CN115028164A - Molten iron inoculated artificial graphite cathode material and manufacturing method thereof - Google Patents
Molten iron inoculated artificial graphite cathode material and manufacturing method thereof Download PDFInfo
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- CN115028164A CN115028164A CN202210708922.2A CN202210708922A CN115028164A CN 115028164 A CN115028164 A CN 115028164A CN 202210708922 A CN202210708922 A CN 202210708922A CN 115028164 A CN115028164 A CN 115028164A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 148
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 74
- 229910021383 artificial graphite Inorganic materials 0.000 title claims abstract description 40
- 239000010406 cathode material Substances 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 60
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 33
- 239000010439 graphite Substances 0.000 claims abstract description 33
- 239000002243 precursor Substances 0.000 claims abstract description 28
- 239000000843 powder Substances 0.000 claims abstract description 26
- 230000006698 induction Effects 0.000 claims abstract description 12
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 11
- 238000005087 graphitization Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000000576 coating method Methods 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 230000008569 process Effects 0.000 claims abstract description 6
- 239000011248 coating agent Substances 0.000 claims abstract description 5
- 230000005674 electromagnetic induction Effects 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims abstract description 4
- 238000001953 recrystallisation Methods 0.000 claims abstract description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000007773 negative electrode material Substances 0.000 claims description 9
- 229910021382 natural graphite Inorganic materials 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 5
- 239000011261 inert gas Substances 0.000 claims description 5
- 239000010426 asphalt Substances 0.000 claims description 4
- 238000003763 carbonization Methods 0.000 claims description 4
- 239000000571 coke Substances 0.000 claims description 4
- 239000011331 needle coke Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 2
- 239000003513 alkali Substances 0.000 claims description 2
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims description 2
- 239000003830 anthracite Substances 0.000 claims description 2
- 239000003575 carbonaceous material Substances 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 238000011049 filling Methods 0.000 claims description 2
- 229910021385 hard carbon Inorganic materials 0.000 claims description 2
- 238000003837 high-temperature calcination Methods 0.000 claims description 2
- 230000003472 neutralizing effect Effects 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims description 2
- 230000004580 weight loss Effects 0.000 claims description 2
- 230000005347 demagnetization Effects 0.000 claims 1
- 238000011081 inoculation Methods 0.000 abstract description 6
- 238000007599 discharging Methods 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 3
- 229920006395 saturated elastomer Polymers 0.000 abstract description 2
- 150000001721 carbon Chemical class 0.000 abstract 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 239000011258 core-shell material Substances 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 229920005546 furfural resin Polymers 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/20—Graphite
- C01B32/205—Preparation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/021—Physical characteristics, e.g. porosity, surface area
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
-
- 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
Abstract
The invention provides an iron melt inoculation artificial graphite cathode material and a manufacturing method thereof, wherein the iron melt inoculation artificial graphite cathode material is economic and environment-friendly, has high energy utilization efficiency, high production speed, good sphericity, high first-order efficiency and large gram capacity, and is characterized in that the iron melt inoculation artificial graphite cathode material utilizes the high saturation solubility of the iron melt to carbon in a high-temperature range of 1750 plus 2000 ℃, realizes the surface corrosion and sphericization of the iron melt to graphite precursor fine powder, utilizes the electromagnetic induction stirring function, utilizes the high-temperature iron melt to form surface friction to the graphite precursor fine powder, accelerates the stress induction recrystallization in the fine powder, and promotes the graphitization; the carbon in the molten iron has relatively low saturated solubility in the cooling process, and the supersaturated carbon is separated out from the molten iron and attached to the surface of fine powder to form a carbon-coated shell layer; and (3) floating the graphite powder after realizing natural coating above the liquid level of molten iron, sucking out the graphite powder by negative pressure, discharging the graphite powder after cooling to 300 ℃, continuously cooling, and demagnetizing to obtain the molten iron inoculated artificial graphite cathode material.
Description
Technical Field
The invention belongs to the field of lithium ion secondary batteries, and particularly relates to an artificial graphite negative electrode material used in the lithium ion secondary batteries.
Background
The lithium ion secondary battery has high energy density and no memory effect, is widely applied to the fields of mobile phones, notebook computers, electric automobiles, energy storage and the like, is used as a power battery and an energy storage battery of the mobile energy of the electric automobiles or electric trucks at present, and has the market requirements of long service life, high energy density, good charge-discharge rate characteristic and low manufacturing cost.
The graphite cathode has high specific capacity, low reduction potential, good electrochemical reversibility, low volume expansion rate, high electronic conductivity and wide raw material sources, and is a mainstream cathode material of the current lithium ion secondary battery.
Commercial negative electrode materials mainly include artificial graphite and natural graphite. The natural graphite has the advantages of low cost and high compaction density, and has the main defects that the natural graphite powder has rough surface and large specific surface area, and a large amount of lithium sources are consumed in the reaction process of forming an SEI film on the surface of a negative electrode active material during the first charge and discharge, so that the first charge and discharge efficiency is low; the natural graphite has obvious polycrystal anisotropy, the volume expansion of the negative electrode material is not easy to offset each other during charging/discharging, the battery is easy to swell to cause large electrode group spacing fluctuation, the cycle life of the battery is shortened rapidly, and in addition, the anisotropy of the polycrystal also causes the insertion/extraction of lithium ions to be only carried out from certain end faces of the graphite powder polycrystal, so that the effective insertion/extraction area is small, and the charging/discharging rate characteristic of the battery is poor.
The mainstream of the industry at present is to use artificial graphite as a negative active material, such as artificial graphite which is completely graphitized at 2800-; the high-temperature graphitization temperature of the prior artificial graphite is up to 2800- 3 (ii) a Carbon resistance granules are filled between the graphite crucibles, 70-80% of heating heat is used for the process auxiliary materials and external heat insulation materials, in order to produce the uniformity of products, the heating and heat insulation time needs about 15 days, and the cooling time is about 10 daysThe processing period of the furnace is close to one month, the whole energy consumption is high, the effective energy utilization rate is low, the processing period is long, the capital occupation period is long, and the furnace becomes a bottleneck link of reducing the cost of the artificial graphite.
In order to reduce the cost of the artificial graphite, the mainstream improvement on the raw material is to adopt a core-shell structure coated product, for example, natural graphite powder or needle coke powder is coated and modified by adopting graphite precursors such as asphalt or furfural resin, and then high-temperature carbonization and high-temperature graphitization are carried out to prepare the artificial graphite, so that the coating process is complex, the product manufacturing period is long, and the overall energy consumption is still high; in addition, the interface strength between the coated shell and the core is limited, and the cathode pole piece is easy to crush when manufactured, so that the quality of the battery is fluctuated in the cycle life.
The invention is provided to overcome the above disadvantages and shortcomings of the prior artificial graphite cathode material manufacturing method.
Disclosure of Invention
The invention provides an economical, environment-friendly, high-energy utilization efficiency, high production speed and good product consistency molten iron inoculated artificial graphite cathode material and a manufacturing method, and is characterized in that the molten iron inoculated artificial graphite cathode material utilizes the high saturated solubility of molten iron to carbon in a high-temperature range of 1750 plus 2000 ℃ (TH) to realize the surface corrosion and sphericization of molten iron to graphite precursor fine powder, and utilizes the electromagnetic induction stirring function to enable the molten iron to form surface friction to the graphite precursor fine powder, and correspondingly forms shear stress in the graphite precursor fine powder, thereby accelerating the stress induction recrystallization in the graphite precursor fine powder and promoting graphitization; the molten iron is cooled to 1250-; in The (TL) temperature range, the graphite powder body after realizing natural coating floats to the liquid level of the molten iron, and is pumped out by utilizing negative pressure when the graphite powder body is at high temperature, and is continuously protected by inert gasCooling to 300 ℃ under the condition of vacuum or discharging, demagnetizing to obtain the molten iron inoculated artificial graphite cathode material, wherein the XRD test d002 is less than 0.3390 nanometers, and the true density is between 2.17 and 2.27g/cm 3 The gram capacity is more than 350mAh/g, the first charge-discharge efficiency is more than 92 percent, and the particle sphericity is more than 0.70.
The manufacturing method of the molten iron inoculated artificial graphite cathode material mainly comprises the following main steps: step1, preparing graphite precursor fine Powder (PG), wherein the graphite precursor raw material comprises one or more of metallurgical coke, anthracite, needle coke, shot coke, natural graphite, asphalt powder, hard carbon and other carbon materials, purifying the graphite precursor raw material by acid washing and/or alkali washing, neutralizing and drying, and optionally carrying out high-temperature calcination or carbonization treatment, so that the volatilization weight loss after 850 ℃/2 hours treatment under the protection of inert gas is less than 0.5%, crushing and grading are carried out, the granularity is controlled to be 5-20 micrometers, the D90 is less than 30 micrometers, and the ash content is less than 0.5%; step2, preparing high-temperature molten iron by vacuum induction melting, filling inert protective gas such as nitrogen or argon into a vacuum chamber under vacuum condition or after vacuum pumping, heating the molten iron to above 1350 ℃ by induction, blowing and conveying graphite precursor fine Powder (PG) into the molten iron by the protective gas such as nitrogen or argon, continuously heating the molten iron together to a high-temperature interval of 1750-, and Step3, continuously blowing the next batch of graphite precursor fine Powder (PG) into the high-temperature molten iron, and repeatedly manufacturing the artificial graphite cathode material inoculated by the molten iron.
In order to prolong the service life of a graphite crucible and/or a graphite/ceramic composite material crucible and/or a graphite piston pressure head and prevent the molten iron from excessively corroding at high temperature, the initial carbon content in the raw material iron is preferably more than 3 percent, more preferably more than 4 percent when the high-temperature molten iron is prepared by vacuum induction melting, the molten iron is heated to more than 1550 ℃ by induction melting under the vacuum condition, then graphite precursor fine Powder (PG) is blown and conveyed into the molten iron by adopting nitrogen or argon, the molten iron is continuously and simultaneously inductively heated to a high-temperature interval of 1800 plus 1950 ℃, intermittent electromagnetic stirring high-temperature inoculation is carried out for 60-90 minutes in the high-temperature interval, then the mixture of the molten iron and the graphite powder is cooled to a temperature interval of 1350 plus 1450 ℃, and the graphite powder floats to the liquid level of the molten iron, and transferring the high-temperature graphite powder into a material buffer container by adopting negative pressure adsorption, continuously slowly cooling to below 300 ℃ under a vacuum condition, removing magnetism after discharging to obtain a molten iron inoculated artificial graphite cathode material, continuously blowing next batch of graphite precursor fine Powder (PG) into the high-temperature molten iron, and repeatedly manufacturing the molten iron inoculated artificial graphite cathode material.
In order to balance the graphitization speed and the graphitization degree, reduce the radiation loss at high temperature and ensure the service life of the crucible, the highest temperature of the molten iron inoculation of the invention is preferably controlled to be 1800-1950 ℃; compared with the traditional method for manufacturing the artificial graphite with asphalt coating/medium-temperature carbonization/high-temperature graphitization, the novel coated artificial graphite cathode material naturally grown by the method has high coating uniformity among core shells and high interface strength, and in the compaction process for preparing the cathode plate, the prepared artificial graphite cathode material with the iron melt inoculation of the invention is not easy to be crushed, has high gram capacity of the prepared battery, high first charge and discharge efficiency and good multiplying power characteristic, the cycle life is long.
According to the invention, molten iron at high temperature is used for carrying out surface erosion on the graphite precursor fine powder, so that the active end group and the specific surface area of the graphite precursor fine powder are reduced, the lithium consumption of an SEI film formed by an artificial graphite cathode material is reduced, and the irreversible capacity is reduced.
The invention utilizes the highest temperature range of 1750-; the method adopts an electromagnetic induction heating mode under a vacuum condition, the heat energy utilization efficiency is far higher than the heat efficiency of the traditional high-temperature graphitization furnace, the heating time of graphitization is greatly reduced, the total energy consumption is reduced, and the novel core-shell structure artificial graphite cathode material with high graphitization degree and good isotropy can be obtained.
The invention utilizes the density difference to simply and easily realize the effective separation of the artificial graphite powder and the molten iron, does not need to adopt the subsequent procedures of chemical corrosion and the like to treat the iron, and the high-temperature molten iron only serves as a process medium, thereby basically not having material loss, and having the advantages of environment-friendly process, energy conservation, low production cost and strong market competitiveness.
Detailed Description
The following examples are carried out on the premise of the technical scheme and spirit of the present invention, and detailed embodiments and specific processes are given, but the protection scope of the present invention is not limited, and any technical scheme obtained by replacing or equivalent transformation, such as appropriate adjustment of carbon content in the iron raw material, or the iron raw material containing a certain amount of alloy elements such as Si, Ce, Mg, Mn, etc., should be understood as falling within the protection scope of the present invention.
Example 1 molten iron inoculated artificial graphite cathode material, XRD test d002 is 0.3360 nanometer, true density is between 2.21-2.25g/cm 3 Gram capacity is more than 360mAh/g, first charge-discharge efficiency is more than 94%, and particle sphericity is more than0.85。
The manufacturing method of the molten iron inoculated artificial graphite cathode material comprises the following main steps: step1, preparing graphite precursor fine Powder (PG), wherein the graphite precursor raw material adopts calcined needle coke, and is crushed and graded, the granularity is controlled to be 9-16 micrometers in average particle size D50, D90 is smaller than 25 micrometers, and ash content is smaller than 0.1%; step2, preparing high-temperature molten iron by vacuum induction smelting, heating the molten iron with the initial carbon content of more than 4.5 percent to 1550-, the above-described production of the molten iron inoculated artificial graphite negative electrode material was repeated.
Claims (3)
1. The molten iron inoculated artificial graphite cathode material is characterized in that the molten iron inoculated artificial graphite cathode material has higher saturation solubility to carbon in a 1750 plus 2000 ℃ (TH) high-temperature range, so that the molten iron can melt and spheroidize the surface of graphite precursor fine powder, and the molten iron can form surface friction to the graphite precursor fine powder by utilizing the electromagnetic induction stirring function, and correspondingly, shear stress is formed in the graphite precursor fine powder, so that the stress induction recrystallization in the graphite precursor fine powder is accelerated, and the graphitization is promoted; the relatively low-temperature molten iron has relatively low saturation solubility to carbon in the cooling process of the molten iron from The (TH) high-temperature interval to the 1250-A shell layer; in a temperature range (TL), the graphite powder which realizes natural coating floats above the liquid level of molten iron, the graphite powder is pumped out by negative pressure, the graphite powder is cooled to 300 ℃ under the protection of inert gas or under the vacuum condition and then is discharged from a furnace, the molten iron inoculated artificial graphite cathode material is obtained after demagnetization, XRD test d002 is less than 0.3390 nanometers, and the true density is between 2.17 and 2.27g/cm 3 The gram capacity is more than 350mAh/g, the first charge-discharge efficiency is more than 92 percent, and the particle sphericity is more than 0.70.
2. The molten iron inoculated artificial graphite negative electrode material and the manufacturing method thereof as claimed in claim 1, wherein the manufacturing method of the molten iron inoculated artificial graphite negative electrode material mainly comprises the following main steps: step1, preparing graphite precursor fine Powder (PG), wherein the graphite precursor raw material comprises one or more of metallurgical coke, anthracite, needle coke, shot coke, natural graphite, asphalt powder, hard carbon and other carbon materials, purifying the graphite precursor raw material by acid washing and/or alkali washing, neutralizing and drying, and optionally carrying out high-temperature calcination or carbonization treatment, so that the volatilization weight loss after 850 ℃/2 hours treatment under the protection of inert gas is less than 0.5%, crushing and grading are carried out, the granularity is controlled to be 5-20 micrometers, the D90 is less than 30 micrometers, and the ash content is less than 0.5%; step2, preparing high-temperature molten iron by vacuum induction melting, filling inert gases such as nitrogen or argon into a vacuum chamber for protection under the vacuum condition or after vacuum pumping, heating the molten iron to above 1350 ℃ by induction, blowing and conveying graphite precursor fine Powder (PG) into the molten iron by the inert gases such as nitrogen or argon, continuously heating the molten iron to a high-temperature interval of 1750-, and demagnetizing to obtain the molten iron inoculated artificial graphite cathode material, and Step3, continuously blowing the next batch of graphite precursor fine Powder (PG) into the high-temperature molten iron, and repeatedly manufacturing the molten iron inoculated artificial graphite cathode material.
3. The molten iron inoculated artificial graphite cathode material and the manufacturing method thereof as claimed in claim 1, wherein the initial carbon content is more than 4% when the high temperature molten iron is prepared by vacuum induction melting, the molten iron is heated to more than 1550 ℃ by induction melting, then the graphite precursor fine Powder (PG) is blown into the molten iron by nitrogen, the molten iron is continuously and inductively heated to a high temperature range of 1800-, the above-described production of the molten iron inoculated artificial graphite negative electrode material was repeated.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210708922.2A CN115028164B (en) | 2022-05-22 | 2022-05-22 | Iron water inoculated artificial graphite negative electrode material and manufacturing method thereof |
| PCT/CN2023/095543 WO2023226934A1 (en) | 2022-05-22 | 2023-05-22 | Molten-iron-inoculated artificial graphite negative electrode material and manufacturing method therefor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210708922.2A CN115028164B (en) | 2022-05-22 | 2022-05-22 | Iron water inoculated artificial graphite negative electrode material and manufacturing method thereof |
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| CN115028164A true CN115028164A (en) | 2022-09-09 |
| CN115028164B CN115028164B (en) | 2024-02-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023226934A1 (en) * | 2022-05-22 | 2023-11-30 | 深圳市钢昱碳晶科技有限公司 | Molten-iron-inoculated artificial graphite negative electrode material and manufacturing method therefor |
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| TWI516442B (en) * | 2012-12-10 | 2016-01-11 | 國立清華大學 | Spheroidal graphite low-temperature manufacturing method and system |
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| CN115028164B (en) * | 2022-05-22 | 2024-02-23 | 深圳市钢昱碳晶科技有限公司 | Iron water inoculated artificial graphite negative electrode material and manufacturing method thereof |
| CN115124028B (en) * | 2022-05-29 | 2023-10-31 | 深圳市钢昱碳晶科技有限公司 | Artificial graphite negative electrode material inoculated with high-low temperature molten iron and manufacturing device thereof |
| CN115676815A (en) * | 2022-07-21 | 2023-02-03 | 李鑫 | Manufacturing device and method for molten iron inoculated artificial graphite cathode material |
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- 2022-05-22 CN CN202210708922.2A patent/CN115028164B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023226934A1 (en) * | 2022-05-22 | 2023-11-30 | 深圳市钢昱碳晶科技有限公司 | Molten-iron-inoculated artificial graphite negative electrode material and manufacturing method therefor |
Also Published As
| Publication number | Publication date |
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| WO2023226934A1 (en) | 2023-11-30 |
| CN115028164B (en) | 2024-02-23 |
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