CN109004193B - Lithium ion battery cathode carbonization device and carbonization method thereof - Google Patents
Lithium ion battery cathode carbonization device and carbonization method thereof Download PDFInfo
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- CN109004193B CN109004193B CN201810787640.XA CN201810787640A CN109004193B CN 109004193 B CN109004193 B CN 109004193B CN 201810787640 A CN201810787640 A CN 201810787640A CN 109004193 B CN109004193 B CN 109004193B
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- H01M10/05—Accumulators with non-aqueous electrolyte
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Abstract
The invention discloses a lithium ion battery cathode carbonization device which comprises a liquid storage tank, wherein a condenser, a carbonization tank and a dryer communicated with the interior of the liquid storage tank are fixedly arranged at the upper end of the liquid storage tank; an exhaust pipe is arranged on the dryer; a display screen and a processor electrically connected with the display screen are arranged on the side surface of the liquid storage tank; the upper end of the carbonization box is detachably and hermetically connected with a box cover; the condenser is respectively communicated with the interior of the carbonization tank and the interior of the liquid storage tank through an air inlet pipe and an air outlet pipe; an infusion pump is installed on the bottom of the liquid storage tank, and a liquid inlet pipe communicated with the interior of the carbonization tank is installed on the infusion pump. Has the advantages that: the lithium ion battery cathode carbonization device and the carbonization method thereof can recycle amorphous carbon precursor solution, so that coating materials are saved, the material consumption cost is reduced, and the carbonization effect is good.
Description
Technical Field
The invention relates to the field of lithium batteries, in particular to a lithium ion battery cathode carbonization device and a carbonization method thereof.
Background
Graphite materials such as graphite powder, graphite film and the like are widely used as negative electrode materials in lithium batteries due to unique electrical and thermal properties of the graphite materials, and although graphite used in lithium ion batteries has the advantages of high working voltage, large specific energy, light weight, small volume, long cycle life, rapid charge and discharge, no environmental pollution and the like, the compatibility of graphite and electrolyte is poor, so that the application of pure graphite in lithium ion batteries is limited. Therefore, the graphite material must be modified, and the surface of the graphite is coated with a layer of amorphous carbon material to improve the tap density and increase the charge and discharge capacity of the battery.
At present, the conventional coating method generally comprises pouring a graphite negative electrode material into an amorphous carbon precursor solution, stirring, heating the solution while evaporating the solution, so that the amorphous carbon precursor is coated on the surface of the graphite material, and then putting the graphite negative electrode material into a carbonization furnace to carbonize the amorphous carbon precursor, so as to form a layer of amorphous carbon coating material on the surface of the graphite negative electrode material.
The coating method has the problem that the amorphous carbon precursor solution is seriously wasted in the using process, the amorphous carbon precursor solution is directly discharged to the outdoor air after being evaporated, and is not aligned for recycling, so that the coating material is high in cost, and the graphite cathode material is put into a carbonization furnace for carbonization, so that the time is spent on carrying and conveying, the time and the labor are wasted, and the production cycle of the coating production process is influenced;
although the chinese patent with application number 201420833545.6 discloses a negative electrode material graphite coating carbonization device for lithium ion batteries (comprising a carbonization box, a box cover, a regulation motor and an electromagnetic induction coil, wherein the carbonization box comprises a heat preservation layer and a heat conduction layer, a heating resistance wire is arranged between the heat preservation layer and the heat conduction layer, the regulation motor is fixed on the box cover at the top end of the carbonization box, a stirring paddle and a stirring rod are fixedly arranged on a rotating shaft connected with the regulation motor, the tail end of the stirring rod is connected with a side wall scraper, the tail end of the rotating shaft is provided with a bottom scraper, the electromagnetic induction coil is wound on the outer wall of the carbonization box, the box cover is connected with a feed pipe with a one-way valve and an outlet pipe with a filter screen, the outlet pipe is connected with a discharge pipe through a fan, and an infrared thermometer and a thermocouple are arranged in the carbonization box), thereby avoiding the trouble, however, the above negative electrode material graphite-coated carbonization device for lithium ion batteries still has the problems that the amorphous carbon precursor solution is directly discharged to the outdoor air after being evaporated in the use process, the amorphous carbon precursor solution is not recycled, the waste phenomenon is serious, and the cost of the coating material is high.
Disclosure of Invention
The invention aims to solve the problems that a large amount of amorphous carbon precursor solution is needed to be consumed during the operation of the traditional lithium ion battery negative electrode carbonizing device in the prior art, the cost of coating materials is high, the carbonizing effect is poor, and the like. The preferred technical scheme of the technical schemes provided by the invention can realize the recycling of the amorphous carbon precursor solution and save the coating material, so that the material cost can be reduced, and the technical effects of good carbonization effect and the like are achieved, and are explained in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a lithium ion battery cathode carbonization device which comprises a liquid storage tank, wherein a condenser, a carbonization tank and a dryer communicated with the interior of the liquid storage tank are fixedly arranged at the upper end of the liquid storage tank; an exhaust pipe is arranged on the dryer; a display screen and a processor electrically connected with the display screen are arranged on the side surface of the liquid storage tank; the upper end of the carbonization box is detachably and hermetically connected with a box cover; the condenser is respectively communicated with the interior of the carbonization tank and the interior of the liquid storage tank through an air inlet pipe and an air outlet pipe; an infusion pump is arranged on the bottom of the liquid storage tank, and a liquid inlet pipe communicated with the interior of the carbonization tank is arranged on the infusion pump;
a stirring motor, a feeding hopper and a rotating motor are fixedly arranged on the upper surface of the box cover, a stirring shaft with the upper end fixedly connected with an output shaft of the stirring motor and a sealing plate tightly attached to the lower surface of the box cover and fixedly connected with an output shaft at the lower end of the rotating motor are arranged on the lower surface of the box cover in a rolling manner, a discharging hole communicated with the feeding hopper is formed in the sealing plate, stirring paddles are fully distributed on the side surface of the stirring shaft, a sieve plate in rolling connection with the lower end of the stirring shaft is fixedly arranged at the lower end of the inner wall of the carbonization box, and a temperature sensor electrically connected with the processor is; through holes are distributed on the bottom surface of the inner side of the carbonization box, and a cavity chamber communicated with the through holes is arranged inside the bottom surface of the carbonization box; a liquid outlet pipe communicated with the hollow chamber is arranged on the top surface of the inner side of the liquid storage tank;
a nitrogen bottle and a hot air dryer which is communicated with the nitrogen bottle and the cavity chamber through a gas delivery pipe and an air delivery pipe respectively are arranged on the outer wall of the carbonization box; control valves are arranged on the gas pipe, the air supply pipe and the liquid outlet pipe.
Preferably, an access door is hinged to the outer wall of the liquid storage box.
Preferably, the upper end of the air inlet pipe extends into the carbonization box from the upper surface of the box cover.
Preferably, the lower end of the air outlet pipe extends into the bottom of the inner side of the liquid storage tank.
Preferably, the liquid inlet pipe is communicated with the upper end of the inner wall of the carbonization box.
Preferably, the lower end of the liquid outlet pipe is provided with a solution filter.
Preferably, the number of the blanking holes is multiple, and the blanking holes are distributed in a centrosymmetric manner by taking the rotating motor as a center.
A lithium ion battery negative pole carbonization method executes the following steps:
the method comprises the following steps: respectively adding the amorphous carbon precursor solution and the graphite cathode material to be carbonized into a liquid storage tank and a feeding hopper, and then starting an infusion pump and a rotating motor to enable the amorphous carbon precursor solution and the graphite cathode material to enter the carbonization tank through a liquid inlet pipe and a blanking hole;
step two: starting a stirring motor, mixing and stirring the amorphous carbon precursor solution and the graphite cathode material which enter the carbonization box, closing the infusion pump when the graphite cathode material is fed and the amorphous carbon precursor solution just submerges the graphite cathode material, stopping continuously conveying the amorphous carbon precursor solution into the carbonization box, and simultaneously starting the rotating motor to drive a sealing plate to rotate so as to seal the lower end of the feeding hopper;
step three: after continuously stirring for a period of time, opening a control valve on a liquid outlet pipe, completely putting the amorphous carbon precursor solution in the carbonization tank into the liquid storage tank, and then closing the control valve;
step four: opening the control valves on the gas delivery pipe and the blast pipe, starting the hot air dryer, enabling nitrogen in a nitrogen bottle to enter the hot air dryer through the gas delivery pipe for heating, enabling the heated hot nitrogen to enter the cavity chamber through the blast pipe and flow out upwards from the through hole to heat the graphite cathode material, enabling the amorphous carbon precursor solution on the surface of the graphite cathode material to be heated and evaporated by the hot nitrogen, so that the amorphous carbon precursor is coated on the surface of the graphite cathode material, and then carbonizing the amorphous carbon precursor coated on the surface of the graphite cathode material to form an amorphous carbon coated material along with continuous heating of the hot nitrogen; hot nitrogen flows through a large amount of graphite cathode materials above the sieve plate from bottom to top in the carbonization box and then enters the condenser from the air inlet pipe for cooling; the gas entering the condenser is provided with evaporated amorphous carbon precursor solution steam besides hot nitrogen, after the mixed gas is cooled in the condenser, the temperature of the hot nitrogen is reduced, and the amorphous carbon precursor solution steam is liquefied into amorphous carbon precursor solution; and the nitrogen and the amorphous carbon precursor solution enter the liquid storage tank through an air outlet pipe, and then the nitrogen is dried by a dryer and then is discharged from an exhaust pipe.
Preferably, the stirring motor does not stop rotating during the heating of the graphite anode material in the carbonization chamber by the hot nitrogen gas in the fourth step.
Has the advantages that: the lithium ion battery cathode carbonization device and the carbonization method thereof can recycle amorphous carbon precursor solution, so that coating materials are saved, the material consumption cost is reduced, and the carbonization effect is good.
Drawings
In order to more clearly illustrate the embodiments of the present invention 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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a front view of the present invention;
FIG. 2 is an internal block diagram of FIG. 1 of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2 of the present invention;
fig. 4 is a schematic view of the structure of the sealing plate of the present invention.
The reference numerals are explained below:
1. a liquid storage tank; 2. an access door; 3. a condenser; 4. an air outlet pipe; 5. an air inlet pipe; 6. a carbonization tank; 7. an infusion pump; 8. a liquid inlet pipe; 9. a dryer; 10. an exhaust pipe; 11. a box cover; 12. a stirring motor; 13. feeding a hopper; 14. a rotating electric machine; 15. a sealing plate; 16. a blanking hole; 17. a stirring shaft; 18. a stirring paddle; 19. a temperature sensor; 20. a display screen; 21. a processor; 22. a nitrogen gas cylinder; 23. a hot air dryer; 24. a control valve; 25. a gas delivery pipe; 26. an air supply pipe; 27. a liquid outlet pipe; 28. a solution filter; 29. a hollow chamber; 30. a through hole; 31. and (4) a sieve plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Referring to fig. 1-4, the lithium ion battery negative pole carbonizing apparatus provided by the present invention comprises a liquid storage tank 1, wherein the liquid storage tank 1 is used for storing amorphous carbon precursor solution, a condenser 3, a carbonizing tank 6 and a dryer 9 communicated with the inside of the liquid storage tank 1 are fixedly installed at the upper end of the liquid storage tank 1, the condenser 3 is used for cooling the wet and hot nitrogen and the amorphous carbon precursor solution vapor discharged from the carbonizing tank 6, such that amorphous carbon precursor solution vapor can be prevented from being directly discharged to the outside to cause amorphous carbon precursor waste, the amorphous carbon precursor solution vapor can be re-refluxed into the liquid storage tank 1 for secondary utilization after being liquefied in the condenser 3, the amorphous carbon precursor solution is effectively saved, the cost of the amorphous carbon precursor solution is reduced, and the dryer 9 is used for drying the nitrogen and then discharging from an exhaust pipe 10; the drier 9 is provided with an exhaust pipe 10; a display screen 20 and a processor 21 electrically connected with the display screen 20 are installed on the side surface of the liquid storage tank 1, the processor 21 is used for processing the temperature signal detected by the temperature sensor 19 and displaying the processed temperature data on the display screen 20 for a worker to check, so that the worker can conveniently adjust the heating power of the hot air dryer 23; the upper end of the carbonization box 6 is detachably and hermetically connected with a box cover 11; the condenser 3 is respectively communicated with the interior of the carbonization tank 6 and the interior of the liquid storage tank 1 through an air inlet pipe 5 and an air outlet pipe 4; an infusion pump 7 is arranged on the bottom in the liquid storage tank 1, the infusion pump 7 is used for conveying the amorphous carbon precursor solution in the liquid storage tank 1 to the carbonization tank 6, and a liquid inlet pipe 8 communicated with the interior of the carbonization tank 6 is arranged on the infusion pump 7;
the upper surface of the box cover 11 is fixedly provided with a stirring motor 12, the device comprises a feeding hopper 13 and a rotating motor 14, wherein the rotating motor 14 is used for driving a sealing plate 15 to rotate to control the feeding hopper 13 to discharge materials, a stirring shaft 17 with the upper end fixedly connected with an output shaft of a stirring motor 12 and a sealing plate 15 tightly attached to the lower surface of the box cover 11 to roll and fixedly connected with an output shaft at the lower end of the rotating motor 14 are arranged on the lower surface of the box cover 11 in a rolling manner, the sealing plate 15 is used for sealing the feeding hopper 13 and preventing hot nitrogen from escaping from the feeding hopper 13, a discharging hole 16 communicated with the feeding hopper 13 is formed in the sealing plate 15, stirring paddles 18 are fully distributed on the side surface of the stirring shaft 17, a sieve plate 31 in rolling connection with the lower end of the stirring shaft 17 is fixedly arranged at the lower end of the inner wall of the carbonization box 6, the sieve plate 31 is used for preventing graphite cathode materials from falling onto the bottom of the; the bottom surface of the inner side of the carbonization box 6 is fully distributed with through holes 30, and a cavity chamber 29 communicated with the through holes 30 is arranged inside the bottom surface of the carbonization box 6; a liquid outlet pipe 27 communicated with the hollow chamber 29 is arranged on the top surface of the inner side of the liquid storage tank 1;
the outer wall of the carbonization box 6 is provided with a nitrogen gas bottle 22 and a hot air dryer 23 which is communicated with the nitrogen gas bottle 22 and the cavity 29 through a gas conveying pipe 25 and an air conveying pipe 26 respectively, the hot air dryer 23 is used for heating the nitrogen gas in the nitrogen gas bottle 22 and conveying the nitrogen gas into the carbonization box to heat the graphite cathode material so as to carbonize the amorphous carbon precursor coated on the surface of the graphite cathode material, and the amorphous carbon precursor is isolated from the outside air because a large amount of nitrogen gas is filled into the carbonization box 6, so that the amorphous carbon precursor can be ensured to have a better carbonization effect; control valves 24 are respectively arranged on the air pipe 25, the air supply pipe 26 and the liquid outlet pipe 27, and the control valves 24 are used for controlling the on-off of the air pipe 25, the air supply pipe 26 and the liquid outlet pipe 27.
As an optional implementation mode, the outer wall of the liquid storage tank 1 is hinged with an access door 2, and the access door 2 is convenient for an access person to access the water pump and the solution filter 28 in the liquid storage tank 1;
the upper end of the air inlet pipe 5 extends into the carbonization box 6 from the upper surface of the box cover 11, so that the amorphous carbon precursor solution in the carbonization box 6 can be prevented from flowing into the air inlet pipe 5.
The lower end of the gas outlet pipe 4 extends into the bottom of the inner side of the liquid storage tank 1, and the design is carried out, so that the amorphous carbon precursor solution steam which is not liquefied in the condenser 3 can be dissolved in the amorphous carbon precursor solution in the liquid storage tank 1 and can not be directly discharged from the gas outlet pipe 10 along with the nitrogen (the lower end of the gas outlet pipe 4 extends into the bottom of the inner side of the liquid storage tank 1, so that the nitrogen and the amorphous carbon precursor solution steam can be introduced into the amorphous carbon precursor solution after leaving from the condenser 3), and the waste of the amorphous carbon precursor is effectively avoided.
The liquid inlet pipe 8 is communicated with the upper end of the inner wall of the carbonization box 6.
The lower end of the liquid outlet pipe 27 is provided with a solution filter 28, and the solution filter 28 is used for filtering the amorphous carbon precursor solution flowing into the liquid storage tank 1.
The blanking holes 16 are distributed in a central symmetry manner by taking the rotating motor 14 as a center, and the blanking holes 16 enable the sealing plate 15 to slightly rotate to open the feeding hopper 13 for blanking, so that the feeding hopper 13 can be opened and closed quickly.
A lithium ion battery negative pole carbonization method executes the following steps:
the method comprises the following steps: respectively adding the amorphous carbon precursor solution and the graphite cathode material to be carbonized into a liquid storage tank 1 and a feeding hopper 13, and then starting an infusion pump 7 and a rotating motor 14 to enable the amorphous carbon precursor solution and the graphite cathode material to respectively enter a carbonization tank 6 through a liquid inlet pipe 8 and a discharging hole 16;
step two: starting a stirring motor 12, mixing and stirring the amorphous carbon precursor solution and the graphite cathode material which enter the carbonization box 6, closing the infusion pump 7 when the graphite cathode material is fed and the amorphous carbon precursor solution just submerges the graphite cathode material, stopping continuously conveying the amorphous carbon precursor solution into the carbonization box 6, and simultaneously starting a rotating motor 14 to drive a sealing plate 15 to rotate so as to seal the lower end of the feeding hopper 13;
step three: after continuously stirring for a period of time, opening the control valve 24 on the liquid outlet pipe 27, putting all the amorphous carbon precursor solution in the carbonization tank 6 into the liquid storage tank 1, and then closing the control valve 24;
step four: opening control valves 24 on a gas pipe 25 and an air supply pipe 26, starting a hot air dryer 23, enabling nitrogen in a nitrogen bottle 22 to enter the hot air dryer 23 through the gas pipe 25 for heating, enabling the heated hot nitrogen to enter a cavity 29 through the air supply pipe 26 and flow out of a through hole 30 upwards to heat the graphite cathode material, enabling an amorphous carbon precursor solution on the surface of the graphite cathode material to be heated by the hot nitrogen and evaporated to form an amorphous carbon precursor coated on the surface of the graphite cathode material, and then carbonizing the amorphous carbon precursor coated on the surface of the graphite cathode material to form an amorphous carbon coated material along with continuous heating of the hot nitrogen; hot nitrogen flows through a large amount of graphite cathode materials above the sieve plate 31 from bottom to top in the carbonization box 6 and then enters the condenser 3 from the air inlet pipe 5 for cooling; the gas entering the condenser 3 contains evaporated amorphous carbon precursor solution steam in addition to hot nitrogen, after the mixed gas is cooled in the condenser 3, the temperature of the hot nitrogen is reduced, and the amorphous carbon precursor solution steam is liquefied into amorphous carbon precursor solution; the nitrogen and amorphous carbon precursor solution enter the liquid storage tank 1 through the air outlet pipe 4, and then the nitrogen is dried by the dryer 9 and then is discharged from the air outlet pipe 10.
As an optional implementation manner, in the process that the hot nitrogen gas heats the graphite cathode material in the carbonization tank 6 in the fourth step, the stirring motor 12 does not stop rotating, and thus the design ensures that the surface of the graphite cathode material can be uniformly coated with the amorphous carbon precursor solution.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. The utility model provides a lithium ion battery negative pole carbonizing apparatus, includes liquid reserve tank (1), its characterized in that: a condenser (3), a carbonization tank (6) and a dryer (9) communicated with the interior of the liquid storage tank (1) are fixedly arranged at the upper end of the liquid storage tank (1); an exhaust pipe (10) is arranged on the dryer (9); a display screen (20) and a processor (21) electrically connected with the display screen (20) are arranged on the side surface of the liquid storage tank (1); the upper end of the carbonization box (6) is detachably and hermetically connected with a box cover (11); the condenser (3) is respectively communicated with the interior of the carbonization tank (6) and the interior of the liquid storage tank (1) through an air inlet pipe (5) and an air outlet pipe (4); an infusion pump (7) is installed on the bottom of the inner tank of the liquid storage tank (1), and a liquid inlet pipe (8) communicated with the interior of the carbonization tank (6) is installed on the infusion pump (7);
a stirring motor (12), a feeding hopper (13) and a rotating motor (14) are fixedly arranged on the upper surface of the box cover (11), a stirring shaft (17) with the upper end fixedly connected with an output shaft of the stirring motor (12) and a sealing plate (15) tightly attached to the lower surface of the box cover (11) and fixedly connected with an output shaft at the lower end of the rotating motor (14) are arranged on the lower surface of the box cover (11) in a rolling manner, a discharging hole (16) communicated with the feeding hopper (13) is formed in the sealing plate (15), stirring paddles (18) are fully distributed on the side surface of the stirring shaft (17), a sieve plate (31) in rolling connection with the lower end of the stirring shaft (17) is fixedly arranged at the lower end of the inner wall of the carbonization box (6), and a temperature sensor (19) electrically connected with the processor (21) is arranged; through holes (30) are fully distributed on the bottom surface of the inner side of the carbonization box (6), and a cavity chamber (29) communicated with the through holes (30) is arranged inside the bottom surface of the carbonization box (6); a liquid outlet pipe (27) communicated with the hollow chamber (29) is arranged on the top surface of the inner side of the liquid storage tank (1);
a nitrogen bottle (22) and a hot air dryer (23) which is respectively communicated with the nitrogen bottle (22) and the hollow chamber (29) through a gas pipe (25) and an air supply pipe (26) are arranged on the outer wall of the carbonization box (6); the air delivery pipe (25), the air supply pipe (26) and the liquid outlet pipe (27) are all provided with control valves (24).
2. The lithium ion battery negative electrode carbonization device according to claim 1, characterized in that: an access door (2) is hinged to the outer wall of the liquid storage box (1).
3. The lithium ion battery negative electrode carbonization device according to claim 1, characterized in that: the upper end of the air inlet pipe (5) extends into the carbonization box (6) from the upper surface of the box cover (11).
4. The lithium ion battery negative electrode carbonization device according to claim 1, characterized in that: the lower end of the air outlet pipe (4) extends into the bottom of the inner side of the liquid storage tank (1).
5. The lithium ion battery negative electrode carbonization device according to claim 1, characterized in that: the liquid inlet pipe (8) is communicated with the upper end of the inner wall of the carbonization box (6).
6. The lithium ion battery negative electrode carbonization device according to claim 1, characterized in that: and a solution filter (28) is arranged at the lower end of the liquid outlet pipe (27).
7. The lithium ion battery negative electrode carbonization device according to claim 1, characterized in that: the number of the blanking holes (16) is multiple, and the blanking holes are distributed in a centrosymmetric manner by taking the rotating motor (14) as a center.
8. A lithium ion battery negative electrode carbonization method, characterized in that the following steps are performed using the lithium ion battery negative electrode carbonization apparatus according to any one of claims 1 to 7:
the method comprises the following steps: respectively adding the amorphous carbon precursor solution and the graphite cathode material to be carbonized into a liquid storage tank (1) and a feeding hopper (13), and then starting an infusion pump (7) and a rotating motor (14) to enable the amorphous carbon precursor solution and the graphite cathode material to respectively enter a carbonization tank (6) through a liquid inlet pipe (8) and a blanking hole (16);
step two: starting a stirring motor (12), mixing and stirring the amorphous carbon precursor solution and the graphite cathode material which enter the carbonization box (6), closing the infusion pump (7) when the graphite cathode material is fed and the amorphous carbon precursor solution just submerges the graphite cathode material, stopping continuously conveying the amorphous carbon precursor solution into the carbonization box (6), and simultaneously starting a rotating motor (14) to drive a sealing plate (15) to rotate so as to seal the lower end of the feeding hopper (13);
step three: after stirring for a period of time, opening a control valve (24) on a liquid outlet pipe (27), putting all the amorphous carbon precursor solution in the carbonization box (6) into the liquid storage box (1), and then closing the control valve (24);
step four: opening the control valve (24) on the gas pipe (25) and the blast pipe (26), starting the hot air dryer (23), enabling nitrogen in the nitrogen bottle (22) to enter the hot air dryer (23) through the gas pipe (25) for heating, enabling the heated hot nitrogen to enter the cavity chamber (29) through the blast pipe (26) and flow out of the through hole (30) upwards to heat the graphite cathode material, enabling the amorphous carbon precursor solution on the surface of the graphite cathode material to be heated by the hot nitrogen and evaporated to form an amorphous carbon precursor coated on the surface of the graphite cathode material, and then carbonizing the amorphous carbon precursor coated on the surface of the graphite cathode material to form an amorphous carbon coated material along with continuous heating of the hot nitrogen; hot nitrogen flows through a large amount of graphite cathode materials above the sieve plate (31) from bottom to top in the carbonization box (6) and then enters the condenser (3) from the air inlet pipe (5) for cooling; the gas entering the condenser (3) is provided with evaporated amorphous carbon precursor solution steam in addition to hot nitrogen to form mixed gas, the temperature of the hot nitrogen is reduced after the mixed gas is cooled in the condenser (3), and the amorphous carbon precursor solution steam is liquefied into amorphous carbon precursor solution; and the nitrogen and the amorphous carbon precursor solution enter the liquid storage tank (1) through an air outlet pipe (4), and then the nitrogen is dried by a dryer (9) and then is discharged from an exhaust pipe (10).
9. The carbonization method for the negative electrode of the lithium ion battery according to claim 8, characterized in that: in the fourth step, the stirring motor (12) does not stop rotating in the process that the hot nitrogen heats the graphite cathode material in the carbonization box (6).
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| JP2013251249A (en) * | 2012-06-01 | 2013-12-12 | Masaaki Yamada | Carbonized graphene positive electrode-negative electrode material for battery, and secondary battery including the same |
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