CN115893401B - Secondary particle artificial graphite negative electrode material and preparation method thereof - Google Patents
Secondary particle artificial graphite negative electrode material and preparation method thereof Download PDFInfo
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- 239000011163 secondary particle Substances 0.000 title claims abstract description 34
- 229910021383 artificial graphite Inorganic materials 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000007773 negative electrode material Substances 0.000 title abstract description 10
- 239000011230 binding agent Substances 0.000 claims abstract description 84
- 239000000463 material Substances 0.000 claims abstract description 45
- 239000008188 pellet Substances 0.000 claims abstract description 44
- 229920002472 Starch Polymers 0.000 claims abstract description 33
- 239000002994 raw material Substances 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000008107 starch Substances 0.000 claims abstract description 31
- 235000019698 starch Nutrition 0.000 claims abstract description 31
- 239000010426 asphalt Substances 0.000 claims abstract description 29
- 239000000203 mixture Substances 0.000 claims abstract description 27
- 239000010405 anode material Substances 0.000 claims abstract description 25
- 238000005453 pelletization Methods 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 238000012216 screening Methods 0.000 claims abstract description 10
- 239000002245 particle Substances 0.000 claims description 16
- 239000005539 carbonized material Substances 0.000 claims description 14
- 239000002006 petroleum coke Substances 0.000 claims description 13
- 229920002261 Corn starch Polymers 0.000 claims description 8
- 239000008120 corn starch Substances 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims 1
- 238000005087 graphitization Methods 0.000 abstract description 15
- 229920005989 resin Polymers 0.000 abstract description 15
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- 239000000843 powder Substances 0.000 abstract description 7
- 238000013329 compounding Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 19
- 238000010438 heat treatment Methods 0.000 description 16
- 238000001035 drying Methods 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 13
- 230000008569 process Effects 0.000 description 10
- 238000012360 testing method Methods 0.000 description 9
- 229940099112 cornstarch Drugs 0.000 description 7
- 229920001592 potato starch Polymers 0.000 description 7
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- 238000005469 granulation Methods 0.000 description 6
- 230000003179 granulation Effects 0.000 description 6
- 238000011056 performance test Methods 0.000 description 5
- 239000004925 Acrylic resin Substances 0.000 description 4
- 229920000178 Acrylic resin Polymers 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 244000017020 Ipomoea batatas Species 0.000 description 3
- 235000002678 Ipomoea batatas Nutrition 0.000 description 3
- 229920000180 alkyd Polymers 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 235000013339 cereals Nutrition 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011331 needle coke Substances 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 229920001225 polyester resin Polymers 0.000 description 3
- 239000004645 polyester resin Substances 0.000 description 3
- 229920005749 polyurethane resin Polymers 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000000498 ball milling Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000004005 microsphere Substances 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 229910021382 natural graphite Inorganic materials 0.000 description 2
- 239000001254 oxidized starch Substances 0.000 description 2
- 235000013808 oxidized starch Nutrition 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000006253 pitch coke Substances 0.000 description 2
- 229940116317 potato starch Drugs 0.000 description 2
- 239000003039 volatile agent Substances 0.000 description 2
- 229940100445 wheat starch Drugs 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
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- 238000010276 construction Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
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- 230000002687 intercalation Effects 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
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- 239000007787 solid Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000003232 water-soluble binding agent Substances 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The application relates to the field of preparation of negative electrode materials, in particular to a secondary particle artificial graphite negative electrode material and a preparation method thereof, wherein the preparation method comprises the following steps: uniformly mixing the cathode raw material with the binder, adding water, stirring to obtain a wet material, and performing pelletization on the wet material to obtain a spherical mixture; wherein the binder is formed by compounding starch binder and asphalt binder or resin binder; heat treating the spherical mixture to obtain dried and hardened pellets, and graphitizing the pellets; and crushing and screening the graphitized pellets to obtain the secondary particle artificial graphite anode material. The binder and the negative electrode raw material powder are mixed and then subjected to pelletization and graphitization treatment, partial materials of the pellets are still adhered after graphitization, and the secondary particle artificial graphite negative electrode product is obtained after crushing, scattering and screening.
Description
Technical Field
The application relates to the technical field of preparation of negative electrode materials, in particular to a secondary particle artificial graphite negative electrode material and a preparation method thereof.
Background
The artificial graphite has the remarkable advantages of good cycle performance, high-rate charge-discharge efficiency, good electrolyte compatibility and the like, and is a currently mainstream negative electrode material. Along with the explosive growth of power and energy storage markets, the market puts forward new demands on artificial graphite, such as better multiplying power performance, longer service life and lower cost, in order to improve multiplying power and cycle performance of materials, granulation is an important process link, and secondary particles formed after granulation can not only increase lithium intercalation points and improve multiplying power performance, but also reduce expansion of pole pieces and prolong service life. To reduce the cost, new graphitization methods such as box furnaces and continuous furnaces are gradually maturing and becoming the mainstream. The novel graphitization brings new requirements of good air permeability, large bulk density and the like to the raw material pre-working procedures, while the traditional pre-working procedures of crushing, granulating and the like cannot well meet the new technological requirements.
The traditional granulation process is to mechanically stir and heat single-particle raw materials and solid or liquid binders in a reaction kettle to finish the construction of single particles to a plurality of particle structures. For example, chinese patent CN109956471a provides a process method for granulating a graphite negative electrode material, in which carbon source powder is put into a reaction kettle to be stirred and heated, then a liquid binder or cladding agent is sprayed onto the surface of the stirred powder to granulate, so that the later processing performance and the service performance of the negative electrode product are improved, but the process of the method is complex, and the method is only suitable for graphitizing in a traditional acheson furnace, and cannot form linkage with novel graphitizing modes such as a box furnace, a continuous furnace and the like.
Disclosure of Invention
The application mainly aims to provide a secondary particle artificial graphite anode material and a preparation method thereof, and aims to solve the technical problems that the existing anode material is prepared by granulating, the preparation steps are complex, and the applicable mode of subsequent graphitization is narrow.
In order to achieve the above purpose, the application provides a preparation method of a secondary particle artificial graphite anode material, which comprises the following steps: uniformly mixing the cathode raw material with the binder, adding water, stirring to obtain a wet material, and performing pelletization on the wet material to obtain a spherical mixture; wherein the binder is formed by compounding a starch binder and an asphalt binder or a resin binder;
heat treating the spherical mixture to obtain dried and hardened pellets, and graphitizing the pellets;
and crushing and screening the graphitized pellets to obtain the secondary particle artificial graphite anode material.
The binder adopted by the scheme is formed by mixing a starch binder and an asphalt binder, or mixing a starch binder and a resin binder, and the binder has an adhesive effect on negative electrode raw material powder before and after graphitization, so that partial materials are adhered in a finished product prepared at high temperature, and the obtained product is a secondary particle negative electrode product.
The traditional preparation process comprises the steps of mixing materials and a binder, stirring in a reaction kettle at about 600 ℃, and graphitizing to obtain a secondary particle anode product; according to the scheme, the materials and the binder are directly mixed and then subjected to sphericizing, and then the mixture is placed into a graphitizing furnace to be graphitized, so that a secondary granulating product can be obtained, the traditional granulating process is reduced, and the cost is reduced; meanwhile, besides the traditional Acheson furnace, the box furnace and the continuous graphitizing furnace can be adopted for graphitizing, so that the application range is wider.
In the scheme, the cathode raw material and the binder are uniformly mixed in a physical mode, such as a mixing mode of VC, stirring, ball milling, wheel milling and the like. After the anode material and the binder are uniformly mixed, adding water to prepare wet materials, wherein the wet materials are more beneficial to the formation of subsequent pellets, and the water and the mixed materials are also physically mixed, such as spraying, stirring, ball milling and wheel milling; then, the wet material is subjected to pelletization, namely, the wet material is extruded or spun to form by adopting the action of mechanical force, and equipment in the pelletization can be a die press, a ball press, a strip extruder, a kneader, a pelletization machine, a balling machine and the like, and the prepared pellets can be pellets with a single shape or size or can be a mixture of pellets with various shapes or sizes; the pellets can be blocks with the weight of 0-20kg, spheres or ellipsoids with the diameter of 3-50m, and strips or rhomboids with the diameter of 3-50 mm. And finally graphitizing the prepared pellets, and crushing the pellets to obtain the secondary particle artificial graphite anode material.
Preferably, the starch-based binder is a natural water-soluble starch; the asphalt binder is water-soluble asphalt; the resin binder is a water-soluble resin. The binder adopted in the scheme is a water-soluble binder, can be directly dissolved in water, is favorable for subsequent balling treatment, and can ensure that the prepared secondary particle artificial graphite negative electrode material has better performance.
Preferably, the natural water-soluble starch is at least one of corn starch, wheat starch, potato starch, sweet potato starch, gelatinized starch, oxidized starch and esterified starch; the water-soluble asphalt is sulfonated asphalt;
The water-soluble resin is at least one of water-based polyurethane resin, water-based acrylic resin, water-based alkyd resin, water-based epoxy resin and water-based polyester resin. When the specific binder is adopted, the obtained product has the best performance improvement effect.
Preferably, the weight ratio of the starch-based binder to the asphalt-based binder or the resin-based binder is 3-5:3-6. The formed binder can adapt to various cathode raw materials and graphitization conditions by adjusting the dosages of the starch binder and the asphalt binder or the resin binder, and the application range is wider.
Preferably, the mass ratio of the binder to the negative electrode raw material is 100: (5-30). The binder in the scheme is less in dosage, and the prepared secondary particle artificial graphite anode material is better in quality.
Preferably, the pellet after heat treatment has a volatile content of less than 3% and a moisture content of less than 2%; the heat treatment step is natural airing drying or heating drying. The pellets are subjected to heat treatment to remove moisture and volatile matters in the pellets, so that the dried and hardened pellets are obtained, and other heat treatment modes except natural airing and drying can be adopted by equipment such as an oven, a drying kiln, a rotary kiln and the like.
Preferably, the heating and drying are carried out to 90-150 ℃; or heating to 700-1200deg.C during heating and drying. When the material is heated to 700-1200 ℃, the secondary particle artificial graphite negative electrode material has better performance.
Preferably, the cathode raw material is crushed material prepared by crushing at least one of petroleum coke, pitch coke, needle coke, mesophase carbon microspheres, coal and natural graphite. The above-mentioned negative electrode raw material may be carbonized or not carbonized.
Preferably, the particle size of the negative electrode raw material is 5-18 μm, and the volatile matter is 0-14%. The quality of the prepared pellets can be ensured by limiting the conditions of the cathode raw material, and the product requirement can be better met.
Preferably, when water is added and stirred, the mass ratio of the total mass of the mixture of the negative electrode raw material and the binder to the water is 100 (10-40).
In addition, the invention also discloses a secondary particle artificial graphite anode material which is prepared by the preparation method of any secondary particle artificial graphite anode material.
The preparation method of the secondary particle artificial graphite anode material has the following beneficial effects: according to the scheme, the binder and the negative electrode raw material powder are directly mixed and then subjected to balling and graphitizing treatment, part of materials of the pellets are still adhered together after graphitizing, and the secondary particle artificial graphite negative electrode product is obtained after crushing, scattering and screening. Compared with the traditional production process, the method reduces the granulation process, can greatly reduce the production cost and improves the multiplying power and the cycle performance of the material. In addition, the negative electrode raw material powder is extruded and molded through the pelletization treatment, so that the pellet density can be improved, the charging quantity can be improved, the air permeability can be improved, the overflow of volatile gas is facilitated, and the potential safety hazard existing in the novel graphitization operation process is greatly reduced.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
The application provides a preparation method of a secondary particle artificial graphite anode material, which comprises the following steps:
Uniformly mixing the cathode raw material with the binder, adding water, stirring to obtain a wet material, and performing pelletization on the wet material to obtain a spherical mixture; wherein the binder is formed by compounding a starch binder and an asphalt binder or a resin binder;
the mass ratio of the binder to the cathode raw material is 100: (5-30); the weight ratio of the starch binder to the asphalt or the resin is 3-5:3-6; the mass ratio of the mixture of the negative electrode raw material and the binder to the water is 100 (10-40);
the starch binder is natural water-soluble starch; the asphalt binder is water-soluble asphalt; the resin binder is water-soluble resin;
the natural water-soluble starch is at least one of corn starch, wheat starch, potato starch, sweet potato starch, gelatinized starch, oxidized starch and esterified starch;
The water-soluble asphalt is sulfonated asphalt;
the water-soluble resin is at least one of water-based polyurethane resin, water-based acrylic resin, water-based alkyd resin, water-based epoxy resin and water-based polyester resin;
The cathode raw material is crushed materials prepared by crushing at least one of petroleum coke, pitch coke, needle coke, mesophase carbon microspheres, coal and natural graphite; the grain diameter of the cathode raw material is 5-18 mu m, and the volatile matter is 0-14%;
Heat treating the spherical mixture to obtain dried and hardened pellets, and graphitizing the pellets; wherein the heat treatment step is natural airing drying or heating drying, the volatile content of the pellets after heat treatment is lower than 3%, and the moisture content is lower than 2%; heating to 90-150deg.C during heating and drying; or heating to 700-1200deg.C during heating and drying;
and crushing and screening the graphitized pellets to obtain the secondary particle artificial graphite anode material.
The following description of the embodiments of the present application will be presented in further detail with reference to the examples, which should be understood as being merely illustrative of the present application and not limiting.
Example 1
The preparation method of the secondary particle artificial graphite anode material comprises the following steps:
preparing potato starch and sulfonated asphalt according to a mass ratio of 3:5 to obtain a binder;
uniformly mixing asphalt coke Shan Keli carbonized materials with the binder according to the weight ratio of 100:5; the particle size of the single-particle uncarbonized material of the asphalt petroleum coke is 10 mu m, and the volatile matter is 6%;
Adding water into the mixed materials and uniformly stirring by using an edge runner mill to obtain wet materials, wherein the mass ratio of the mixture of the negative electrode raw materials and the binder to the water is 100:15, and then, placing the wet materials in a molding press for pelletization to obtain a spherical mixture;
the spherical mixture was placed in an oven and heat treated at 150 ℃ to obtain dry hardened pellets.
Graphitizing the pellets by adopting a box furnace, and crushing and screening the graphitized pellets to obtain the secondary particle artificial graphite anode material.
Example 2
The preparation method of the secondary particle artificial graphite anode material comprises the following steps:
Sweet potato starch, esterified starch and sulfonated asphalt are prepared according to a mass ratio of 2:1:2 (starch binder: asphalt binder=3:2) to obtain a binder;
Uniformly mixing the needle coke Shan Keli carbonized material with the binder according to the weight ratio of 100:10; the particle diameter of the needle Jiao Shan granule carbonized material is 20 μm, and the volatile matter is 15%;
Adding water into the mixed materials, spraying and uniformly stirring by using a spraying machine to obtain wet materials, wherein the mass ratio of the mixture of the cathode raw material and the binder to the water is 100:20, and then, placing the wet materials in a ball press for pelletization to obtain a spherical mixture;
the spherical mixture was placed in a box furnace and heat-treated at 1000 c to obtain dry hardened pellets.
Graphitizing the pellets by using an Acheson furnace, and crushing and screening the graphitized pellets to obtain the secondary particle artificial graphite anode material.
Example 3
The preparation method of the secondary particle artificial graphite anode material comprises the following steps:
preparing esterified starch and aqueous acrylic resin according to a mass ratio of 4:5 to obtain a binder;
Uniformly mixing the petroleum coke single-particle non-carbonized material with the binder according to the weight ratio of 100:15 by using a VC machine; the grain diameter of the single-grain non-carbonized material of the petroleum coke is 9 mu m, and the volatile matter is 10%;
Adding water into the mixed materials and uniformly stirring by using an edge runner mill to obtain wet materials, wherein the mass ratio of the mixture of the negative electrode raw materials and the binder to the water is 100:30 to obtain the wet materials, and then, placing the wet materials in a ball press for pelletization to obtain a spherical mixture;
the spherical mixture was placed in a box furnace and heat-treated at 700 c to obtain dry hardened pellets.
Graphitizing the pellets by adopting a continuous graphitizing furnace, and crushing and screening the graphitized pellets to obtain the secondary particle artificial graphite anode material.
Example 4
The preparation method of the secondary particle artificial graphite anode material comprises the following steps:
The gelatinized starch, the water-based alkyd resin and the water-based polyester resin are prepared according to the mass ratio of 4:3:3 (starch-based binder: resin-based binder=4:6) to obtain a binder;
Uniformly mixing the petroleum coke single-particle carbonized material with the binder according to the weight ratio of 100:15 by using a VC machine; the grain diameter of the petroleum coke single-grain carbonized material is 13 mu m, and the volatile matters are 10 percent;
Adding water into the mixed materials and uniformly stirring by using an edge runner mill to obtain wet materials, wherein the mass ratio of the mixture of the negative electrode raw materials and the binder to the water is 100:30 to obtain the wet materials, and then, placing the wet materials in a ball press for pelletization to obtain a spherical mixture;
Naturally airing and drying the spherical mixture, wherein the temperature is 25-35 ℃ (heat treatment) during natural airing, and obtaining the dried and hardened pellets.
Graphitizing the pellets by adopting a box furnace, and crushing and screening the graphitized pellets to obtain the secondary particle artificial graphite anode material.
Comparative example 1
The conditions in this comparative example were the same as in example 1, except that: in this comparative example, a single starch-based binder, potato starch, was used in combination with pitch Jiao Shan granular carbonized material.
Comparative example 2
The conditions in this comparative example were the same as in example 1, except that: the comparative example used a single asphalt binder-sulfonated asphalt mixed with asphalt Jiao Shan particulate carbonized material.
Comparative example 3
The conditions in this comparative example were the same as in example 3, except that: the comparative example uses a single resin binder-aqueous acrylic resin mixed with a single particle of petroleum coke non-carbonized material.
Comparative example 4
The conditions in this comparative example were the same as in example 3, except that: the present comparative example uses esterified starch in combination with polyvinyl alcohol to form a binder which is then mixed with the single particle non-carbonized material of petroleum coke.
The products obtained in examples 1 to 4 and comparative examples 1 to 4 were subjected to performance tests, and the specific test results are shown in the following table:
As can be seen from the test data of the table, when the method is used in the graphitization process, the charging density is obviously improved, and gaps among pellets are beneficial to the ventilation of materials and the overflow of volatile matters; the negative electrode product graphitized by the method has the advantages of increased molding proportion, smaller specific surface area and reduced granulation process, but the raw material powder also realizes the granulation effect, and the production cost is greatly reduced.
Example 5
The conditions in this example were the same as in example 4, except that the drying conditions were: the spherical mixture was placed in an oven and dried at 100 ℃.
Example 6
The conditions in this example were the same as in example 4, except that the drying conditions were: the spherical mixture was placed in a box oven and dried at 1000 ℃.
The products obtained in examples 5 to 6 were subjected to performance tests, and the specific test results are shown in the following table:
As is clear from the test data in the table, the bonding effect of example 5 and example 6 was better than that of example 4, the charging density during graphitization was reduced, and the molding ratio of pellets after graphitization was improved. When the drying temperature is raised to 700-1200 ℃, the performance of the product is better.
Example 7
The conditions in this example were the same as in example 2, except that the particle size of the monocarbonated petroleum coke material was 10 μm and the volatiles were 9% (example 2 particle size 20 μm and volatiles 15%).
The product obtained in example 7 was subjected to performance tests, and the specific test results are shown in the following table:
The negative electrode raw material used in example 7 was reduced in particle size and volatile matter as compared with example 2, which was advantageous in improving the rate and cycle performance of the material.
Example 8
The conditions in this example were the same as in example 7, except that the binder of this example was changed and the binder was adjusted to a binder composed of cornstarch, esterified starch and sulfonated asphalt. The mass ratio was kept the same as in example 7.
Example 9
In this example, the conditions were the same as in example 3, except that the binder in this example was changed, the mass ratio of the binder was also kept consistent, and the following table was specifically adjusted:
| Raw material of adhesive | |
| Example 9-1 | Corn starch and aqueous polyurethane resin |
| Example 9-2 | Corn starch and aqueous epoxy resin |
The products obtained in example 8 and example 9 were subjected to performance tests, and the specific test results are shown in the following table:
As can be seen from the test data in the table, compared with the embodiment 7 and the embodiment 3, the embodiment 8, the embodiment 9-1 and the embodiment 9-2 are all the preferable binders, the bonding effect is better, the charging density in the graphitization process can be improved, the graphitization cost is reduced, and the quality of the cathode finished product can be better ensured; the forming proportion of the graphitized pellets is increased, and the graphitized pellets are crushed and sieved, so that the granulating effect is realized, and the multiplying power and the cycle performance of the material are improved.
Example 10
The conditions in this example were the same as in example 8, except that the mass ratio of corn starch, esterified starch and sulfonated asphalt was adjusted from 2:1:2 to 2:1:5 (starch-based binder: asphalt-based binder=3:5).
Example 11
The conditions in this example were the same as in example 8, except that the mass ratio of corn starch, esterified starch and sulfonated asphalt was adjusted from 2:1:2 to 2:6 (starch-based binder: asphalt-based binder=4:6).
The products obtained in examples 10 to 11 were subjected to performance tests, and the specific test results are shown in the following table:
from the test data in the table, compared with example 8, examples 10 to 11 were adjusted to the preferred mass ratio, and the charging density during graphitization was improved, and the molding ratio after graphitization was increased, which showed that the mass ratio of the composite binder was increased, the adhesion effect of the composite binder was enhanced, and the negative electrode raw material was granulated.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the scope of the application, and all equivalent structural changes made by the content of the present application or direct/indirect application in other related technical fields are included in the scope of the present application.
Claims (2)
1. The preparation method of the secondary particle artificial graphite anode material is characterized by comprising the following steps of:
Uniformly mixing the cathode raw material with the binder, adding water, stirring to obtain a wet material, and performing pelletization on the wet material to obtain a spherical mixture; wherein, corn starch, esterified starch and sulfonated asphalt are prepared according to a mass ratio of 2:2:6 to obtain the binder; the cathode raw material is petroleum coke single-particle non-carbonized material, and the petroleum coke single-particle non-carbonized material and the binder are uniformly mixed according to the weight ratio of 100:10; the grain diameter of the petroleum coke single-grain non-carbonized material is 10 mu m, and the volatile matter is 9%; adding water into the mixed materials by using a spraying machine, and uniformly stirring to obtain the wet materials, wherein the mass ratio of the mixture of the cathode raw materials and the binder to the water is 100:20, and the wet materials are subjected to balling treatment by using a ball pressing machine;
heat treating the spherical mixture in a box furnace at 1000 ℃ to obtain dried and hardened pellets, and graphitizing the pellets by an Acheson furnace;
and crushing and screening the graphitized pellets to obtain the secondary particle artificial graphite anode material.
2. The secondary particle artificial graphite anode material is characterized by being prepared by the preparation method of the secondary particle artificial graphite anode material in claim 1.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR568762A (en) * | 1922-07-21 | 1924-04-01 | Manufacturing process of fuel briquettes | |
| CN114824162A (en) * | 2022-04-12 | 2022-07-29 | 湖南阿斯米科技有限公司 | Graphitization process and system for graphite negative electrode material of lithium ion battery |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2196642B (en) * | 1986-10-22 | 1990-09-26 | Inrad Limited | Process and apparatus for manufacturing agglomerated soild fuel briquettes |
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| FR568762A (en) * | 1922-07-21 | 1924-04-01 | Manufacturing process of fuel briquettes | |
| CN114824162A (en) * | 2022-04-12 | 2022-07-29 | 湖南阿斯米科技有限公司 | Graphitization process and system for graphite negative electrode material of lithium ion battery |
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