CN114653302A - Granulation method of artificial graphite, granulated material, artificial graphite, preparation method and application of artificial graphite, and secondary battery - Google Patents
Granulation method of artificial graphite, granulated material, artificial graphite, preparation method and application of artificial graphite, and secondary battery Download PDFInfo
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- CN114653302A CN114653302A CN202210254655.6A CN202210254655A CN114653302A CN 114653302 A CN114653302 A CN 114653302A CN 202210254655 A CN202210254655 A CN 202210254655A CN 114653302 A CN114653302 A CN 114653302A
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- 229910021383 artificial graphite Inorganic materials 0.000 title claims abstract description 76
- 238000005469 granulation Methods 0.000 title claims abstract description 37
- 230000003179 granulation Effects 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000008187 granular material Substances 0.000 title claims abstract description 10
- 239000011230 binding agent Substances 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 238000010000 carbonizing Methods 0.000 claims abstract description 3
- 238000003763 carbonization Methods 0.000 claims description 14
- 238000005087 graphitization Methods 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 10
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical group [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 7
- 229910001416 lithium ion Inorganic materials 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 239000011261 inert gas Substances 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 239000010426 asphalt Substances 0.000 claims description 4
- 239000011331 needle coke Substances 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 239000001307 helium Substances 0.000 claims description 3
- 229910052734 helium Inorganic materials 0.000 claims description 3
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 3
- 239000002006 petroleum coke Substances 0.000 claims description 3
- 239000011334 petroleum pitch coke Substances 0.000 claims description 2
- 230000000630 rising effect Effects 0.000 claims description 2
- 239000007858 starting material Substances 0.000 claims description 2
- 238000005453 pelletization Methods 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 8
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 238000009776 industrial production Methods 0.000 abstract description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 1
- 229910002804 graphite Inorganic materials 0.000 abstract 1
- 239000010439 graphite Substances 0.000 abstract 1
- 239000007770 graphite material Substances 0.000 description 4
- 238000001878 scanning electron micrograph Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000011267 electrode slurry Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/12—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic in rotating drums
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/28—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic using special binding agents
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B55/00—Coking mineral oils, bitumen, tar, and the like or mixtures thereof with solid carbonaceous material
- C10B55/02—Coking mineral oils, bitumen, tar, and the like or mixtures thereof with solid carbonaceous material with solid materials
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
- C10B57/045—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition containing mineral oils, bitumen, tar or the like or mixtures thereof
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- 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
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- 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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Electrochemistry (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Battery Electrode And Active Subsutance (AREA)
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Abstract
The invention discloses a granulation method of artificial graphite, a granulation material, the artificial graphite, a preparation method and application thereof, and a secondary battery. The granulation method of the artificial graphite comprises the following steps: in a roller furnace, the mixture containing the binder and the crushed and spheroidized artificial graphite raw material is granulated at the temperature of 300-400 ℃ to obtain the artificial graphite granules. The preparation method of the artificial graphite comprises the following steps: and carbonizing the artificial graphite granulating material, and then graphitizing to obtain the graphite. The granulation method provided by the invention realizes low energy consumption and low equipment loss, and also can realize the excellent effect of remarkably improving the granulation capacity of the roller furnace by about 30%. In addition, the artificial graphite prepared by the preparation method disclosed by the invention has excellent electrochemical performance, can be widely applied to the 3C field, improves the productivity of large-scale industrial production, greatly reduces the production cost and realizes higher economic benefit.
Description
Technical Field
The invention relates to the field of lithium ion batteries, in particular to a granulation method of artificial graphite, a granulation material, the artificial graphite, a preparation method and application of the artificial graphite, and a secondary battery.
Background
The artificial graphite has the remarkable advantages of excellent cycle performance, high-rate charge-discharge efficiency, electrolyte compatibility and the like, and is widely applied to the fields of vehicle power batteries and medium-high-end electronic products. In recent years, with the increasing demand of the fields of vehicle power batteries and medium-high-end electronic products for endurance and the rapid development of the lithium battery industry, the demand of high-capacity artificial graphite cathode materials is increased rapidly, and the process research aiming at the increase of the capacity of the artificial graphite materials becomes a hotspot.
The granulation process is one of the key process steps for manufacturing the artificial graphite, and the productivity of the granulation process is one of the important factors for limiting the total production capacity of the artificial graphite. In the existing granulating process adopting a roller furnace, granulation is generally carried out at the temperature of more than 500 ℃, and the granulation time is generally more than 8 hours. The process has the advantages of higher granulation temperature, higher energy consumption, higher equipment loss and lower productivity. The physical and chemical properties of the graphite material can be influenced by randomly reducing the granulation temperature.
Therefore, the development of a preparation process of an artificial graphite material with lower energy consumption, less equipment loss, higher productivity and excellent electrochemical performance is urgently needed.
Disclosure of Invention
The invention aims to solve the technical problems of high energy consumption, high equipment loss and low capacity of the conventional preparation method of the artificial graphite by adopting roller furnace granulation, and provides the granulation method of the artificial graphite, the granulated material, the artificial graphite, the preparation method and application of the artificial graphite and a secondary battery. The method has the advantages of low energy consumption, low equipment loss, obviously improved productivity of the preferred scheme compared with the prior art, and capability of ensuring excellent electrochemical performance of the prepared artificial graphite.
According to the invention, through matching the specific low-temperature granulation process with the subsequent carbonization coating process, the low energy consumption, the low equipment loss and the obvious improvement of the productivity can be realized, and the excellent electrical property of the artificial graphite material can also be realized.
The invention solves the technical problems through the following technical scheme.
The invention provides a granulation method of artificial graphite, which comprises the following steps: in a roller furnace, the mixture containing the binder and the crushed and spheroidized artificial graphite raw material is granulated at the temperature of 300-400 ℃ to obtain the artificial graphite granules.
Wherein, the artificial graphite raw material can be raw materials which are conventionally used for preparing artificial graphite in the field, such as petroleum coke or pitch coke. The petroleum coke is preferably calcined needle coke.
Wherein, the equipment for crushing and spheroidizing, the operation mode and the conditions can be carried out according to the routine method in the field. The median particle diameter D of the crushed and spheroidized artificial graphite raw material50Preferably 7-9 μm.
Wherein the binder can be a binder conventional in the art, preferably asphalt. The softening point of the pitch is preferably 150 ℃ to 250 ℃.
Wherein the mixture can be prepared by adopting equipment, operation modes and conditions which are conventional in the field. The mass ratio of the crushed and spheroidized artificial graphite raw material to the binder is preferably 100 (15-20), such as 100: 16. The mixture is preferably prepared by mixing the binder and the pulverized and spheroidized artificial graphite raw material by using a mixer. The mixing time can be 90-120min, preferably 100 min.
Wherein the temperature of the granulation is 300-400 ℃, such as 300 ℃, 350 ℃ or 400 ℃. Under this condition, the raw material particles are bonded to each other to form an initial particle structure. The temperature is lower than the existing granulation temperature, and the energy consumption and equipment loss are reduced.
Wherein, the granulation time is preferably 4 to 6 hours, and more preferably 5 hours. The method can realize shorter granulation time than the prior art, and when the granulation time of 4-6h is adopted, the single-day capacity can be obviously improved by more than 30 percent compared with the prior art.
Wherein the other operating conditions of the roller oven, in addition to the temperature profile, may be conventional in the art. The rotating speed of the roller furnace can be 7-8 r/min. Granulation is generally carried out under an inert atmosphere as is conventional in the art. The inert gas may be one or more of nitrogen, helium, and argon.
The invention also provides the artificial graphite granulation material prepared by the granulation method.
The invention also provides a preparation method of the artificial graphite, which comprises the following steps: carbonizing the artificial graphite granules, and then graphitizing to obtain the artificial graphite granules.
And the carbonization ensures that the artificial graphite granulating material can melt and impregnate the residual binder into the formed initial particle gaps while removing excessive volatile components, so as to realize uniform coating, thereby ensuring that the particle structure is more compact. The equipment, treatment and conditions for such carbonization may be conventional in the art. The carbonization equipment is preferably a pushed slab kiln or a roller kiln. The temperature of the carbonization is preferably 1150-1250 ℃. Preferably, the temperature can be increased to the carbonization temperature at the temperature rising speed of 2-3 ℃/min. The carbonization time is preferably 20-24h, for example 23h, as described. The carbonization is generally carried out under an inert atmosphere as is conventional in the art. The inert gas is as described above.
Wherein the equipment, treatment and conditions for said graphitization may be as conventional in the art. The graphitization apparatus is preferably an acheson type graphitization furnace. The temperature for the graphitization may be 2600-. The graphitization time may be 70-90h, such as 72 h. Graphitization is generally carried out under an inert atmosphere as is conventional in the art. The inert gas is as described above. The median particle diameter D of the artificial graphite obtained by graphitization50Can be 15-20 μm.
The invention also provides the artificial graphite prepared by the preparation method.
The invention also provides the application of the artificial graphite in preparing secondary battery electrodes.
The present invention also provides a secondary battery comprising an electrode made of the artificial graphite as described above.
Wherein the secondary battery may be a lithium ion battery. The electrode may be a lithium ion battery negative electrode.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The reagents and starting materials used in the present invention are commercially available.
The positive progress effects of the invention are as follows: the method of the invention realizes low energy consumption and low equipment loss, and can also realize the excellent effect of remarkably improving the granulation capacity of the roller furnace by more than 30 percent. In addition, the artificial graphite prepared by the method also has excellent electrochemical performance. The method can be widely applied to the field of 3C, the capacity of large-scale industrial production is improved, the production cost is greatly reduced, and higher economic benefit is realized.
Drawings
FIG. 1 is a scanning electron micrograph of the artificial graphite of example 2 magnified 500 times.
FIG. 2 is a scanning electron micrograph of the artificial graphite of example 2 magnified 1000 times.
FIG. 3 is a scanning electron micrograph of the artificial graphite of example 2 magnified 3000 times.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the invention thereto. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.
Example 1
(1) And granulating
In a crushing device, the calcined needle coke is crushed and spheroidized to obtain powder with median particle diameter D50The thickness was controlled to 8 μm. Mixing the prepared powder with asphalt (binder) at a ratio of 100:16, and mixing for 100min to uniformly mix the needle coke with the asphalt. And then placing the mixed material in a roller furnace, and granulating under the protection of nitrogen, wherein the granulation temperature is 300 ℃, the granulation time is 5 hours, and the rotating speed of the roller furnace is 8r/min to obtain the artificial graphite granules.
(2) And charring the mixture
Placing the obtained artificial graphite granules in a roller kiln, heating to 1250 ℃ at a heating rate of 2.28 ℃/min under the protection of nitrogen, and preserving heat for 23h for carbonization treatment.
(3) Graphitization of the resultant
And graphitizing the carbonized discharge material in an Acheson furnace at 3000 ℃ for 72h to obtain the artificial graphite.
Example 2
The procedure of example 1 was followed, except that the granulation temperature was 350 ℃.
FIGS. 1 to 3 are scanning electron micrographs of the resulting artificial graphite sequentially magnified 500 times, 1000 times and 3000 times. As can be seen from the figure, the artificial graphite particles prepared by the process form compact layered bonding morphology, and realize the similar morphology structure of the original process.
Example 3
The procedure of example 1 was followed, except that the granulation temperature was 400 ℃.
Effects of the embodiment
The electrode preparation method and test method were as follows:
(1) and mixing and stirring distilled water and carboxymethyl cellulose to obtain a glue solution, adding conductive carbon black, stirring until the conductive carbon black is uniformly dispersed, adding the artificial graphite prepared in the embodiment 1-3, adding proper styrene-butadiene latex, and stirring uniformly to obtain the negative electrode slurry.
(2) After the slurry is uniformly coated on the copper foil, the copper foil is dried in a vacuum drying oven for 4 hours at the temperature of 95 ℃.
(3) And rolling and cutting the dried pole piece into pieces to obtain the negative pole piece. In the glove box, the lithium sheet is used as a counter electrode to make electricity.
(4) The prepared battery is subjected to charge and discharge tests in a battery test cabinet, under the condition of normal temperature, the battery is subjected to constant current discharge to 5mV with the current of 0.6mA, stands for 10min, then is subjected to constant current discharge to 5mV with the current of 0.3mA, stands for 10min, then is subjected to constant current charge to 2.0V with the current of 0.6mA, and the discharge capacity and the charge capacity in the process are recorded. The first discharge gram capacity and the first discharge efficiency are calculated.
The physicochemical property test results are shown in table 1.
TABLE 1 physicochemical Properties of the artificial graphites of examples 1-3
As can be seen from the above table, the artificial graphite prepared in examples 1 to 3 has a median particle diameter of 15 to 22 μm and a specific surface area of less than 2m2(ii)/g, tap density greater than 0.85g/cm3The first discharge gram capacity is larger than 355mAh/g, the first discharge efficiency is larger than 92%, and the compaction density is larger than 1.75 g/cc. From this, it is understood that the artificial graphite of the present invention has excellent quality properties.
Claims (10)
1. A granulation method of artificial graphite is characterized by comprising the following steps:
in a roller furnace, the mixture containing the binder and the crushed and spheroidized artificial graphite raw material is granulated at the temperature of 300-400 ℃ to obtain the artificial graphite granules.
2. The process for pelletizing artificial graphite according to claim 1, characterized in that the artificial graphite raw material is petroleum coke or pitch coke, preferably calcined needle coke;
and/or the pulverized spheroidized artificial graphite particlesMedian particle diameter D of the material50Is 7-9 μm;
and/or, the binder is asphalt; the softening point of the pitch is preferably 150 ℃ to 250 ℃.
3. The method for granulating artificial graphite as claimed in claim 1, wherein the mass ratio of said pulverized and spheroidized artificial graphite starting material to said binder is 100 (15-20), such as 100: 16.
4. The method for granulating artificial graphite as claimed in claim 1, wherein said mixture is prepared by mixing said binder with said pulverized and spheroidized artificial graphite raw material using a mixer; the mixing time can be 90-120min, preferably 100 min.
5. The method for granulating artificial graphite as claimed in claim 1, wherein the granulation temperature is 300 ℃, 350 ℃ or 400 ℃;
and/or the granulation time is 4-6h, preferably 5 h;
and/or the rotating speed of the roller furnace is 7-8 r/min;
and/or, granulating under an inert atmosphere, wherein the inert gas is one or more of nitrogen, helium and argon.
6. An artificial graphite granulation material produced by the granulation process of any one of claims 1-5.
7. The preparation method of the artificial graphite is characterized by comprising the following steps: carbonizing the artificial graphite aggregate of claim 6, and graphitizing the carbonized artificial graphite aggregate;
the carbonization equipment is preferably a pushed slab kiln or a roller kiln;
the temperature of the carbonization is preferably 1150-1250 ℃;
preferably, the temperature is increased to the carbonization temperature at the temperature rising speed of 2-3 ℃/min;
the carbonization time is preferably 20-24h, such as 23 h;
preferably, the carbonization and graphitization are carried out under an inert atmosphere, wherein the inert gas is one or more of nitrogen, helium and argon;
the graphitizing apparatus is preferably an acheson type graphitizing furnace;
the graphitization temperature is preferably 2600-;
the graphitization time is preferably 70-90h, such as 72 h.
8. The artificial graphite produced by the production method according to claim 7.
9. Use of the artificial graphite according to claim 8 for the preparation of a secondary battery electrode; the secondary battery is a lithium ion battery; the electrode is a lithium ion battery cathode.
10. A secondary battery comprising an electrode made of the artificial graphite according to claim 8; the secondary battery is a lithium ion battery; the electrode is a negative electrode of the lithium ion battery.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116161654A (en) * | 2022-12-23 | 2023-05-26 | 合肥国轩新材料科技有限公司 | Efficient preparation method of artificial graphite |
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