Electrode paste producing apparatus and electrode paste producing method using the same

Abstract

To provide an electrode paste generation device and an electrode paste manufacturing method capable of reducing unevenness of a wetting degree of a solvent to powder when generating electrode paste by kneading the powder containing active material particles and the solvent by using a multi-shaft kneader.SOLUTION: An electrode paste producing apparatus 10 includes a multi-axial kneading machine 1 having an exterior body 11 and a plurality of rotary shafts 12 arranged in parallel and horizontally in a hollow portion 111 of the exterior body 11 and rotating in the same direction, and produces an electrode paste 62 to be applied to an electrode foil 61 of a battery 60 by kneading a powder HT and a solvent YB charged into the hollow portion while conveying the powder HT and the solvent YB in an axial direction by a spiral screw portion 121 and applying a shearing force to the powder by a paddle portion 122. The powder is charged into the hollow part from a powder charging port 112 formed in the outer package on the upstream side of the screw part, and the solvent is charged into the hollow part from a solvent charging port 113 formed in the outer package on the downstream side of the powder charging port in the form of a spray having an average particle diameter smaller than that of the powder.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The disclosed technology relates to an electrode paste producing device that kneads a powder containing active material particles with a solvent to produce an electrode paste to be applied to an electrode foil of a battery, and a method for producing an electrode paste using the device. [Background technology]

[0002] In general, when manufacturing a battery, an electrode body is produced by kneading a powder such as an active material with a solvent, and then coating the resulting electrode paste on an electrode foil. For example, Patent Document 1 discloses a technology in which, using a twin-screw kneader including an exterior body having a hollow portion and two rotating shafts arranged parallel and horizontally at a predetermined distance within the hollow portion of the exterior body and rotating in the same direction, powder containing active material particles, a conductive agent, a binder, etc. is conveyed in the axial direction by a helical screw portion fixed to the rotating shaft, while being kneaded while applying a shear force by a paddle portion fixed to the rotating shaft to produce a powder paste, and the powder paste and a solvent are kneaded in an appropriate kneader to produce an electrode paste.

[0003] However, in the technology disclosed in Patent Document 1, the solvent is added after a time interval has elapsed since the powder was added to the twin-screw kneader, which causes the powder to be insufficiently wetted with the solvent in the early stages of kneading, resulting in excessive shear force acting on the powder and making it prone to cracking or chipping of the active material particles.In response to this problem, for example, Patent Document 2 discloses a technology for a method of manufacturing an electrode paste, which includes a step of adding a powder of an active material or the like and a solvent to the screw section of a twin-screw kneader with a feeding offset of one second or less, and then sending the powder and solvent to the paddle section by the screw section and kneading them. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-224435 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-60704 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the twin-screw kneader, the solvent is introduced from the outer periphery of the barrel (exterior body) toward the screw section of the rotating shaft. Therefore, the solvent easily penetrates into the gaps between the powder particles on the outer periphery of the screw section among the powder particles being transported by the screw section, but the solvent does not easily penetrate into the gaps between the powder particles on the inner periphery of the screw section. Therefore, there is a tendency for the degree of wetting of the powder by the solvent to be uneven between the outer periphery and the inner periphery of the screw section. As a result, there remains a problem that excessive shear force acts on powder that is not sufficiently wetted with the solvent when kneaded in the paddle section, which is prone to causing damage to the active material particles.

[0006] The disclosed technology has been made in consideration of such problems, and has an object to provide an electrode paste generating device that can reduce unevenness in the degree of wetting of the solvent with respect to the powder that comes into contact with the paddle portions of each rotating shaft when a powder containing active material particles is mixed with a solvent using a multi-shaft kneader to generate an electrode paste, and a method for manufacturing an electrode paste using the device. [Means for solving the problem]

[0007] (1) One aspect of the disclosed technology for solving the above-described problems is an electrode paste generating device that includes an exterior body having a hollow portion, and a multi-shaft kneader having a plurality of rotating shafts that are arranged parallel and horizontally at a predetermined interval within the hollow portion and rotate in the same direction, and that kneads a powder containing active material particles for an electrode body and a solvent introduced into the hollow portion in the axial direction using a helical screw unit fixed to the rotating shaft, while applying a shear force to the powder using a paddle unit fixed to the rotating shaft, thereby generating an electrode paste to be applied to an electrode foil of a battery. The electrode paste generating device is configured so that the powder is introduced into the hollow portion through a powder inlet formed in the exterior body upstream of the screw unit, and the solvent is atomized downstream of the powder inlet to have an average particle size smaller than the average particle size of the powder, and is introduced into the hollow portion through a solvent inlet formed in the exterior body.

[0008] (2) In the electrode paste generating device described in (1), it is preferable that the solvent inlet is equipped with a discharge nozzle that discharges a solvent moving at an average speed faster than the average speed of movement of the powder.

[0009] (3) In the electrode paste generating device described in (2), it is preferable that the discharge nozzle discharges the solvent so that the average speed at which the solvent moves is equal to or greater than the average speed at which the powder moves multiplied by the ratio of the average particle size of the powder to the average particle size of the solvent.

[0010] (4) In the method for producing an electrode paste using the electrode paste producing device described in any one of (1) to (3), it is preferable to provide a kneading step of producing the electrode paste by kneading the powder and the solvent while feeding a required amount of the solvent into the solvent inlet, and a degassing step of degassing air bubbles remaining in the electrode paste produced in the kneading step. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a system overview diagram showing the overall configuration of an electrode paste production device according to one aspect of the present embodiment and a method for producing electrode paste using the device. [Figure 2] FIG. 2 is a schematic cross-sectional view of the multi-shaft kneader shown in FIG. 1, cut in the horizontal direction. [Figure 3] FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2, showing a schematic diagram illustrating a state in which powder is introduced. [Figure 4] FIG. 3 is a cross-sectional view taken along the line BB in FIG. 2, showing a schematic diagram of a solvent being introduced. [Figure 5] FIG. 2 is a schematic diagram of the solvent supply device shown in FIG. [Figure 6] FIG. 5 is a schematic enlarged view of a BB portion shown in FIG. [Figure 7] 3 is a cross-sectional view of CC shown in FIG. 2. [Figure 8]FIG. 3 is a cross-sectional view taken along the line DD in FIG. 2. DETAILED DESCRIPTION OF THE INVENTION

[0012] <Explanation of this electrode paste generating device> Next, an electrode paste production device according to one aspect of an embodiment of the disclosed technology (hereinafter referred to as "the electrode paste production device") will be described in detail with reference to the drawings.

[0013] Fig. 1 shows the overall configuration of an electrode paste production apparatus according to one aspect of this embodiment, and a system schematic diagram showing a method for producing electrode paste using the apparatus. Fig. 2 shows a schematic cross-sectional view taken horizontally of the multi-shaft kneader shown in Fig. 1. Here, the X direction indicates the axial direction of the rotation shafts in the multi-shaft kneader, the Y direction indicates the direction of separation between the rotation shafts in the multi-shaft kneader, and the Z direction indicates the vertical direction of the multi-shaft kneader.

[0014] As shown in FIG. 1 , this electrode paste production apparatus 10 includes a multi-shaft kneader 1 that kneads powder HT and solvent YB to produce electrode paste 62, a powder supply device 2 that supplies powder HT to the multi-shaft kneader 1, a solvent supply device 3 that supplies solvent YB to the multi-shaft kneader 1, a degassing device 4 that degasses remaining bubbles in the electrode paste 62 produced by the multi-shaft kneader 1, and a storage tank 5 that temporarily stores the electrode paste 62 degassed by the degassing device 4. The degassing device 4 is a known degassing device that uses a centrifugal separation mechanism or the like. The electrode paste 62 stored in the storage tank 5 is fed to a known coating device 6 and coated onto electrode foil 61, which is being transported at a predetermined speed, by a coating roller 6R or the like of the coating device 6. The electrode paste 62 is then dried, pressed, or the like to form an electrode body 63 of a battery 60.

[0015] More specifically, as shown in Figures 1 and 2, the electrode paste production device 10 includes a multi-shaft kneader 1 having an outer casing 11 having a hollow portion 111, and a plurality of rotating shafts 12 (12a, 12b) arranged parallel and horizontally at a predetermined interval d1 within the hollow portion 111 of the outer casing 11 and rotating in the same direction w. Furthermore, in this electrode paste production device 10, powder HT containing active material particles HT1 for an electrode body 63 and a solvent YB are introduced into the hollow portion 111 of the outer casing 11 and transported in the axial direction (X direction; transport direction P) by spiral screw portions 121 (121a, 121b, 121c, 121d) fixed to the rotating shafts 12 (12a, 12b), while applying shear force to the powder HT by paddle portions 122 (122a, 122b, 122c, 122d) fixed to the rotating shafts 12 (12a, 12b), thereby kneading the powder HT and the solvent YB to produce an electrode paste 62 to be applied to the electrode foil 61 of the battery 60. The spiral screw portions 121 fixed to adjacent rotating shafts 12 (12a, 12b) are formed to have the same shape and are formed so as to rotate without contacting each other and partially intersect each other.

[0016] Here, the multi-shaft kneader 1 will be described as an example of a twin-shaft kneader in which two rotating shafts 12 (12a, 12b) rotate in the same direction w, but this is not necessarily limited to this. For example, the multi-shaft kneader 1 may be one in which three or more rotating shafts 12 each rotate in the same direction.

[0017] FIG. 3 is a cross-sectional view taken along line AA in FIG. 2, showing a schematic diagram of the powder being introduced. FIG. 4 is a cross-sectional view taken along line BB in FIG. 2, showing a schematic diagram of the solvent being introduced. FIG. 5 is a schematic diagram of the solvent supply device shown in FIG. 1. FIG. 6 is a schematic enlarged view of the section BB in FIG. 4. As shown in FIGS. 2 to 6, in this electrode paste production device 10, the powder HT is introduced into the hollow portion 111 through a powder inlet 112 formed in the exterior body 11 on the upstream side of the screw portion 121. The solvent YB is atomized downstream of the powder inlet 112 to have an average particle size t2 smaller than the average particle size t1 of the powder HT, and introduced into the hollow portion 111 through a solvent inlet 113 formed in the exterior body 11. The average particle size t2 of the solvent YB is preferably equal to or smaller than 1 / 5 of the average particle size t1 of the powder HT, and more preferably approximately 1 / 10 of the average particle size t1 of the powder HT. The average particle size t1 of the powder HT and the average particle size t2 of the solvent YB may be measured on a number basis or a volume basis. The average particle size t1 of the powder HT and the average particle size t2 of the solvent YB can be measured, for example, by a laser diffraction method, an image processing method, or the like. The average velocity V1 of the powder HT and the average velocity V2 of the solvent YB can be measured, for example, by particle image velocimetry (PIV) using a laser beam.

[0018] Here, the powder inlet 112 is formed above the intermediate portion 12T between the screw portions 121 of adjacent rotating shafts 12, but this is not necessarily limited thereto, and for example, multiple inlets may be formed toward the screw portion 121 of each rotating shaft 12. Furthermore, while one solvent inlet 113 (113a, 113b) is formed above each rotating shaft 12 (12a, 12b), this is not necessarily limited thereto, and for example, one solvent inlet 113 may be formed diagonally above each rotating shaft 12 (12a, 12b), one solvent inlet 113 may be formed above and one solvent inlet 113 may be formed to the side of each rotating shaft 12 (12a, 12b), or one solvent inlet 113 may be formed above the intermediate portion 12T between the screw portions 121 of adjacent rotating shafts 12. Although the screw section 121 has the function of transporting the powder HT, it has almost no function of applying shear force to the powder HT. Therefore, it is preferable that the powder inlet 112 is formed on the upstream side of the screw section 121, and the solvent inlet 113 (113a, 113b) is formed on the downstream side of the screw section 121 at the boundary with the paddle section 122.

[0019] In this way, the powder HT is introduced into the hollow portion 111 from a powder inlet 112 formed in the exterior body 11 upstream of the screw portion 121, and the solvent YB is atomized downstream of the powder inlet 112 to have an average particle size t2 smaller than the average particle size t1 of the powder HT and introduced into the hollow portion 111 from a solvent inlet 113 formed in the exterior body 11. This allows droplets of the solvent YB to easily penetrate into the gaps between the powder HT being transported by the screw portions 121 (121a, 121b). Therefore, an appropriate amount of solvent YB (YBa, YBb) suitable for wetting the powder HT can be supplied not only to the powder HT present on the outer periphery of the screw portions 121 (121a, 121b), but also to the powder HT present on the inner periphery of the screw portions 121 (121a, 121b).

[0020] Therefore, when the multi-shaft kneader 1 is used to knead the powder HT containing the active material particles HT1 for the electrode body 63 with the solvent YB to produce the electrode paste 62, the degree of wetting of the powder HT with the solvent YB in contact with the paddle portions 122 (122a, 122b, 122c, 122d) of the rotating shafts 12 (12a, 12b) can be reduced. As a result, when the powder HT and the solvent YB are kneaded together, the powder HT is easily and uniformly wetted with the solvent YB, and an appropriate amount of shear force acts on the powder HT, making it less likely that damage to the active material particles HT1 will occur. Furthermore, because the powder HT is easily and uniformly wetted with the solvent YB, the time required to knead the powder HT and the solvent YB can be shortened, thereby increasing productivity.

[0021] Furthermore, since the screw portions 121 of each rotating shaft 12 rotate in the same direction w, the powder HT introduced from the powder inlet 112 may move more toward the screw portions 121a of some of the rotating shafts 12a, which may result in uneven distribution of the powder HT between the screw portions 121 (121a, 121b) of each rotating shaft 12 (12a, 12b) (see Figure 3).

[0022] However, for example, by injecting solvent YB into the hollow portion 111 from solvent inlets 113 (113a, 113b) formed in the outer casing 11 for each rotating shaft 12 (12a, 12b) near each rotating shaft 12 (12a, 12b) downstream of the powder inlet 112, it is possible to supply an appropriate amount of solvent YB (YBa, YBb) corresponding to the amount of powder HT (HTa, HTb) that is unevenly distributed in the screw portion 121 (121a, 121b) of each rotating shaft 12 (12a, 12b) (see Figure 4).

[0023] This makes it possible to further reduce unevenness in the degree of wetting of the solvent YB with respect to the powder HT that contacts the paddle portions 122 (122a, 122b, 122c, 122d) of each rotating shaft 12 (12a, 12b) when the multi-shaft kneader 1 is used to knead the powder HT containing the active material particles HT1 for the electrode body 63 with the solvent YB to produce the electrode paste 62. As a result, when the powder HT is kneaded with the solvent YB, the powder HT is more likely to be uniformly wetted with the solvent YB, and an appropriate amount of shear force acts on the powder HT, making it less likely that damage to the active material particles HT1 will occur.

[0024] 5, the solvent supply device 3 includes, for example, discharge nozzles 31 (31a, 31b), a solvent tank 32 that stores solvent YB, a solvent supply path 35 that supplies the solvent YB from the solvent tank 32 to the discharge nozzles 31 (31a, 31b), an air tank 33 that stores compressed air AK, an air supply path 36 that supplies the compressed air AK from the air tank 33 to the discharge nozzles 31 (31a, 31b), and a pressure adjustment valve 34 that adjustably applies air pressure from the air tank 33 to the solvent tank 32. The solvent supply path 35 includes a solvent supply pipe 351, a flow meter 352, a flow adjustment valve 353, an on-off valve 354, and a filter 355. The air supply path 36 includes an air supply pipe 361, a flow meter 362, an on-off valve 363, a flow adjustment valve 364, and a filter 365. Therefore, it is possible to supply appropriate amounts of solvent YB and compressed air AK at the required pressures to each discharge nozzle 31 (31a, 31b). The solvent YB and compressed air AK supplied to the discharge nozzles 31 (31a, 31b) then join at the nozzle tip and are discharged in the form of a spray. Therefore, each discharge nozzle 31 (31a, 31b) can adjust the amount of solvent YB discharged per unit time, the size of the solvent YB droplets (e.g., average particle size), the movement speed of the solvent YB droplets (e.g., average speed), etc.

[0025] As shown in FIGS. 4, 5, and 6, the solvent inlet 113 (113a, 113b) is preferably fitted with a discharge nozzle 31 (31a, 31b) that discharges the solvent YB moving at an average speed V2 that is faster than the average speed V1 of the powder HT. In this case, the droplets of the solvent YB moving at a faster speed discharged from the discharge nozzle 31 (31a, 31b) pass through the gaps in the powder HT moving at a slower speed, and the droplets of the solvent YB easily penetrate not only the gaps in the powder HT dispersed on the outer periphery of the screw section 121 but also the gaps in the powder HT dispersed on the inner periphery of the screw section 121. Furthermore, when the droplets of the solvent YB moving at a faster speed collide with the powder HT, they overcome the surface tension of the solvent YB and easily adhere to the powder HT. This allows the entire powder HT to be more uniformly wetted with the solvent YB. As a result, when the powder HT and the solvent YB are kneaded, excessive shearing force is less likely to act on the larger amount of powder HT, making it even more unlikely that defects or the like will occur in the active material particles HT1.

[0026] Furthermore, it is more preferable that the discharge nozzle 31 (31a, 31b) discharges the solvent YB so that the average speed V2 of the solvent YB is equal to or greater than the speed obtained by multiplying the average speed V1 of the powder HT by the ratio (t1 / t2) of the average particle size t1 of the powder HT to the average particle size t2 of the solvent YB (V2≧V1×t1 / t2). The powder HT moves generally in the axial direction (X direction) as the screw section 121 rotates, and the solvent YB is discharged from the discharge nozzle 31 and moves generally in a direction perpendicular to the axial direction. In this case, if the average speed V2 of the solvent YB is equal to or greater than the above speed (V2≧V1×t1 / t2), for example, the solvent YB with a particle size (t2) can pass through the smallest gap (the same gap as the particle size of the solvent YB) between powder HT with a particle size (t1) that can pass through without colliding with the powder HT. Therefore, the droplets of the solvent YB discharged from the discharge nozzles 31 (31a, 31b) can move a longer distance without colliding with the powder HT, and can be dispersed more uniformly in greater quantities into the gaps between the powder HT, thereby allowing the entire powder HT to be wetted more uniformly with the solvent YB.

[0027] <Electrode paste manufacturing method> The electrode paste generating apparatus 10 can be applied to both positive and negative electrode pastes 62, but here, an example of application to a positive electrode paste 62 will be described. For example, when generating an electrode paste 62 for a positive electrode of a lithium-ion secondary battery, the powder HT can include active material particles HT1 such as lithium cobalt oxide (LCO) or nickel-cobalt-lithium manganese oxide (NCM), conductive material HT2 such as acetylene black (AB) or carbon nanotubes (CNT), and binder HT3 such as polyvinylidene fluoride (PVdF). Furthermore, the solvent YB can be, for example, N-methylpyrrolidone (NMP).

[0028] When producing an electrode paste 62 for a positive electrode using this electrode paste production device 10, for example, as shown in Figure 3, a powder HT containing active material particles HT1 and a binder HT3 measured by a measuring device 21 of the powder supply device 2 is introduced into the hollow portion 111 through a powder inlet 112 formed in the outer casing 11, and, for example, as shown in Figure 4, a solvent YB dissolving a conductive agent HT2 is introduced into the hollow portion 111 through solvent inlets 113 (113a, 113b) formed in the outer casing 11 for each rotating shaft 12 (12a, 12b) near each rotating shaft 12 (12a, 12b) downstream of the powder inlet 112.

[0029] 2, resistance paddle portions 123 (123a, 123b), second paddle portions 122 (122c, 122d), second resistance paddle portions 123 (123c, 123d), and reverse screw portions 124 (124a, 124b) are fixed in this order to the rotary shaft 12 (12a, 12b) downstream of the paddle portions 122 (122a, 122b). FIG. 7 shows a cross-sectional view taken along line CC shown in FIG. 2. As shown in Figures 2 and 7, powder HT containing active material particles HT1 and binder HT3 and solvent YB in which conductive agent HT2 is dissolved are kneaded downstream of screw sections 121 (121a, 121b) by paddle sections 122 (122a, 122b) and second paddle sections 122 (122c, 122d) fixed to each rotating shaft 12 (12a, 12b).

[0030] That is, the paddle portions 122 (122a, 122b) and the second paddle portions 122 (122c, 122d) are composed of, for example, a plurality of approximately triangular plates with arc-shaped corners, and when rotating together with each rotation shaft 12 (12a, 12b), the powder HT is compressed in the gaps d2 between the paddle portions 122 (122a, 122b, 122c, 122d) and in the gaps d3 between the paddle portions 122 (122a, 122b, 122c, 122d) and the arc-shaped inner wall of the hollow portion 111, and the powder HT and the solvent YB are kneaded while applying shear force to the powder HT.

[0031] Moreover, Fig. 8 shows a DD cross-sectional view shown in Fig. 2. As shown in Fig. 2 and Fig. 8, the resistance paddle portions 123 (123a, 123b) and the second resistance paddle portions 123 (123c, 123d) located behind the paddle portions 122 (122a, 122b) and the second paddle portions 122 (122c, 122d) are composed of a plurality of large-diameter circular plates and small-diameter circular plates. The electrode paste 62, whose viscosity has been reduced by mixing the powder HT and the solvent YB in the paddle portions 122 (122a, 122b) and the second paddle portions 122 (122c, 122d), is transported downstream by the extrusion force from the powder HT transported via the screw portions 121 (121a, 121b), passing through gaps d4 between the resistance paddle portions 123 (123a, 123b) and the second resistance paddle portions 123 (123c, 123d) and gaps d5, d6 between the resistance paddle portions 123 (123a, 123b) and the second resistance paddle portions 123 (123c, 123d) and the arc-shaped inner wall of the hollow portion 111. Then, the electrode paste 62 is pushed back by the inverted screw portions 124 (124a, 124b) and transported from the discharge port 114 formed below the exterior body 11 through the discharge pipe 115 to the storage tank 5.

[0032] As described above, the method for producing an electrode paste using the present electrode paste generating apparatus 10 is a method for producing an electrode paste that includes a kneading process S1 in which a required amount of solvent YB is fed into the solvent inlet 113 (113a, 113b) of the multi-shaft kneader 1 while kneading the powder HT and the solvent YB, and a degassing process S2 in which air bubbles remaining in the electrode paste 62 kneaded in the kneading process S1 are degassed, as shown in Figures 1 to 8.

[0033] In this case, it is possible to promote uniform wetting of the powder HT with the solvent YB, thereby reducing defects in the active material particles HT1 and producing a high-quality electrode paste 62 with fewer bubbles that would cause defects when applied to the electrode foil 61. Furthermore, since the bubbles that are generated in the electrode paste 62 in the kneading step S1 can be reduced in the degassing step S2, the kneading time in the kneading step S1 can be shortened, thereby increasing the productivity of the electrode paste 62.

[0034] <Modification> The present embodiment described in detail above is merely an example and does not limit the disclosed technology in any way. Therefore, the disclosed technology can be improved and modified in various ways without departing from the spirit and scope of the present invention. [Explanation of symbols]

[0035] 1 Multi-shaft kneading machine 10 Electrode paste generator 11 Exterior body 12, 12a, 12b Rotation axis 31, 31a, 31b discharge nozzle 60 batteries 61 Electrode foil 62 Electrode Paste 63 Electrode body 111 Hollow part 112 Powder inlet 113, 113a, 113b Solvent inlet 121 Screw part 122 Paddle section HT powder HT1 active material particles S1 Kneading process S2 Defoaming process YB solvent

Claims

1. A multi-shaft kneader is provided, the multi-shaft kneader having an exterior body having a hollow portion, and a plurality of rotary shafts arranged in parallel and horizontally at predetermined intervals within the hollow portion and rotating in the same direction, a powder containing active material particles for an electrode body and a solvent introduced into the hollow portion are conveyed in an axial direction by a helical screw portion fixed to the rotating shaft, and a paddle portion fixed to the rotating shaft is applied with a shear force to the powder, thereby kneading the powder and the solvent to produce an electrode paste to be applied to an electrode foil of a battery, The powder is introduced into the hollow portion through a powder introduction port formed in the outer casing on the upstream side of the screw portion, The solvent is atomized downstream of the powder inlet into a spray having an average particle size smaller than the average particle size of the powder, and is then injected into the hollow portion through a solvent inlet formed in the exterior body. Electrode paste generator.

2. 2. The electrode paste producing device according to claim 1, The solvent inlet is fitted with a discharge nozzle for discharging the solvent, which moves at an average speed faster than the average speed at which the powder moves. Electrode paste generator.

3. 3. The electrode paste producing device according to claim 2, The discharge nozzle discharges the solvent so that the average speed at which the solvent moves is equal to or greater than the average speed at which the powder moves multiplied by the ratio of the average particle size of the powder to the average particle size of the solvent. Electrode paste generator.

4. A method for producing an electrode paste using the electrode paste producing device according to any one of claims 1 to 3, a kneading step of kneading the powder and the solvent while feeding a required amount of the solvent into the solvent inlet to produce the electrode paste; a degassing step of removing bubbles remaining in the electrode paste generated in the kneading step. A method for manufacturing electrode paste.

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