CN112871116A - Graphite negative electrode material low-temperature carbonization equipment and carbonization treatment method - Google Patents
Graphite negative electrode material low-temperature carbonization equipment and carbonization treatment method Download PDFInfo
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- 238000003763 carbonization Methods 0.000 title claims abstract description 61
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 40
- 239000010439 graphite Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 40
- 239000007773 negative electrode material Substances 0.000 title claims description 14
- 230000007246 mechanism Effects 0.000 claims abstract description 44
- 239000000463 material Substances 0.000 claims abstract description 40
- 238000002156 mixing Methods 0.000 claims abstract description 20
- 239000010406 cathode material Substances 0.000 claims abstract description 12
- 238000003756 stirring Methods 0.000 claims description 42
- 238000005469 granulation Methods 0.000 claims description 23
- 230000003179 granulation Effects 0.000 claims description 23
- 238000007599 discharging Methods 0.000 claims description 15
- 239000008187 granular material Substances 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 239000005539 carbonized material Substances 0.000 claims description 5
- 238000011068 loading method Methods 0.000 claims description 5
- 238000005485 electric heating Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 239000012774 insulation material Substances 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 17
- 230000000694 effects Effects 0.000 abstract description 7
- 238000005087 graphitization Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 229910001416 lithium ion Inorganic materials 0.000 description 6
- 206010024796 Logorrhoea Diseases 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 239000007770 graphite material Substances 0.000 description 3
- 229910021382 natural graphite Inorganic materials 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000006467 substitution reaction Methods 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
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/18—Stationary reactors having moving elements inside
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
- B01F27/90—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with paddles or arms
- B01F27/906—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with paddles or arms with fixed axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/75—Discharge mechanisms
- B01F35/754—Discharge mechanisms characterised by the means for discharging the components from the mixer
- B01F35/75455—Discharge mechanisms characterised by the means for discharging the components from the mixer using a rotary discharge means, e.g. a screw beneath the receptacle
- B01F35/754551—Discharge mechanisms characterised by the means for discharging the components from the mixer using a rotary discharge means, e.g. a screw beneath the receptacle using helical screws
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- 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
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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
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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
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention discloses a graphite cathode material low-temperature carbonization device and a carbonization treatment method, and the technical scheme is as follows: the method comprises the following steps: a roller furnace for low temperature carbonization; a forming and granulating mechanism for forming and granulating the graphite supplied in the roller furnace; the spiral feeding and scattering mechanism is used for conveying materials into the granulating mechanism; the horizontal mixing mechanism is used for fully mixing the materials scattered by the spiral feeding scattering mechanism; and a constant temperature control mechanism for keeping the carbonization constant temperature; the graphite cathode material has the advantages of high capacity, low volume expansion effect, good rate capability and cycle performance, simple and pollution-free process flow and high carbonization efficiency and carbonization quality.
Description
Technical Field
The invention belongs to the field of graphite cathode material processing, and particularly relates to low-temperature carbonization equipment and a carbonization treatment method for a graphite cathode material.
Background
A lithium ion battery is a secondary battery (rechargeable battery) that mainly operates by movement of lithium ions between a positive electrode and a negative electrode. In the process of charging and discharging, Li + is inserted and extracted back and forth between the two electrodes; during charging, Li + is extracted from the positive electrode and is inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharging; lithium ion batteries have many advantages such as high voltage, high energy, long cycle life, no memory effect, and have been widely used in the fields of consumer electronics, electric tools, medical electronics, and the like. The quality of the negative electrode material is one of the key factors determining the performance of the lithium ion battery, and therefore, the improvement of the production equipment and the process level of the negative electrode material becomes a technical problem to be solved at present.
The publication number is CN 205773366U's chinese patent, and it discloses a lithium ion battery negative pole graphite material production facility, including production facility, production facility is connected in proper order by broken case, well garrulous case, die mould box and calcination box and constitutes, installs the caping at the top of broken case, and the caping links together through control lever and broken case, broken case all is equipped with impeller and impeller branch with the inside of well garrulous case, and is provided with the passageway between broken case and the well garrulous case, the air-blower is installed in the left side of passageway, is equipped with the sieve mesh on the right side of passageway, the bleeder valve is installed to broken case and the bottom of well garrulous case, and the upper end of well garrulous case still is equipped with the feeding valve, the bottom of production facility is installed the residue and is collected the lid, the outside of calcination box is provided with annular heating pipe.
The patent has the advantages that graphite with different properties can be produced according to the pore diameters of different specifications and then applied to corresponding lithium-ion batteries, but the defects exist, for example, the stirring device is not arranged, the graphite material cannot be stirred, the contact area between the stirring blades and the material is limited, the mixing effect and the uniformity of the material are insufficient, the heat exchange is insufficient, and the increment effect of the coating particle size of the graphite material such as natural graphite, synthetic graphite and the like is low.
Disclosure of Invention
The invention aims to provide low-temperature carbonization equipment for graphite cathode materials, which is used for solving the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a graphite negative electrode material low temperature carbonization equipment comprises:
a roller furnace for low temperature carbonization;
a forming and granulating mechanism for forming and granulating the graphite supplied in the roller furnace;
the spiral feeding and scattering mechanism is used for conveying materials into the granulating mechanism;
the horizontal mixing mechanism is used for fully mixing the materials scattered by the spiral feeding scattering mechanism;
and a constant temperature control mechanism for keeping the carbonization constant temperature.
Preferably, the forming and granulating mechanism comprises a granulating kettle body, a stirring rod is rotatably connected in an inner cavity of the granulating kettle body, a plurality of fixed sleeves are fixedly connected on the stirring rod, stirring blades are fixedly connected on both sides of the fixed sleeves, the blade ends of the two stirring blades face opposite directions, a supporting rod is fixedly connected in the inner cavity of the granulating kettle body, the top end of the stirring rod is rotatably connected with the supporting rod, a first bevel gear is fixedly connected on the stirring rod, a first servo motor is fixedly installed on one side of the granulating kettle body, a connecting rod is fixedly connected with the end part of a motor shaft of the first servo motor, a second bevel gear is fixedly connected with the end part of the connecting rod, the first bevel gear and the second bevel gear are mutually meshed, a feeding pipe is fixedly communicated with the top of the granulating kettle body, and a discharging pipe is fixedly communicated with the bottom of the granulating kettle body, the one end fixedly connected with helical blade of bracing piece is kept away from to the puddler, helical blade extends to in the inner chamber of discharging pipe.
Preferably, the mechanism is broken up in spiral pay-off include with the fixed conveyer pipe of inlet pipe intercommunication, install the spiral delivery pole in the conveyer pipe, the mechanism is broken up in spiral pay-off still includes the feeding storehouse, the feeding storehouse with the conveyer pipe intercommunication, the one end installation of conveyer pipe is fixed with the drive the rotatory second servo motor of spiral delivery pole.
Preferably, horizontal mixing mechanism includes horizontal hopper, the horizontal hopper internal rotation is connected with the dwang, a plurality of hybrid blade of fixedly connected with on the dwang, one side-mounting of horizontal hopper is fixed with the drive the rotatory third servo motor of dwang.
Preferably, the constant temperature control mechanism comprises an electric heating plate, a nanometer high temperature resistant heat insulation material layer and a temperature detector.
Preferably, a motor shaft of the first servo motor is fixedly connected with the connecting rod, and the bottom end of the stirring rod is fixedly connected with the helical blade through a coupler.
Preferably, the bottom of the inner cavity of the granulation kettle body is fixedly connected with two inclined rods, a bearing seat is fixedly connected between the two inclined rods, and the bearing seat is rotatably connected with the stirring rod; a discharge valve is arranged on the discharge pipe and is made of stainless steel; the outer surface mounting of the granulation kettle body is fixed with and is used for controlling the function panel of granulation kettle body operation, the bottom fixedly connected with a plurality of supporting legs of the granulation kettle body.
A carbonization treatment method of a graphite cathode material is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: and conveying the cooled coated graphite granules to a carbonization workshop through a bin, loading the coated graphite granules into a sagger by using a screw feeder and a manipulator, and then continuously conveying the sagger into a roller furnace.
Step two: the temperature in the roller furnace is raised to 900-1000 ℃ by an electric control system to carry out carbonization reaction on the coated graphite granules in the saggar, and carbonized materials are formed after carbonization is finished.
The invention has the beneficial effects that:
1. when the device is used, the contact area between the stirring blades and the materials is increased through the reverse arrangement of the stirring blades, the materials in the granulating kettle can be fully stirred, the stirring dead angle is eliminated, the materials are uniformly mixed, meanwhile, the increment of the natural graphite coating particle size reaches 100%, the uniform mixing is achieved, the mixing efficiency is high, and the effect of increasing the graphite coating particle size is increased.
2. When the granulator is used, materials at the bottom of the granulator body can be rolled into the granulator body through the arrangement of the spiral blades, the rotation direction of the spiral blades can be adjusted through the adjustment of the forward rotation and the reverse rotation of the first servo motor, the discharge of the materials can be accelerated through the forward rotation during the discharging, the blockage of the materials is avoided, the materials accumulated in the discharging pipe can be rolled into the granulator body through the reverse rotation of the spiral blades, the stirring blades can fully mix the materials, the discharging can be accelerated, the blockage of the materials is avoided, the materials in the discharging pipe are rolled, the stirring dead angle is thoroughly eliminated, and the stirring efficiency is improved.
3. When the method is used, the flow of the method is simple and easy to realize, the carbon source can be fully carbonized during the carbonization reaction in the roller furnace, and the caking problem caused by violent reaction is avoided, so that the rate capability and the cycle performance of the material are improved, and the carbonization efficiency and the carbonization quality are improved.
4. The invention relates to a low-temperature carbonization treatment method which is different from the traditional high-temperature carbonization treatment process. The coating material can reduce the volatile components of the material and remove most of the volatile components under the conditions of 900-1000 ℃, thereby improving the bulk density of the material, effectively increasing the material loading capacity and improving the production efficiency in the subsequent graphitization process. Meanwhile, most of volatile components are removed in the carbonization process, so that furnace spraying accidents caused by discharge of the volatile components in the graphitization process can be avoided, and the safety of the graphitization processing process is improved. The carbonization process can be matched with a flue gas treatment device to realize the centralized treatment of the flue gas, and the flue gas in the graphitization process is inorganically discharged, thus causing environmental pollution.
Drawings
FIG. 1 is a schematic view of the structure of a raw material granulating apparatus according to the present invention;
FIG. 2 is a sectional view of the raw material granulating apparatus according to the present invention;
FIG. 3 is an enlarged view of the structure at A of the present invention;
FIG. 4 is an enlarged view of the structure of the present invention at B;
FIG. 5 is a schematic structural view of a spiral feeding and scattering mechanism for carbonized materials according to the present invention;
FIG. 6 is a schematic structural view of a horizontal mixing mechanism for carbonized materials according to the present invention;
FIG. 7 is a schematic view of the structure of the carbonization roller furnace of the present invention.
In the figure: 1. a granulation kettle body; 2. a stirring rod; 3. fixing a sleeve; 4. stirring blades; 5. a support bar; 6. a first bevel gear; 7. a second bevel gear; 8. a first servo motor; 9. a connecting rod; 10. a feed pipe; 11. a discharge pipe; 12. a helical blade; 13. a coupling; 14. an inclined lever; 15. a bearing seat; 16. a discharge valve; 17. a functional panel; 18. supporting legs; 19. a spiral feeding and scattering mechanism; 20. a horizontal mixing mechanism; 21. a delivery pipe; 22. a screw conveying rod; 23. a feeding bin; 24. a second servo motor; 25. a horizontal hopper; 26. rotating the rod; 27. a mixing blade; 28. a third servo motor; 29. a feed hopper; 30. a discharge port; 31. a granulation mechanism; 32. a roller furnace.
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.
Example 1
A graphite negative electrode material low temperature carbonization equipment comprises:
a roller oven 32 for low-temperature carbonization;
a forming and granulating mechanism 31 for forming and granulating the graphite supplied to the roller furnace 32;
a spiral feeding and scattering mechanism 19 for feeding the material into the granulating mechanism 31;
a horizontal mixing mechanism 20 for fully mixing the materials scattered by the spiral feeding scattering mechanism 19;
and a constant temperature control mechanism for keeping the carbonization constant temperature.
In this embodiment, preferably, the forming and granulating mechanism 31 includes a granulating kettle 1, a stirring rod 2 is rotatably connected in an inner cavity of the granulating kettle 1, a plurality of fixing sleeves 3 are fixedly connected on the stirring rod 2, stirring blades 4 are fixedly connected on both sides of the fixing sleeves 3, the blade ends of the two stirring blades 4 face oppositely, a supporting rod 5 is fixedly connected in the inner cavity of the granulating kettle 1, the top end of the stirring rod 2 is rotatably connected with the supporting rod 5, a first bevel gear 6 is fixedly connected on the stirring rod 2, a first servo motor 8 is fixedly installed on one side of the granulating kettle 1, a connecting rod 9 is fixedly connected at the end of a motor shaft of the first servo motor 8, a second bevel gear 7 is fixedly connected at the end of the connecting rod 9, the first bevel gear 6 is mutually engaged with the second bevel gear 7, a feeding pipe 10 is fixedly communicated with the top of the granulating kettle 1, a discharging pipe 11 is fixedly communicated with, one end of the stirring rod 2 far away from the support rod 5 is fixedly connected with a helical blade 12, and the helical blade 12 extends into the inner cavity of the discharge pipe 11.
In this embodiment, preferably, the spiral feeding and scattering mechanism 19 includes a conveying pipe 21 fixed in communication with the feeding pipe 10, a spiral conveying rod 22 is installed in the conveying pipe 21, the spiral feeding and scattering mechanism 19 further includes a feeding bin 23, the feeding bin 23 is communicated with the conveying pipe 21, and a second servo motor 24 for driving the spiral conveying rod 22 to rotate is installed and fixed at one end of the conveying pipe 21.
In this embodiment, preferably, the horizontal mixing mechanism 20 includes a horizontal hopper 25, a rotating rod 26 is rotatably connected to the horizontal hopper 25, a plurality of mixing blades 27 are fixedly connected to the rotating rod 26, and a third servo motor 28 for driving the rotating rod 26 to rotate is fixedly mounted on one side of the horizontal hopper 25.
In this embodiment, preferably, the constant temperature control mechanism includes an electric heating plate, a nanometer high temperature resistant insulating material layer, and a temperature detector.
In this embodiment, preferably, the motor shaft of the first servo motor 8 is fixedly connected with the connecting rod 9, and the bottom end of the stirring rod 2 is fixedly connected with the helical blade 12 through the coupler 13; the connection stability between the motor shaft and the connecting rod 9, between the stirring rod 2 and the helical blade 12 can be improved by connecting the shaft coupling 13, and meanwhile, the shaft coupling 13 has the advantages of energy absorption and shock absorption.
In the embodiment, preferably, the bottom of the inner cavity of the granulating kettle body 1 is fixedly connected with two inclined rods 14, a bearing seat 15 is fixedly connected between the two inclined rods 14, and the bearing seat 15 is rotatably connected with the stirring rod 2; a discharge valve 16 is arranged on the discharge pipe 11, and the material of the discharge valve 16 is stainless steel; a functional panel 17 for controlling the operation of the granulation kettle body 1 is fixedly arranged on the outer surface of the granulation kettle body 1, and a plurality of supporting legs 18 are fixedly connected to the bottom of the granulation kettle body 1; through the setting of bearing frame 15, can improve puddler 2 pivoted stability, the setting of function panel 17 can make easy operation, intellectuality.
A carbonization treatment method of a graphite cathode material comprises the following steps:
the method comprises the following steps: conveying the cooled coated graphite granules to a carbonization workshop through a bin, loading the coated graphite granules into a sagger by using a screw feeder and a manipulator, and then continuously conveying the sagger into a roller furnace;
step two: and raising the temperature in the roller furnace to 950 ℃ through an electric control system to carry out carbonization reaction on the coated graphite granules in the sagger, and forming a carbonized material after carbonization is finished.
The performance indexes of the products after carbonization treatment are shown in table 1:
table 1: comparison of product Properties
| Index (I) | Before charring | After charring |
| Tap density | 0.65g/cm3 | 0.85g/cm3 |
In this example, the tap density of the carbonized carbon material was from 0.65g/cm3Increased to 0.85g/cm3Most of volatile components can be removed, the bulk density of the material is improved, the material loading can be effectively increased in the subsequent graphitization process, and the production efficiency is improved. Meanwhile, most of volatile components are removed in the carbonization process, so that furnace spraying accidents caused by discharge of the volatile components in the graphitization process can be avoided, and the safety of the graphitization processing process is improved.
The working principle and the using process of the invention are as follows:
when the graphite negative electrode material low-temperature carbonization equipment and the carbonization treatment method are used, the contact area between the stirring blades 4 and materials is increased through the reverse arrangement of the stirring blades 4, the materials in the granulation kettle body 1 can be fully stirred, the stirring dead angle is avoided, the materials are ensured to be mixed more uniformly, meanwhile, the increment of the natural graphite coating particle size is 100%, the mixing uniformity is achieved, the mixing efficiency is higher, and the effect of the graphite coating particle size increment is increased.
When the graphite negative electrode material low-temperature carbonization equipment and the carbonization treatment method are used, the materials at the bottom of the granulation kettle body 1 can be turned into the granulation kettle body 1 through the arrangement of the spiral blade 12, the rotation direction of the spiral blade 12 can be adjusted through the adjustment of the positive and negative rotation of the first servo motor 8, the discharge of the materials can be accelerated through the positive rotation during the discharging, the material blockage is avoided, the materials accumulated in the discharging pipe 11 can be turned into the granulation kettle body 1 through the reverse rotation of the spiral blade 12, the stirring blades 4 can fully mix the materials, the discharging speed can be accelerated, the material blockage is avoided, the materials in the discharging pipe 11 can be turned, the stirring dead angle is thoroughly eliminated, and the stirring efficiency is improved.
When the low-temperature carbonization equipment and the carbonization treatment method for the graphite cathode material are used, the process of the method is simple and easy to realize, the carbon source can be fully carbonized during the carbonization reaction in the roller furnace, and the caking problem caused by violent reaction is avoided, so that the rate capability and the cycle performance of the material are improved, the carbonization efficiency and the carbonization quality can be improved, and the graphite cathode material prepared by the method can achieve the effects of high capacity of the graphite cathode material, low volume expansion effect, good rate capability and cycle performance, simple and pollution-free process flow and high carbonization efficiency and carbonization quality.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A low-temperature carbonization method of a graphite cathode material is characterized by comprising the following steps: the method comprises the following steps:
a roller furnace (32) for low temperature carbonization;
a forming and granulating mechanism (31) for forming and granulating the graphite supplied in the roller furnace (32);
a spiral feeding and scattering mechanism (19) for conveying materials into the granulating mechanism (31);
the horizontal mixing mechanism (20) is used for fully mixing the materials scattered by the spiral feeding scattering mechanism (19);
and a constant temperature control mechanism for keeping the carbonization constant temperature in the roller furnace (32).
2. The graphite negative electrode material low-temperature carbonization equipment as claimed in claim 1, wherein: the molding granulation mechanism (31) comprises a granulation kettle body (1), a stirring rod (2) is rotatably connected in an inner cavity of the granulation kettle body (1), a plurality of fixing sleeves (3) are fixedly connected to the stirring rod (2), stirring blades (4) are fixedly connected to two sides of the fixing sleeves (3), the blade ends of the two stirring blades (4) face oppositely, a supporting rod (5) is fixedly connected in the inner cavity of the granulation kettle body (1), the top end of the stirring rod (2) is rotatably connected with the supporting rod (5), a first bevel gear (6) is fixedly connected to the stirring rod (2), a first servo motor (8) is fixedly installed on one side of the granulation kettle body (1), a connecting rod (9) is fixedly connected to the end part of a motor shaft of the first servo motor (8), and a second bevel gear (7) is fixedly connected to the end part of the connecting rod (9), first bevel gear (6) with second bevel gear (7) intermeshing, the top intercommunication of the granulation cauldron body (1) is fixed with inlet pipe (10), the bottom intercommunication of the granulation cauldron body (1) is fixed with discharging pipe (11), puddler (2) are kept away from the one end fixedly connected with helical blade (12) of bracing piece (5), helical blade (12) extend to in the inner chamber of discharging pipe (11).
3. The graphite negative electrode material low-temperature carbonization equipment as claimed in claim 2, characterized in that: mechanism (19) is broken up in spiral pay-off include with conveyer pipe (21) that inlet pipe (10) intercommunication is fixed, install auger delivery pole (22) in conveyer pipe (21), mechanism (19) is broken up in spiral pay-off still includes feeding storehouse (23), feeding storehouse (23) with conveyer pipe (21) intercommunication, the one end installation of conveyer pipe (21) is fixed with the drive auger delivery pole (22) rotatory second servo motor (24).
4. The graphite negative electrode material low-temperature carbonization equipment as claimed in claim 1, wherein: horizontal mixing mechanism (20) are including horizontal hopper (25), horizontal hopper (25) internal rotation is connected with dwang (26), a plurality of hybrid blade (27) of fixedly connected with on dwang (26), one side installation of horizontal hopper (25) is fixed with the drive rotatory third servo motor (28) of dwang (26).
5. The graphite negative electrode material low-temperature carbonization equipment as claimed in claim 1, wherein: the constant temperature control mechanism comprises an electric heating plate, a nanometer high temperature resistant heat insulation material layer and a temperature detector.
6. The graphite negative electrode material low-temperature carbonization equipment as claimed in claim 2, characterized in that: the motor shaft of the first servo motor (8) is fixedly connected with the connecting rod (9), the bottom end of the stirring rod (2) is fixedly connected with the helical blade (12) through a coupler (13).
7. The graphite negative electrode material low-temperature carbonization equipment as claimed in claim 2, characterized in that: the bottom of the inner cavity of the granulating kettle body (1) is fixedly connected with two inclined rods (14), a bearing seat (15) is fixedly connected between the two inclined rods (14), and the bearing seat (15) is rotatably connected with the stirring rod (2); a discharge valve (16) is arranged on the discharge pipe (11), and the material of the discharge valve (16) is stainless steel; the outer surface mounting of the granulation kettle body (1) is fixed with a function panel (17) used for controlling the operation of the granulation kettle body (1), and the bottom of the granulation kettle body (1) is fixedly connected with a plurality of supporting legs (18).
8. A carbonization treatment method of a graphite cathode material is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: conveying the cooled coated graphite granules to a carbonization workshop through a bin, loading the coated graphite granules into a sagger by using a screw feeder and a manipulator, and then continuously conveying the sagger into a roller furnace;
step two: the temperature in the roller furnace is raised to 900-1000 ℃ by an electric control system to carry out carbonization reaction on the coated graphite granules in the saggar, and carbonized materials are formed after the carbonization is finished.
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Application publication date: 20210601 |