CN110707289A - Preparation method of high-rate artificial graphite negative electrode material - Google Patents
Preparation method of high-rate artificial graphite negative electrode material Download PDFInfo
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- CN110707289A CN110707289A CN201910941195.2A CN201910941195A CN110707289A CN 110707289 A CN110707289 A CN 110707289A CN 201910941195 A CN201910941195 A CN 201910941195A CN 110707289 A CN110707289 A CN 110707289A
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
- B02C4/08—Crushing or disintegrating by roller mills with two or more rollers with co-operating corrugated or toothed crushing-rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/28—Details
- B02C4/286—Feeding devices
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a preparation method of a high-rate artificial graphite cathode material, which comprises the following steps: selecting and crushing materials; step two, mixing the ingredients; step three, granulating; step four, graphitizing; fifthly, demagnetizing and screening; in the first step, petroleum coke, needle coke and asphalt are selected as required, then the selected materials are respectively added into a crusher, the materials are crushed into particles with the particle size D50 of 1-7 mu m by the operation of the crusher, and fillers, dispersion media and specific surfactants are selected as required; the preparation method improves the prior art, strictly screens materials, performs crushing and grinding twice to reduce the particle size, performs mixing granulation twice, mixes, coats, granulates, graphitizes and demagnetizes the graphite precursor and the binder, thereby obtaining the graphite material, which has better comprehensive quality, has the characteristics of high multiplying power and excellent performance, and improves the quality of the later-stage graphite cathode material.
Description
Technical Field
The invention relates to the technical field of graphite cathode materials, in particular to a preparation method of a high-rate artificial graphite cathode material.
Background
In the current commercialized lithium ion battery cathode material, the lithium ion battery taking the artificial graphite as the cathode material occupies the main market, and along with the increase and development of mobile electric equipment in domestic and foreign markets, the high requirement is provided for the charge and discharge, namely the high rate performance of the cathode material again; in the preparation processes of some processes, the mixing and coating effects are poor, the mixing is difficult to realize, the product quality stability is poor, the particle size is high, the quality of a finished product at the later stage is influenced, and the operation cost is high, so that the preparation method of the high-rate artificial graphite cathode material is significant.
Disclosure of Invention
The invention aims to provide a preparation method of a high-rate artificial graphite negative electrode material, which aims to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme: a preparation method of a high-rate artificial graphite negative electrode material comprises the following steps: selecting and crushing materials; step two, mixing the ingredients; step three, granulating; step four, graphitizing; fifthly, demagnetizing and screening;
in the first step, petroleum coke, needle coke and asphalt are selected as required, then the selected materials are respectively added into a crusher, the materials are crushed into particles with the particle size D50 of 1-7 mu m by the operation of the crusher, and fillers, dispersion media and specific surfactants are selected as required;
in the second step, the coke tailings selected in the first step are used as aggregates, and the asphalt tailings are binders, wherein the mass ratio of the aggregates to the binders to the fillers is 100: 0.1-0.8; the mass ratio of the binder to the dispersion medium is 1: 2-1: 4; the mass ratio of the adhesive to the specific surfactant is 100: 0.1-0.5, the aggregate, the binder, the filler, the dispersion medium and the specific surfactant are weighed in proportion and added into a novel grinding mixer, and all materials are fully mixed through the mixer to obtain a mixed material;
in the third step, the mixed material prepared in the second step is added into a hot coating reaction kettle for reaction processing, and then granulation is carried out in an inert atmosphere, and screening is carried out to obtain a granulated substance;
in the fourth step, under the protection of inert gas, carrying out carbonization heat treatment on the granulated substance obtained in the third step at 800-1000 ℃ for 10-50 hours, and then carrying out high-temperature graphitization on the carbonized granulated substance at 2800-3200 ℃ to obtain a graphitized mixed material;
and in the fifth step, the graphitized mixed material obtained in the fourth step is added into a demagnetizing screening machine for screening and demagnetizing to obtain the high-magnification artificial graphite.
According to the technical scheme, the filler in the first step is one or more of carbon nano tubes, graphene, carbon black or acetylene black.
According to the technical scheme, the dispersion medium in the first step is one or more of petroleum tar, coal tar, heavy oil, acetone, diethyl ether or ethanol.
According to the technical scheme, the specific surfactant in the first step is one or more of oleic acid and polyethylene glycol (PEG).
According to the technical scheme, a 100-mesh 500-mesh vibrating screen is adopted for screening in the fifth step, the specific surface area of a finished product obtained after magnetic removal and screening is less than 3.0 square meters per gram, D50 is 10-25 mu m, and the content of Fe is less than 100 ppm.
According to the technical scheme, the novel grinding mixer used in the second step comprises a mixing box, a first grinding roller, a second grinding roller, a rotating shaft, a gear, a motor, a feeding funnel, an induced draft fan, a material conveying pipe and a sieve plate, wherein the first grinding roller and the second grinding roller are symmetrically arranged inside two sides of the top end of the mixing box, the rotating shaft is welded and fixed at two ends of the first grinding roller and the second grinding roller, one end of the rotating shaft penetrates through the outer parts of two sides of the mixing box, the gear is symmetrically and fixedly welded at one end of the first grinding roller and one end of the second grinding roller which penetrate through the outer part of the mixing box, the motor is fixed on the outer wall of one side of the mixing box through bolts, the other end of the second grinding roller penetrates through the outer part of the mixing box and is fixedly connected with one end of an output shaft of the motor, the sieve plate is welded and fixed on the outer walls of two sides of, the utility model discloses a quick-witted material mixing box, including sieve, mixing box, fan, mixing box, first grinding roller and second grinding roller, the mixing box is located and inlays on one side inner wall of sieve top and installs the draught fan, the defeated material end of draught fan runs through the outside fixedly connected with conveying pipeline in mixing box, the mixing box is located and has link up on the outer wall of first grinding roller and second grinding roller top and install feed hopper, the one end of conveying pipeline runs through in one side inner wall of feed hopper.
According to the technical scheme, the material collecting plate is welded and fixed on the outer wall of the bottom end of the mixing box below the sieve plate, and the discharging pipe is connected to the outer wall of the bottom end of the mixing box on one side above the material collecting plate in a through mode.
According to the technical scheme, a bearing is arranged at the joint of the rotating shaft and the inner wall of one side of the mixing box.
Compared with the prior art, the invention has the following beneficial effects: this preparation method of graphite negative pole material improves current technology perfectly, carry out strict screening to the material, carry out twice broken reduction particle size of milling, the granulation is mixed to the secondary, mix graphite precursor and binder, the cladding, the granulation, graphitization, demagnetize, thereby obtain graphite material, comprehensive quality is better, have the multiplying power height, the characteristics of excellent performance, and the course of working is comparatively convenient, and the processability is good, can satisfy later stage battery and use each side index requirement, wherein select for use novel blendor in the compounding process, when even compounding, the up to standard and even of compounding particle size has been guaranteed, the quality of later stage graphite negative pole material has been improved.
Drawings
FIG. 1 is a flow chart of the production process of the present invention;
FIG. 2 is a schematic view of the novel grinding and mixing machine of the present invention in a top view;
FIG. 3 is a front view of the novel grinding mixer of the present invention;
in the figure: 1. a mixing box; 2. a first grinding roller; 3. a second grinding roller; 4. a rotating shaft; 5. a gear; 6. a motor; 7. a feed hopper; 8. an induced draft fan; 9. a delivery pipe; 10. a sieve plate; 11. a material collecting plate; 12. a discharge pipe; 13. and a bearing.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, the present invention provides a technical solution: a preparation method of a high-rate artificial graphite negative electrode material comprises the following steps:
example 1:
a preparation method of a high-rate artificial graphite negative electrode material comprises the following steps: selecting and crushing materials; step two, mixing the ingredients; step three, granulating; step four, graphitizing; fifthly, demagnetizing and screening;
in the first step, petroleum coke, needle coke and asphalt are selected as required, then the selected materials are respectively added into a crusher, the materials are crushed into particles with the particle size D50 of 1-7 mu m by the operation of the crusher, and filler carbon black, dispersion medium coal tar and specific surfactant oleic acid are selected as required;
in the second step, the coke tailings selected in the first step are used as aggregates, and the asphalt tailings are binders, wherein the mass ratio of the aggregates to the binders to the fillers is 100:0.2: 0.2; the mass ratio of the binder to the dispersion medium is 1: 2; the mass ratio of the adhesive to the specific surfactant is 100:0.2, the aggregate, the adhesive, the filler, the dispersion medium and the specific surfactant are weighed in proportion and added into a novel grinding mixer, and all materials are fully mixed through the mixer to obtain a mixed material;
in the third step, the mixed material prepared in the second step is added into a hot coating reaction kettle for reaction processing, and then granulation is carried out in an inert atmosphere, and screening is carried out to obtain a granulated substance;
in the fourth step, firstly, the granulated substance obtained in the third step is carbonized and heat treated for 25 hours at 900 ℃ under the protection of inert gas, and then the carbonized granulated substance is graphitized at 3000 ℃ to obtain a graphitized mixed material;
and in the fifth step, the graphitized mixed material obtained in the fourth step is added into a demagnetizing screening machine for screening and demagnetizing to obtain the high-magnification artificial graphite.
Wherein, the filling material in the first step is one or more of carbon nano tube, graphene, carbon black or acetylene black.
Wherein, the dispersion medium in the step one is one or more of petroleum tar, coal tar, heavy oil, acetone, ether or ethanol.
Wherein, the specific surfactant in the step one is one or more of oleic acid and polyethylene glycol (PEG).
Wherein, the screening in the fifth step adopts a 100-mesh 500-mesh vibrating screen, the specific surface area of the finished product obtained after magnetic removal and screening is less than 3.0 square meters per gram, D50 is 10-25 mu m, and the content of Fe is less than 100 ppm.
Wherein, the novel grinding mixer used in the second step comprises a mixing box 1, a first grinding roller 2, a second grinding roller 3, a rotating shaft 4, a gear 5, a motor 6, a feeding funnel 7, an induced draft fan 8, a material conveying pipe 9 and a sieve plate 10, the first grinding roller 2 and the second grinding roller 3 are symmetrically arranged inside two sides of the top end of the mixing box 1, the rotating shaft 4 is welded and fixed at two ends of the first grinding roller 2 and the second grinding roller 3, one end of the rotating shaft 4 penetrates through the two sides of the mixing box 1, the gear 5 is symmetrically and fixedly welded at one end of the first grinding roller 2 and one end of the second grinding roller 3 penetrating through the outside of the mixing box 1, the motor 6 is fixed on the outer wall of one side of the mixing box 1 by bolts, the other end of the second grinding roller 3 penetrates through the outside of the mixing box 1 and is fixedly connected with one end of an output shaft of the motor 6, the sieve plate 10 is welded and fixed on the outer walls of two sides of the mixing, the mixer box 1 is located one side inner wall above the sieve plate 10 and is inlayed and installed the draught fan 8, and the conveying end of draught fan 8 holds and runs through in the outside fixedly connected with conveying pipeline 9 of mixer box 1, and mixer box 1 is located and has link up on the outer wall of first grinding roller 2 and second grinding roller 3 top and install feed hopper 7, and the one end of conveying pipeline 9 runs through in one side inner wall of feed hopper 7.
Wherein, welded fastening has the board 11 that gathers materials on the bottom outer wall that mixing box 1 is located sieve 10 below, and through connection has discharging pipe 12 on the top one side outer wall that mixing box 1 bottom is located the board 11 that gathers materials.
Wherein, the junction of the rotating shaft 4 and the inner wall of one side of the mixing box 1 is provided with a bearing 13.
Example 2:
a preparation method of a high-rate artificial graphite negative electrode material comprises the following steps: selecting and crushing materials; step two, mixing the ingredients; step three, granulating; step four, graphitizing; fifthly, demagnetizing and screening;
in the first step, petroleum coke, needle coke and asphalt are selected as required, then the selected materials are respectively added into a crusher, the materials are crushed into particles with the particle size D50 of 1-7 mu m by the operation of the crusher, and a filler carbon nano tube, dispersion medium heavy oil and a specific surfactant polyethylene glycol are selected as required;
in the second step, the coke tailings selected in the first step are used as aggregates, and the asphalt tailings are binders, wherein the mass ratio of the aggregates to the binders to the fillers is 100:0.3: 0.2; the mass ratio of the binder to the dispersion medium is 1: 3; the mass ratio of the adhesive to the specific surfactant is 100:0.3, the aggregate, the adhesive, the filler, the dispersion medium and the specific surfactant are weighed in proportion and added into a novel grinding mixer, and all materials are fully mixed through the mixer to obtain a mixed material;
in the third step, the mixed material prepared in the second step is added into a hot coating reaction kettle for reaction processing, and then granulation is carried out in an inert atmosphere, and screening is carried out to obtain a granulated substance;
in the fourth step, under the protection of inert gas, carrying out carbonization heat treatment on the granules obtained in the third step at 1000 ℃ for 30 hours, and then carrying out high-temperature graphitization on the carbonized granules at 2800 ℃ to obtain a graphitized mixed material;
and in the fifth step, the graphitized mixed material obtained in the fourth step is added into a demagnetizing screening machine for screening and demagnetizing to obtain the high-magnification artificial graphite.
Wherein, the filling material in the first step is one or more of carbon nano tube, graphene, carbon black or acetylene black.
Wherein, the dispersion medium in the step one is one or more of petroleum tar, coal tar, heavy oil, acetone, ether or ethanol.
Wherein, the specific surfactant in the step one is one or more of oleic acid and polyethylene glycol (PEG).
Wherein, the screening in the fifth step adopts a 100-mesh 500-mesh vibrating screen, the specific surface area of the finished product obtained after magnetic removal and screening is less than 3.0 square meters per gram, D50 is 10-25 mu m, and the content of Fe is less than 100 ppm.
Wherein, the novel grinding mixer used in the second step comprises a mixing box 1, a first grinding roller 2, a second grinding roller 3, a rotating shaft 4, a gear 5, a motor 6, a feeding funnel 7, an induced draft fan 8, a material conveying pipe 9 and a sieve plate 10, the first grinding roller 2 and the second grinding roller 3 are symmetrically arranged inside two sides of the top end of the mixing box 1, the rotating shaft 4 is welded and fixed at two ends of the first grinding roller 2 and the second grinding roller 3, one end of the rotating shaft 4 penetrates through the two sides of the mixing box 1, the gear 5 is symmetrically and fixedly welded at one end of the first grinding roller 2 and one end of the second grinding roller 3 penetrating through the outside of the mixing box 1, the motor 6 is fixed on the outer wall of one side of the mixing box 1 by bolts, the other end of the second grinding roller 3 penetrates through the outside of the mixing box 1 and is fixedly connected with one end of an output shaft of the motor 6, the sieve plate 10 is welded and fixed on the outer walls of two sides of the mixing, the mixer box 1 is located one side inner wall above the sieve plate 10 and is inlayed and installed the draught fan 8, and the conveying end of draught fan 8 holds and runs through in the outside fixedly connected with conveying pipeline 9 of mixer box 1, and mixer box 1 is located and has link up on the outer wall of first grinding roller 2 and second grinding roller 3 top and install feed hopper 7, and the one end of conveying pipeline 9 runs through in one side inner wall of feed hopper 7.
Wherein, welded fastening has the board 11 that gathers materials on the bottom outer wall that mixing box 1 is located sieve 10 below, and through connection has discharging pipe 12 on the top one side outer wall that mixing box 1 bottom is located the board 11 that gathers materials.
Wherein, the junction of the rotating shaft 4 and the inner wall of one side of the mixing box 1 is provided with a bearing 13.
Example 3:
a preparation method of a high-rate artificial graphite negative electrode material comprises the following steps: selecting and crushing materials; step two, mixing the ingredients; step three, granulating; step four, graphitizing; fifthly, demagnetizing and screening;
in the first step, petroleum coke, needle coke and asphalt are selected as required, then the selected materials are respectively added into a crusher, the materials are crushed into particles with the particle size D50 of 1-7 mu m by the operation of the crusher, and carbon black as a filling material, ether as a dispersion medium and oleic acid as a specific surfactant are selected as required;
in the second step, the coke tailings selected in the first step are used as aggregates, and the asphalt tailings are binders, wherein the mass ratio of the aggregates to the binders to the fillers is 100:0.4: 0.3; the mass ratio of the binder to the dispersion medium is 1: 4; the mass ratio of the adhesive to the specific surfactant is 100:0.5, the aggregate, the adhesive, the filler, the dispersion medium and the specific surfactant are weighed in proportion and added into a novel grinding mixer, and all materials are fully mixed through the mixer to obtain a mixed material;
in the third step, the mixed material prepared in the second step is added into a hot coating reaction kettle for reaction processing, and then granulation is carried out in an inert atmosphere, and screening is carried out to obtain a granulated substance;
in the fourth step, firstly, the granulated substance obtained in the third step is carbonized and heat treated for 20 hours at 900 ℃ under the protection of inert gas, and then the carbonized granulated substance is graphitized at 3200 ℃ to obtain a graphitized mixed material;
and in the fifth step, the graphitized mixed material obtained in the fourth step is added into a demagnetizing screening machine for screening and demagnetizing to obtain the high-magnification artificial graphite.
Wherein, the filling material in the first step is one or more of carbon nano tube, graphene, carbon black or acetylene black.
Wherein, the dispersion medium in the step one is one or more of petroleum tar, coal tar, heavy oil, acetone, ether or ethanol.
Wherein, the specific surfactant in the step one is one or more of oleic acid and polyethylene glycol (PEG).
Wherein, the screening in the fifth step adopts a 100-mesh 500-mesh vibrating screen, the specific surface area of the finished product obtained after magnetic removal and screening is less than 3.0 square meters per gram, D50 is 10-25 mu m, and the content of Fe is less than 100 ppm.
Wherein, the novel grinding mixer used in the second step comprises a mixing box 1, a first grinding roller 2, a second grinding roller 3, a rotating shaft 4, a gear 5, a motor 6, a feeding funnel 7, an induced draft fan 8, a material conveying pipe 9 and a sieve plate 10, the first grinding roller 2 and the second grinding roller 3 are symmetrically arranged inside two sides of the top end of the mixing box 1, the rotating shaft 4 is welded and fixed at two ends of the first grinding roller 2 and the second grinding roller 3, one end of the rotating shaft 4 penetrates through the two sides of the mixing box 1, the gear 5 is symmetrically and fixedly welded at one end of the first grinding roller 2 and one end of the second grinding roller 3 penetrating through the outside of the mixing box 1, the motor 6 is fixed on the outer wall of one side of the mixing box 1 by bolts, the other end of the second grinding roller 3 penetrates through the outside of the mixing box 1 and is fixedly connected with one end of an output shaft of the motor 6, the sieve plate 10 is welded and fixed on the outer walls of two sides of the mixing, the mixer box 1 is located one side inner wall above the sieve plate 10 and is inlayed and installed the draught fan 8, and the conveying end of draught fan 8 holds and runs through in the outside fixedly connected with conveying pipeline 9 of mixer box 1, and mixer box 1 is located and has link up on the outer wall of first grinding roller 2 and second grinding roller 3 top and install feed hopper 7, and the one end of conveying pipeline 9 runs through in one side inner wall of feed hopper 7.
Wherein, welded fastening has the board 11 that gathers materials on the bottom outer wall that mixing box 1 is located sieve 10 below, and through connection has discharging pipe 12 on the top one side outer wall that mixing box 1 bottom is located the board 11 that gathers materials.
Wherein, the junction of the rotating shaft 4 and the inner wall of one side of the mixing box 1 is provided with a bearing 13.
The properties of the examples are compared in the following table:
therefore, the graphite cathode material prepared by the invention has the characteristics of high multiplying power and excellent performance, is convenient to process and good in processing performance, and can meet the index requirements of various later-stage batteries in use.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A preparation method of a high-rate artificial graphite negative electrode material comprises the following steps: selecting and crushing materials; step two, mixing the ingredients; step three, granulating; step four, graphitizing; fifthly, demagnetizing and screening; the method is characterized in that:
in the first step, petroleum coke, needle coke and asphalt are selected as required, then the selected materials are respectively added into a crusher, the materials are crushed into particles with the particle size D50 of 1-7 mu m by the operation of the crusher, and fillers, dispersion media and specific surfactants are selected as required;
in the second step, the coke tailings selected in the first step are used as aggregates, and the asphalt tailings are binders, wherein the mass ratio of the aggregates to the binders to the fillers is 100: 0.1-0.8; the mass ratio of the binder to the dispersion medium is 1: 2-1: 4; the mass ratio of the adhesive to the specific surfactant is 100: 0.1-0.5, the aggregate, the binder, the filler, the dispersion medium and the specific surfactant are weighed in proportion and added into a novel grinding mixer, and all materials are fully mixed through the mixer to obtain a mixed material;
in the third step, the mixed material prepared in the second step is added into a hot coating reaction kettle for reaction processing, and then granulation is carried out in an inert atmosphere, and screening is carried out to obtain a granulated substance;
in the fourth step, under the protection of inert gas, carrying out carbonization heat treatment on the granulated substance obtained in the third step at 800-1000 ℃ for 10-50 hours, and then carrying out high-temperature graphitization on the carbonized granulated substance at 2800-3200 ℃ to obtain a graphitized mixed material;
and in the fifth step, the graphitized mixed material obtained in the fourth step is added into a demagnetizing screening machine for screening and demagnetizing to obtain the high-magnification artificial graphite.
2. The preparation method of the high-rate artificial graphite negative electrode material according to claim 1, which is characterized by comprising the following steps: the filler in the first step is one or more of carbon nano tube, graphene, carbon black or acetylene black.
3. The preparation method of the high-rate artificial graphite negative electrode material according to claim 1, which is characterized by comprising the following steps: the dispersion medium in the first step is one or more of petroleum tar, coal tar, heavy oil, acetone, ether or ethanol.
4. The preparation method of the high-rate artificial graphite negative electrode material according to claim 1, which is characterized by comprising the following steps: the specific surfactant in the first step is one or more of oleic acid and polyethylene glycol (PEG).
5. The preparation method of the high-rate artificial graphite negative electrode material according to claim 1, which is characterized by comprising the following steps: in the step five, a 100-mesh 500-mesh vibrating screen is adopted for screening, the specific surface area of a finished product obtained after magnetic removal and screening is less than 3.0 square meters per gram, D50 is 10-25 mu m, and the content of Fe is less than 100 ppm.
6. The preparation method of the high-rate artificial graphite negative electrode material according to claim 1, which is characterized by comprising the following steps: the novel grinding mixer used in the second step comprises a mixing box (1), a first grinding roller (2), a second grinding roller (3), a rotating shaft (4), a gear (5), a motor (6), a feeding funnel (7), an induced draft fan (8), a material conveying pipe (9) and a sieve plate (10), wherein the first grinding roller (2) and the second grinding roller (3) are symmetrically arranged inside two sides of the top end of the mixing box (1), the rotating shaft (4) is fixedly welded at two ends of the first grinding roller (2) and the second grinding roller (3), one end of the rotating shaft (4) penetrates through the two sides of the mixing box (1), the gear (5) is fixedly welded at one end of the first grinding roller (2) and one end of the second grinding roller (3) penetrate through the outer portion of the mixing box (1), the motor (6) is fixedly fixed on the outer wall of one side of the mixing box (1) through a bolt, the other end that roller (3) was ground to the second runs through in the outside of mixing box (1) and the output shaft one end fixed connection of motor (6), mixing box (1) is located first grinding roller (2) and second and grinds on the both sides outer wall of roller (3) below welded fastening have sieve (10), mixing box (1) is located and inlays on the one side inner wall of sieve (10) top and installs draught fan (8), the defeated material end of draught fan (8) runs through outside fixedly connected with conveying pipeline (9) in mixing box (1), mixing box (1) is located and is link up on the outer wall of first grinding roller (2) and second grinding roller (3) top and install feed hopper (7), the one end of conveying pipeline (9) runs through in one side inner wall of feed hopper (7).
7. The novel grinding apparatus of claim 5, wherein: mixing box (1) is located welded fastening on the bottom outer wall of sieve (10) below and has a material collecting plate (11), through connection has discharging pipe (12) on the top one side outer wall that mixing box (1) bottom is located material collecting plate (11).
8. The novel grinding apparatus of claim 5, wherein: and a bearing (13) is arranged at the joint of the rotating shaft (4) and the inner wall of one side of the mixing box (1).
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| CN112661148A (en) * | 2020-12-24 | 2021-04-16 | 宁波杉杉新材料科技有限公司 | Composite graphite negative electrode material, preparation method and application thereof, and lithium ion battery |
| CN114141993A (en) * | 2021-11-25 | 2022-03-04 | 广东凯金新能源科技股份有限公司 | Processing technology of composite modified graphite negative electrode with good cycling stability |
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