A slurry stirring device, electrode slurry and preparation method and application thereof

Abstract

The present invention provides a slurry stirring device, an electrode slurry, and a preparation method and application thereof, wherein the slurry stirring device comprises a stirring container, wherein a planetary stirring paddle is arranged in the stirring container, wherein a disperser is integrated inside the planetary stirring paddle, and the slurry stirring device further comprises a lifting controller connected to the disperser, and a driver connected to the disperser and the planetary stirring paddle; the lifting controller is used to control the disperser to be lifted and lowered along the axial direction of the planetary stirring paddle, and the driver is used to control the disperser and the planetary stirring paddle to rotate. The slurry stirring device provided by the present invention can effectively reduce the dead angle of the kneading process of the equipment by adopting a disperser that can be freely lifted and lowered integrated in the planetary stirring paddle, compared with the existing double planetary or planetary dispersed equipment, improve the kneading efficiency and the overall dispersion uniformity of the final slurry; compared with the existing three-planetary equipment, the dilution capacity after kneading is significantly improved, and the preparation time of the slurry is shortened.

Description

Technical Field

[0001] The invention belongs to the technical field of batteries and relates to a slurry stirring device, in particular to a slurry stirring device, electrode slurry and a preparation method and application thereof. Background Art

[0002] Planetary power mixer is a kind of high-efficiency mixing equipment, which is suitable for the processes of liquid-liquid mixing, liquid-solid mixing, dispersion, homogenization and emulsification of lithium-ion battery electrode slurry, adhesives, inks, pigments and cosmetics. Planetary power mixers in the prior art generally adopt planetary gear transmission and are equipped with low-speed stirring components or high-speed dispersion components. The low-speed stirring component adopts planetary gear transmission, and the stirring paddle also rotates while revolving, so that the material can achieve the ideal mixing effect in a shorter time; the high-speed dispersion component revolves with the planetary frame and rotates at high speed at the same time, so that the material is mixed through strong shearing and dispersion. According to the number of low-speed stirring components of the mixer and whether it contains high-speed dispersion components, the planetary power mixers in the lithium-ion battery industry are generally divided into: double planetary type, triple planetary type or planetary dispersion type. In the existing lithium-ion battery dry slurry production process, the "dry mixing-kneading-dilution" method is generally adopted, in which the active material, conductive agent and binder mixture composed of different particle sizes are first "dry mixed", then a certain amount of liquid is added for "kneading", and finally the mixed slurry is "diluted" to a slurry with a suitable solid content by adding the remaining required liquid. In the kneading process of the double planetary and planetary dispersed equipment, a dead angle is formed between the running track of the stirring paddle and the stirring tank. The slurry in the dead angle is difficult to be fully kneaded and mixed. At the same time, during the kneading process, The slurry is generally in a clay state. At this time, the dispersion shaft of the planetary disperser not only cannot disperse the slurry, but also hinders the flow of slurry in the mixing tank due to its existence, further deteriorating the kneading ability of the mixing equipment and prolonging the working time of the equipment; although the three-planetary mixer effectively reduces the dead angle in the kneading process by increasing the number of stirring paddles, it cancels the design of the dispersion shaft. During the dilution process after kneading, it is difficult to quickly and efficiently dilute the kneaded clay-like slurry, which prolongs the working time of the equipment.

[0003] CN101785978A discloses a method for manufacturing slurry, in which three or more stirring blades are arranged in a stirring tank (stirring tank) to perform planetary motion in opposite directions of revolution and rotation, so that slurry can be manufactured efficiently in a short time with less power, and no large cooling system is required. However, although the method eliminates the dead zone phenomenon caused by the use of two stirring blades with the same revolution direction and rotation direction in the traditional stirrer by arranging three or more stirring blades in the stirring tank, thereby achieving the purpose of reducing the amount of kneading liquid and shortening the dispersion time, the method only uses the stirring blades for kneading and the subsequent dispersion process to prepare the slurry. For mixtures with large differences in physical properties or easy to agglomerate, the overall efficiency is low during the dilution process, and the dilution time of the equipment needs to be extended, which cannot effectively shorten the entire slurry preparation process.

[0004] The currently disclosed slurry stirring devices all have certain defects. There is a dead angle between the running track of the stirring paddle and the stirring tank. The slurry in the dead angle is difficult to be fully kneaded and mixed. In addition, during the kneading process of preparing battery slurry using the slurry stirring device, the slurry is in a clay state, making it difficult to disperse the slurry, and the slurry preparation efficiency is low. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a slurry stirring device, an electrode slurry, and a preparation method and application thereof. The slurry stirring device provided by the present invention, by adopting a method of integrating a freely rising and falling disperser in a planetary stirring paddle, can effectively reduce the dead angle of the equipment kneading process compared with the existing double planetary or planetary dispersed equipment, thereby improving the kneading efficiency and thus improving the overall dispersion uniformity of the final slurry; compared with the existing three-planetary equipment, the dilution capacity after kneading is significantly improved, and the preparation time of the slurry can be shortened while ensuring that the slurry obtains the same dispersion effect.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a slurry stirring device, the slurry stirring device comprising a stirring container, a planetary stirring paddle is arranged in the stirring container, a disperser is integrated inside the planetary stirring paddle, the slurry stirring device further comprises a lifting controller connected to the disperser, and a driver connected to the disperser and the planetary stirring paddle;

[0008] The lifting controller is used to control the disperser to be lifted and lowered along the axial direction of the planetary stirring paddle, and the driver is used to control the disperser and the planetary stirring paddle to rotate.

[0009] The driver of the present invention includes but is not limited to the servo motor in the prior art, and the function of the driver is to control the rotation and revolution of the planetary stirring blade and control the rotation of the disperser.

[0010] The slurry stirring device provided by the present invention can effectively reduce the dead angle of the kneading process of the equipment, improve the kneading efficiency and thus improve the overall dispersion uniformity of the final slurry, by integrating a freely rising and falling disperser in a planetary stirring paddle, compared with existing double planetary or planetary dispersed equipment.

[0011] The slurry stirring device provided by the present invention adopts a method of integrating a freely rising and falling disperser in a planetary stirring paddle, which significantly improves the dilution capacity after kneading compared with the existing three-planetary equipment, and can shorten the preparation time of the slurry while ensuring that the slurry obtains the same dispersion effect.

[0012] Preferably, the planetary stirring paddle includes stirring blades and a stirring transmission shaft which is arranged on the shoulder of the planetary stirring paddle and fixedly connected to the stirring blades, the stirring transmission shaft is connected to the driver, and a through hole is arranged on the stirring transmission shaft.

[0013] The stirring transmission shaft of the present invention is connected to the driver, and the connection method is not limited, as long as the driver can smoothly drive the stirring transmission shaft to rotate.

[0014] Preferably, the disperser comprises a dispersion disk and a dispersion transmission shaft fixedly connected to the dispersion disk, and the dispersion transmission shaft is connected to the driver after passing through a through hole.

[0015] The dispersed transmission shaft of the present invention is connected to the driver in any manner, as long as the driver can smoothly drive the dispersed transmission shaft to rotate.

[0016] Preferably, the inner diameter of the through hole is larger than the outer diameter of the dispersed transmission shaft.

[0017] In the present invention, the inner diameter of the through hole is larger than the outer diameter of the dispersion transmission shaft, and the dispersion transmission shaft and the stirring transmission shaft do not contact each other and operate independently.

[0018] Preferably, the dispersion disk is arranged on the axis of the stirring blade and is located between the crossbeam and the shoulder of the planetary stirring blade.

[0019] In a second aspect, the present invention provides a method for preparing electrode slurry using the slurry stirring device according to the first aspect, the method comprising:

[0020] (1) a driver controls the planetary stirring blade to rotate and revolve, and the disperser rotates to mix the solid components of the electrode slurry in the stirring container to obtain a first mixed material;

[0021] (2) the lifting controller controls the disperser to rise and then leave the first mixed material, and adds the first liquid component of the electrode slurry to the first mixed material at least once, and the driver controls the planetary stirring blade to rotate and revolve after each addition of the first liquid component of the electrode slurry to obtain a second mixed material;

[0022] (3) The lifting controller controls the disperser to descend and enter the second mixture, and adds the second liquid component of the electrode slurry to the second mixture at least once. After each addition of the second liquid component of the electrode slurry, the driver controls the planetary stirring blade to rotate and revolve, and the disperser rotates to obtain the electrode slurry.

[0023] The method of preparing electrode slurry using the slurry stirring device in the present invention can not only improve the kneading efficiency, but also reduce the amount of liquid added during the slurry kneading and dilution process. The solid content of the slurry prepared by the method is also increased accordingly, thereby reducing the preparation cost of the slurry.

[0024] The electrode slurry prepared by the method of the present invention has high uniformity and dispersion, so that the content ratio of active material in the slurry prepared by the slurry stirring device can be increased while obtaining the same electrode sheet conductivity, thereby improving the energy density of the electrode sheet prepared by the electrode slurry.

[0025] Preferably, the electrode slurry in step (1) includes positive electrode slurry or negative electrode slurry.

[0026] The solid components of the positive electrode slurry described in the present invention include positive electrode active material, positive electrode conductor and positive electrode binder, the positive electrode active material includes lithium iron phosphate, the positive electrode conductor includes conductive carbon black, the binder includes polyvinylidene fluoride, and the mass ratio of lithium iron phosphate, conductive carbon black and polyvinylidene fluoride is 94.5:2:3.5; the liquid component of the positive electrode slurry includes N-methylpyrrolidone.

[0027] The solid components of the negative electrode slurry described in the present invention include a negative electrode active material, a negative electrode conductor and a negative electrode dispersant; the negative electrode active material includes graphite, the negative electrode conductor includes conductive carbon black, the negative electrode dispersant includes sodium carboxymethyl cellulose, the mass ratio of the graphite, conductive carbon black and sodium carboxymethyl cellulose is 96:1:1, and the liquid components of the negative electrode slurry include a negative electrode binder and / or deionized water, and the negative electrode binder includes styrene-butadiene rubber.

[0028] Preferably, in step (1), the planetary agitator has an autorotation speed of 7 to 13 m / s, an orbital speed of 2 to 7 m / s, and a time of 20 to 60 min.

[0029] The rotation speed of the planetary agitator in step (1) of the present invention is 7 to 13 m / s, for example, it can be 7 m / s, 8 m / s, 9 m / s, 10 m / s, 11 m / s, 12 m / s or 13 m / s, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0030] The planetary agitator in step (1) of the present invention has a revolution speed of 2 to 7 m / s, for example, 2 m / s, 3 m / s, 4 m / s, 5 m / s, 6 m / s or 7 m / s, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0031] The time for the rotation and revolution of the planetary agitator in step (1) of the present invention is 20 to 60 minutes, for example, it can be 20 minutes, 25 minutes, 30 minutes, 35 minutes, 40 minutes, 45 minutes, 50 minutes, 55 minutes or 60 minutes, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0032] Preferably, the disperser in step (1) rotates at a speed of 18 to 23 m / s for a time of 20 to 60 min.

[0033] The speed of the disperser in step (1) of the present invention is 18 to 23 m / s, for example, 18 m / s, 18.5 m / s, 19 m / s, 19.5 m / s, 20 m / s, 20.5 m / s, 21 m / s, 21.5 m / s, 22 m / s, 22.5 m / s or 23 m / s, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0034] The time for the disperser to rotate in step (1) of the present invention is 20 to 60 minutes, for example, 20 minutes, 25 minutes, 30 minutes, 35 minutes, 40 minutes, 45 minutes, 50 minutes, 55 minutes or 60 minutes, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0035] Preferably, the method further comprises standing for 5 to 30 minutes between step (1) and step (2), for example, 5 minutes, 10 minutes, 12 minutes, 20 minutes, 25 minutes or 30 minutes, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0036] Preferably, the rotation and revolution of the planetary agitator in step (2) are divided into at least one stage, and in each stage the rotation speed of the planetary agitator is independently 15 to 45 m / s, the revolution speed is independently 5 to 15 m / s, and the time is independently 20 to 90 min.

[0037] In the step (2) of the present invention, the rotation and revolution of the planetary agitator impeller are divided into at least one stage, and the rotation speed of the planetary agitator impeller in each stage is independently 15 to 45 m / s, for example, it can be 15 m / s, 20 m / s, 25 m / s, 30 m / s, 35 m / s, 40 m / s or 45 m / s, but it is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0038] In the step (2) of the present invention, the rotation and revolution of the planetary agitator impeller are divided into at least one stage, and the rotation speed of the planetary agitator impeller revolution in each stage is independently 5 to 15 m / s, for example, it can be 5 m / s, 6 m / s, 7 m / s, 8 m / s, 9 m / s, 10 m / s, 11 m / s, 12 m / s, 13 m / s, 14 m / s or 15 m / s, but it is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0039] The rotation and revolution of the planetary agitator in step (2) of the present invention are divided into at least one stage, and the time of each stage is 20 to 90 minutes, for example, it can be 20 minutes, 30 minutes, 40 minutes, 50 minutes, 60 minutes, 70 minutes, 80 minutes or 90 minutes, but it is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0040] Preferably, the solid content of the second mixture in step (2) is 60% to 85%, for example, it can be 60%, 65%, 70%, 75%, 80% or 85%, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0041] Preferably, in step (3), the disperser reaches the center position between the crossbeam and the blade shoulder of the planetary agitator after descending.

[0042] Preferably, in step (3), the planetary agitator has an autorotation speed of 15 to 30 m / s, an orbital speed of 5 to 10 m / s, and a time of 20 to 90 min.

[0043] The rotation speed of the planetary agitator in step (3) of the present invention is 15 to 30 m / s, for example, 15 m / s, 20 m / s, 25 m / s or 30 m / s, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0044] The planetary agitator in step (3) of the present invention has a revolution speed of 5 to 10 m / s, for example, 5 m / s, 6 m / s, 7 m / s, 8 m / s, 9 m / s or 10 m / s, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0045] The time for the rotation and revolution of the planetary agitator in step (3) of the present invention is 20 to 90 minutes, for example, it can be 20 minutes, 30 minutes, 40 minutes, 50 minutes, 60 minutes, 70 minutes, 80 minutes or 90 minutes, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0046] Preferably, the disperser in step (3) rotates at a speed of 18 to 23 m / s for a time of 20 to 90 min.

[0047] The rotation speed of the disperser in step (3) of the present invention is 18 to 23 m / s, for example, 18 m / s, 19 m / s, 20 m / s, 21 m / s, 22 m / s or 23 m / s, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0048] The time for the disperser to rotate in step (3) of the present invention is 20 to 90 minutes, for example, 20 minutes, 30 minutes, 40 minutes, 50 minutes, 60 minutes, 70 minutes, 80 minutes or 90 minutes, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0049] Preferably, the viscosity of the electrode slurry in step (3) is 4000-30000cp, for example, it can be 4000cp, 5000cp, 6000cp, 8000cp, 10000cp, 12000cp, 14000cp, 16000cp, 18000cp, 20000cp, 22000cp, 24000cp, 26000cp, 28000cp or 30000cp, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0050] Preferably, the solid content of the electrode slurry in step (3) is 50-80%, for example, it can be 50%, 55%, 60%, 65%, 70%, 75% or 80%, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0051] Preferably, step (3) further comprises degassing the electrode slurry.

[0052] Preferably, the deaeration includes a driver controlling the rotation and revolution of a planetary agitator, the rotation speed is 9 to 18 m / s, the revolution speed is 3 to 6 m / s, and the time is 5 to 40 min. During the deaeration process, the rotation and revolution of the planetary agitator are reversed.

[0053] The deaeration described in the present invention includes a driver controlling the rotation and revolution of a planetary agitator, and the rotation speed is 9 to 18 m / s, for example, it can be 9 m / s, 10 m / s, 11 m / s, 12 m / s, 13 m / s, 14 m / s, 15 m / s, 16 m / s, 17 m / s or 18 m / s, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0054] The deaeration described in the present invention includes a driver controlling the rotation and revolution of a planetary agitator, and the revolution speed is 3 to 6 m / s, for example, it can be 3 m / s, 3.5 m / s, 4 m / s, 4.5 m / s, 5 m / s, 5.5 m / s or 6 m / s, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0055] The deaeration described in the present invention includes a driver controlling the rotation and revolution of a planetary agitator, and the rotation and revolution time is 5 to 40 minutes, for example, it can be 5 minutes, 10 minutes, 15 minutes, 20 minutes, 25 minutes, 30 minutes, 35 minutes or 40 minutes, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0056] During the deaeration process of the present invention, the rotation and revolution of the planetary agitator paddle are both reversed, and the reversal is opposite to the direction of the rotation and revolution of the planetary agitator paddle in other steps except the deaeration step. If the other steps rotate clockwise, it is reversed to counterclockwise, and if the other steps rotate counterclockwise, it is reversed to clockwise.

[0057] In a third aspect, the present invention provides an electrode slurry, which is obtained by the method described in the second aspect.

[0058] In a fourth aspect, the present invention provides a lithium-ion battery, wherein the lithium-ion battery comprises the electrode slurry described in the third aspect.

[0059] In a fifth aspect, the present invention provides a vehicle, comprising the lithium-ion battery described in the fourth aspect.

[0060] Compared with the prior art, the present invention has the following beneficial effects:

[0061] (1) The slurry stirring device provided by the present invention adopts a method of integrating a freely lifting disperser in a planetary stirring paddle, which can effectively reduce the dead angle of the kneading process of the device, improve the kneading efficiency, and thus improve the overall dispersion uniformity of the final slurry compared to the existing double planetary or planetary dispersed equipment;

[0062] (2) The slurry stirring device provided by the present invention adopts a method of integrating a freely rising and falling disperser in a planetary stirring blade, which significantly improves the dilution capacity after kneading compared with the existing three-planetary equipment, and can shorten the slurry preparation time while ensuring that the slurry obtains the same dispersion effect;

[0063] (3) The method of preparing electrode slurry using the slurry stirring device in the present invention can not only improve the kneading efficiency, but also reduce the amount of liquid added during the slurry kneading and dilution process. The solid content of the slurry prepared by the method is also increased accordingly, thereby reducing the preparation cost of the slurry;

[0064] (4) The electrode slurry prepared by the method of the present invention has high uniformity and dispersion, so that the content ratio of active material in the slurry prepared by the slurry stirring device can be increased while obtaining the same electrode sheet conductivity, thereby improving the energy density of the electrode sheet prepared by the electrode slurry. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 It is a schematic structural diagram of a slurry stirring device according to a specific embodiment of the present invention.

[0066] Among them, 1-planetary stirring paddle; 2-disperser; 3-stirring blade; 4-paddle shoulder; 5-stirring transmission shaft; 6-through hole; 7-dispersing disk; 8-dispersing transmission shaft; 9-crossbeam. DETAILED DESCRIPTION

[0067] It should be understood that, in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0068] It should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0069] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0070] In a specific embodiment, Figure 1 As shown, the present invention provides a slurry stirring device, the slurry stirring device comprises a stirring container (not shown in the figure), a planetary stirring paddle 1 is arranged in the stirring container, a disperser 2 is integrated inside the planetary stirring paddle 1, the slurry stirring device further comprises a lifting controller (not shown in the figure) connected to the disperser 2, and a driver (not shown in the figure) connected to the disperser 2 and the planetary stirring paddle 1;

[0071] The lifting controller is used to control the disperser 2 to be lifted and lowered along the axial direction of the planetary stirring blade 1, and the driver is used to control the disperser 2 and the planetary stirring blade 1 to rotate.

[0072] Furthermore, the planetary stirring paddle 1 includes a stirring blade 3 and a stirring transmission shaft 5 which is arranged on a blade shoulder 4 of the planetary stirring paddle 1 and fixedly connected to the stirring blade 3 , the stirring transmission shaft 5 is connected to a driver, and a through hole 6 is arranged on the stirring transmission shaft 5 .

[0073] Furthermore, the disperser 2 includes a dispersion disk 7 and a dispersion transmission shaft 8 fixedly connected to the dispersion disk 7, and the dispersion transmission shaft 8 is connected to the driver after passing through the through hole 6.

[0074] Furthermore, the inner diameter of the through hole 6 is larger than the outer diameter of the dispersed transmission shaft 8 .

[0075] Furthermore, the dispersion disk 7 is arranged on the axis of the stirring blade 3 and is located between the blade shoulder 4 and the crossbeam 9 of the planetary stirring blade 1 .

[0076] Example 1

[0077] This embodiment provides a method for preparing electrode slurry using the slurry stirring device, the method comprising:

[0078] (1) The driver controls the planetary stirring blade 1 to rotate at a speed of 10.5 m / s and to revolve at a speed of 3.5 m / s for 30 min, and the disperser 2 to rotate at a speed of 23 m / s for 30 min, and lithium iron phosphate, conductive carbon black and polyvinylidene fluoride in a mass ratio of 94.5:2:3.5 are mixed in a stirring container to obtain a first mixed material, and then the mixture is allowed to stand for 10 min;

[0079] (2) The lifting controller controls the disperser 2 to rise and then leave the first mixture, and N-methylpyrrolidone is added to the first mixture. The driver controls the planetary stirring blade 1 to rotate and revolve. The rotation and revolution of the planetary stirring blade 1 are divided into two stages. In the first stage, the rotation speed of the planetary stirring blade 1 is 22.5 m / s, the revolution speed is 7.5 m / s, and the time is 20 min. In the second stage, the rotation speed of the planetary stirring blade 1 is 34.5 m / s, the revolution speed is 11.5 m / s, and the time is 40 min. N-methylpyrrolidone is added again, and the driver controls the rotation and revolution of the planetary stirring blade 1. The rotation speed of the planetary stirring blade 1 is 34.5 m / s, the revolution speed is 11.5 m / s, and the time is 60 min. A second mixture with a solid content of 69.32% is obtained;

[0080] (3) The lifting controller controls the disperser 2 to descend to the center position between the blade shoulder 4 and the crossbeam 9 of the planetary stirring blade 1, thereby entering the second mixture, adding N-methylpyrrolidone to the second mixture, and the driver controls the planetary stirring blade 1 to rotate at a speed of 22.5 m / s and revolve at a speed of 7.5 m / s for 40 min, and the disperser 2 rotates at a speed of 23 m / s for 40 min. Then, N-methylpyrrolidone is added, and the driver controls the planetary stirring blade 1 to rotate at a speed of 22.5 m / s and revolve at a speed of 7.5 m / s for 20 min, and the disperser 2 rotates at a speed of 23 m / s for 20 min, to obtain an electrode slurry with a viscosity of 5000 cp and a solid content of 56.5%. The driver controls the planetary stirring blade 1 to rotate at a speed of 13.5 m / s and revolve at a speed of 4.5 m / s to reverse and degas the electrode slurry for 10 minutes.

[0081] The fineness of the electrode slurry prepared in this embodiment is 20 microns, the anti-settling time is 30 hours, and the total slurry preparation time is 230 minutes.

[0082] Example 2

[0083] This embodiment provides a method for preparing electrode slurry using the slurry stirring device, the method comprising:

[0084] (1) The driver controls the planetary stirring blade 1 to rotate at a speed of 7 m / s and revolve at a speed of 2 m / s for 20 min, and the disperser 2 to rotate at a speed of 18 m / s for 20 min, and mixes graphite, conductive carbon black and sodium carboxymethyl cellulose in a mass ratio of 96:1:1 in a stirring container to obtain a first mixed material and then let it stand for 30 min;

[0085] (2) The lifting controller controls the disperser 2 to rise and leave the first mixture, and deionized water is added to the first mixture. The driver controls the planetary stirring blade 1 to rotate and revolve. The rotation and revolution of the planetary stirring blade 1 are divided into two stages. In the first stage, the rotation speed of the planetary stirring blade 1 is 15 m / s, the revolution speed is 5 m / s, and the time is 40 min. In the second stage, the rotation speed of the planetary stirring blade 1 is 24 m / s, the revolution speed is 8 m / s, and the time is 90 min. Deionized water is added again, and the driver controls the rotation and revolution of the planetary stirring blade 1. The rotation speed of the planetary stirring blade 1 is 45 m / s, the revolution speed is 15 m / s, and the time is 30 min. A second mixture with a solid content of 60% is obtained;

[0086] (3) The lifting controller controls the disperser 2 to descend to the center position between the blade shoulder 4 and the crossbeam 9 of the planetary stirring blade 1, so as to enter the second mixture, and deionized water is added to the second mixture. The driver controls the planetary stirring blade 1 to rotate at a speed of 15 m / s and revolve at a speed of 5 m / s for 90 min, and the disperser 2 rotates at a speed of 18 m / s for 90 min. Then, a styrene-butadiene rubber aqueous solution is added, and the mass ratio of styrene-butadiene rubber in the styrene-butadiene rubber aqueous solution to the mass ratio of graphite in the second mixture is 2:96. The driver controls the planetary stirring blade 1 to rotate at a speed of 30 m / s and revolve at a speed of 10 m / s for 30 min, and the disperser 2 rotates at a speed of 18 m / s for 30 min, to obtain an electrode slurry with a viscosity of 4000 cp and a solid content of 50%. The driver controls the planetary stirring blade 1 to rotate at a speed of 9 m / s and revolve at a speed of 3 m / s to reverse and degas the electrode slurry for 5 minutes.

[0087] The fineness of the electrode slurry prepared in this embodiment is 30 microns, the anti-settling time is 15 hours, and the total slurry preparation time is 335 minutes.

[0088] Example 3

[0089] This embodiment provides a method for preparing electrode slurry using the slurry stirring device, the method comprising:

[0090] (1) The driver controls the planetary stirring blade 1 to rotate at a speed of 13 m / s and revolve at a speed of 7 m / s for 60 min, and the disperser 2 to rotate at a speed of 18 m / s for 60 min, and lithium iron phosphate, conductive carbon black and polyvinylidene fluoride in a mass ratio of 94.5:2:3.5 are mixed in a stirring container to obtain a first mixed material, and then the mixture is allowed to stand for 5 min;

[0091] (2) The lifting controller controls the disperser 2 to rise and leave the first mixture, and N-methylpyrrolidone is added to the first mixture. The driver controls the planetary stirring blade 1 to rotate and revolve. The rotation and revolution of the planetary stirring blade 1 are divided into two stages. In the first stage, the rotation speed of the planetary stirring blade 1 is 15 m / s, the revolution speed is 5 m / s, and the time is 90 min. In the second stage, the rotation speed of the planetary stirring blade 1 is 30 m / s, the revolution speed is 10 m / s, and the time is 50 min. N-methylpyrrolidone is added again, and the driver controls the rotation and revolution of the planetary stirring blade 1. The rotation speed of the planetary stirring blade 1 is 45 m / s, the revolution speed is 15 m / s, and the time is 20 min. A second mixture with a solid content of 85% is obtained;

[0092] (3) The lifting controller controls the disperser 2 to descend to the center position between the blade shoulder 4 and the crossbeam 9 of the planetary stirring blade 1, thereby entering the second mixture, adding N-methyl pyrrolidone to the second mixture, and the driver controls the planetary stirring blade 1 to rotate at a speed of 18 m / s and revolve at a speed of 6 m / s for 50 min, and the disperser 2 rotates at a speed of 23 m / s for 50 min. Then, N-methyl pyrrolidone is added, and the driver controls the planetary stirring blade 1 to rotate at a speed of 24 m / s and revolve at a speed of 8 m / s for 90 min, and the disperser 2 rotates at a speed of 23 m / s for 90 min, to obtain an electrode slurry with a viscosity of 30,000 cp and a solid content of 80%. The driver controls the planetary stirring blade 1 to rotate at a speed of 18 m / s and revolve at a speed of 6 m / s to reverse and degas the electrode slurry for 40 minutes.

[0093] The fineness of the electrode slurry prepared in this embodiment is 20 microns, the anti-settling time is 31 hours, and the total slurry preparation time is 405 minutes.

[0094] Comparative Example 1

[0095] This comparative example provides a method for preparing electrode slurry using a double planetary stirring device, the method comprising:

[0096] (1) a driver controls a planetary stirring blade to rotate at a speed of 10.5 m / s and to revolve at a speed of 3.5 m / s for 60 min, and lithium iron phosphate, conductive carbon black and polyvinylidene fluoride are mixed in a mixing container at a mass ratio of 94.5:2:3.5 to obtain a first mixed material, and then the mixture is allowed to stand for 10 min;

[0097] (2) N-methylpyrrolidone is added to the first mixture, and the driver controls the rotation and revolution of the planetary stirring paddle. The rotation and revolution of the planetary stirring paddle are divided into two stages. In the first stage, the rotation speed of the planetary stirring paddle is 22.5 m / s, the revolution speed is 7.5 m / s, and the time is 40 min. In the second stage, the rotation speed of the planetary stirring paddle is 34.5 m / s, the revolution speed is 11.5 m / s, and the time is 80 min. N-methylpyrrolidone is added again, and the driver controls the rotation and revolution of the planetary stirring paddle. The rotation speed of the planetary stirring paddle is 34.5 m / s, the revolution speed is 11.5 m / s, and the time is 120 min, to obtain a second mixture with a solid content of 65.32%;

[0098] (3) N-methylpyrrolidone was added to the second mixture, and the driver controlled the planetary stirring paddle to rotate at a speed of 22.5 m / s and revolve at a speed of 7.5 m / s for 80 min. Then, N-methylpyrrolidone was added again, and the driver controlled the planetary stirring paddle to rotate at a speed of 22.5 m / s and revolve at a speed of 7.5 m / s for 40 min to obtain an electrode slurry with a viscosity of 6000 cp and a solid content of 51.5%. The driver controlled the planetary stirring paddle to rotate at a speed of 13.5 m / s and revolve at a speed of 4.5 m / s for 20 min to reverse and degas the electrode slurry.

[0099] The fineness of the electrode slurry prepared in this embodiment is 30 microns, the anti-sedimentation time is 12 hours, and the total slurry preparation time is 450 minutes.

[0100] Comparative Example 2

[0101] This comparative example provides a method for preparing electrode slurry using a three-planetary stirring device, the method comprising:

[0102] (1) a driver controls a planetary stirring blade to rotate at a speed of 10.5 m / s and to revolve at a speed of 3.5 m / s for 60 min, and lithium iron phosphate, conductive carbon black and polyvinylidene fluoride are mixed in a mixing container at a mass ratio of 94.5:2:3.5 to obtain a first mixed material, and then the mixture is allowed to stand for 10 min;

[0103] (2) adding N-methylpyrrolidone to the first mixture, and controlling the rotation and revolution of the planetary stirring paddle by the driver. The rotation and revolution of the planetary stirring paddle are divided into two stages. In the first stage, the rotation speed of the planetary stirring paddle is 22.5 m / s, the revolution speed is 7.5 m / s, and the time is 20 min. In the second stage, the rotation speed of the planetary stirring paddle is 34.5 m / s, the revolution speed is 11.5 m / s, and the time is 40 min. Then, adding N-methylpyrrolidone, and controlling the rotation and revolution of the planetary stirring paddle by the driver, the rotation speed of the planetary stirring paddle is 34.5 m / s, the revolution speed is 11.5 m / s, and the time is 60 min, to obtain a second mixture with a solid content of 69.32%;

[0104] (3) N-methylpyrrolidone was added to the second mixture, and the driver controlled the planetary stirring paddle to rotate at a speed of 22.5 m / s and revolve at a speed of 7.5 m / s for 180 min. Then, N-methylpyrrolidone was added, and the driver controlled the planetary stirring paddle to rotate at a speed of 22.5 m / s and revolve at a speed of 7.5 m / s for 60 min to obtain an electrode slurry with a viscosity of 5500 cp and a solid content of 54.5%. The driver controlled the planetary stirring paddle to rotate at a speed of 13.5 m / s and revolve at a speed of 4.5 m / s for 10 min to reverse and degas the electrode slurry.

[0105] The fineness of the electrode slurry prepared in this embodiment is 25 microns, the anti-settling time is 20 hours, and the total slurry preparation time is 440 minutes.

[0106] Comparative Example 3

[0107] This comparative example provides a method for preparing electrode slurry using a planetary dispersed stirring device, the method comprising:

[0108] (1) The driver controls the planetary stirring blade to rotate at a speed of 10.5 m / s and revolve at a speed of 3.5 m / s for 40 min, and the disperser rotates at a speed of 23 m / s for 40 min, and lithium iron phosphate, conductive carbon black and polyvinylidene fluoride are mixed in a mixing container at a mass ratio of 94.5:2:3.5 to obtain a first mixed material and then stand it for 10 min;

[0109] (2) N-methylpyrrolidone is added to the first mixture, and the driver controls the rotation and revolution of the planetary stirring paddle. The rotation and revolution of the planetary stirring paddle are divided into two stages. In the first stage, the rotation speed of the planetary stirring paddle is 22.5 m / s, the revolution speed is 7.5 m / s, and the time is 80 min. In the second stage, the rotation speed of the planetary stirring paddle is 34.5 m / s, the revolution speed is 11.5 m / s, and the time is 120 min. N-methylpyrrolidone is added again, and the driver controls the rotation and revolution of the planetary stirring paddle. The rotation speed of the planetary stirring paddle is 34.5 m / s, the revolution speed is 11.5 m / s, and the time is 160 min, to obtain a second mixture with a solid content of 65.32%;

[0110] (3) N-methylpyrrolidone was added to the second mixture, and the driver controlled the planetary stirring paddle to rotate at a speed of 22.5 m / s and revolve at a speed of 7.5 m / s for 40 min, and the disperser rotated at a speed of 23 m / s for 40 min. Then N-methylpyrrolidone was added, and the driver controlled the planetary stirring paddle to rotate at a speed of 22.5 m / s and revolve at a speed of 7.5 m / s for 20 min, and the disperser rotated at a speed of 23 m / s for 20 min to obtain an electrode slurry with a viscosity of 5300 cp and a solid content of 54.5%. The driver controlled the planetary stirring paddle to rotate at a speed of 13.5 m / s and revolve at a speed of 4.5 m / s for 10 min to reverse and degas the electrode slurry.

[0111] The fineness of the electrode slurry prepared in this embodiment is 24 microns, the anti-sedimentation time is 20 hours, and the total slurry preparation time is 480 minutes.

[0112] By comparing the total time for preparing the electrode slurry in the above embodiments and comparative examples with the solid content of the obtained electrode slurry, it can be known that: the slurry stirring device provided by the present invention, by adopting the method of integrating the freely rising and falling disperser 2 in the planetary stirring paddle 1, can effectively reduce the dead angle of the kneading process of the equipment, improve the kneading efficiency and thus improve the overall dispersion uniformity of the final slurry compared with the existing three-planetary equipment; the slurry stirring device provided by the present invention, by adopting the method of integrating the freely rising and falling disperser 2 in the planetary stirring paddle 1, can significantly improve the dilution capacity after kneading compared with the existing three-planetary equipment, and can ensure the slurry to obtain The method for preparing electrode slurry using the slurry stirring device of the present invention can not only improve the kneading efficiency, but also reduce the amount of liquid added during the slurry kneading and dilution process, and the solid content of the slurry prepared by the method is also increased accordingly, thereby reducing the preparation cost of the slurry; the electrode slurry prepared by the method of the present invention has high uniformity and dispersibility, so that the content ratio of active substances in the slurry prepared by the slurry stirring device can be increased while obtaining the same electrode conductivity, thereby improving the energy density of the electrode electrode prepared by the electrode slurry.

[0113] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention are within the protection scope and disclosure scope of the present invention.

Claims

1. A slurry stirring device, characterized in that: The slurry stirring device comprises a stirring container, three planetary stirring paddles are arranged in the stirring container, a disperser is integrated inside each of the planetary stirring paddles, and the slurry stirring device further comprises a lifting controller connected to the disperser, and a driver connected to the disperser and the planetary stirring paddle; The lifting controller is used to control the dispersion device to be lifted and lowered along the axial direction of the planetary stirring blade, and the driver is used to control the rotation of the dispersion device and the planetary stirring blade; the driver is used to control the rotation and revolution of the planetary stirring blade and control the rotation of the dispersion device; The planetary stirring paddle comprises a stirring blade and a stirring transmission shaft which is arranged on the paddle shoulder of the planetary stirring paddle and fixedly connected to the stirring blade, the stirring transmission shaft is connected to the driver, and a through hole is arranged on the stirring transmission shaft; The disperser comprises a dispersion disk and a dispersion transmission shaft fixedly connected to the dispersion disk, and the dispersion transmission shaft is connected to the driver after passing through the through hole; The inner diameter of the through hole is larger than the outer diameter of the dispersion transmission shaft, and the dispersion transmission shaft and the stirring transmission shaft do not contact each other and operate independently.

2. The slurry stirring device according to claim 1, characterized in that: The dispersion disk is arranged on the axis of the stirring blade and is located between the cross beam and the blade shoulder of the planetary stirring blade.

3. A method for preparing electrode slurry using the slurry stirring device according to claim 1 or 2, characterized in that: The method comprises: (1) the driver controls the rotation and revolution of the planetary stirring blade, and the disperser rotates while the planetary stirring blade revolves, mixing the solid components of the electrode slurry in the stirring container to obtain a first mixed material; (2) the lifting controller controls the disperser to rise and then leave the first mixed material, and adds the first liquid component of the electrode slurry to the first mixed material at least once, and the driver controls the planetary stirring blade to rotate and revolve after each addition of the first liquid component of the electrode slurry to obtain a second mixed material; (3) The lifting controller controls the disperser to descend and enter the second mixture, and the second liquid component of the electrode slurry is added to the second mixture at least once. After each addition of the second liquid component of the electrode slurry, the driver controls the planetary stirring paddle to rotate and revolve. The disperser rotates while the planetary stirring paddle revolves to obtain the electrode slurry.

4. The method according to claim 3, characterized in that The planetary agitator in step (1) has an autorotation speed of 7 to 13 m / s and an orbital speed of 2 to 7 m / s for 20 to 60 min.

5. The method according to claim 3, characterized in that: The disperser in step (1) rotates at a speed of 18 to 23 m / s for a time of 20 to 60 min.

6. The method according to claim 3, characterized in that The method further comprises standing for 5 to 30 minutes between step (1) and step (2).

7. The method according to claim 3, characterized in that The rotation and revolution of the planetary agitator in step (2) are divided into at least one stage. In each stage, the rotation speed of the planetary agitator is independently 15 to 45 m / s, the revolution speed is independently 5 to 15 m / s, and the time is independently 20 to 90 min.

8. The method according to claim 3, characterized in that Step (2) The solid content of the second mixture is 60% to 85%.

9. The method according to claim 3, characterized in that: In step (3), the disperser descends to the center position between the crossbeam and the shoulder of the planetary stirring impeller.

10. The method according to claim 3, characterized in that: In step (3), the planetary agitator has an autorotation speed of 15 to 30 m / s and an orbital speed of 5 to 10 m / s for 20 to 90 min.

11. The method according to claim 3, characterized in that The disperser in step (3) rotates at a speed of 18 to 23 m / s for a time of 20 to 90 min.

12. The method according to claim 3, characterized in that The viscosity of the electrode slurry in step (3) is 4000-30000cp.

13. The method according to claim 3, characterized in that The solid content of the electrode slurry in step (3) is 50-80%.

14. The method according to claim 3, characterized in that Step (3) also includes degassing the electrode slurry.

15. The method according to claim 14, characterized in that The deaeration includes a driver controlling the rotation and revolution of a planetary stirring paddle, the rotation speed is 9 to 18 m / s, the revolution speed is 3 to 6 m / s, and the time is 5 to 40 min. During the deaeration process, the rotation and revolution of the planetary stirring paddle are both reversed.

16. An electrode slurry, characterized in that: The electrode slurry is obtained by the method according to any one of claims 3 to 15.

17. A lithium ion battery, characterized in that: The lithium ion battery comprises the electrode slurry according to claim 16.

18. A vehicle, characterized in that: The vehicle includes the lithium-ion battery of claim 17.

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