CN113921814B - Production process of brightening agent modified lithium ion battery graphite anode material - Google Patents
Production process of brightening agent modified lithium ion battery graphite anode material Download PDFInfo
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- CN113921814B CN113921814B CN202111164282.5A CN202111164282A CN113921814B CN 113921814 B CN113921814 B CN 113921814B CN 202111164282 A CN202111164282 A CN 202111164282A CN 113921814 B CN113921814 B CN 113921814B
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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
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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
- C01B32/21—After-treatment
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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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The application discloses a production process of a brightening agent modified lithium ion battery graphite anode material, which comprises the steps of mixing graphite with brightening agent in the production process, wherein the proportion of brightening agent to graphite is 0.01% -3%:100%; the first effect and the multiplying power performance of the produced graphite anode material can be improved by adopting the production process.
Description
Technical Field
The application relates to the technical field of production of graphite cathode materials of lithium ion batteries, in particular to a production process of a brightening agent modified graphite cathode material of a lithium ion battery.
Background
With the development of new energy power, lithium ion batteries are increasingly used, and the market of graphite cathode materials serving as key components of the lithium batteries is rapidly increased. The key process of graphite cathode material production is to raise graphitization degree and purity. Graphitization refers to the transformation of carbon atoms from disordered irregular arrangement to regular arrangement hexagonal plane network structure, namely a graphite microcrystalline structure, and aims to obtain performances of high electric conductivity, high heat conduction, corrosion resistance, friction resistance and the like of graphite.
The graphite anode material produced at present has low initial efficiency and low rate capability (1C/0.1C).
Disclosure of Invention
Aiming at the defects in the prior art, the application provides a production process of a brightening agent modified lithium ion battery graphite negative electrode material, and the first effect and the multiplying power performance of the produced graphite negative electrode material can be improved by adopting the production process.
A production process of a brightening agent modified lithium ion battery graphite cathode material comprises the steps of mixing graphite with brightening agent in the production process, wherein the proportion of brightening agent to graphite is 0.01% -3%:100%.
Preferably, the brightening agent is o-benzoyl sulfimide, and the ratio of the brightening agent to the graphite is 0.1%:100%.
Preferably, the brightening agent is bisbenzenesulfonimide, and the ratio of the brightening agent to the graphite is 1%:100%.
Preferably, the brightening agent is coumarin, and the ratio of the brightening agent to the graphite is 0.5%:100%.
Preferably, the brightening agent and the graphite are mixed in a graphitizing furnace, the graphitizing furnace comprises a furnace body and a cylinder, an induction coil for carrying out induction heating on the inner cavity of the furnace body is sleeved outside the furnace body, a discharging hole is formed in the bottom wall of the furnace body, a discharging valve is arranged at the discharging hole, a feeding hole is formed in the top of the furnace body, a feeding valve is arranged at the feeding hole, and an exhaust hole is formed in the top of the furnace body;
the induction coil is arranged outside the induction coil in a sleeved mode, a cavity is formed between the outer wall and the inner wall of the cylinder, an air inlet hole and an air outlet hole are formed in the side wall of the cavity, the air inlet hole is communicated with an air outlet hole in the furnace body through an air inlet pipe, an air outlet pipe is connected to the air outlet hole, an air outlet valve and a negative pressure fan are arranged in the air outlet pipe, a motor is arranged above the furnace body, an output shaft of the motor is connected with a stirring shaft, and the stirring shaft penetrates through the top wall of the furnace body to enter the inner cavity of the furnace body.
Preferably, the roof of furnace body has and holds the case, the (mixing) shaft passes the roof and the diapire that hold the case, have many arc passageway in the (mixing) shaft, the feed end and the discharge end of arc passageway all are in with the furnace body inner chamber intercommunication, the feed end and the discharge end of same arc passageway are in same height, the feed end height of many arc passageway has the difference, the inner wall of arc passageway includes outer inner wall and inner wall, the height of the high point of outer inner wall is higher than the height of the material in the furnace body, the height of the high point of inner wall is less than the height of the material in the furnace body, be provided with many exhaust passage in the (mixing) shaft, exhaust passage and arc passageway one-to-one, exhaust port of exhaust passage is located the highest point of the outer inner wall of arc passageway, the gas vent is located and holds the incasement, it has first gas vent to open on the case, first gas vent communicates with the inlet port through first intake pipe.
Preferably, the device further comprises a plurality of second feeding pipes, the heights of the exhaust ports of the plurality of exhaust channels are different, the stirring shaft is provided with a plurality of feeding units, the feeding units are longitudinally distributed, the feeding units are arranged in the accommodating box and are in one-to-one correspondence with the exhaust ports, each feeding unit comprises a first feeding pipe and a feeding disc, the stirring shaft penetrates through each feeding disc, each feeding disc is fixed on the stirring shaft, the bottom wall of each feeding disc is provided with a discharge port, the top end of each first feeding pipe is connected with each discharge port, and the bottom end of each first feeding pipe is connected with the corresponding exhaust port; the inner diameter of the feeding disc is gradually increased from top to bottom;
preferably, the plurality of second feeding pipes penetrate through the top wall of the accommodating box to enter the accommodating box, the plurality of second feeding pipes are respectively located above the plurality of feeding plates, the brightening agent can be discharged into the corresponding feeding plates through the second feeding pipes, and the feeding valves are arranged in the second feeding pipes.
Preferably, the top end of the second feeding pipe is connected with a hopper.
Preferably, the distance between the outer inner wall and the inner wall increases gradually in a downward-upward direction.
Preferably, the inner bottom wall of the feeding tray is inclined downward in the direction from the periphery of the discharge opening to the discharge opening.
The beneficial effects of the application are as follows: according to the technical scheme, graphite and a brightening agent are mixed, wherein the proportion of the brightening agent to the graphite is 0.01% -3%:100%; the brightening agent contains S, O, N and other atoms, is easy to combine with the graphite surface, improves the compatibility of the rest of the compatilizer, and improves the dispersion processing function of the graphite material in the homogenizing process; the brightening agent combined on the surface of the graphite reduces the potential difference caused by the rough surface of the graphite, thereby obtaining a uniform and compact SEI film and improving the first effect thereof; the self atoms such as S, O, N and the like of the brightening agent can optimize the active site on the surface of graphite, reduce the polarization impedance of the graphite and improve the multiplying power performance of the graphite.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.
FIG. 1 is a front cross-sectional view of a graphitizing furnace according to the present application;
FIG. 2 is a schematic view of the structure of the inside of the container of the present application;
FIG. 3 is a schematic view of the arc-shaped channel according to the present application.
In the drawing, a 1-furnace body, a 2-induction coil, a 3-cylinder, a 4-cavity, a 5-air inlet pipe, a 6-air outlet pipe, a 7-motor, an 8-stirring shaft, a 9-containing box, a 10-arc-shaped channel, an 11-air outlet channel, a 12-outer inner wall, a 13-inner wall, a 14-first air inlet pipe, a 15-first feed pipe, a 16-feed plate, a 17-second feed pipe and a 18-hopper are arranged.
Description of the embodiments
Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.
It is noted that unless otherwise indicated, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs.
Examples
In the embodiment, a production process of a brightening agent modified lithium ion battery graphite anode material is provided, graphite and brightening agent are mixed in the production process, wherein the proportion of brightening agent to graphite is 0.01% -3%:100%.
The brightening agent contains S, O, N and other atoms, is easy to combine with the graphite surface, improves the compatibility of the rest of the compatilizer, and improves the dispersion processing function of the graphite material in the homogenizing process.
The brightening agent combined on the surface of the graphite reduces the potential difference caused by the rough surface of the graphite, thereby obtaining uniform and compact SEI film and improving the first effect thereof.
The self atoms such as S, O, N and the like of the brightening agent can optimize the active site on the surface of graphite, reduce the polarization impedance of the graphite and improve the multiplying power performance (namely 1C/0.1C).
The processing performance of the graphite anode material modified by the brightening agent is greatly improved, and the first effect and the circulation of the material are obviously improved.
The brightening agent in this example may be used singly or in combination with graphite.
Examples
This example is further defined on the basis of example 1, wherein the brightening agent is phthalylsulfonyl imide and the ratio of brightening agent to graphite is 0.1%:100%.
The common product does not use a brightening agent, the specific surface area of the produced graphite anode material is 6.7, the gram capacity is 345.5 mAh/g, the initial effect is 85.6%, and the 1C/0.1C is 30%.
Through experiments, the phthaloyl sulfimide and graphite are used according to the proportion of 0.1 percent: after 100% mixing, the produced graphite anode material has a specific surface area of 5.8, a gram capacity of 347.1mAh/g, a first effect of 89.2% and a 1C/0.1C of 55%.
From the above, it can be seen that the first effect and the rate capability of the material can be greatly improved after the o-benzoyl sulfimide is used.
Examples
This example is further defined on the basis of example 1, wherein the brightening agent is bis-benzenesulfonyl imide and the ratio of brightening agent to graphite is 1%:100%.
The common product does not use a brightening agent, the specific surface area of the produced graphite anode material is 6.7, the gram capacity is 345.5 mAh/g, the initial effect is 85.6%, and the 1C/0.1C is 30%.
Through experiments, bis-benzenesulfonimide and graphite are used in a proportion of 1%: after 100% mixing, the produced graphite anode material has a specific surface area of 3.0, a gram capacity of 348.3mAh/g, a first effect of 91.0% and a 1C/0.1C of 61%.
From the above, the first effect and the multiplying power performance of the material can be greatly improved after the bisbenzenesulfonimide is used.
Examples
This example is further defined on the basis of example 1, wherein the brightening agent is coumarin and the ratio of brightening agent to graphite is 0.5%:100%.
The common product does not use a brightening agent, the specific surface area of the produced graphite anode material is 6.7, the gram capacity is 345.5 mAh/g, the initial effect is 85.6%, and the 1C/0.1C is 30%.
Through experiments, coumarin and graphite are used according to the proportion of 0.5 percent: after 100% mixing, the produced graphite anode material has a specific surface area of 4.2, a gram capacity of 348.8mAh/g, a first effect of 91.5% and a 1C/0.1C of 72%.
From the above, the first effect and the multiplying power performance of the material can be greatly improved after coumarin is used.
Examples
As shown in fig. 1, fig. 2 and fig. 3, the embodiment is further defined on the basis of embodiment 1, in this embodiment, the brightening agent and graphite are mixed in a graphitization furnace, the graphitization furnace comprises a furnace body 1 and a cylinder 3, an induction coil 2 for performing induction heating on the inner cavity of the furnace body 1 is sleeved outside the furnace body 1, a discharging hole is formed in the bottom wall of the furnace body 1, a discharging valve is arranged at the discharging hole, a feeding hole is formed in the top of the furnace body 1, a feeding valve is arranged at the feeding hole, and an exhaust hole is formed in the top of the furnace body 1;
the cylinder 3 is sleeved outside the induction coil 2, a cavity 4 is formed between the outer wall and the inner wall of the cylinder 3, an air inlet hole and an air outlet hole are formed in the side wall of the cavity 4, the air inlet hole is communicated with an air outlet hole in the furnace body 1 through an air inlet pipe 5, an air outlet pipe 6 is connected to the air outlet hole, an air outlet valve and a negative pressure fan are arranged in the air outlet pipe 6, a motor 7 is arranged above the furnace body 1, a stirring shaft 8 is connected to an output shaft of the motor 7, and the stirring shaft 8 penetrates through the top wall of the furnace body 1 to enter the inner cavity of the furnace body 1.
In the embodiment, the stirring shaft 8 is in rotary sealing connection with the top wall of the furnace body 1.
In this embodiment, through establishing drum 3 cover in furnace body 1 outside, set up cavity 4 in the drum 3, inlet port and venthole are seted up to cavity 4 lateral wall, inlet port and the last exhaust hole intercommunication of furnace body 1, vent outlet duct 6 is connected to venthole department, set up valve and negative pressure fan in the outlet duct 6, outlet duct 6 is connected with air purification device, when using, firstly open valve and negative pressure fan, take cavity 4 and furnace body 1 inner chamber into the negative pressure state back with all, then add the material to furnace body 1 inner chamber through the feed port, start motor 7 and induction coil 2, while heating the material, mix the material, make the gaseous discharge between the material granule simultaneously, because be in the negative pressure state in the cavity 4, consequently, exhaust gas that produces in the furnace body 1 enters into cavity 4, after the gaseous accumulation in cavity 4 a period, open valve and negative pressure fan, exhaust gas discharge in the cavity 4 handles, so can store the exhaust gas and discharge after a certain amount, make exhaust gas centralize the treatment, air purification device only need open when the exhaust gas can, energy consumption of the purification device can be reduced like this.
In this embodiment, the top wall of the furnace body 1 has a containing box 9, the stirring shaft 8 passes through the top wall and the bottom wall of the containing box 9, a plurality of arc channels 10 are arranged in the stirring shaft 8, the feeding end and the discharging end of each arc channel 10 are communicated with the inner cavity of the furnace body 1, the feeding end and the discharging end of the same arc channel 10 are positioned at the same height, the feeding ends of the plurality of arc channels 10 have different heights, the inner wall of each arc channel 10 comprises an outer inner wall 12 and an inner wall 13, the highest point of the outer inner wall 12 is higher than the height of materials in the furnace body 1, the highest point of the inner wall 13 is lower than the height of the materials in the furnace body 1, a plurality of exhaust channels 11 are arranged in the stirring shaft 8, the exhaust channels 11 are in one-to-one correspondence with the arc channels 10, the air inlets of the exhaust channels 11 are positioned at the highest point of the outer inner wall 12 of the arc channels 10, the exhaust ports of the exhaust channels 11 are positioned in the containing box 9, the containing box 9 is provided with a first exhaust port, the first exhaust port is communicated with the first air inlet pipe 14, and the horizontal line in fig. 3 indicates the height of the materials.
In this embodiment, the stirring shaft 8 is in rotary sealing connection with the top wall and the bottom wall of the accommodating box 9.
The graphitization process is that granular graphite forms semi-molten state after heating and then forms crystalline state after cooling, in the graphitization process at present, waste gas is discharged into the furnace body 1 after being conveyed to the upper part of the material, and the waste gas generated by mixing the bottom materials is not easy to discharge due to the blocking of the upper part of the waste gas, particularly when graphite is in a semi-molten state, air at the lower part is blocked by the upper part of the semi-molten state and can not be basically discharged, so that the produced product is internally provided with micro-gaps, and the quality of the product is poor.
In this embodiment, the stirring shaft 8 extends into the bottom of the inner cavity of the furnace body 1, a plurality of arc-shaped channels 10 are arranged in the stirring shaft 8, the feeding end and the discharging end of each arc-shaped channel 10 are communicated with the inner cavity of the furnace body 1, the feeding end and the discharging end of the same arc-shaped channel 10 are at the same height, and the heights of the feeding ends of the plurality of arc-shaped channels 10 are different.
When graphite is in the granule, have the clearance between granule and the granule, gas can get into from the feed end of arc passageway 10 and then discharge through exhaust passage 11, because the gas vent of exhaust passage 11 is located and holds case 9 here, consequently (mixing) shaft 8 is rotatory also not influencing the discharge of waste gas, because the feed end height of different exhaust passage 11 has the difference, consequently can discharge the gas that the material of different heights produced in the stirring process, improves waste gas discharge efficiency and discharge effect.
When graphite is heated from a granular state to a semi-molten state, gaps between the semi-molten states are small, exhaust is very difficult, and exhaust gas generated by stirring of bottom graphite can not be discharged basically, in the embodiment, the inner wall provided with the arc-shaped channel 10 comprises an outer inner wall 12 and an inner wall 13, the highest point of the outer inner wall 12 is higher than the height of the material in the furnace body 1, and the highest point of the inner wall 13 is lower than the height of the material in the furnace body 1; thus, as the stirring shaft 8 rotates, semi-molten materials can enter from the feeding end of the arc-shaped channel 10, pass through the arc-shaped channel 10 and then are discharged from the discharging end of the arc-shaped channel 10, and as the highest point of the outer inner wall 12 at the top of the arc-shaped channel is higher than the height of the materials in the furnace body 1 and the highest point of the inner wall 13 is lower than the height of the materials in the furnace body 1 and the height of the semi-molten liquid level of the materials is limited, the materials can not always contact the highest point of the outer inner wall 12 when passing through the arc-shaped channel 10, namely, when the semi-molten materials move to the top of the arc-shaped channel 10, the upper part of the semi-molten materials is not blocked by the materials, so that the internal air can be discharged, and the exhaust efficiency and the exhaust effect of the exhaust gas inside the materials can be optimized.
The embodiment further comprises a plurality of second feeding pipes 17, the heights of the exhaust ports of the plurality of exhaust channels 11 are different, the stirring shaft 8 is provided with a plurality of feeding units, the feeding units are longitudinally distributed, the feeding units are arranged in the accommodating box 9 and are in one-to-one correspondence with the exhaust ports, each feeding unit comprises a first feeding pipe 15 and a feeding disc 16, the stirring shaft 8 penetrates through the feeding disc 16, the feeding disc 16 is fixed on the stirring shaft 8, the bottom wall of the feeding disc 16 is provided with a discharge port, the top end of the first feeding pipe 15 is connected with the discharge port, and the bottom end of the first feeding pipe 15 is connected with the corresponding exhaust port; the inner diameter of the feed tray 16 gradually increases in the top-down direction;
the plurality of second inlet pipes 17 all penetrate the roof that holds case 9 and get into and hold case 9, and a plurality of second inlet pipes 17 are located the top of a plurality of feed trays 16 respectively, and the brightening agent can be discharged into corresponding feed tray 16 through second inlet pipe 17, is provided with the feed valve in the second inlet pipe 17.
In the graphitization process, the process is carried out under the high temperature condition, the brightening agent and the graphite are directly mixed at the beginning, waste gas is arranged in the materials, the waste gas can react with the brightening agent under the high temperature condition, so that the production effect of a product is poor, when the waste gas in the semi-molten material is exhausted, the brightening agent is directly added from the top, then the brightening agent is difficult to move to the bottom materials to realize uniform mixing because of small gaps of the semi-molten material, in the embodiment, a feeding unit and a second feeding pipe 17 are arranged, after the waste gas in the materials is exhausted, a feeding valve on the second feeding pipe 17 is opened, the brightening agent is added into the feeding plate 16, the feeding plate 16 and the first feeding pipe 15 simultaneously rotate along with a stirring shaft 8, even if the stirring shaft 8 rotates, the brightening agent can enter the feeding plate 16, the brightening agent can be mixed with the semi-molten material through an exhaust channel 11 and an arc-shaped channel 10, the brightening agent can be prevented from reacting with the waste gas, meanwhile, the brightening agent enters into the feeding plates 16 through a plurality of second feeding pipes 17, and then enters into the arc-shaped channels 10 through the exhaust channels 11, the arc-shaped channels 1 and the depth of each arc-shaped material can be mixed with the arc-shaped material after the semi-molten material is exhausted, the depth of each channel 1 is matched with the best, and the deep effect of the production effect can be realized.
A hopper 18 is connected to the top of the second feed tube 17 in this embodiment to facilitate the addition of brightener to the tray 16.
In this embodiment, the distance between the outer inner wall 12 and the inner wall 13 gradually increases from the bottom to the top.
The height of the granular material in the initial state is positioned between the top of the outer inner wall 12 and the top of the inner wall 13, when the material is changed into a semi-molten state from the granular state, the height of the material is reduced due to gas discharge, the distance between the outer inner wall 12 and the inner wall 13 is gradually increased, and thus, a larger height difference is formed between the top of the outer inner wall 12 and the top of the inner wall 13, and the height of the material is still positioned between the top of the outer inner wall 12 and the top of the inner wall 13 after the material is ensured to be in the semi-molten state and reduced by a certain height.
In this embodiment, the inner bottom wall of the feeding tray 16 is inclined downward in the direction from the periphery of the discharge opening to the discharge opening, so that the brightening agent in the feeding tray 16 can conveniently enter the second feeding pipe 17.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the appended claims and description.
Claims (8)
1. A production process of a brightening agent modified lithium ion battery graphite negative electrode material is characterized in that graphite and brightening agent are mixed in the production process, wherein the proportion of brightening agent to graphite is 0.01% -3%:100%;
the brightening agent and graphite are mixed in a graphitizing furnace, the graphitizing furnace comprises a furnace body (1) and a cylinder (3), an induction coil (2) for carrying out induction heating on the inner cavity of the furnace body (1) is sleeved outside the furnace body (1), a discharging hole is formed in the bottom wall of the furnace body (1), a discharging valve is arranged at the discharging hole, a feeding hole is formed in the top of the furnace body (1), a feeding valve is arranged at the feeding hole, and an exhaust hole is formed in the top of the furnace body (1);
the cylinder (3) is sleeved outside the induction coil (2), a cavity (4) is formed between the outer wall and the inner wall of the cylinder (3), an air inlet hole and an air outlet hole are formed in the side wall of the cavity (4), the air inlet hole is communicated with an air outlet hole on the furnace body (1) through an air inlet pipe (5), an air outlet pipe (6) is connected to the air outlet hole, an air outlet valve and a negative pressure fan are arranged in the air outlet pipe (6), a motor (7) is arranged above the furnace body (1), a stirring shaft (8) is connected to an output shaft of the motor (7), and the stirring shaft (8) penetrates through the top wall of the furnace body (1) to enter the inner cavity of the furnace body (1);
the roof of furnace body (1) has and holds case (9), (8) pass roof and the diapire that hold case (9), have many arc passageway (10) in (8) of (8), the feed end and the discharge end of arc passageway (10) all communicate with furnace body (1) inner chamber, the feed end and the discharge end of same arc passageway (10) are in same height, the feed end height of many arc passageway (10) has the difference, the inner wall of arc passageway (10) includes outer inner wall (12) and inner wall (13), the high of the highest point of outer inner wall (12) is higher than the height of the interior material of furnace body (1), the high of the highest point of inner wall (13) is less than the height of the interior material of furnace body (1), be provided with many exhaust passage (11) in (8) of (8), the air inlet of exhaust passage (11) is located the highest point of arc passageway (10) outer inner wall (12), the gas vent of exhaust passage (11) is located and holds case (9), it has first gas inlet port (14) to hold through first gas inlet port (14).
2. The process for producing the brightening agent modified lithium ion battery graphite anode material according to claim 1, wherein the brightening agent is o-benzoyl sulfimide, and the ratio of the brightening agent to the graphite is 0.1%:100%.
3. The process for producing the brightening agent modified lithium ion battery graphite anode material according to claim 1, wherein the brightening agent is bisbenzenesulfonimide, and the ratio of brightening agent to graphite is 1%:100%.
4. The process for producing the brightening agent modified lithium ion battery graphite anode material according to claim 1, wherein the brightening agent is coumarin, and the ratio of brightening agent to graphite is 0.5%:100%.
5. The production process of the brightener modified lithium ion battery graphite anode material according to claim 1, further comprising a plurality of second feeding pipes (17), wherein the heights of exhaust ports of a plurality of exhaust channels (11) are different, a plurality of feeding units are arranged on the stirring shaft (8) and longitudinally distributed, the feeding units are arranged in the containing box (9) and are in one-to-one correspondence with the exhaust ports, each feeding unit comprises a first feeding pipe (15) and a feeding disc (16), the stirring shaft (8) penetrates through the feeding disc (16), the feeding disc (16) is fixed on the stirring shaft (8), a discharge port is formed in the bottom wall of the feeding disc (16), the top end of the first feeding pipe (15) is connected with the discharge port, and the bottom end of the first feeding pipe (15) is connected with the corresponding exhaust port; the inner diameter of the feeding disc (16) is gradually increased from top to bottom;
the plurality of second feeding pipes (17) penetrate through the top wall of the accommodating box (9) and enter the accommodating box (9), the plurality of second feeding pipes (17) are respectively located above the plurality of feeding plates (16), the brightening agent can be discharged into the corresponding feeding plates (16) through the second feeding pipes (17), and feeding valves are arranged in the second feeding pipes (17).
6. The process for producing the brightener modified lithium ion battery graphite negative electrode material according to claim 5, wherein the top end of the second feeding pipe (17) is connected with a hopper (18).
7. The process for producing a brightener-modified lithium ion battery graphite negative electrode material according to claim 1, wherein the distance between the outer inner wall (12) and the inner wall (13) increases gradually from bottom to top.
8. The process for producing a brightener-modified lithium ion battery graphite negative electrode material according to claim 6, wherein the inner bottom wall of the feed tray (16) is inclined downward as a whole in a direction from the periphery of the discharge port to the discharge port.
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| JP2003171110A (en) * | 2001-09-26 | 2003-06-17 | Kawasaki Steel Corp | Method for manufacturing graphite material, negative pole material for lithium ion secondary battery and lithium ion secondary battery |
| CN105218996A (en) * | 2015-11-17 | 2016-01-06 | 重庆理工大学 | A kind of preparation method of modified graphene-polyvinyl alcohol compound film |
| CN111490238A (en) * | 2020-04-14 | 2020-08-04 | 苏州华赢新能源材料科技有限公司 | Phenyl organic acid compound modified graphite anode material and preparation method thereof |
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