Ultrasonic dispersing device and slurry extrusion apparatus comprising the same

Abstract

This disclosure relates to an ultrasonic dispersion device and a slurry extrusion apparatus including the ultrasonic dispersion device. The ultrasonic dispersion device in the slurry extrusion apparatus includes: an ultrasonic probe in the outlet of the slurry extrusion apparatus, the ultrasonic probe being configured to irradiate the slurry in the slurry extrusion apparatus with ultrasonic waves; and a controller configured to control the ultrasonic irradiation by the ultrasonic probe.

Description

Cross-reference to related applications

[0001] This application claims priority and benefit to Korean Patent Application No. 10-2024-0190401, filed on December 18, 2024, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference. Technical Field

[0002] This disclosure relates to an ultrasonic dispersion device and a slurry extrusion apparatus including the ultrasonic dispersion device, and more specifically to an ultrasonic dispersion device for irradiating slurry in an extruder with ultrasonic waves and a slurry extrusion apparatus including the ultrasonic dispersion device. Background Technology

[0003] Unlike primary batteries, which are not designed for (re)charging, secondary batteries are designed for discharging and recharging. Low-capacity secondary batteries can be used in small portable electronic devices such as smartphones, feature phones, laptops, digital cameras, and camcorders, while high-capacity secondary batteries can be used as a power source for driving motors (such as motors in hybrid or electric vehicles) and for energy storage.

[0004] A method for manufacturing such a secondary battery may include applying an electrode slurry (consisting of an electrode active material, a conductive material, a binder, and a solvent for dissolving the binder) onto a current collector and drying it. The electrode slurry can be produced by physically and uniformly dispersing and mixing a liquid-powder mixture of materials including the electrode active material, conductive material, binder, solvent, etc., to produce a slurry mixture having flowability and viscosity suitable for coating while possessing material properties suitable for use as a battery electrode.

[0005] A slurry mixing device, called a slurry mixer, can be used to mix the above-mentioned materials to produce a slurry mixture. For example, a twin-screw extruder can be used as a slurry mixer. Compared to other slurry mixers, twin-screw extruders are suitable for mixing solid slurries or for mixing for high productivity purposes because they can apply strong and rapid shear forces to the mixed materials.

[0006] The information disclosed above in this background section is intended to enhance the understanding of the background of this disclosure, and therefore may contain information that does not constitute related (or prior art). Summary of the Invention

[0007] According to one aspect of this disclosure, an ultrasonic dispersion device is provided for use in a slurry extrusion apparatus. The ultrasonic dispersion device includes: a plurality of ultrasonic probes configured to irradiate slurry introduced into the slurry extrusion apparatus with ultrasonic waves; and a control unit configured to control the ultrasonic irradiation of the ultrasonic probes, wherein the ultrasonic probes are positioned at an upper outlet or a parallel outlet of the slurry extrusion apparatus.

[0008] Multiple ultrasonic probes can be arranged in a zigzag pattern at regular intervals along the movement path of the slurry on the side of the outlet, and when viewed in the direction of extension of the outlet, they can be arranged at regular intervals or angles.

[0009] Multiple ultrasonic probes may include a first ultrasonic probe provided on the side of the outlet and a second ultrasonic probe provided on the column of the outlet.

[0010] When viewed in a direction perpendicular to the extension direction of the outlet, the first and second ultrasonic probes can be arranged in a zigzag pattern at regular intervals along the movement path of the slurry so as not to overlap each other, and when viewed in the extension direction of the outlet, the first and second ultrasonic probes can be arranged in a zigzag pattern at regular intervals or angles so as not to overlap each other.

[0011] The ultrasonic dispersion device may further include a drive unit, the driver being configured to rotate the outlet side and the outlet column, and the controller being able to control the driver to rotate at least one of the outlet side and the outlet column.

[0012] The ultrasonic dispersion device may further include a sensor unit configured to measure slurry state information including at least one of temperature, pressure, density, viscosity, uniformity, flow rate, and flow velocity of the slurry, and the control unit may use the slurry state information to set whether to rotate at least one of the outlet side and the outlet column, the direction of rotation, and the rotation speed of at least one of them.

[0013] The ultrasonic dispersion device may further include a sensor unit configured to measure slurry state information including at least one of temperature, pressure, density, viscosity, uniformity, flow rate, and flow velocity of the slurry, and the control unit may use the slurry state information to set irradiation conditions including at least one of time, interval, and intensity of ultrasonic irradiation by an ultrasonic probe.

[0014] The ultrasonic probe can be a ceramic ultrasonic probe.

[0015] The ultrasonic dispersion device may further include a coolant supply unit configured to supply cooling water to the ultrasonic probe.

[0016] The ultrasonic dispersion device can have a center that is aligned with the center of the screw in the slurry extrusion equipment. Attached Figure Description

[0017] The features will become apparent to those skilled in the art from the detailed description of the exemplary embodiments with reference to the accompanying drawings, in which:

[0018] Figure 1 This is a view illustrating a slurry extrusion apparatus according to an embodiment of the present disclosure;

[0019] Figure 2 This is a view illustrating a slurry extrusion apparatus according to another embodiment of the present disclosure;

[0020] Figure 3A and Figure 3B This is a diagram used to explain the slurry dispersion method using ultrasound according to embodiments of the present disclosure;

[0021] Figure 4 This is a block diagram illustrating an ultrasonic dispersion apparatus according to an embodiment of the present disclosure;

[0022] Figure 5A and Figure 5B This is a view illustrating an ultrasonic dispersion apparatus according to an embodiment of the present disclosure;

[0023] Figure 6A and Figure 6B This is a view illustrating an ultrasonic dispersion apparatus according to another embodiment of the present disclosure;

[0024] Figure 7A and Figure 7B This is a view illustrating an ultrasonic dispersion apparatus according to yet another embodiment of the present disclosure; and

[0025] Figure 8 This is a flowchart illustrating a method for driving a slurry extrusion apparatus according to an embodiment of the present disclosure. Detailed Implementation

[0026] Exemplary embodiments will now be described more fully below with reference to the accompanying drawings; however, they may be implemented in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey exemplary implementation methods to those skilled in the art.

[0027] In the drawings, the dimensions of layers and regions may be exaggerated for clarity of illustration. It will also be understood that when a layer or element is referred to as "on" another layer or substrate, it may be directly on the other layer or substrate, or there may be intervening layers. Furthermore, it will be understood that when a layer is referred to as "between" two layers, it may be the only layer between those two layers, or there may be one or more intervening layers. The same reference numerals always denote the same elements.

[0028] It will be further understood that the terms “comprising” and / or “including” as used herein specify the presence of the stated features, integers, steps, operations, elements, components and / or groups thereof, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0029] Referring to two compared elements, features, etc., as “identical” means that they are “substantially the same.” Therefore, the phrase “substantially the same” can include what is considered a low deviation in the art, for example, 5% or less. The uniformity of any parameter over a given region can mean that it is uniform from an average perspective.

[0030] Although terms such as “first” and / or “second” are used to describe various components, these components are of course not limited by these terms. These terms are only used to distinguish one component from another. Therefore, unless explicitly stated to the contrary, a first component may be referred to as a second component without departing from the teachings of the exemplary embodiments.

[0031] Throughout this specification, unless otherwise stated, each element may be singular or plural.

[0032] Arranging any component "above (or below)" or "on (or below)" a component can mean that any component is positioned to contact the upper (or lower) surface of the component, and that other components may be located between the component and any components positioned on (or below) the component.

[0033] It will be understood that when a component is referred to as “connected,” “joined,” or “joined” to another component, it can not only be directly “connected,” “joined,” or “joined” to the other component, but it can also be indirectly “connected,” “joined,” or “joined” to the other component with other elements in between.

[0034] As used herein, the term “and / or” includes any one and all combinations of one or more of the associated listed items. When describing embodiments of this disclosure, the use of “may” refers to “one or more embodiments of this disclosure.” Expressions such as “at least one of…” and “one or more of…” modify the entire list of elements when following it, and not individual elements within that list.

[0035] Throughout this specification, unless otherwise stated, when “A and / or B” is stated, it means A, B, or A and B. Furthermore, unless explicitly stated to the contrary, when “C~D” is stated, it means C and above and D and below.

[0036] When phrases such as “at least one of A, B and C”, “at least one of A, B or C”, “at least one selected from the group of A, B and C” or “at least one selected from A, B and C” are used to indicate a list of elements A, B and C, the phrase can refer to any one and all suitable combinations.

[0037] The term “use” may be considered synonymous with the term “utilization”. As used herein, the terms “substantially,” “about,” and similar terms are used as approximate terms rather than as terms of degree, and are intended to describe the inherent variations in measured or calculated values ​​that would be recognized by one of ordinary skill in the art.

[0038] It should be understood that although the terms first, second, third, etc., may be used herein to describe various elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms are used to distinguish one element, component, region, layer, or segment from another element, component, region, layer, or segment. Accordingly, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment.

[0039] To facilitate interpretation in describing the relationship between one element or feature as shown in the accompanying drawings and another element or feature, spatially relative terms such as “below,” “under,” “down,” “above,” and “above” are used herein. It will be understood that these spatially relative terms are intended to cover different orientations of the device in use or operation other than those depicted in the drawings. For example, if the device in the drawings is flipped, any element described as “below” or “under” another element will be oriented as “above” or “above” another element. Thus, the term “below” can encompass both upward and downward directions.

[0040] The terminology used herein is for the purpose of describing embodiments of this disclosure and is not intended to limit this disclosure.

[0041] A comparative slurry extrusion apparatus may include an inlet, a barrel, a twin-screw extruder, and an outlet. The inlet is the entrance through which slurry material is introduced; the barrel is the area through which the slurry material moves; the twin-screw extruder comprises two screws (e.g., composed of two screws) to apply mechanical shear forces to the slurry material through screw rotation to mix, shear, and knead the slurry material; and the outlet is the outlet through which the slurry material mixed, sheared, and kneaded by the twin-screw extruder is extruded and discharged. The twin-screws in a comparative slurry extrusion apparatus can have different types and arrangements, which determines the physical properties and dispersibility of the produced slurry.

[0042] For example, in a comparative slurry extrusion unit, twin screws can be arranged in a kneading, reverse kneading, or reverse configuration, and the actions of slurry movement, melting, and pumping can be determined depending on the arrangement and type of each screw. Compared to other slurry mixers, this twin screw is suitable for mixing solid slurries or for mixing for high productivity purposes because it can apply strong and rapid shear forces to the slurry material.

[0043] However, due to the very short residence time of the slurry in the equipment, slurry quality control in such equipment can be limited. Although additional processes for dispersing and homogenizing the slurry can be added after slurry discharge, these additional processes may diminish the advantages of continuous processes within the equipment.

[0044] In contrast, the slurry extrusion apparatus 100 according to this disclosure can be configured to control the physical properties, dispersibility, and uniformity of the slurry by utilizing the vibrational energy and dynamic function of cavitation bubbles generated when an aqueous solution is irradiated with ultrasound. For this purpose, the slurry extrusion apparatus 100 of this disclosure can be configured to have multiple ultrasonic dispersion zones therein.

[0045] The slurry extrusion apparatus 100 disclosed herein can be configured to control the physical properties, dispersibility, and uniformity of the slurry by repeatedly exposing the slurry to ultrasonic waves (which are regular and intense stimuli) in multiple ultrasonic dispersion zones for a short period of time.

[0046] Compared to existing mechanical slurry mixers, the slurry extrusion apparatus 100 of this disclosure can use ultrasonic mixing of slurry to allow for uniform mixing and homogenization of slurry, and can also be used in degassing processes to keep slurry in a stable phase for extended periods.

[0047] The slurry extrusion apparatus 100 disclosed herein can control the particle size and distribution of the slurry by maximizing cavitation of the slurry using ultrasound, thereby ensuring the physical properties of the slurry optimized for the process after slurry discharge.

[0048] Figure 1 This is a view illustrating a slurry extrusion apparatus 100 according to an embodiment of the present disclosure.

[0049] refer to Figure 1 The slurry extrusion apparatus 100 according to embodiments of the present disclosure may include an inlet 11, a cylinder 12, a twin-screw extruder 13, an outlet 14, and an ultrasonic dispersion device 200 configured to form multiple ultrasonic dispersion zones. For example, as Figure 1 As shown, inlet 11 can be an inlet for introducing slurry material into cylinder 12, and outlet 14 can be an outlet for extruding and / or discharging slurry material from cylinder 12 (e.g., inlet 11 and outlet 14 can be at opposite ends of cylinder 12). For example, as Figure 1 As shown, the twin screws 13 may extend parallel to each other and along the longitudinal direction of the cylinder 12 inside the cylinder 12 to mix, shear and knead the slurry material introduced into the cylinder 12 (e.g., the twin screws 13 may be parallel to the longitudinal sidewall of the cylinder 12).

[0050] The ultrasonic dispersion device 200 may be located at the outlet 14 (e.g., internally). The ultrasonic dispersion device 200 may include a probe configured at the outlet 14 to irradiate the slurry with ultrasonic waves, and the probe may be controlled to irradiate the slurry with ultrasonic waves.

[0051] In detail, the ultrasonic dispersion device 200 can generate cavitation bubbles in the slurry by irradiating it with ultrasonic waves. The ultrasonic dispersion device 200 can be configured to control the physical properties, dispersibility, and uniformity of the slurry by utilizing the vibrational energy and dynamic function generated by the cavitation bubbles.

[0052] The ultrasonic dispersion device 200 can be provided at the outlet 14 of the slurry extrusion apparatus 100 (e.g., located inside the outlet 14). The ultrasonic dispersion device 200 can be fixed to the outlet 14 as a component of the slurry extrusion apparatus 100, or it can be detachably attached to the outlet 14 of the slurry extrusion apparatus 100 as a separate device. (See reference...) Figure 4 The configuration and function of the ultrasonic dispersion device 200 are described in detail in the accompanying drawings and other figures.

[0053] For example, refer to Figure 1 The ultrasonic dispersion device 200 can be provided at the upper outlet 14 of the slurry extrusion equipment 100. For example, refer to Figure 1 The slurry extrusion apparatus 100 can be configured such that the slurry is discharged upward from the slurry extrusion apparatus 100 to form a high back pressure at its bottom.

[0054] For example, refer to Figure 1 The outlet 14 can have a tubular or cylindrical shape (e.g., it can have a rectangular cross-section). For example, the outlet 14 can extend vertically (e.g., longitudinally) upward relative to the cylinder 12 and relative to the twin screw 13 (e.g., the outlet 14 can extend through the longitudinal sidewall of the cylinder 12). Figure 1As further shown, the ultrasonic dispersion device 200 can be provided at an upwardly oriented outlet 14 (e.g., the outlet 14 extending vertically upward relative to the cylinder 12 can be an upper outlet). Accordingly, the slurry extrusion device 100 can effectively control the degree of mixing and dispersion of the slurry and increase the residence time of the slurry therein.

[0055] For example, such as Figure 1 As shown, the slurry extrusion apparatus 100 can be a twin-screw extruder with two screws. In another example, the slurry extrusion apparatus 100 of this disclosure can be configured to have one or three screws.

[0056] Figure 2 This is a view illustrating a slurry extrusion apparatus 100 according to another embodiment of the present disclosure. Reference Figure 2 According to another embodiment of the present disclosure, the slurry extrusion apparatus 100 may include an integrated ultrasonic dispersion device 200.

[0057] For example, refer to Figure 2 The outlet 14 may extend parallel to the cylinder 12 (e.g., parallel to the longitudinal sidewall of the cylinder 12 and the twin screw 13). In addition, the ultrasonic dispersion device 200 may be provided inside the cylinder 12 or at the outlet 14 of the slurry extrusion device 100 (e.g., the outlet 14 extending parallel to the cylinder 12 may be a parallel outlet).

[0058] Because the ultrasonic dispersion device 200 is provided inside the cylinder 12 or at the outlet 14 of the slurry extrusion apparatus 100 (e.g., at a parallel outlet of the slurry extrusion apparatus 100), the slurry extrusion apparatus 100 can perform slurry control in a continuous process. As shown in the figures, if the slurry extrusion apparatus 100 is an extrusion apparatus including a twin-screw 13, the slurry extrusion apparatus 100 may include two outlets 14 and two ultrasonic dispersion devices 200.

[0059] For example, the first outlet 14-1 may have a center aligned with the center of the first screw of the twin-screw 13, and the second outlet 14-2 may have a center aligned with the center of the second screw of the twin-screw 13. Additionally, the first ultrasonic dispersion device 200-1 may have a center aligned with the center of the first screw, and the second ultrasonic dispersion device 200-2 may have a center aligned with the center of the second screw. Since the ultrasonic dispersion devices 200 are provided inside the barrel 12 or at the outlet 14 of the slurry extrusion apparatus 100 (e.g., at the parallel first outlet 14-1 and second outlet 14-2), and the centers of the ultrasonic dispersion devices 200 (e.g., the centers of the first ultrasonic dispersion device 200-1 and the second ultrasonic dispersion device 200-2) are aligned with the center of the screw 13, the slurry extrusion apparatus 100 can control the flow rate and velocity of the slurry to effectively control the residence time of the slurry therein.

[0060] Figure 3A and Figure 3B This is a diagram used to explain the slurry dispersion method using ultrasound according to embodiments of the present disclosure.

[0061] refer to Figure 3A and Figure 3B In the slurry dispersion method using ultrasound according to embodiments of the present disclosure, when the slurry is irradiated with ultrasound, electrical energy is converted into vibrational energy through the inverse piezoelectric effect. In this case, cavitation occurs through repeated strong compression and decompression. After cavitation occurs, the energy and pressure generated by the cavitation bubbles are applied to the slurry, which affects the particle size and dispersibility of the slurry.

[0062] Figure 3A It is a diagram used to explain the principles of ultrasound applications, and Figure 3B This is an example of a graph showing the particle size and particle distribution of the slurry as a function of ultrasonic amplitude, period, and propagation time. Figure 3B In this context, P, t, and c are sonication parameters, representing power, time, and period, respectively. (Reference) Figure 3A and Figure 3B The slurry extrusion apparatus 100 of this disclosure is configured to allow the ultrasonic dispersion device 200 to irradiate the slurry with ultrasonic waves, thereby causing the aforementioned cavitation to occur.

[0063] The configuration and function of the ultrasonic dispersion device 200 according to embodiments of the present disclosure will be described in detail below.

[0064] Figure 4 This is a block diagram illustrating an ultrasonic dispersion apparatus 200 according to an embodiment of the present disclosure.

[0065] refer to Figure 4An ultrasonic dispersion device 200 according to an embodiment of the present disclosure may include a communication unit 210 (e.g., a communicator), an input unit 220 (e.g., an input device), a display unit 230 (e.g., a display), a memory 240, a sensor unit 250 (e.g., a sensor), an ultrasonic unit 260 (e.g., an ultrasonic probe), a drive unit 270 (e.g., a driver), and a control unit 280 (e.g., a controller).

[0066] The communication unit 210 can communicate with user or administrator terminals via a network and with a server that controls the slurry extrusion equipment 100. For this purpose, the communication unit 210 can utilize internet communication such as 5G, LTE-A, LTE, and / or Wi-Fi.

[0067] Input unit 220 generates input data in response to input from an administrator managing the slurry extrusion equipment 100. Specifically, input unit 220 can receive different types of data from the administrator regarding the operating conditions of ultrasonic unit 260, operating control signals of ultrasonic unit 260, etc. For this purpose, input unit 220 may include, for example, a keyboard, a dome switch, a touch panel, touch keys, and / or buttons.

[0068] Display unit 230 outputs output data in response to operation of slurry extrusion equipment 100. Specifically, display unit 230 can display different types of data on the slurry in slurry extrusion equipment 100 measured by sensor unit 250, the operating status of ultrasonic unit 260, etc. For this purpose, display unit 230 may include, for example, a liquid crystal display (LCD), a light-emitting diode (LED) display, an organic light-emitting diode (OLED) display, a microelectromechanical system (MEMS) display, and / or an electronic paper display.

[0069] The memory 240 stores programs for operating the ultrasound unit 260. In particular, the memory 240 may store conditional information about the operation of the ultrasound unit 260, algorithms for controlling the operation of the ultrasound unit 260 via the control unit 280, etc.

[0070] Sensor unit 250 can measure the state information of the slurry in slurry extrusion equipment 100. The state information of the slurry may include, for example, the slurry's temperature, pressure, density, viscosity, uniformity, flow rate, and flow velocity. Sensor unit 250 can measure the state information of the slurry using sensors installed in slurry extrusion equipment 100. For this purpose, sensor unit 250 may include various sensors, such as temperature sensors, pressure sensors, vibration sensors, impact sensors, flow rate sensors, and / or flow velocity sensors.

[0071] The ultrasonic unit 260 can irradiate the slurry with ultrasonic waves. The ultrasonic unit 260 may include at least two probes, wherein a first probe may be provided (e.g., directly on) the wall (also referred to as the outlet wall or side) of the slurry extrusion apparatus 100, and a second probe may be provided on a column (hereinafter referred to as the "outlet column") located at the center of the outlet 14 of the slurry extrusion apparatus 100. The ultrasonic unit 260 can repeatedly expose the slurry to ultrasonic waves (which are regular and intense stimuli) for a short period of time, thereby controlling the physical properties, dispersibility, and uniformity of the slurry.

[0072] The drive unit 270 can control the movement of the ultrasonic unit 260 and the outlet 14. For example, the drive unit 270 can rotate the wall of the outlet 14 and the outlet column of the slurry extrusion device 100, and for this purpose, the drive unit 270 may include a motor.

[0073] The control unit 280 can control the communication unit 210, input unit 220, display unit 230, memory 240, sensor unit 250, ultrasonic unit 260, and drive unit 270. The control unit 280 can control the ultrasonic unit 260 to irradiate the slurry in the slurry extrusion equipment 100 with ultrasonic waves.

[0074] The control unit 280 can use the slurry state information measured by the sensor unit 250 to set irradiation conditions, including the time, interval, intensity, etc., of ultrasonic irradiation by the ultrasonic unit 260. The control unit 280 can control the ultrasonic unit 260 to irradiate the slurry with ultrasound based on the set irradiation conditions.

[0075] As an example, the control unit 280 can induce ultrasonic irradiation under preset first irradiation conditions when the slurry flow rate is equal to or greater than a preset flow rate, and can induce ultrasonic irradiation under preset second irradiation conditions when the slurry flow rate is less than a preset flow rate. As another example, the control unit 280 can induce ultrasonic irradiation under preset third irradiation conditions when the slurry flow rate is equal to or greater than a preset flow rate, and can induce ultrasonic irradiation under preset fourth irradiation conditions when the slurry flow rate is less than a preset flow rate.

[0076] According to one embodiment, the ultrasonic unit 260 can be a ceramic ultrasonic probe. Since the ultrasonic unit 260 is a ceramic ultrasonic probe, the incidence of foreign matter in the slurry can be significantly reduced.

[0077] According to one embodiment, the ultrasonic dispersion device 200 may further include a coolant supply unit. The coolant supply unit may be configured to supply cooling water to the ultrasonic unit 260. Since cooling water is supplied to the ultrasonic unit 260, stability related to the temperature or load of the ultrasonic unit 260 can be ensured.

[0078] According to one embodiment, the ultrasonic unit 260 may include a plurality of ultrasonic probes, and the plurality of ultrasonic probes may be arranged in a multi-array configuration in the slurry extrusion apparatus 100. This allows full utilization of the ultrasonic irradiation effect of the ultrasonic probes and increases the residence time of the slurry.

[0079] In the following text, reference will be made to Figure 5A and Figure 5B The arrangement and operation of the ultrasonic unit 260 in the ultrasonic dispersion device 200 are described in detail.

[0080] Figure 5A and Figure 5B This is a view illustrating an ultrasonic dispersion apparatus 200 according to an embodiment of the present disclosure. Figure 5A and Figure 5B An example is shown of the arrangement of the ultrasonic unit 260 in an ultrasonic dispersion apparatus 200 according to an embodiment of the present disclosure.

[0081] Figure 5A This is a side view of the arrangement of the ultrasound unit 206, and Figure 5B This is a front view of the arrangement of the ultrasound unit 260. Figure 5A and Figure 5B In the example, the ultrasonic unit 206 is illustrated as a plurality of ultrasonic probes.

[0082] For example, refer to Figure 5A and Figure 5B According to an embodiment of the present disclosure, the ultrasonic probe of the ultrasonic unit 260 can be provided at the outlet 14 of the slurry extrusion apparatus 100. Although Figure 5A and Figure 5B The outlet 14 of the slurry extrusion apparatus 100 illustrated is cylindrical (it is only an example), but the outlet 14 can have various shapes.

[0083] According to an embodiment of the present disclosure, the ultrasonic probe of the ultrasonic unit 260 can be arranged in a zigzag pattern at regular intervals (e.g., distance intervals) along the slurry movement path. Figure 5A On the side of outlet 14 (e.g., on the inner wall of outlet 14). Additionally, when viewed in the extending direction of outlet 14, the ultrasonic probes of ultrasonic unit 260 can be arranged at regular intervals (e.g., distance intervals) or at an angle (e.g., along the inner circumference of outlet 14). Figure 5B ).

[0084] Figure 6A and Figure 6B This is a view illustrating an ultrasonic dispersion apparatus 200' according to another embodiment of the present disclosure. Figure 6A and Figure 6B An example is shown of the arrangement of ultrasonic probes in an ultrasonic dispersion apparatus 200' according to another embodiment of the present disclosure.

[0085] Figure 6A This is a side view of the arrangement of the ultrasound probes in the ultrasound unit 260. Figure 6B This is a front view of the arrangement of the ultrasound probes in the ultrasound unit 260. Figure 6A and Figure 6B In the example, the ultrasonic unit 206 is illustrated as a plurality of ultrasonic probes.

[0086] refer to Figure 6A and Figure 6B According to another embodiment of this disclosure, the ultrasonic probe of the ultrasonic unit 260 can be provided at the outlet 14 of the slurry extrusion apparatus 100. Although Figure 6A and Figure 6B The outlet 14 of the slurry extrusion apparatus 100 illustrated is cylindrical (it is only an example), but the outlet 14 can have various shapes.

[0087] The ultrasonic dispersion device 200' may include a plurality of ultrasonic probes, wherein a first ultrasonic probe 260-1 may be provided on the wall (e.g., inner wall) of the outlet 14 of the slurry extrusion apparatus 100, and a second ultrasonic probe 260-2 may be provided on a column located at the center of the outlet 14 of the slurry extrusion apparatus 100. When viewed in a direction perpendicular to the extension direction of the outlet 14, the first ultrasonic probe 260-1 and the second ultrasonic probe 260-2 may be arranged at regular intervals (e.g., distance intervals) along the slurry movement path. When viewed in a direction perpendicular to the extension direction of the outlet 14, the first ultrasonic probe 260-1 and the second ultrasonic probe 260-2 may be arranged in a zigzag pattern so as not to overlap each other. Additionally, when viewed in the extension direction of the outlet 14, the first ultrasonic probe 260-1 and the second ultrasonic probe 260-2 may be arranged in a zigzag pattern at regular intervals (e.g., distance intervals) or at an angle so as not to overlap each other.

[0088] Figure 7A and Figure 7B This is a view illustrating an ultrasonic dispersion apparatus 200'' according to yet another embodiment of the present disclosure. Figure 7A and Figure 7B The arrangement and movement of the ultrasonic probe in an ultrasonic dispersion apparatus 200'' according to yet another embodiment of the present disclosure are illustrated.

[0089] Figure 7A It is a side view of the arrangement of the ultrasound probe, and Figure 7B This is a front view of the ultrasonic probe setup. Figure 7A and Figure 7B In the example, the ultrasonic unit 206 is illustrated as a plurality of ultrasonic probes.

[0090] refer to Figure 7A and Figure 7BThe ultrasonic probe of the ultrasonic unit 206 can be provided at the outlet 14 of the slurry extrusion device 100. Although Figure 7A and Figure 7B The outlet 14 of the slurry extrusion apparatus 100 illustrated is cylindrical (it is only an example), but the outlet 14 can have various shapes.

[0091] The ultrasonic dispersion device 200'' may include a plurality of ultrasonic probes, wherein a first ultrasonic probe 260-1 may be provided on the wall of the outlet 14 of the slurry extrusion device 100, and a second ultrasonic probe 260-2 may be provided on a column located at the center of the outlet 14 of the slurry extrusion device 100. Furthermore, the wall of the outlet 14 on which the first ultrasonic probe 260-1 is placed and the column located at the center of the outlet 14 on which the second ultrasonic probe 260-2 is placed can rotate in one direction.

[0092] The ultrasonic dispersion device 200'' can control the drive unit 270 to rotate the outlet wall and the outlet column. The ultrasonic dispersion device 200'' can use slurry status information to control the rotation of at least one of the outlet wall and the outlet column.

[0093] As an example, the ultrasonic dispersion device 200'' can control the rotation of only one of the outlet wall and the outlet column when the slurry flow rate is equal to or greater than a preset flow rate, and can control the rotation of both the outlet wall and the outlet column when the slurry flow rate is less than the preset flow rate. As another example, the ultrasonic dispersion device 200'' can control the rotation of only one of the outlet wall and the outlet column when the slurry flow rate is equal to or greater than a preset flow rate, and can control the rotation of both the outlet wall and the outlet column when the slurry flow rate is less than the preset flow rate.

[0094] The ultrasonic dispersion device 200'' can use the slurry's state information to set the rotation direction of the outlet wall and outlet column. For example, the ultrasonic dispersion device 200'' can control the outlet wall and outlet column to rotate in the same direction when the slurry's flow rate or velocity is equal to or greater than a preset standard, and can control the outlet wall and outlet column to rotate in different directions when the slurry's flow rate or velocity is less than a preset standard. If the ultrasonic dispersion device 200'' controls the outlet wall and outlet column to rotate in different directions, the shear force and shear velocity applied to the slurry can be doubled compared to when the outlet wall and outlet column rotate in the same direction, thereby further ensuring the slurry's dispersibility.

[0095] The ultrasonic dispersion device 200'' can use the slurry state information to set the rotation speed of the outlet wall and the outlet column. For example, the ultrasonic dispersion device 200'' can control the outlet wall and the outlet column to rotate at a preset first rotation speed when the slurry flow rate or velocity is equal to or greater than a preset standard, and can control the outlet wall and the outlet column to rotate at a preset second rotation speed when the slurry flow rate or velocity is less than a preset standard.

[0096] As described above, the ultrasonic dispersion device 200'' can use the slurry state information to set whether to rotate the outlet wall and outlet column, the rotation direction and rotation speed of the outlet wall and outlet column, etc.

[0097] Figure 8 This is a flowchart illustrating a method for driving a slurry extrusion apparatus according to an embodiment of the present disclosure.

[0098] refer to Figure 8 The method of driving a slurry extrusion apparatus according to an embodiment of the present disclosure may include introducing slurry material into the inlet of the slurry extrusion apparatus 100 (S100), driving a twin screw to produce a slurry mixture by the slurry extrusion apparatus 100 (S110), measuring slurry state information by an ultrasonic dispersion device 200 (S120), using the slurry state information by the ultrasonic dispersion device 200 to set irradiation conditions including the time, interval, intensity, etc. of ultrasonic irradiation by an ultrasonic unit (S130), controlling the ultrasonic unit (e.g., an ultrasonic probe) to irradiate the slurry with ultrasonic waves by the ultrasonic dispersion device 200 based on the set irradiation conditions (S140), using the slurry state information by the ultrasonic dispersion device 200 to set whether to rotate the outlet wall and outlet column, their rotation direction, and rotation speed, etc. (S150), and controlling the drive unit to rotate the outlet wall and outlet column by the ultrasonic dispersion device 200 based on the set whether to rotate the outlet wall and outlet column, their rotation direction, and rotation speed, etc. (S160).

[0099] The method of driving a slurry extrusion apparatus according to embodiments of the present disclosure has been described above with reference to the flowcharts presented in the accompanying drawings. For simplicity, the method has been illustrated and described as a series of blocks, but the order of these blocks can be changed. For example, some blocks may occur in a different order than that illustrated and described herein, or simultaneously with other blocks, and various different branches, processes, and sequences of blocks that achieve the same or similar results can be implemented. Furthermore, it may not be necessary to implement all the illustrated blocks to implement the method described herein.

[0100] At the same time, in reference Figure 8 In the description, each of S100 to S160 may be further divided into additional steps, operations, or stages, or combined into fewer steps, operations, or stages, depending on the embodiments of this disclosure. Additionally, some steps, operations, or stages may be omitted or their order may be changed if necessary. Furthermore, even if any other omissions exist, Figures 1 to 7B The content can be applied to Figure 8 The content. On the other hand... Figure 8 The content can be applied to Figures 1 to 7B The content.

[0101] In the following, materials that can be used in a slurry mixed in a slurry extrusion apparatus according to embodiments of the present disclosure are described.

[0102] Compounds capable of reversibly inserting and deintercalating lithium (e.g., lithiation intercalation compounds) can be used as positive electrode active materials. Specifically, one or more of the metals selected from cobalt, manganese, nickel, and combinations thereof, in combination with lithium, can be used as positive electrode active materials.

[0103] The composite oxide can be a lithium transition metal composite oxide. Detailed examples of composite oxides may include lithium nickel oxides, lithium cobalt oxides, lithium manganese oxides, lithium iron phosphate compounds, cobalt-free nickel manganese oxides, or combinations thereof.

[0104] For example, a compound represented by one of the following chemical formulas can be used: Li a A 1-b X b O 2-c D' c (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05); Li a Mn 2-b X b O 4-c D' c (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05); Li a Ni 1-b-c Co b X c O 2-α D' α (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.5, 0<α<2); Li a Ni 1-b-c Mn b X c O 2-α D' α (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.5, 0<α<2); Li a Ni b Co c L 1 d G e O2 (0.90≤a≤1.8, 0≤b≤0.9, 0≤c≤0.5, 0≤d≤0.5, 0≤e≤0.1); Li a NiG b O2 (0.90≤a≤1.8, 0.001≤b≤0.1); Li a CoG bO2 (0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn 1-b G b O2 (0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn2G b O4 (0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn 1-g G g PO4 (0.90≤a≤1.8, 0≤g≤0.5); Li (3-f) Fe2(PO4)3 (0≤f≤2); and Li a FePO4 (0.90≤a≤1.8).

[0105] In the chemical formula, A can be Ni, Co, Mn, or a combination thereof. X can be Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, rare earth elements, or a combination thereof; D' can be O, F, S, P, or a combination thereof. G can be Al, Cr, Mn, Fe, Mg, La, Ce, Sr, V, or a combination thereof. L 1 It can be Mn, Al, or a combination thereof.

[0106] The positive electrode for a lithium secondary battery may include a current collector and a positive electrode active material layer formed on the current collector. The positive electrode active material layer may contain a positive electrode active material and may further contain a binder and / or a conductive material.

[0107] The content of the positive electrode active material can be 90 wt.% to 99.5 wt.% relative to the 100 wt.% positive electrode active material layer. The content of the binder and conductive material can be 0.5 wt.% to 5 wt.% relative to the 100 wt.% positive electrode active material layer.

[0108] Al can be used as a current collector.

[0109] The negative electrode active material may include materials capable of reversibly inserting / deintercalating with respect to lithium ions, lithium metal, lithium metal alloys, materials capable of doping and dedoping with respect to lithium, or transition metal oxides.

[0110] Materials capable of reversibly intercalating / deintercalating relative to lithium ions can include carbon negative electrode active materials, such as crystalline carbon, amorphous carbon, or combinations thereof. Examples of crystalline carbon can include graphite, such as natural or synthetic graphite. Examples of amorphous carbon can include soft or hard carbon, mesophase pitch carbides, and calcined coke.

[0111] The Si negative electrode active material or the Sn negative electrode active material can be used as a material capable of doping and de-doping with respect to lithium. The Si negative electrode active material can be silicon, a silicon-carbon composite, SiO x (0 < x ≤ 2), a Si alloy, or a combination thereof.

[0112] The silicon-carbon composite can be a composite of silicon and amorphous carbon. According to one embodiment, the silicon-carbon composite can include silicon particles and can have a form in which amorphous carbon has been coated on the surface of the silicon particles.

[0113] The silicon-carbon composite can further include crystalline carbon. For example, the silicon-carbon composite can include a core containing crystalline carbon and silicon particles and an amorphous carbon coating provided on the surface of the core.

[0114] The negative electrode for a lithium secondary battery can include a current collector and a negative electrode active material layer provided on the current collector. The negative electrode active material layer can contain a negative electrode active material and can further contain a binder and / or a conductive material.

[0115] For example, with respect to 100 wt.% of the negative electrode active material layer, the negative electrode active material layer can contain 90 wt.% to 99 wt.% of the negative electrode active material, 0.5 wt.% to 5 wt.% of the binder, and 0 wt.% to 5 wt.% of the conductive material.

[0116] A non-aqueous binder, an aqueous binder, a dry binder, or a combination thereof can be used as the binder. If an aqueous binder is used as the binder for the negative electrode, the binder for the negative electrode can further include a cellulose-based compound capable of imparting viscosity.

[0117] One selected from nickel foil, stainless steel foil, titanium foil, nickel foam, copper foam, a polymer substrate coated with a conductive metal, and a combination thereof can be used as the current collector for the negative electrode.

[0118] As is apparent from the above description, according to an embodiment of the present disclosure, there is provided an ultrasonic dispersion device configured to form a multi-ultrasonic dispersion zone inside or at the outlet of a slurry extrusion device. Therefore, the slurry can be repeatedly exposed to ultrasonic waves (which are regular and strong stimuli) in a short time, thereby effectively controlling the physical properties, dispersibility, and uniformity of the slurry.

[0119] According to an embodiment of the present disclosure, the cavitation of the slurry can be maximized by ultrasonic waves to control the particle size and distribution of the slurry, thereby ensuring that the physical properties of the slurry are optimized for the process after it is discharged.

[0120] According to embodiments of this disclosure, since it is configured to discharge the slurry upward from the slurry extrusion device to form a high back pressure at its bottom, the degree of mixing and dispersion of the slurry can be effectively controlled and the residence time of the slurry can be increased.

[0121] According to embodiments of this disclosure, compared to conventional mechanical slurry mixing, ultrasonic mixing of slurries can be used to allow for uniform mixing and homogenization of the slurry, and the slurry can be kept in a stable phase for a long time, even during degassing processes.

[0122] According to embodiments of this disclosure, the residence time of the slurry can be increased by arranging multiple probes in the ultrasonic dispersion device.

[0123] According to embodiments of this disclosure, since the ultrasonic dispersion device is provided with a ceramic ultrasonic probe and cooling water, the occurrence rate of foreign matter in the slurry can be significantly reduced and the stability related to the temperature or load of the ultrasonic dispersion device can be ensured.

[0124] In summary, twin-screw extruders can be limited in terms of slurry quality control due to the very short residence time of the slurry in the extruder. To compensate, additional processes for dispersing and homogenizing the slurry after it has been discharged from the extruder may be required; however, these additional processes may interrupt the continuous process within the extruder. Therefore, it is desirable to introduce a continuous process for dispersion and homogenization that can maintain high throughput and high speed within the extruder.

[0125] This disclosure provides an ultrasonic dispersion device capable of controlling the physical properties, dispersibility, and uniformity of slurry by ultrasonic irradiation within an extruder, and a slurry extrusion apparatus including the ultrasonic dispersion device. Specifically, according to one aspect of this disclosure, a slurry extrusion apparatus is provided, comprising: an inlet for introducing slurry material therethrough; a cylinder, which is a region for slurry movement; at least one screw configured to apply mechanical shear force to the slurry by rotation therethrough; an outlet for extruding the slurry therethrough; and an ultrasonic dispersion device including a plurality of ultrasonic probes positioned at the outlet for ultrasonic irradiation of the slurry, and a control unit configured to control the ultrasonic irradiation of the ultrasonic probes, wherein the outlet is an upper outlet or a parallel outlet.

[0126] However, the aspects and features of this disclosure are not limited to those described above, and those skilled in the art will clearly understand from the above detailed description other aspects and features not mentioned.

[0127] This document has disclosed exemplary embodiments. Although specific terminology has been used, it is used and interpreted in a general and descriptive sense only and is not intended to be limiting. In some instances, as will be apparent to those skilled in the art at the time of filing this application, features, characteristics, and / or elements described in connection with particular embodiments may be used alone or in combination with features, characteristics, and / or elements described in connection with other embodiments, unless specifically instructed otherwise. Accordingly, those skilled in the art will understand that various changes in form and detail may be made without departing from the spirit and scope of the invention as set forth in the appended claims.

Claims

1. An ultrasonic dispersion device in a slurry extrusion apparatus, the ultrasonic dispersion device comprising: An ultrasonic probe is located at the outlet of the slurry extrusion apparatus and is configured to irradiate the slurry in the slurry extrusion apparatus with ultrasonic waves. as well as A controller is configured to control the ultrasonic irradiation of the ultrasonic probe.

2. The ultrasonic dispersion apparatus according to claim 1, wherein the ultrasonic probes are arranged in a zigzag pattern at regular intervals on the side of the outlet along the movement path of the slurry, and when viewed in the extension direction of the outlet, the ultrasonic probes are arranged at regular intervals or angles.

3. The ultrasonic dispersion device according to claim 1, wherein the ultrasonic probe includes a first ultrasonic probe on the side of the outlet and a second ultrasonic probe on a column of the outlet, the column extending through the center of the outlet.

4. The ultrasonic dispersion device according to claim 3, wherein: When viewed in a direction perpendicular to the extension direction of the outlet, the first and second ultrasonic probes are arranged in a zigzag pattern at regular intervals along the movement path of the slurry so as not to overlap each other. When viewed in the direction of extension of the outlet, the first ultrasonic probe and the second ultrasonic probe are arranged in a zigzag pattern at regular intervals or angles so as not to overlap each other.

5. The ultrasonic dispersion device of claim 3, further comprising a driver configured to rotate the side of the outlet and the column of the outlet, the controller configured to control the driver to rotate at least one of the side of the outlet and the column of the outlet.

6. The ultrasonic dispersion apparatus of claim 5, further comprising a sensor configured to measure slurry state information including at least one of temperature, pressure, density, viscosity, uniformity, flow rate, and flow velocity of the slurry, wherein the controller is configured to use the slurry state information to set at least one of whether to rotate the at least one of the side of the outlet and the column of the outlet, the direction of rotation of the at least one of the side of the outlet and the column of the outlet, and the rotation speed of the at least one of the side of the outlet and the column of the outlet.

7. The ultrasonic dispersion apparatus of claim 1, further comprising a sensor configured to measure slurry state information including at least one of temperature, pressure, density, viscosity, uniformity, flow rate, and flow velocity of the slurry, wherein the controller is configured to use the slurry state information to set irradiation conditions including at least one of time, interval, and intensity of ultrasonic irradiation by the ultrasonic probe.

8. The ultrasonic dispersion device according to any one of claims 1 to 7, wherein the ultrasonic probe is a ceramic ultrasonic probe.

9. The ultrasonic dispersion apparatus according to any one of claims 1 to 7, further comprising a coolant supply unit configured to supply cooling water to the ultrasonic probe.

10. The ultrasonic dispersion apparatus according to any one of claims 1 to 7, wherein the ultrasonic dispersion apparatus has a center that is aligned with the center of the screw in the slurry extrusion apparatus.

11. A slurry extrusion apparatus, comprising, An inlet is configured to introduce slurry material through the inlet; A cylinder, connected to the inlet, is configured to move the slurry material through the cylinder; At least one screw, located in the barrel, is configured to rotate and apply a mechanical shear force to the slurry material in the barrel; An outlet, connected to the cylinder, is either an upper outlet or a parallel outlet, and is configured to extrude the slurry material from the cylinder; as well as An ultrasonic dispersion device, at the outlet, includes an ultrasonic probe and a controller, the ultrasonic probe being configured to irradiate the slurry material with ultrasonic waves, and the controller being configured to control the ultrasonic irradiation by the ultrasonic probe.

12. The slurry extrusion apparatus according to claim 11, wherein the ultrasonic probes are arranged in a zigzag pattern at regular intervals on the side of the outlet along the movement path of the slurry material, and the ultrasonic probes are arranged at regular intervals or angles when viewed in the extension direction of the outlet.

13. The slurry extrusion apparatus of claim 11, wherein the ultrasonic probe comprises a first ultrasonic probe on the side of the outlet and a second ultrasonic probe on a column of the outlet extending through the center of the outlet.

14. The slurry extrusion apparatus according to claim 13, wherein: When viewed in a direction perpendicular to the extension direction of the outlet, the first and second ultrasonic probes are arranged in a zigzag pattern at regular intervals along the movement path of the slurry material so as not to overlap each other. When viewed in the direction of extension of the outlet, the first ultrasonic probe and the second ultrasonic probe are arranged in a zigzag pattern at regular intervals or angles so as not to overlap each other.

15. The slurry extrusion apparatus of claim 13, wherein the ultrasonic dispersion device further comprises a driver configured to rotate the side of the outlet and the column of the outlet, and the controller configured to control the driver to rotate at least one of the side of the outlet and the column of the outlet.

16. The slurry extrusion apparatus of claim 15, wherein the ultrasonic dispersion device further comprises a sensor configured to measure slurry state information comprising at least one of temperature, pressure, density, viscosity, uniformity, flow rate, and flow velocity of the slurry material, and the controller configured to use the slurry state information to set at least one of whether to rotate the at least one of the side of the outlet and the column of the outlet, the direction of rotation of the at least one of the side of the outlet and the column of the outlet, and the rotational speed of the at least one of the side of the outlet and the column of the outlet.

17. The slurry extrusion apparatus of claim 11, wherein the ultrasonic dispersion device further comprises a sensor configured to measure slurry state information comprising at least one of temperature, pressure, density, viscosity, uniformity, flow rate, and flow velocity of the slurry material, and the controller is configured to use the slurry state information to set irradiation conditions comprising at least one of time, interval, and intensity of ultrasonic irradiation by the ultrasonic probe.

18. The slurry extrusion apparatus according to any one of claims 11 to 17, wherein the ultrasonic probe is a ceramic ultrasonic probe.

19. The slurry extrusion apparatus according to any one of claims 11 to 17, wherein the ultrasonic dispersion device further comprises a coolant supply unit configured to supply cooling water to the ultrasonic probe.

20. The slurry extrusion apparatus according to any one of claims 11 to 17, wherein the outlet has a center that is in a straight line with the center of the screw.

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