity, the thermal conductivity and the high temperature resistance can be obviously improved; and then the artificial graphite anode material is formed by secondary coating carbonization, so that the anode material with good low-temperature property, high capacity and long cycle life, which is suitable for energy storage and power type lithium batteries, is obtained.
The battery cathode material is still the dominant artificial graphite material in the application. Natural graphite has the advantages of high capacity, easy expansion and quick attenuation, which is a disadvantage of the natural graphite to be improved, and only artificial graphite has the advantages of high capacity and good circulation.
In order to achieve the above object, the present utility model provides the following technical solutions:
according to a first aspect of the present utility model, there is provided an apparatus for preparing an artificial graphite negative electrode material for a lithium ion battery, comprising:
the device comprises a material coarse crushing and drying unit, a mechanical grinding and shaping unit, a modification unit, a depolymerization unit, a graphitization unit, a carbonization unit and a post-treatment unit, wherein the units are sequentially connected.
Further, the material coarse crushing and drying unit comprises an original material feeding bin, a feeding belt, a raw material coarse crushing unit, a coarse crushing and drying unit and a cooling screw conveyor; wherein, stone tar raw materials in the raw material adding bin enter a raw material coarse crushing unit through a feeding belt for coarse crushing, the coarse crushed materials are dried in a coarse crushing and drying unit, and the dried materials enter a mechanical grinding unit through a cooling screw conveyor.
Further, the mechanical grinding shaping unit comprises a coarse powder feeding bin, a grinding unit, a particle size grading unit, a shaping unit, a first grinding pipeline, a second grinding pipeline and a third grinding pipeline; coarse powder in the coarse crushing and drying unit enters a coarse powder feeding bin for storage and then enters a grinding unit, ground materials enter a particle size grading unit through a first grinding pipeline, the particle size of the graded composite condition enters a shaping unit through a second grinding pipeline, and the shaped materials enter a modification unit through a third grinding pipeline.
Further, the modification unit comprises a fine powder feeding bin and a modification reaction kettle, wherein the material shaped in the mechanical grinding shaping unit enters the fine powder feeding bin for storage, and then enters the modification reaction kettle from the fine powder feeding bin for modification, and the modified material enters the depolymerization unit.
Further, the depolymerization unit comprises a modified powder feeding bin, a depolymerizer host, a depolymerizer, a first depolymerization pipeline and a second depolymerization pipeline, and the graphitization unit comprises a graphitization furnace; the modified material enters a modified powder feeding bin, a depolymerization machine host is opened, the material in the modified powder feeding bin enters a depolymerization machine for depolymerization through a first depolymerization pipeline, the depolymerized material enters a graphitization furnace for graphitization through a second depolymerization pipeline, and the graphitized material after the treatment enters a carbonization unit; the graphitizing furnace is a box-type graphitizing furnace.
Further, the carbonization unit comprises a graphitized material feed inlet, a mixer and a roller kiln; the treated graphitized materials enter a mixer through a graphitized material feed inlet to be mixed uniformly, the uniformly mixed materials enter a roller kiln to be carbonized, and the carbonized materials enter a post-treatment unit.
Further, the post-treatment unit comprises a carbonized material bin, a carbonized material mixer, screening equipment, demagnetizing equipment and packaging equipment; wherein, the carbonized material enters the carbonized material bin for storage, and then the carbonized material bin sequentially passes through the carbonized material mixer, the screening device, the demagnetizing device and the packaging device for mixing, screening, demagnetizing and packaging.
According to a second aspect of the present utility model, there is provided a method for preparing an artificial graphite negative electrode material for a lithium ion battery using the above-described unit, comprising:
step one, raw material treatment
Coarse crushing and drying the petroleum coke to obtain coarse petroleum coke powder, and carrying out fine powder reshaping treatment on the coarse petroleum coke powder to obtain fine petroleum coke powder; carrying out micronization treatment on asphalt to obtain fine powder asphalt;
step two, modifying
Carrying out modification treatment on the fine petroleum coke powder and the fine asphalt powder to obtain a granulating material;
step three, depolymerizing
Carrying out depolymerization treatment on the granulating material to obtain a negative electrode precursor product;
step four, graphitizing treatment
Placing the cathode precursor product in a box-type graphitizing furnace for high-temperature graphitizing treatment to obtain graphitized materials;
step five, carbonization
Adding 1.5-3% of crushed asphalt into graphitized materials, uniformly mixing in a mixer, and then entering a roller kiln for carbonization under the protection of nitrogen at 900-1200 ℃ to obtain carbonized materials;
step six, post-treatment
And mixing, sieving, demagnetizing and packaging the carbonized materials to obtain the artificial graphite cathode material for the lithium ion battery.
Further, in the first step, the petroleum coke is coarsely crushed by a shearing crusher;
and/or the grain size of the coarse petroleum coke is less than or equal to 5mm;
and/or, the water content of the petroleum coke after coarse crushing and drying is less than 3%.
Further, the petroleum coke is 2#A low-sulfur petroleum coke, NB/SH/T05272015 petroleum coke or 3#A petroleum coke;
and/or the asphalt is solid asphalt with the softening point of 150-350 ℃ obtained by purifying oil asphalt;
and/or the ratio of the fine petroleum coke powder to the fine asphalt powder is (85-97): 3-15.
Further, in the second step, inert gas is filled in advance in the modification reaction kettle, wherein the inert gas is used for exhausting air in the reaction kettle, and the inert gas includes, but is not limited to, nitrogen.
Further, in the second step, the fine petroleum coke and the fine asphalt powder in the modification reaction kettle are stirred for 2 hours at 200-400 ℃, heated to 650 ℃, and statically modified for 6 hours in a temperature curve at 650 ℃ under the protection of inert gas to obtain the granulating material.
Further, the modification reaction kettle is a vertical heating reaction kettle or a horizontal cooling kettle.
In the fourth step, the high temperature graphitization treatment method is that the temperature of the box type graphitization furnace is gradually increased, the temperature is increased to 2300 ℃ until 3000 ℃, and the treatment is carried out for 8 hours.
According to the utility model, the box-type graphitizing furnace is adopted to heat the granulated material, the material is gradually heated, the interval between graphite layers is gradually reduced along with the temperature rise, the graphite layer is obviously changed when reaching 2300 ℃, the change tends to be slow when reaching 3000 ℃, and the graphitizing process is completed.
The utility model adopts the box type graphitizing furnace to heat slowly, the electrifying period can reach 90-98h, the furnace core temperature can reach 2800-3000 ℃, the furnace core temperature is uniform, the energy consumption is lower, the power consumption is lower than that of the serial graphitizing furnace by 3000-5000kW.h/t, the product quality is better, the capacity of the box type graphitizing furnace is large, about 50-200 t/furnace, the capacity is far higher than that of the internal graphitizing furnace, and the raw material consumption is less.
Further, the carbonization equipment is vertical carbonization furnace equipment.
According to the third aspect of the utility model, the artificial graphite anode material prepared by the preparation method is provided.
The utility model has the following advantages:
the utility model ensures that the prepared artificial graphite anode material has stable mechanical strength and can obviously improve the conductivity, the thermal conductivity and the high temperature resistance through the granulation process.
The artificial graphite negative electrode material for the lithium ion battery, which is prepared by the utility model, has good low-temperature property, high capacity and long cycle life, and is suitable for energy storage and power type lithium batteries.
The utility model has simple production process and high efficiency, and effectively reduces the production cost of the cathode material. According to the utility model, the surface density of the battery negative electrode plate is improved according to the particle shape adjustment of petroleum coke, the discharge multiplying power is effectively improved, and the material has long cycle life. According to the utility model, the proportions of different coated asphalts are set according to different granularity of raw materials, so that the electrical property of the artificial graphite anode material is best played.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those of ordinary skill in the art that the drawings in the following description are exemplary only and that other implementations can be obtained from the extensions of the drawings provided without inventive effort.
The structures, proportions, sizes, etc. shown in the present specification are shown only for the purposes of illustration and description, and are not intended to limit the scope of the utility model, which is defined by the claims, so that any structural modifications, changes in proportions, or adjustments of sizes, which do not affect the efficacy or the achievement of the present utility model, should fall within the ambit of the technical disclosure.
FIG. 1 is a diagram of an apparatus for preparing an artificial graphite negative electrode material for a lithium ion battery according to the present utility model;
FIG. 2 is a diagram of a coarse crushing and drying unit for materials;
FIG. 3 is a diagram of a mechanical polishing and shaping unit according to the present utility model;
FIG. 4 is a diagram of a modification unit provided by the utility model;
FIG. 5 is a diagram of a depolymerization unit provided by the utility model;
FIG. 6 is a diagram of a graphitizing unit according to the present utility model;
FIG. 7 is a diagram of a carbonization unit according to the present utility model;
FIG. 8 is a diagram of a post-processing unit provided by the utility model;
fig. 9 is a process flow diagram of an artificial graphite negative electrode material for preparing a lithium ion battery.
FIG. 10 is a view of a fine-powder petroleum coke electron microscope provided by the utility model;
fig. 11 is a view of an electron microscope after granulation provided by the utility model.
In the figure, a 1-material coarse crushing and drying unit, a 11-raw material feeding bin, a 12-feeding belt, a 13-raw material coarse crushing unit, a 14-coarse crushing and drying unit and a 15-cooling screw conveyor are shown;
2-mechanical grinding shaping unit, 21-coarse powder feeding bin, 22-grinding unit, 23-particle size classifying unit, 24-shaping unit, 25-first grinding pipeline, 26-second grinding pipeline and 27-third grinding pipeline;
3-modification units, 31-fine powder feeding bins and 32-modification reaction kettles;
4-depolymerization units, 41-modified powder feeding bins, 42-depolymerization machine hosts, 43-depolymerization machines, 44-first depolymerization pipelines and 45-second depolymerization pipelines;
a 5-graphitizing unit, a 51-graphitizing furnace;
6-carbonization unit, 61-graphitized material feed inlet, 62-roller kiln and 63-mixer;
7-post-treatment unit, 71-material bin after carbonization, 72-material mixer after carbonization, 73-screening equipment, 74-demagnetizing equipment and 75-packaging equipment.
Detailed Description
Other advantages and advantages of the present utility model will become apparent to those skilled in the art from the following detailed description, which, by way of illustration, is to be read in connection with certain specific embodiments, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1
This example provides an apparatus for preparing artificial graphite negative electrode material for lithium ion batteries, as shown in fig. 1.
An apparatus for preparing an artificial graphite negative electrode material for a lithium ion battery, comprising:
the device comprises a material coarse crushing and drying unit 1, a mechanical grinding and shaping unit 2, a modification unit 3, a depolymerization unit 4, a graphitization unit 5, a carbonization unit 6 and a post-treatment unit 7, which are sequentially connected.
Further, the material coarse crushing and drying unit 1 comprises an original material feeding bin 11, a feeding belt 12, a raw material coarse crushing unit 13, a coarse crushing and drying unit 14 and a cooling screw conveyor 15; wherein, stone tar raw materials in the raw material feeding bin 11 enter a raw material coarse crushing unit 13 through a feeding belt 12 for coarse crushing, the coarse crushed materials are dried in a coarse crushing and drying unit 14, and the dried materials enter a mechanical grinding unit after being cooled by a cooling screw conveyor 15, as shown in fig. 2.
Further, the mechanical grinding shaping unit 2 comprises a coarse powder feeding bin 21, a grinding unit 22, a particle size grading unit 23, a shaping unit 24, a first grinding pipeline 25, a second grinding pipeline 26 and a third grinding pipeline 27; wherein coarse powder in the coarse crushing and drying unit 1 enters a coarse powder feeding bin for storage 21, then enters a grinding unit 22, ground materials enter a particle size classification unit 23 through a first grinding pipeline 25, the particle sizes of the classified composite conditions enter a shaping unit 24 through a second grinding pipeline 26, and the shaped materials enter a modification unit through a third grinding pipeline 27, as shown in fig. 3.
Further, the modifying unit 3 includes a fine powder feeding bin 31 and a modifying reaction kettle 32, wherein the material shaped in the mechanical grinding shaping unit 2 enters the fine powder feeding bin for storage 31, and then enters the modifying reaction kettle 32 from the fine powder feeding bin for modification, and the modified material enters the depolymerizing unit 4, as shown in fig. 4.
Further, the depolymerization unit 4 includes a modified powder charging bin 41, a depolymerizer main unit 42, a depolymerizer 43, a first depolymerization pipe 44, and a second depolymerization pipe 45 as shown in fig. 5, and the graphitization unit 5 includes a graphitization furnace 51 as shown in fig. 6; wherein, the material modified by the modification unit 3 enters the modified powder feeding bin 41, after the depolymerization machine host 42 is opened, the material in the modified powder feeding bin 41 enters the depolymerization machine 43 for depolymerization through the first depolymerization pipeline 44, the depolymerized material enters the graphitization furnace 51 for graphitization through the second depolymerization pipeline 45, and the graphitized material after the treatment enters the carbonization unit 6; the graphitizing furnace is a box-type graphitizing furnace.
Further, the carbonization unit 6 comprises a graphitized material feed port 61, a roller kiln 62 and a mixer 63; wherein the treated graphitized material enters a mixer 63 through a graphitized material feed inlet 61 and is uniformly mixed, the mixed material enters a roller kiln 62 for carbonization, and the carbonized material enters a post-treatment unit 7 as shown in fig. 7.
Further, the post-treatment unit comprises a carbonized material bin 71, a carbonized material mixer 72, a screening device 73, a demagnetizing device 74 and a packaging device 75; wherein, the carbonized material enters the carbonized material bin 71 for storage, and then the carbonized material bin 71 is sequentially subjected to mixing, sieving, demagnetizing and packaging by the carbonized material mixer 72, the sieving device 73, the demagnetizing device 74 and the packaging device 75, as shown in fig. 8.
Example 2
This example provides a method for preparing an artificial graphite negative electrode material for a lithium ion battery using the apparatus of example 1, the process is as shown in figure 9,
step one, raw material pretreatment
Firstly, crushing petroleum coke by using a shearing type crusher until the particle size is less than or equal to 5mm, and drying until the water content is less than 3% to obtain coarse petroleum coke;
selecting the coated asphalt as solid asphalt with the softening point of 250+/-5 ℃ which is obtained by purifying oil asphalt;
coarse petroleum coke powder is crushed, dried and mechanically ground to form fine powder, and the fine powder is reshaped to obtain fine petroleum coke powder with the particle size of 10.0+/-1.0 mu m; carrying out micronization treatment on the coated asphalt to obtain fine powder asphalt with the particle size of 5.0+/-1.0 mu m, and carrying out fine powder petroleum coke: fine pitch = 97:3 is added to modification unit 3;
step two, modifying
Filling inert gas nitrogen into the modification reaction kettle in advance, wherein the inert gas is used for exhausting air in the reaction kettle;
feeding fine-powder petroleum coke and fine-powder asphalt into a nitrogen modification reaction kettle through a fine-powder feeding bin, stirring the fine-powder petroleum coke and the fine-powder asphalt for 2 hours at 300 ℃, heating to 650 ℃, and carrying out static modification for 6 hours in a 650 ℃ temperature curve under the protection of inert gas for 8 hours to obtain a modified material with the particle size of 17.0+/-2.0 mu m;
step three, depolymerization treatment
Storing the modified material in a modified powder feeding bin 41, opening a depolymerizer host 42, and allowing the modified material in the modified powder feeding bin 41 to enter a depolymerizer 43 through a first depolymerization pipeline 44 for depolymerization to obtain a depolymerized precursor product;
step four, graphitizing treatment
Cooling the depolymerized precursor product by a secondary kettle, then placing the depolymerized precursor product into a box-type graphitizing furnace, gradually heating to 2300 ℃, and treating for 8 hours to obtain a graphitized precursor;
step four, carbonization
Adding the graphitized precursor and 1.5-3% of crushed asphalt into a mixer, uniformly mixing, and then entering a roller kiln to carry out high-temperature carbonization treatment for 4 hours at 1050 ℃, and carrying out secondary cladding carbonization treatment to obtain carbonized materials;
step five, post-treatment
And storing the carbonized material in a carbonized material bin 71, and then mixing, screening, demagnetizing and packaging the carbonized material by a carbonized material mixer 72, a screening device 73, a demagnetizing device 74 and a packaging device 75 to obtain the artificial graphite anode material for the lithium ion battery.
Example 3
This example provides a method for preparing an artificial graphite negative electrode material for a lithium ion battery using the apparatus of example 1, the process is as shown in figure 9,
step one, raw material pretreatment
Firstly, crushing needle Jiao Shengjiao to a particle size less than or equal to 5mm by using a shearing type crusher, and drying until the water content is less than 3% to obtain coarse petroleum coke;
selecting the coated asphalt as solid asphalt with the softening point of 250+/-5 ℃ which is obtained by purifying oil asphalt;
coarse powder needle Jiao Shengjiao is coarsely crushed, dried and mechanically ground and shaped into fine powder to obtain fine powder with the particle diameter of 9.0+/-1.0 mu m; carrying out micronization treatment on the coated asphalt to obtain fine powder asphalt with the particle size of 5.0+/-1.0 mu m, and carrying out needle Jiao Shengjiao fine powder: pitch fines = 85:15 added to modification unit 3;
step two, modifying
Filling inert gas nitrogen into the modification reaction kettle in advance, wherein the inert gas is used for exhausting air in the reaction kettle;
feeding fine-powder petroleum coke and fine-powder asphalt into a nitrogen modification reaction kettle through a fine-powder feeding bin, stirring the fine-powder petroleum coke and the fine-powder asphalt for 2 hours at 300 ℃, heating to 680 ℃, and carrying out static modification for 6 hours in a 680 ℃ temperature curve under the protection of inert gas for 8 hours to obtain a modified material with the particle size of 16.0+/-2.0 mu m;
step three, depolymerization treatment
Storing the modified material in a modified powder feeding bin 41, opening a depolymerizer host 42, and allowing the modified material in the modified powder feeding bin 41 to enter a depolymerizer 43 through a first depolymerization pipeline 44 for depolymerization to obtain a depolymerized precursor product;
step four, graphitizing treatment
Cooling the depolymerized precursor product by a secondary kettle, then placing the depolymerized precursor product into a box-type graphitizing furnace, gradually heating to 2300 ℃, and treating for 8 hours to obtain a graphitized precursor;
step four, carbonization
Adding the graphitized precursor and 1.5-3% of crushed asphalt into a mixer, uniformly mixing, and then entering a roller kiln to carry out high-temperature carbonization treatment for 6 hours at 1100 ℃, and carrying out secondary cladding carbonization treatment to obtain carbonized materials;
step five, post-treatment
And storing the carbonized material in a carbonized material bin 71, and then mixing, screening, demagnetizing and packaging the carbonized material by a carbonized material mixer 72, a screening device 73, a demagnetizing device 74 and a packaging device 75 to obtain the artificial graphite anode material for the lithium ion battery.
Example 4
This example provides a method for preparing an artificial graphite negative electrode material for a lithium ion battery using the apparatus of example 1, the process is as shown in figure 9,
step one, raw material pretreatment
Firstly, crushing asphalt coke to a particle size less than or equal to 5mm by using a shearing type crusher, and drying until the water content is less than 3% to obtain coarse powder petroleum coke;
selecting the coated asphalt as solid asphalt with the softening point of 250+/-5 ℃ which is obtained by purifying oil asphalt;
coarse petroleum coke is subjected to coarse crushing, drying and mechanical grinding shaping to form fine powder, and the fine powder is shaped to obtain fine powder petroleum coke with the particle size of 8.5+/-0.5 mu m; carrying out micronization treatment on the coated asphalt to obtain fine powder asphalt with the particle size of 5.0+/-1.0 mu m, and carrying out fine powder petroleum coke: fine pitch = 92:8 is added to modification unit 3;
step two, modifying
Filling inert gas nitrogen into the modification reaction kettle in advance, wherein the inert gas is used for exhausting air in the reaction kettle;
feeding fine-powder petroleum coke and fine-powder asphalt into a nitrogen modification reaction kettle through a fine-powder feeding bin, stirring the fine-powder petroleum coke and the fine-powder asphalt for 2 hours at 300 ℃, heating to 650 ℃, and carrying out static modification for 6 hours in a 650 ℃ temperature curve under the protection of inert gas for 8 hours to obtain a modified material with the particle size of 16.0+/-1.0 mu m;
step three, depolymerization treatment
Storing the modified material in a modified powder feeding bin 41, opening a depolymerizer host 42, and allowing the modified material in the modified powder feeding bin 41 to enter a depolymerizer 43 through a first depolymerization pipeline 44 for depolymerization to obtain a depolymerized precursor product;
step four, graphitizing treatment
Cooling the depolymerized precursor product by a secondary kettle, then placing the depolymerized precursor product into a box-type graphitizing furnace, gradually heating to 2300 ℃, and treating for 8 hours to obtain a graphitized precursor;
step four, carbonization
Adding the graphitized precursor and 1.5-3% of crushed asphalt into a mixer, uniformly mixing, and then entering a roller kiln to carry out high-temperature carbonization treatment for 8 hours at 1000 ℃ and carrying out secondary cladding carbonization treatment to obtain carbonized materials;
step five, post-treatment
And storing the carbonized material in a carbonized material bin 71, and then mixing, screening, demagnetizing and packaging the carbonized material by a carbonized material mixer 72, a screening device 73, a demagnetizing device 74 and a packaging device 75 to obtain the artificial graphite anode material for the lithium ion battery.
Test examples
The artificial graphite anode materials prepared in examples 2 to 4 were tested, and the test results are shown in table 1.
TABLE 1
As can be seen from Table 1, by using the device of the utility model, different raw materials such as needle coke, petroleum coke, asphalt coke and the like are tested and verified, products with good performance indexes are obtained, the quality of the products is higher than that of the products with high standard, market demands can be met, and the device and the process design of the utility model have certain advantages in test and production costs.
While the utility model has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the utility model and are intended to be within the scope of the utility model as claimed.
Claims (1)
1. An apparatus for preparing an artificial graphite negative electrode material for a lithium ion battery, comprising: the device comprises a material coarse crushing and drying unit, a mechanical grinding and shaping unit, a modification unit, a depolymerization unit, a graphitization unit, a carbonization unit and a post-treatment unit, wherein the units are sequentially connected;
the raw material coarse crushing and drying unit comprises an original material feeding bin, a feeding belt, a raw material coarse crushing unit, a coarse crushing and drying unit and a cooling screw conveyor; the method comprises the steps that petroleum coke raw materials in a raw material feeding bin enter a raw material coarse crushing unit through a feeding belt, the coarse crushed materials are dried in a coarse crushing and drying unit, and the dried materials enter a mechanical grinding unit through a cooling screw conveyor;
the mechanical grinding shaping unit comprises a coarse powder feeding bin, a grinding unit, a particle size grading unit, a shaping unit, a first grinding pipeline, a second grinding pipeline and a third grinding pipeline; coarse powder in the coarse crushing and drying unit enters a coarse powder feeding bin for storage and then enters a grinding unit, ground materials enter a particle size grading unit through a first grinding pipeline, the particle size of the graded composite condition enters a shaping unit through a second grinding pipeline, and the shaped materials enter a modification unit through a third grinding pipeline;
the modification unit comprises a fine powder feeding bin and a modification reaction kettle, wherein the material shaped in the mechanical grinding shaping unit enters the fine powder feeding bin for storage, and then enters the modification reaction kettle from the fine powder feeding bin for modification, and the modified material enters the depolymerization unit;
the depolymerization unit comprises a modified powder feeding bin, a depolymerization machine host, a depolymerization machine, a first depolymerization pipeline and a second depolymerization pipeline, and the graphitization unit comprises a graphitization furnace; the modified material enters a modified powder feeding bin, a depolymerization machine host is opened, the material in the modified powder feeding bin enters a depolymerization machine for depolymerization through a first depolymerization pipeline, the depolymerized material enters a graphitization furnace for graphitization through a second depolymerization pipeline, and the graphitized material after the treatment enters a carbonization unit; the graphitizing furnace is a box type graphitizing furnace;
the carbonization unit comprises a graphitized material feed inlet, a mixer and a roller kiln; the treated graphitized materials enter a mixer through a graphitized material feed inlet and are uniformly mixed, the uniformly mixed materials enter a roller kiln for carbonization, and the carbonized materials enter a post-treatment unit;
the post-treatment unit comprises a carbonized material bin, a carbonized material mixer, screening equipment, demagnetizing equipment and packaging equipment; wherein, the carbonized material enters the carbonized material bin for storage, and then the carbonized material bin sequentially passes through the carbonized material mixer, the screening device, the demagnetizing device and the packaging device for mixing, screening, demagnetizing and packaging.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114956069A (en) * | 2022-07-07 | 2022-08-30 | 王辅志 | Device for preparing artificial graphite cathode material for lithium ion battery and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114956069A (en) * | 2022-07-07 | 2022-08-30 | 王辅志 | Device for preparing artificial graphite cathode material for lithium ion battery and preparation method thereof |
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