JP2021197239A - Method for manufacturing composite particles for electrode material and method for manufacturing electrode material - Google Patents

Abstract

To manufacture composite particles of silicon, etc. to be used for an electrode material such as lithium ion secondary battery's positive electrode material, negative electrode material or the like, and an electrode material arranged by use of such composite particles safely and efficiently.SOLUTION: A method for manufacturing an electrode material comprises: (1) a pulverizing step of pulverizing silicon together with a liquid dispersion medium in a wet manner into fine particles, thereby producing a dispersion material containing the fine particles of pulverized silicon and the dispersion medium; (2) a drying-and-compounding step of drying the dispersion material produced by the pulverizing step and in parallel, mixing the pulverized silicon and powdery silicon while stirring, thereby producing composite particles of them; and (3) a mixing-and-slurrying step of adding carbon black and a binder to the composite particles to make a slurry. The drying-and-compounding step and the mixing-and-slurrying step are performed in a common device. In the drying-and-compounding step, a compounding process is performed by heating while raising a temperature stepwise under a reduced pressure.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for producing composite particles used for an electrode material such as a positive electrode material and a negative electrode material for a lithium ion secondary battery and a method for producing an electrode material using the composite particles, and in particular, fine particles of a silicon-based material. The present invention relates to a composite particle containing the above and a technique for manufacturing an electrode material using the same.

The use of lithium-ion secondary batteries as a power source for electric vehicles and hybrid vehicles is expanding, and in recent years, submicron size (1 μm to 0.1 μm) and nano size (about 1 nm to 100 nm) electrode materials have been used. Many fine particles such as silicon, silicon oxide, alumina, and zirconia are used. Such an electrode material is produced by combining an electrode active material such as graphite, silicon, or lithium cobalt oxide with fine particles such as silicon or carbon black. At that time, since fine particles such as nano-sized silicon are very expensive, silicon or the like of several μs, which can be obtained at a relatively low price, is pulverized by a pulverizer and dried. It is compounded with the electrode active material in.

The compounding referred to here means a state in which substances having different particle sizes and compositions coexist, such as a state in which finely divided crushed silicon particles are attached to other particles. Due to this compounding, for example, the crushed silicon is surrounded by particles such that the crushed silicon surrounds powdered silicon having a larger particle size, or fine particles such as alumina, zirconia, and titania, which have a smaller particle size than the crushed silicon. Particles like that are produced. Then, it is clear that the particles of the substance A are completely covered with the particles of the other substance B or the fine particles of the substance A, and the particles of the substance A are surrounded by the fine particles. The thing is called a coating. In other words, coating is considered to be a composite in a narrow sense, and is treated as a concept included in the category of composite. Further, not only the state where the particles are attached to each other but also the state where a plurality of substances and particles having a particle size coexist in a uniform state is included in the compounding.

FIG. 4 is an explanatory diagram showing a conventional manufacturing process of a silicon-based electrode material, and shows a process of coating (compositing) finely divided crushed silicon with powdered silicon, graphite, or the like having a larger particle size. There is. As shown in FIG. 4, here, first, (1) silicon is crushed into fine particles. Next, (2) the crushed silicon is transferred to the drying step to be dried, and the crushed silicon is transferred to the compounding step. (3) In the compounding step, powdered silicon or the like is coated with pulverized silicon to generate composite particles, which are then transferred to the mixing / slurry step. (4) In the mixing / slurrying step, composite particles coated with silicon fine particles are mixed with a polyimide binder or the like to form a slurry. Then, (5) the slurryed electrode material is transferred to the coating process and applied to a copper foil, a high-strength copper foil, a nickel foil, a nickel-plated steel foil, or the like to form an electrode.

Japanese Unexamined Patent Publication No. 2014-114330 Japanese Unexamined Patent Publication No. 2018-28037 Japanese Unexamined Patent Publication No. 2013-93140

However, in the manufacturing process of the electrode material as described above, it is necessary to transport the electrode material to the next process after the processing in each process, which requires labor and time, and also requires production adjustment between each process, which is controlled. Was also complicated. In addition, it is necessary to dry the silicon fine particles before the compounding treatment such as coating, and if the silicon is crushed and then dried, there is a risk of heat generation and ignition due to the oxidation reaction, which is difficult to handle and has specialized knowledge. Skill is required. In particular, when transporting dried silicon fine particles to the composite step, there is a problem that the transport work requires the utmost care and becomes a bottleneck in the manufacturing process.

An object of the present invention is to enable safe and efficient production of composite particles such as silicon used for electrode materials such as positive electrode materials and negative electrode materials of lithium ion secondary batteries and electrode materials using the composite particles. It is in.

The method for producing an electrode material of the present invention includes a pulverization step of wet pulverizing silicon together with a liquid dispersion medium into fine particles to form a dispersion containing the pulverized silicon and the dispersion medium, and the pulverization step. While drying the dispersion produced in the above, the crushed silicon and the electrode active material having a larger particle size are stirred and mixed, and the crushed silicon and the electrode active material are composited to obtain the crushed silicon. It is characterized by having a drying and compounding step of producing composite particles of the electrode active material.

In the present invention, a crushing step of wet crushing silicon together with a dispersion medium to produce a dispersion containing crushed silicon and a composite of crushed silicon and an electrode active material while drying the dispersion containing crushed silicon. A drying and compounding step of producing a composite particle of both is carried out. As a result, first, it is possible to shift to the composite treatment without transporting the dried silicon fine particles, and it is possible to avoid transporting the silicon powder in a dangerous dry state. In addition, drying and compounding are carried out in parallel to improve the efficiency of processing and shorten the processing time.

In the method for producing composite particles for an electrode material, the dispersion and the electrode active material may be stirred and mixed under heating and reduced pressure in the drying and compounding steps to perform the compounding process. good. In this case, in the drying and compounding steps, the temperature of the dispersion and the electrode active material may be gradually increased, for example, from 80 ° C. to 100 ° C. to 120 ° C. every 10 minutes. good. Further, the drying and compounding steps may be carried out in one device.

Further, in the pulverization step, alcohol may be used as the dispersion medium, or the pulverization step may be performed by an annular gap type wet pulverizer to make the silicon and the dispersion medium into fine particles.

On the other hand, the method for producing an electrode material of the present invention is characterized in that the composite particles produced by the above-mentioned production method are used, and a mixing / slurry step of adding a binder to the composite particles to form a slurry is carried out.

In the method for producing an electrode material, carbon black may be further added to the mixing / slurrying step. Further, the drying and compounding steps and the mixing / slurrying steps may be carried out in the same apparatus. Further, the drying and compounding step and the mixing / slurrying step may be carried out by a stirring mixer having a scraper, a chopper, and a swirl flow generation blade.

According to the method for producing composite particles for an electrode material of the present invention, a crushing step of wet crushing silicon together with a dispersion medium to produce a dispersion containing crushed silicon, and a crushing step of drying the dispersion containing crushed silicon while crushing silicon. Since the drying and compounding steps of combining the and electrode active materials to generate composite particles of both are provided, the compounding process can be carried out without transporting the dried silicon fine particles, and silicon in a dangerous dry state can be carried out. It is possible to avoid the transfer of powder. Therefore, the transport work becomes easy, and the safety and the work efficiency can be improved. In addition, drying and compounding can be performed in parallel, and processing efficiency can be improved and processing time can be shortened.

Further, in the method for producing an electrode material, the composite particles are further provided with a mixing / slurry step of adding a binder to the composite particles produced by the method for producing composite particles for an electrode material according to the present invention. It is also possible to carry out the mixing / slurrying step without going through the transporting step following the generation of the above. Therefore, for example, the drying and compounding steps and the mixing / slurrying steps can be performed in the same apparatus, and the processing efficiency can be improved and the processing time can be shortened.

It is explanatory drawing which shows the composite particle for an electrode material which is one Embodiment of this invention, and the processing process of the electrode material using it. It is explanatory drawing which shows an example of the wet bead mill apparatus which carries out the pulverization process in this invention. It is explanatory drawing which shows an example of the high-speed stirring mixer which carries out a drying + compounding process, a mixing / slurry process in this invention. It is explanatory drawing which shows the processing process in the manufacturing method of the conventional electrode material.

Hereinafter, embodiments of the present invention will be described. FIG. 1 is an explanatory diagram showing a composite particle for an electrode material and a processing process of an electrode material using the composite particle for an electrode material, which is an embodiment of the present invention. Here, a process of producing composite particles in which fine particles of silicon (hereinafter, appropriately referred to as crushed silicon) and silicon particles having a larger particle size are composited and using the composite particles to manufacture a silicon-based negative electrode material is performed. Let's take an example. In this embodiment, silicon particles of about 1 to 10 μm are wet-ground into submicron-sized or nano-sized fine particles, and the particles are combined with powdered silicon (about 1 to 30 μm) while being dried in one device to form silicon. Manufacture composite particles. This eliminates the transport of dangerous silicon fine particles while using a relatively inexpensive silicon material, and safely and efficiently manufactures an electrode material such as a lithium ion secondary battery.

As shown in FIG. 1, the manufacturing method comprises (1) pulverization step, (2) drying + compounding step (drying and compounding step), (3) mixing / slurrying step, and (2), (3). ) Is continuously processed in the same apparatus. Then, the electrode material produced and slurryed by the steps (1) to (3) is sent to the (4) coating process to manufacture the electrode. In this case, unlike the process of FIG. 4, the transfer of the processed material is only (1) → (2) in the slurry manufacturing process, the transfer process is significantly reduced, and the dry state is achieved in the process. The crushed silicon is not transported. Hereinafter, the processing in each step will be described step by step.

(1) Crushing step In the crushing step, silicon particles of about 1 to 10 μm are wet-ground to a submicron size or nano size. For example, using ethanol as a medium (dispersion medium), silicon particles of about 2.7 μm are pulverized to about 0.5 μm. At that time, for crushing the silicon particles, for example, a wet crusher as shown in FIG. 2 (bead mill: "Aqua Turbo" (trade name) manufactured by Freund Turbo Co., Ltd.) is used. In the inventor's experiment, 1500 g of silicon particles and 1500 g of ethanol were treated with the apparatus of FIG. 2 (Aqua Turbo TZ-05 type) at a rotor rotation speed of about 2000 rpm and a crushing time of 60 minutes to 2.7 μm (D50: median). From the silicon particles of (diameter), a dispersion containing 0.5 μm (same) of pulverized silicon could be produced.

The wet bead mill device 1 of FIG. 2 has an annular gap type structure in which a rotor 3 is rotatably arranged in a stator 2, and the rotor 3 is rotationally driven by a motor (not shown). An annular crushing chamber (crushing zone) 4 is formed between the rotor 3 and the stator 2. Spherical beads 5 are housed in the crushing chamber 4. As the spherical beads 5, for example, fine beads having a diameter of 1 to 0.1 mm made of a material such as steel balls, ceramics, and glass are used. The required amount (for example, about 50 to 100% of the volume of the crushing chamber) of the spherical beads 5 from the bead input port 6 provided on the front side (left side in the figure) of the stator 2 is inside the crushing chamber 4 before the start of operation. Is charged and filled. A raw material supply pipe 7 communicating with the crushing chamber 4 is attached to the right end side of the stator 2 in the drawing. On the left end side of the crushing chamber 4 in the figure, a pyramid screen 8 for separating the medium beads and the liquid raw material and a product discharge pipe 9 for discharging the dispersed and finely pulverized liquid raw material are provided.

In the wet bead mill device 1, spherical beads 5 are placed in the crushing chamber 4, and the medium (ethanol, NMP, etc.) and silicon powder are charged into the crushing chamber 4 from the raw material supply pipe 7 while the rotor 3 is rotationally driven. Spherical beads 5 hit the silicon powder in the crushing chamber 4, are finely pulverized by the impact force and shear stress, are separated from the spherical beads 5 by the pyramid screen 8, and are discharged from the product discharge pipe 9. This process is repeated once or a plurality of times to produce a slurry-like dispersion containing silicon fine particles having a desired pulverized particle size (submicron to nanometer). The silicon that has been made into fine particles in the pulverization step is transferred to an apparatus that carries out the next "drying + compounding step".

In this case, in the production method, the pulverized silicon is immersed in a medium solution such as ethanol and is in a stable state. Therefore, it is possible to convey finely divided silicon in a safe state for the next process. As described above, the dried silicon fine particles have a risk of ignition and the like, and it is difficult to disperse them in the liquid after drying. In that respect, in the production method according to the present invention, since silicon fine particles can be generated while immersed in alcohol, it is not necessary to transport the dry silicon powder to another place, and the risk of work is reduced. , Work efficiency and work environment can be improved.

(2) Drying + Composite Step Next, while the crushed silicon obtained in the crushing step is dried, it is composited with powdered silicon to produce silicon composite particles. As described above, in the manufacturing method, the “drying + compounding step” and the next (3) “mixing / slurry step” are continuously carried out in the same apparatus. Of the above steps, in the "drying + compounding step", the crushed silicon produced in the previous crushing step is dried and composited with powdered silicon. Further, in the next "mixing / slurrying step", this is mixed with carbon or the like, and further mixed and stirred with a polyimide binder to form a slurry. In the process according to the present invention, the processes (2) and (3) are carried out in one apparatus without going through a transfer step.

In the "drying + compounding step", the powdered silicon and the crushed silicon are dried and combined. That is, in the process, drying and compounding are processed in parallel and simultaneously. In this case, the crushed silicon is dried under heating and reduced pressure. For the "drying + compounding process" and the next "mixing / slurrying process", for example, a high-speed stirring mixer as shown in FIG. 3 (such as "Balance Gran" (trade name) manufactured by Freund Turbo Co., Ltd.) is used. .. In the experiment of the inventor, 600 g of powdered silicon and 160 g of crushed silicon were subjected to a treatment temperature of 80 ° C. to 120 ° C. and a reduced pressure of about −90 kPa (at an atmospheric pressure of 100 kPa, 90) by the apparatus of FIG. 3 (Balance Gran BG-2L type). % Reduced pressure), chopper rotation speed of about 2000 rpm, scraper rotation speed of about 30 rpm, and treatment time (drying time) of 30 minutes to obtain a good composite, and the process proceeded to the next "mixing / slurry step". In this case, the treatment temperature is increased stepwise every 10 minutes (80 ° C → 100 ° C → 120 ° C), and as a result of the drying treatment, the same temperature is maintained (for example, 120 ° C for 30 minutes). A better composite was obtained.

(3) Mixing / Slurry Step Following the “drying + compounding step”, in the process according to the present invention, the “mixing / slurry step” is continuously carried out with a high-speed stirring mixer as shown in FIG. Here, first, a conductive auxiliary agent such as carbon black is added to the silicon composite particles composited in the previous step and mixed, and then a polyimide binder (electrode forming binder) is added to form a slurry. In the experiment of the inventor, following the previous step, 40 g of carbon black was added to the composite silicon, and the mixing process was performed at a chopper rotation speed of about 500 rpm and a scraper rotation speed of about 30 rpm for about 3 minutes by the apparatus of FIG. gone. Then, 660 g of a polyimide binder was further added to this mixed product, and a slurrying treatment was performed at a chopper rotation speed of about 2000 rpm and a scraper rotation speed of about 30 rpm for about 5 minutes. As a result, a slurry product of a good silicon-based negative electrode material was obtained. The electrode material obtained by performing the processes (2) and (3) in the high-speed stirring mixer is transported to the electrode manufacturing department or manufacturing factory in order to perform the (4) coating process.

As shown in FIG. 3, the high-speed stirring / mixing machine 11 used as the high-speed stirring / mixing machine that carries out the “drying + compounding step” and the “mixing / slurry step” is to be treated with crushed silicon, powdered silicon, binder, or the like. The scraper 13, the chopper 14, and the swirl flow generation blade 15 are arranged coaxially in the vertical direction in the stirring tank 12 into which the material is charged. The chopper 14 and the swirl flow generation blade 15 are attached to the rotary shaft 16, and the rotary shaft 16 projects below the stirring tank 12 and is connected to the motor 17. Further, the scraper 13 is attached to a rotation drive unit 18 coaxially arranged with the rotation axis, and is driven by a motor 19 separately from the chopper 14.

In the high-speed stirring mixer 11, the rotary shaft 16 is rotated by operating the motor 17, and the chopper 14 and the swirl flow generation blade 15 attached to the rotating shaft 16 are rotated to stir the object to be processed in the stirring tank 12. Mix. On the other hand, by operating the motor 19, the rotation drive unit 18 rotates, and the scraper 13 attached to the rotation drive unit 18 rotates. In this case, the scraper 13, the chopper 14, and the swirl flow generation blade 15 are rotated in opposite directions, and the object to be processed in the stirring tank 12 is instantly stirred and mixed, and high mixing and dispersibility are exhibited.

The scraper 13 is arranged at the bottom of the stirring tank 12, and has a function of pushing the object to be processed in the stirring tank 12 toward the inner peripheral wall 12a by its rotation. The scraper 13 includes an arm portion 13a extending radially from the rotation drive portion 18 in a wing shape, and a scraping portion 13b provided at the tip end portion of the arm portion 13a. The arm portion 13a rotates in close contact with or in sliding contact with the bottom wall 12b of the stirring tank 12. The scraping portion 13b extends in the vertical direction along the inner peripheral wall 12a of the stirring tank 12, moves in close proximity or in contact with each other, and moves the object to be extruded outward by the arm portion 13a toward the center again. Scratch out.

The chopper 14 is provided above the scraper 13, and the sawtooth blade-shaped resistance member 14a formed in the vertical direction is rotated around the center of rotation to improve the dispersibility of the object to be processed. By providing such a chopper 14, a high mixing and dispersing function is exhibited in both powder and liquid (particularly highly viscous slurry). The swirl flow generation blade 15 is provided above the chopper 14 and generates a swirl flow in the central region of the stirring tank 12. The swirl flow generation blade 15 is formed of upward blades (blades having a substantially C-shaped vertical cross section) whose outer end region is bent upward, and here, four blades having high apex at 90 degree intervals. An upward blade equipped with is used. By providing the swirl flow generation blade 15, even when mixing powder electrode materials, in a state where a binder is added to increase the viscosity, and when water is sequentially added to generate a slurry. , It is possible to exert a good mixing / dispersing function.

Further, the stirring tank 12 of the high-speed stirring mixer 11 has a jacket structure, and the outside of the stirring tank 12 is covered with an outer cover 21. There is a gap 22 between the stirring tank 12 and the outer cover 21, and the temperature inside the stirring tank 12 can be appropriately adjusted by supplying a heat medium such as hot air or hot water from the heating device 23 to the gap 22. ing. Further, the stirring tank 12 has a closed structure, and the inside of the tank can be depressurized by a decompression device 24 such as a vacuum pump. With these jacket structures and closed structures, the high-speed stirring mixer 11 enables drying treatment of crushed silicon under reduced pressure and heating.

In such a high-speed stirring mixer 11, first, a composite of powdered silicon and crushed silicon produced in (1) crushing step is charged from the upper end of the stirring tank 12, and the crushed silicon is mixed while being dried. do. In this case, the stirring tank 12 is heated and depressurized by the heating device 23 and the depressurizing device 24, and in that state, the scraper 13, the chopper 14, and the swirl flow generation blade 15 are rotated. At that time, it is preferable that the scraper 13 is rotated so that the peripheral speed between the scraper 13 and the inner peripheral wall 12a is as high as 5 m / sec to 40 m / sec. Further, in the drying treatment, it is desirable to raise the temperature in the stirring tank 12 step by step as described above.

In this way, powdered silicon and crushed silicon are dried and mixed to form silicon composite particles, and then carbon black is put into a tank and mixed. Then, a polyimide binder is further added to make the whole slurry. As a result, the composite silicon and carbon in the stirring tank 12 are mixed, and the silicon fine particles and powdered silicon are precisely mixed to produce a composite slurry. Then, this is transferred to the coating process, and a desired electrode is manufactured.

As described above, in the method for producing an electrode material according to the present invention, silicon is made into fine particles (nano size, submicron size) by wet pulverization, so that the fine particles are dispersed in a medium such as alcohol. The crushed silicon can be transferred to the next process. As a result, the silicon fine particles can be transported in a liquid state, and the transfer of the silicon powder in a dangerous dry state can be avoided. Therefore, the transport work becomes easy, and the safety and the work efficiency can be improved.

In addition, the high-speed stirring and mixing machine can be used to dry the pulverized silicon and combine it with an electrode active material such as silicon particles (including coating and uniform coexistence) in one device. Therefore, it is possible to dry and combine the fine particle raw materials for electrodes in one step without going through a separate drying step, and further, it is possible to perform mixing and slurrying in the same device. The efficiency is improved, the processing time is shortened, and the transportation process in the middle is omitted. For example, slurry production by precision mixing, which took about 8 hours with a conventional planetary mixer, can be performed in about 40 minutes, and the processing time can be significantly shortened.

It goes without saying that the present invention is not limited to the above-described embodiment and can be variously modified without departing from the gist thereof.
For example, in the above embodiment, the composite particles formed by the combination of large and small silicon obtained by combining crushed silicon with silicon powder have been described, but the combination to which the present invention can be applied is not limited to the above, and graphite and silicon, or silicon. The present invention is applicable to various combinations of composite particles such as carbon black and carbon black and electrode materials using the same. That is, the electrode active material to be compounded may be graphite, lithium cobalt oxide, or the like in addition to silicon, and the fine particles for compounding may be silicon oxide, alumina, zirconia, etc. in addition to silicon. Fine particles of about 10 nm to 1 μm such as titania, silica, and lithium oxide may be used.

Further, the apparatus for carrying out the present invention is not limited to the above-mentioned bead mill apparatus 1 and the high-speed stirring mixer 11, and other powder or granular material processing apparatus is used as long as it is an apparatus capable of equivalent processing. It is also possible. Further, the above-mentioned various treatment conditions are an example as an embodiment, and the present invention is not limited to the above numerical values, and the object to be treated includes the rotation speed of the chopper or scraper, the heating temperature and its adjustment conditions, the reduced pressure amount, the treatment time, and the like. It can be changed as appropriate according to the physical properties, particle size, amount, etc. of the object. For example, the amount of reduced pressure is preferably adjusted in the range of about -60 to −90 kPa depending on the object to be treated.

The production method of the present invention can be applied not only to the production of electrode (positive electrode / negative electrode) materials for lithium ion secondary batteries, but also to the composite of fine particles used in photocatalysts, cosmetics, foods, and the like.

1 Wet bead mill device 2 Stator 3 Rotor 4 Crushing chamber 5 Spherical beads 6 Bead inlet 7 Raw material supply pipe 8 Pyramid screen 9 Product discharge pipe 11 High-speed stirring mixer 12 Stirring tank 12a Inner peripheral wall 12b Bottom wall 13 Scraper 13a Arm 13b Scraping Part 14 Chopper 14a Resistance member 15 Swirl flow generation blade 16 Rotating shaft 17 Motor 18 Rotating drive part 19 Motor 21 Outer cover 22 Void 23 Heating device 24 Decompression device

Claims (10)

A pulverization step in which silicon is wet-ground together with a liquid dispersion medium to make fine particles, and a dispersion containing the finely divided pulverized silicon and the dispersion medium is produced.
While drying the dispersion produced in the crushing step, the crushed silicon and the electrode active material having a larger particle size are stirred and mixed, and the crushed silicon and the electrode active material are composited to obtain the above. A method for producing composite particles for an electrode material, which comprises a drying and compounding step of producing composite particles of pulverized silicon and the electrode active material. In the method for producing composite particles for an electrode material according to claim 1.
A method for producing composite particles for an electrode material, which comprises heating and stirring and mixing the dispersion and the electrode active material under reduced pressure in the drying and compounding steps to perform the compounding process. In the method for producing composite particles for an electrode material according to claim 2.
A method for producing composite particles for an electrode material, which comprises gradually increasing the temperature of the dispersion and the electrode active material in the drying and compounding steps. The method for producing composite particles for an electrode material according to any one of claims 1 to 3.
A method for producing composite particles for an electrode material, which comprises carrying out the drying and compounding steps in one apparatus. The method for producing composite particles for an electrode material according to any one of claims 1 to 4.
A method for producing composite particles for an electrode material, which comprises using alcohol as the dispersion medium in the pulverization step. The method for producing composite particles for an electrode material according to any one of claims 1 to 5.
The pulverization step is a method for producing composite particles for an electrode material, characterized in that the silicon and the dispersion medium are pulverized by an annular gap type wet pulverizer. A method for producing an electrode material using composite particles according to the production method according to any one of claims 1 to 6.
A method for producing an electrode material, which comprises a mixing / slurrying step of adding a binder to the composite particles to form a slurry. In the method for manufacturing an electrode material according to claim 7,
A method for producing an electrode material, which comprises further adding carbon black in the mixing / slurrying step. The method for manufacturing an electrode material according to claim 7 or 8.
A method for producing an electrode material, which comprises carrying out the drying and compounding step and the mixing / slurrying step in the same apparatus. The method for manufacturing an electrode material according to any one of claims 7 to 9.
A method for producing an electrode material, wherein the drying and compounding step and the mixing / slurrying step are carried out by a stirring mixer having a scraper, a chopper, and a swirl flow generation blade.

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