Slurry mixing device

Abstract

A slurry mixing device includes: a stirrer located in a suspended ceiling portion of the slurry mixing device and configured to rotate about a rotation axis thereof while rotating about a first rotation axis thereof; the disperser is positioned in the suspended ceiling part of the slurry mixing device and is configured to rotate around the rotating axis of the disperser while rotating around a second rotating axis different from the first rotating axis; a driver configured to provide a rotational force to the agitator and the disperser; a container configured to accommodate the slurry mixed by the stirrer and the disperser; and a liquid supply portion located in at least one of the ceiling portion, the stirrer, the disperser, and the container, and configured to provide a liquid.

Description

[0001] This application claims priority to and the benefit of Korean Patent Application No. 10-2024-0038402 filed on March 20, 2024, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0002] Aspects of embodiments of the present disclosure relate to slurry mixing apparatus. Background Art

[0003] Unlike primary batteries, which are not designed to be charged, secondary batteries are designed to be discharged and recharged. Low-capacity secondary batteries are used in small portable electronic devices such as smartphones, feature phones, notebook computers, digital cameras, and video cameras, while large-capacity secondary batteries are widely used as power sources for driving motors in hybrid vehicles or electric vehicles and for energy storage.

[0004] In a method for manufacturing a secondary battery, an electrode can be formed by using a coating method, which includes applying a slurry for an electrode, including, for example, an electrode active material, a conductive material, a binder, and a solvent for dissolving the binder, onto a current collector, and drying the slurry. When manufacturing the slurry for an electrode, a liquid slurry mixture having a viscosity suitable for coating and material properties that can be used as a battery electrode can be manufactured by physically and uniformly dispersing and mixing a mixed material including an electrode active material, a conductive material, a binder, and a solvent, and in various liquid and powder phases.

[0005] Generally, a slurry mixing device called a slurry mixer is used to manufacture a slurry mixture by mixing mixing materials.

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

[0007] In conventional slurry mixing devices, some slurry remains after slurry mixing is terminated, and the volume of the slurry residue may continue to increase over time. Furthermore, the slurry residue has an adverse effect on the quality of the slurry. Therefore, embodiments of the present disclosure provide a slurry mixing device including a liquid providing portion (e.g., a liquid supply portion) that uses a liquid to remove the slurry residue, thereby minimizing the slurry residue in the slurry mixing device.

[0008] However, aspects and features of the present disclosure are not limited to those above, and other aspects and features not mentioned herein will be clearly understood by those skilled in the art from the following description of the present disclosure.

[0009] According to one embodiment of the present disclosure, a slurry mixing device configured to mix slurry by using rotation and rotation includes: an agitator, which is in a suspended ceiling of the slurry mixing device and is configured to rotate around its rotation axis while rotating around its first rotation axis; a disperser, which is in the suspended ceiling of the slurry mixing device and is configured to rotate around the rotation axis while rotating around a second rotation axis different from the first rotation axis; a driver, which is configured to provide rotational force to the agitator and the disperser; a container, which is configured to accommodate the slurry mixed by the agitator and the disperser; and a liquid supply part, which is in at least one of the suspended ceiling of the slurry mixing device, the agitator, the disperser and the container, and is configured to provide liquid.

[0010] According to an embodiment of the present invention, slurry residue present in the slurry mixing apparatus after mixing of the slurry is reduced or minimized by including a liquid supply that provides liquid to one or more of the agitator, the distributor, and the container.

[0011] Furthermore, according to the embodiments of the present disclosure, since a manual cleaning process can be omitted due to the reduction of slurry residue, the slurry mixing apparatus reduces manufacturing and operating time.

[0012] Furthermore, according to embodiments of the present disclosure, slurry can be manufactured without sacrificing raw materials, thereby reducing costs. Furthermore, because the slurry is well mixed and slurry residue is reduced, discrepancies between the input material amount and the design method can be prevented, resulting in the amount of material used being less than the target design value. Consequently, slurry can be manufactured with a ratio closer to the raw materials in the target electrode plate design.

[0013] However, aspects and features of the present disclosure are not limited to the above aspects and features, and those skilled in the art may understand other aspects and features not explicitly described above through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings attached to this specification illustrate embodiments of the present disclosure and, together with the detailed description of the present disclosure, further describe aspects and features of the present disclosure. Therefore, the present disclosure should not be construed as being limited to the accompanying drawings, wherein:

[0015] Figure 1 is a schematic diagram illustrating a slurry mixing device according to an embodiment of the present disclosure.

[0016] Figure 2 4 is a schematic cross-sectional view of a liquid supply portion of a slurry mixing device according to an embodiment of the present disclosure.

[0017] Figure 3FIG. 1 is a schematic diagram illustrating a slurry mixing device including a residue removal portion according to an embodiment of the present disclosure.

[0018] Figures 4A to 4E An example of a rotating body as a residue removing part of a slurry mixing device according to various embodiments of the present disclosure is illustrated.

[0019] Figure 5A and Figure 5B Examples of auxiliary blades as a residue removing portion of a slurry mixing device according to various embodiments of the present disclosure are illustrated.

[0020] Figure 6 FIG. 1 is a schematic diagram illustrating a slurry mixing device including a plurality of dispersing blades according to an embodiment of the present disclosure.

[0021] Figure 7 FIG. 1 is a schematic diagram illustrating a slurry mixing device including a plurality of dispersing blades having different diameters according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0022] Hereinafter, some embodiments of the present disclosure will be described with reference to the accompanying drawings. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention is conceived. It will also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and / or this specification, and should not be interpreted in an idealized or overly formal sense, unless so explicitly defined herein.

[0023] The embodiments described in this specification and the configurations shown in the drawings are merely some embodiments of the present disclosure and do not represent all technical spirits, aspects, and features of the present disclosure. Therefore, it should be understood that there may be various equivalents and modifications that can replace or modify the embodiments described herein at the time of filing this application.

[0024] It should be understood that when an element or layer is referred to as being “on,” “connected to,” or “coupled to” another element or layer, it can be directly on, connected to, or coupled to the other element or layer, or one or more intervening elements or layers may be present. When an element or layer is referred to as being “directly on,” “directly connected to,” or “directly coupled to” another element or layer, there are no intervening elements or layers. For example, when a first element is described as being “coupled to” or “connected to” a second element, the first element can be directly coupled or connected to the second element, or the first element can be indirectly coupled or connected to the second element via one or more intervening elements.

[0025] In the accompanying drawings, for clarity of illustration, the sizes of various elements, layers, etc. may be exaggerated. The same reference numerals indicate the same elements. As used herein, the term "and / or" includes any and all combinations of one or more associated listed items. Further, the use of "may" when describing embodiments of the present disclosure relates to "one or more embodiments of the present disclosure." Expressions such as "at least one of..." and "any one of..." before / after a list of elements modify the entire list of elements without modifying the individual elements in the list. When phrases such as "at least one of A, B, and 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 specify a list of elements A, B, and C, the phrase may refer to any and all suitable combinations or subsets of A, B, and C, such as A, B, C, A and B, A and C, B and C, or A and B and C. As used herein, the terms "use" and "being used" may be considered synonymous with the terms "utilize" and "being utilized." As used herein, the terms "substantially," "about," and similar terms are used as terms of approximation rather than terms of degree, and are intended to take into account the inherent variations in measurements or calculations that one of ordinary skill in the art would recognize.

[0026] It will be understood that although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms are used to distinguish one element, component, region, layer, or section from another element, component, region, layer, or section. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or section discussed below may be referred to as a second element, component, region, layer, or section.

[0027] For ease of description, spatially relative terms such as "below," "beneath," "below," "above," "on," etc. may be used herein to describe the relationship of one element or feature to another element or feature as shown in the figures. It will be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, elements or features described as being "below" or "beneath" other elements or features will be oriented as being "above" or "above" the other elements or features. Thus, the term "below" can encompass both above and below orientations. The device can be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0028] The terms used herein are for the purpose of describing the embodiments of the present disclosure and are not intended to limit the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular form "a" and "an" are also intended to include the plural form. It will be further understood that when used in this specification, the terms "comprise" and / or "comprising" specify the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups thereof.

[0029] In addition, any numerical range disclosed and / or listed herein is intended to include all subranges of the same numerical precision contained within the listed range. For example, the range of "1.0 to 10.0" is intended to include (and include) all subranges between the listed minimum value of 1.0 and the listed maximum value of 10.0, i.e., having a minimum value equal to or greater than 1.0 and a maximum value equal to or less than 10.0, for example, such as 2.4 to 7.6. Any maximum numerical limit listed herein is intended to include all lower numerical limits contained therein, and any minimum numerical limit listed in this specification is intended to include all higher numerical limits contained therein. Therefore, the applicant reserves the right to amend this specification, including the claims, to explicitly list any subranges contained within the range explicitly listed herein. All such ranges are intended to be inherently described in this specification, so that the modifications made to explicitly list any such subranges will meet the requirements.

[0030] Referring to two compared elements, features, etc. as "the same" may mean that they are "substantially the same." Thus, the phrase "substantially the same" can include situations with what is considered in the art to be low variance, for example, 5% or less. Furthermore, when a parameter is referred to as being consistent in a given region, this may mean that it is consistent with respect to the average value.

[0031] Throughout the specification, unless otherwise specified, each element may be in the singular or in the plural.

[0032] Arranging any element "above (or below)" or "on (or below)" another element may mean that the arbitrary element may be set to be in contact with the upper (or lower) surface of the element, and other elements may also be interposed between the element and any element set above (or below) the element.

[0033] Throughout this specification, unless otherwise indicated, when "A and / or B" is stated, it means A, B, or A and B. In other words, "and / or" includes any or all combinations of the listed items. Unless otherwise indicated, when "C to D" is stated, it means C or more and D or less.

[0034] Figure 1is a schematic diagram illustrating a slurry mixing device according to an embodiment of the present disclosure.

[0035] refer to Figure 1 According to an embodiment of the present disclosure, a slurry mixing device 100 may include a stirring portion (e.g., a stirrer) 110, a dispersing portion (e.g., a disperser) 120, a driving portion (e.g., a driver) 130, a container 140, and a liquid providing portion (e.g., a liquid supply portion). Figure 1 The slurry mixing device 100 illustrated in FIG is an exemplary embodiment. The components of the slurry mixing device 100 according to other embodiments of the present disclosure are not limited to Figure 1 Some components may be added to the slurry mixing apparatus 100, and some components of the slurry mixing apparatus 100 may be changed or omitted.

[0036] The stirring section 110 can stir a mixed material that is in a liquid phase and a powder phase and includes an electrode active material, a conductive material, a binder, and a solvent (e.g., consisting of them). The stirring section 110 can be provided in a ceiling (e.g., top) of the slurry mixing device 100 and can perform a meteoric motion (e.g., an orbital motion or a gyration), wherein the stirring section 110 rotates around its rotation axis while rotating around its first rotation axis, so that the mixed material is uniformly mixed. In one embodiment, the stirring section 110 may include a stirring blade having a spiral form or shape, wherein the stirring blade twists in a vertical direction. In addition, in one embodiment, the stirring section 110 may include two or more stirring blades.

[0037] The dispersion section 120 may be provided in the suspended ceiling of the slurry mixing device 100 and may perform a meteoric motion, wherein the dispersion section 120 rotates around its rotation axis while rotating around its second rotation axis that is different from the first rotation axis, so that the mixed material is uniformly mixed. Generally, if only the stirring section 110 is used to mix the mixed material, a phenomenon of particle adhesion may occur because effective dispersion cannot occur in a short time. The dispersion section 120 may include dispersion blades and may disperse the already bonded mixed material by generating a strong shear force when the dispersion blades rotate at high speed. In one embodiment, the dispersion blades may have a disk shape including serrated blades. When the dispersion blades rotate at high speed, strong turbulence may be formed locally, thereby providing (or imparting) a strong dispersion and crushing effect to the mixed material.

[0038] The driving unit 130 can provide a rotational force to the stirring unit 110 and the dispersing unit 120. The driving unit 130 can include a motor 131 and a rotation conversion unit 132. The motor 131 can provide a driving force. The rotation conversion unit 132 can convert the driving force of the motor 131 into a rotational force and a rotational force relative to the stirring unit 110 and the dispersing unit 120.

[0039] The container 140 may contain the slurry mixed by the stirring part 110 and the dispersing part 120. In one embodiment, the container 140 has a circular shape in a plane, so that the stirring part 110 and the dispersing part 120 can rotate and turn within the container 140.

[0040] The liquid providing portion may be provided in any one or more of the suspended ceiling, stirring portion 110, dispersing portion 120, and container 140 of the slurry mixing device 100, and may provide liquid. After the mixing is terminated (or completed), the liquid providing portion may ensure that the slurry residues that have adhered to the suspended ceiling, stirring portion 110, dispersing portion 120, and container 140 of the slurry mixing device 100 fall off. In one embodiment, the liquid may be water. A detergent may be added to the liquid. The liquid providing portion may be provided in a portion of any one or more of the suspended ceiling, stirring portion 110, dispersing portion 120, and container 140 of the slurry mixing device 100. In one embodiment, the liquid providing portion may be provided in the stirring portion 110 or the dispersing portion 120, and the slurry residues that have adhered to the stirring portion 110 or the dispersing portion 120 may fall off by using liquid. Furthermore, a liquid supply part may be provided at the ceiling of the slurry mixing device 100 or the bottom of the container 140 and may drop slurry residue adhering to the ceiling of the slurry mixing device 100 or the bottom of the container 140 by using liquid.

[0041] In one embodiment, the liquid supply portion may have a structure for supplying liquid to a surface. Figure 2 An example of the structure of the liquid supply section is described.

[0042] Figure 2 4 is a schematic cross-sectional view of a liquid supply portion of a slurry mixing device according to an embodiment of the present disclosure.

[0043] refer to Figure 2 The liquid supply unit 150 of the slurry mixing device 100 according to an embodiment of the present disclosure may include a liquid injection unit (e.g., a liquid injector) 151 and a flow channel 152. The liquid injection unit 151 may inject liquid toward (or onto) the surfaces of the stirring unit 110, the dispersing unit 120, and the container 140, so that slurry residues are removed by the liquid. The flow channel 152 may allow the liquid to flow on (or along) the flow channel, so that the liquid can be injected through the liquid injection unit 151.

[0044] The liquid supply unit 150 can remove slurry residues that are attached (or have been attached) to one or more of the stirring unit 110, the dispersion unit 120, and the container 140 by using liquid. Therefore, since the internal cleaning efficiency of the slurry mixing device 100 is improved, a cleaning process such as a separate manual cleaning process after the mixing is terminated can be omitted or minimized.

[0045] Figure 3 FIG. 1 is a schematic diagram illustrating a slurry mixing device including a residue removal portion according to an embodiment of the present disclosure.

[0046] refer to Figure 3 The slurry mixing device 100 according to an embodiment of the present disclosure may further include one or more residue removal units 160. The residue removal unit 160 may be provided in a suspended ceiling of the slurry mixing device 100 or a portion (e.g., area) of the container 140, and may remove slurry residue remaining on the upper portion of the slurry mixing device 100 or in the container 140.

[0047] In one embodiment, if two or more residue removal units 160 are provided, they may be spaced apart from each other at a first interval or greater, which can prevent the residue removal units 160 from being damaged due to mutual interference. For example, the distance between the residue removal units 160 may be approximately 1 cm or greater. In addition, the residue removal units 160 and the stirring unit 110, or the residue removal units 160 and the dispersion unit 120, may be spaced apart from each other at a second interval or greater, which can prevent the residue removal units 160 from being damaged due to interference with the stirring unit 110 or the dispersion unit 120. For example, the distance between the residue removal units 160 and the stirring unit 110, or between the residue removal units 160 and the dispersion unit 120, may be in the range of approximately 1 cm to approximately 5 cm.

[0048] In one embodiment, the residue removal unit 160 may include (or may be) a metal or silicon material. Figures 4A to 4E 、 Figure 5A and Figure 5B An example of the residue removing section 160 is described.

[0049] Figures 4A to 4E 1 is a schematic diagram illustrating an example of a rotating body as an example of a residue removing portion of a slurry mixing device according to an embodiment of the present disclosure.

[0050] Figures 4A to 4E The residue removal unit 160 of the slurry mixing device 100 according to an embodiment of the present disclosure is illustrated as an example of a rotating body. When the residue removal unit 160 is a rotating body, the residue removal unit 160 can remove slurry residue while rotating. Figures 4A to 4EThe rotating body may include two to six wings and can effectively remove slurry residues while rotating. If the number of wings is greater than six, the efficiency of removing slurry residues may be reduced because the slurry residues adhere to (e.g., become stuck between) the wings.

[0051] Figure 5A and Figure 5B FIG. 1 is a schematic diagram illustrating an example of an auxiliary blade as a residue removing portion of a slurry mixing device according to an embodiment of the present disclosure.

[0052] Figure 5A and Figure 5B The residue removal unit 160 of the slurry mixing device 100 according to one embodiment of the present disclosure is exemplified as an auxiliary blade. When the residue removal unit 160 is an auxiliary blade, the residue removal unit 160 can remove slurry residue while performing a reciprocating motion. In such an embodiment, Figure 5A As shown in the example, the auxiliary blade can reciprocate around its rotation axis, or as Figure 5B As illustrated in FIG, reciprocating motion (eg, linear reciprocating motion) can be performed along its track.

[0053] Figure 6 FIG. 1 is a schematic diagram illustrating a slurry mixing device including a plurality of dispersing blades according to an embodiment of the present disclosure.

[0054] refer to Figure 6 The dispersion part 120 of the slurry mixing device 100 according to an embodiment of the present disclosure may include a plurality of dispersion blades 121 . Figure 6 An embodiment is illustrated in which the number of the dispersion blades 121 is four. The dispersion portion 120 may include a plurality of dispersion blades 121, thereby improving or maximizing dispersion efficiency because the dispersion blades 121 rotate at a high speed and increase the volume of the slurry mixed together.

[0055] Figure 7 FIG. 1 is a schematic diagram illustrating a slurry mixing device including dispersing blades having different diameters according to an embodiment of the present disclosure.

[0056] refer to Figure 7According to an embodiment of the present disclosure, the multiple dispersion blades 121 of the dispersion section 120 of the slurry mixing device 100 can have different diameters from each other. In such an embodiment, due to the different diameters of the dispersion blades 121, the dispersion efficiency at the same revolutions per minute (RPM) can be improved or maximized by different distances between the stirring section 110 and each of the dispersion blades 121. In one embodiment, the diameter of each of the dispersion blades 121 can increase from its upper portion toward its lower portion. Generally, the stirring blades of the stirring section 110 can have a spiral shape that narrows from its upper portion toward its lower portion. Therefore, when the diameter of each of the dispersion blades 121 increases from its upper portion toward its lower portion, the dispersion efficiency can be improved. In one embodiment, the ratio of the diameter of the highest dispersion blade 121 to the diameter of the lowest dispersion blade 121 among the dispersion blades 121 can be in the range of about 1:1 to about 1:10. If the diameter of the lowest dispersion blade 121 exceeds the above ratio, it may interfere with the stirring blades of the stirring section 110.

[0057] Hereinafter, materials that can be used in the slurry mixed in the slurry mixing apparatus according to an embodiment of the present disclosure will be described.

[0058] A compound capable of reversibly intercalating and deintercalating lithium (e.g., a lithiated intercalation compound) can be used as the positive electrode active material. For example, one or more types selected from a composite oxide of a metal (the metal being selected from cobalt, manganese, nickel, and combinations thereof) and lithium can be used as the positive electrode active material.

[0059] The composite oxide may be a lithium transition metal composite oxide. Detailed examples of the composite oxide may include lithium nickel-based oxides, lithium cobalt-based oxides, lithium manganese-based oxides, ferrous phosphate-based compounds, cobalt-free nickel manganese-based oxides, or combinations thereof.

[0060] For example, a compound represented by one of the following chemical formulas can be used. 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 b O2(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).

[0061] In the above chemical formula: A can be Ni, Co, Mn, or a combination thereof. X can be Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, a rare earth element, 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 may be Mn, Al or a combination thereof.

[0062] A positive electrode for a lithium secondary battery may include a positive electrode current collector and a positive electrode active material layer formed on the positive electrode current collector. The positive electrode active material layer may include a positive electrode active material and may include a binder and / or a conductive material.

[0063] The content of the positive electrode active material may be in the range of about 90 wt.% to about 99 wt.% relative to 100 wt.% of the positive electrode active material layer. The content of the binder and the conductive material may each be in the range of about 0.5 wt.% to about 5 wt.% relative to 100 wt.% of the positive electrode active material layer.

[0064] An Al foil may be used as the positive electrode current collector, but the present disclosure is not limited thereto.

[0065] The negative electrode active material may include a material capable of reversibly intercalating / deintercalating lithium ions, lithium metal, a lithium metal alloy, a material capable of doping and dedoping lithium, or a transition metal oxide.

[0066] The material capable of reversibly intercalating / deintercalating lithium ions may include a carbon-based negative electrode active material, for example, crystalline carbon, amorphous carbon, or a combination thereof. Examples of crystalline carbon may include graphite, such as natural graphite or synthetic graphite. Examples of amorphous carbon may include soft carbon, hard carbon, mesophase pitch carbide, and coke.

[0067] Si-based negative electrode active materials or Sn-based negative electrode active materials can be used as materials capable of doping and dedoping lithium. Si-based negative electrode active materials can be silicon, silicon-carbon composites, SiO x (0<x≤2), Si-based alloys or combinations thereof.

[0068] The silicon-carbon composite may be a composite of silicon and amorphous carbon. According to an embodiment, the silicon-carbon composite may include silicon particles, and may be in a form in which amorphous carbon has been coated on the surface of the silicon particles.

[0069] The silicon-carbon composite may further include crystalline carbon. For example, the silicon-carbon composite may include a core including crystalline carbon and silicon particles and an amorphous carbon coating disposed on a surface of the core.

[0070] The negative electrode for a lithium secondary battery may include a negative electrode current collector and a negative electrode active material layer disposed on the negative electrode current collector. The negative electrode active material layer may include a negative electrode active material and may include a binder and / or a conductive material.

[0071] For example, the negative electrode active material layer may include a negative electrode active material in a range of about 90 wt.% to about 99 wt.%, a binder in a range of about 0.5 wt.% to about 5 wt.%, and a conductive material in a range of about 0 wt.% to about 5 wt.%.

[0072] A non-aqueous binder, an aqueous binder, a dry binder, or a combination thereof may be used as the binder. If an aqueous binder is used as the binder for the negative electrode, the binder for the negative electrode may further include a cellulose compound capable of determining viscosity.

[0073] One selected from nickel foil, stainless steel foil, titanium foil, nickel foam, copper foam, a polymer substrate on which a conductive metal has been coated, and a combination thereof may be used as the negative electrode current collector.

[0074] Although the present disclosure has been described above in conjunction with some embodiments of the present disclosure, the present disclosure is not limited to these embodiments. A person with ordinary knowledge in the field to which the present disclosure belongs can modify and change the present disclosure within the technical spirit of the present disclosure defined by the claims and their equivalents.

Claims

1. A slurry mixing device comprising: an agitator in the suspended ceiling of the slurry mixing apparatus and configured to rotate about its rotation axis while rotating about its first rotation axis; a disperser in the suspended ceiling of the slurry mixing device and configured to rotate about the rotation axis while rotating about a second rotation axis different from the first rotation axis; a driver configured to provide rotational force to the agitator and the disperser; a container configured to contain the slurry mixed by the agitator and the disperser; as well as A liquid supply portion is in at least one of the suspended ceiling, the stirrer, the disperser, and the container, and is configured to supply liquid.

2. The slurry mixing device according to claim 1, wherein the liquid supply portion comprises: a liquid injector configured to inject the liquid toward at least one of the agitator, the disperser, and the container; as well as A flow channel along which the liquid is configured to flow.

3. The slurry mixing device according to claim 1 further comprises a residue removing portion, which is in the suspended top or in the container and is configured to remove slurry residue remaining on the upper portion of the slurry mixing device or in the container, respectively.

4. The slurry mixing device according to claim 3, wherein the residue removing portion is a rotating body configured to remove the slurry residue while rotating, or an auxiliary blade configured to remove the slurry residue while performing a reciprocating motion. The slurry mixing device according to claim 4 , wherein the rotating body comprises two to six wings. The slurry mixing device according to claim 3 , wherein the residue removing portion comprises a plurality of residue removing portions spaced apart from each other at a first interval or greater. 7 . The slurry mixing device according to claim 3 , wherein the residue removing portion is spaced apart from the agitator or the disperser at a second interval or greater. The slurry mixing device according to claim 3 , wherein the residue removing part comprises a metal or silicon material. 9 . The slurry mixing apparatus according to claim 1 , wherein the agitator comprises a stirring blade having a spiral configuration twisted in a vertical direction.

10. The slurry mixing device of claim 1, wherein the disperser comprises a plurality of dispersion blades. The slurry mixing device according to claim 10 , wherein the plurality of dispersion blades have different diameters from each other. 12 . The slurry mixing device according to claim 10 , wherein a diameter of each of the plurality of dispersion blades increases from an upper portion thereof toward a lower portion thereof. 13 . The slurry mixing device according to claim 10 , wherein a ratio of a diameter of a highest dispersion blade among the plurality of dispersion blades to a diameter of a lowest dispersion blade among the plurality of dispersion blades is in a range of 1:1 to 1:10.

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