Stirring device for adding graphene into positive electrode material

Abstract

The utility model relates to the technical field of battery positive electrode material production, in particular to a stirring device for adding graphene into a positive electrode material. Comprising a tank body, the lower end of the tank body is fixedly communicated with an outlet pipe, a rotating rod is rotatably connected in the tank body, an inner cylinder is fixed in the tank body, a filter plate is rotatably connected in the inner cylinder, the rotating rod penetrates through the inner cylinder and the filter plate, the rotating rod is fixedly connected with the filter plate, the rotating rod is rotatably connected with the inner cylinder, and a plurality of scrapers are uniformly distributed and fixed on the upper circumference of the rotating rod part in the inner cylinder and located below the filter plate. The lower end of the scraper is in sliding contact with a bottom plate of the inner cylinder, a plurality of filter holes are formed in the bottom plate of the inner cylinder, the upper end of the inner cylinder is fixedly communicated with a powder pipe, and the side wall of the inner cylinder is fixedly communicated with a liquid pipe. The positive electrode material of the battery is uniformly scattered into the inner cylinder below the filter plate and then is scoured by the graphene-containing liquid material, so that the phenomenon that the positive electrode material of the battery is mixed with the graphene-containing liquid material to generate larger blocks to block the filter holes can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of battery positive electrode material production, in particular to a stirring device for adding graphene to positive electrode materials. Background Art

[0002] As a new type of green energy, lithium-ion batteries are now widely used as power sources for mobile phones, portable computers, camcorders, cameras, etc., with their unique advantages such as high energy density, long cycle life, no memory effect, no pollution, and good safety performance. They are also gradually replacing traditional batteries in national defense, military industry, aerospace and navigation, artificial satellites, small medical instruments and military communication equipment. In just over a decade of rapid development, the market share of lithium-ion batteries in small rechargeable batteries has exceeded and partially replaced traditional lead-acid batteries and nickel-cadmium and nickel-hydrogen batteries, and has gradually become the mainstream of small secondary batteries. Lithium manganese oxide (LiMn2O4) has the advantages of high voltage platform, low temperature resistance and good rate performance, and environmental friendliness. In addition, manganese resources are very abundant. Compared with lithium iron phosphate and ternary materials, it has outstanding cost advantages and has become a new generation of green positive electrode materials. With the rapid development of related industries such as power batteries and energy storage, the requirements for LiMn2O4 positive electrode materials are also getting higher and higher. However, the shortcomings of pure phase LiMn2O4, such as poor cycle performance and electrochemical stability, limit its wide application. In the graphene-doped lithium manganese oxide positive electrode material, the doping of graphene effectively controls the growth of grains, the grains inside the material are arranged in an orderly manner and stacked relatively densely, maintaining the structural stability of the electrode material; at the same time, the excellent conductive properties of graphene accelerate the electron migration rate of the composite material, effectively improving the conductivity of the electrode material, so that the material still has good cycle stability under high-rate charge and discharge conditions.

[0003] The patent document with application number CN201010618690.9 and titled "A method for preparing a graphene-like doped lithium-ion battery positive electrode material" discloses a method for improving the conductivity and specific capacity by doping a graphene-like doped lithium-ion battery positive electrode material. The method comprises the following steps: (1) stirring a liquid acrylonitrile oligomer (LPAN) solution at 80-300°C for 8-72 hours to form a micro-cyclized LPAN solution; (2) adding a certain amount of lithium-ion battery positive electrode material powder to the micro-cyclized LPAN solution and mixing them evenly; (3) grinding and drying at room temperature; (4) calcining at 500-1800°C for 6-24 hours, preferably at 600-1100°C under the protection of an inert atmosphere, so that the micro-cyclized LPAN forms a graphene-like structure and is evenly distributed in the lithium-ion battery positive electrode material, thereby obtaining a graphene-like doped lithium-ion battery positive electrode material.

[0004] In the above step (2), a powder-liquid mixing device is required. A patent document with application number CN202223268460.1 and titled "A Liquid-Powder Mixing Agitator for Chemical Production" discloses a solid-liquid mixing agitator. The liquid material and the powder material are respectively transported to the inside of the guide tube through the liquid infusion tube and the powder conveying tube. The two channels inside the guide tube are interconnected through the connecting hole, so that the liquid material transported by the liquid infusion tube flushes the powder material transported by the powder conveying tube of the lower channel, so that the material is preliminarily mixed in the guide tube and discharged into the discharge barrel through the discharge hole. After the agglomerated material enters the discharge barrel with the preliminarily mixed material, the inner scraper is driven to move in the discharge barrel under the rotation of the stirring rod. Under the movement of the inner scraper, when the agglomerated material passes through the filter plate, the agglomerated material is broken under the pushing and rolling of the inner scraper. In the process of breaking, the agglomerated material is filtered and overflowed to the outside of the discharge barrel. Under the scraping of the outer scraper outside the discharge barrel, the material falls into the inside of the mixing barrel below, and is stirred and mixed by the stirring head, so that the mixing and stirring of the material is more uniform. However, when the liquid material transported by the liquid infusion tube flushes the powder material transported by the powder conveying tube of the lower channel, the powder is easy to agglomerate and block the discharge hole. Utility Model Content

[0005] The technical problem to be solved by the utility model is a stirring device for adding graphene to positive electrode materials with high mixing efficiency.

[0006] In order to achieve the above purpose, the technical solution provided by the utility model is:

[0007] The stirring device for adding graphene to the positive electrode material comprises a tank body, the lower end of the tank body is fixedly connected with an outlet pipe, a rotating rod is rotatably connected to the tank body, an inner cylinder is fixed in the tank body, a filter plate is rotatably connected in the inner cylinder, the rotating rod penetrates the inner cylinder and the filter plate, the rotating rod is fixedly connected to the filter plate, the rotating rod is rotatably connected to the inner cylinder, a plurality of scrapers are evenly fixed on the circumference of the rotating rod part inside the inner cylinder, the scraper is located below the filter plate, the lower end of the scraper is in sliding contact with the bottom plate of the inner cylinder, a plurality of filter holes are provided on the bottom plate of the inner cylinder, a powder pipe is fixedly connected to the upper end of the inner cylinder, the powder pipe is connected to the inner cylinder part above the filter plate, a liquid pipe is fixedly connected on the side wall of the inner cylinder, the liquid pipe is connected to the inner cylinder part below the filter plate, a cone bucket is fixed in the tank body below the inner cylinder, a grinding sleeve is fixed at the lower end of the cone bucket, the rotating rod penetrates the cone bucket and the grinding sleeve, a grinding roller is arranged in the grinding sleeve, the rotating rod penetrates the grinding roller, the rotating rod is fixedly connected to the grinding roller, and a grinding gap is arranged between the inner wall of the grinding sleeve and the outer wall of the grinding roller.

[0008] Specifically, a plurality of stirring blades are fixed on the rotating rod.

[0009] Specifically, a support is fixed inside the lower end of the tank body, and the lower end of the rotating rod is rotatably connected to the support.

[0010] Specifically, a motor is fixed to the upper end of the tank body, and the output shaft of the motor is fixedly connected to the upper end of the rotating rod.

[0011] Specifically, the scraper is provided with a plurality of long holes.

[0012] Specifically, an intermittent vibration assembly is installed at the lower end of the top plate of the inner cylinder, and the intermittent vibration assembly includes a fixed tube fixed at the lower end of the top plate of the inner cylinder, the fixed tube is vertically arranged, and a sliding rod is concentrically elastically slidably connected in the fixed tube, and a universal ball is installed at the lower end of the sliding rod, and the universal ball is in rolling contact with the upper end of the filter plate, and a wedge block is fixed to the upper end of the filter plate. The wedge block can make the universal ball and the sliding rod move upward during the rotation of the filter plate, and the sliding rod can drive the universal ball to hit the filter plate after the universal ball is separated from the wedge block.

[0013] Specifically, the upper end of the slide rod is fixedly connected to the lower end of the spring, and the upper end of the spring is fixedly connected to the top plate of the inner tube.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. The utility model can make the positive electrode material of the battery evenly spread in the inner cylinder below the filter plate, and the liquid material containing graphene enters the inner cylinder below the filter plate through the liquid pipe and is pre-mixed with the positive electrode material of the battery to form a primary mixture. The scraper can stir the primary mixture during the rotation process, and the primary mixture flows from the filter hole into the tank body and is stirred by the stirring blade, which can improve the stirring efficiency. The positive electrode material of the battery is evenly spread in the inner cylinder below the filter plate and then flushed by the liquid material containing graphene, which can avoid the positive electrode material of the battery and the liquid material containing graphene from mixing and forming large lumps and clogging the filter hole.

[0016] 2. During the rotation of the scraper, the lumps stuck in the filter holes can be scraped off, the lumps can be crushed and the filter holes can be kept unobstructed.

[0017] 3. When the primary mixture formed by mixing the positive electrode material of the battery and the liquid material containing graphene passes through the grinding gap, the grinding roller can grind and crush the lumps in the primary mixture, which can ensure the uniformity of the mixing of the positive electrode material of the battery and the liquid material containing graphene.

[0018] 4. By setting an intermittent vibration component, the filter plate can vibrate intermittently, which can ensure that the positive electrode material of the battery passes through the filter plate smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of the utility model.

[0020] Figure 2 for Figure 1 Magnified view of area A.

[0021] Figure 3 Schematic diagram of the internal structure of the inner cylinder.

[0022] The names of the parts in the attached drawings are:

[0023] 1 Tank

[0024] 2 Rotating rod

[0025] 3 Outlet

[0026] 4 Powder tube

[0027] 5 liquid tube

[0028] 6 Motor

[0029] 7 stirring blade

[0030] 8 Support

[0031] 9 Inner tube

[0032] 10 filter plate

[0033] 11 Scraper

[0034] 12 Long hole

[0035] 13 filter holes

[0036] 14 Cone bucket

[0037] 15 Grinding sleeve

[0038] 16 Grinding roller

[0039] 17 Spring

[0040] 18 Fixed pipe

[0041] 19 Sliders

[0042] 20 Universal ball

[0043] 21 Wedge. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0045] Example 1: Reference Figure 1 and Figure 3 As shown, the stirring device for adding graphene to the positive electrode material includes a tank body 1, the lower end of the tank body 1 is fixedly connected with an outlet pipe 3, a rotating rod 2 is rotatably connected in the tank body 1, and a plurality of stirring blades 7 are fixed on the rotating rod 2. A support 8 is fixed in the lower end of the tank body 1, and the lower end of the rotating rod 2 is rotatably connected to the support 8. A motor 6 is fixed at the upper end of the tank body 1, and the output shaft of the motor 6 is fixedly connected to the upper end of the rotating rod 2.

[0046] An inner cylinder 9 is fixed in the tank body 1, a filter plate 10 is rotatably connected in the inner cylinder 9, a rotating rod 2 passes through the inner cylinder 9 and the filter plate 10, the rotating rod 2 is fixedly connected to the filter plate 10, the rotating rod 2 is rotatably connected to the inner cylinder 9, and a plurality of scrapers 11 are evenly distributed and fixed on the circumference of the rotating rod 2 inside the inner cylinder 9, the scrapers 11 are located below the filter plate 10, and the lower end of the scrapers 11 is in sliding contact with the bottom plate of the inner cylinder 9. The scrapers 11 are provided with a plurality of long holes 12. A plurality of filter holes 13 are provided on the bottom plate of the inner cylinder 9.

[0047] The upper end of the inner cylinder 9 is fixedly connected with a powder pipe 4, which is connected to the inner cylinder 9 part above the filter plate 10. The side wall of the inner cylinder 9 is fixedly connected with a liquid pipe 5, which is connected to the inner cylinder 9 part below the filter plate 10.

[0048] The motor 6 is started, and the motor 6 drives the rotating rod 2, the filter plate 10, the scraper 11, the stirring blade 7 and the grinding roller 16 to rotate. The positive electrode material of the battery enters the top of the filter plate 10 through the powder tube 4, and the rotating filter plate 10 can evenly spread the positive electrode material of the battery into the inner cylinder 9 below the filter plate 10. The liquid material containing graphene enters the inner cylinder 9 below the filter plate 10 through the liquid pipe 5 and mixes with the positive electrode material of the battery to form a primary mixture.

[0049] The scraper 11 can stir the primary mixture during its rotation, and the primary mixture flows from the filter hole 13 into the tank body 1 and is stirred by the stirring blade 7, which can improve the stirring efficiency. The positive electrode material of the battery is evenly spread into the inner cylinder 9 below the filter plate 10 and then washed by the liquid containing graphene, which can prevent the positive electrode material of the battery from mixing with the liquid containing graphene to form large lumps and block the filter hole 13.

[0050] During the rotation of the scraper 11 , the lumps stuck in the filter holes 13 can be scraped and broken up, and the lumps can be crushed and the filter holes 13 can be kept unobstructed.

[0051] By providing a plurality of long holes 12 on the scraper 11, the preliminary mixture can pass through the long holes 12 during the process of the scraper 11 stirring the preliminary mixture. Therefore, the fluidity of the preliminary mixture in the inner cylinder 9 is increased, and the mixing efficiency of the positive electrode material of the battery and the liquid material containing graphene can be improved.

[0052] A cone bucket 14 is fixed in the tank body 1 below the inner cylinder 9, a grinding sleeve 15 is fixed at the lower end of the cone bucket 14, a rotating rod 2 passes through the cone bucket 14 and the grinding sleeve 15, a grinding roller 16 is arranged in the grinding sleeve 15, the rotating rod 2 passes through the grinding roller 16, the rotating rod 2 is fixedly connected to the grinding roller 16, and a grinding gap is arranged between the inner wall of the grinding sleeve 15 and the outer wall of the grinding roller 16.

[0053] When the primary mixture formed by mixing the positive electrode material of the battery and the liquid material containing graphene passes through the grinding gap, the rotating grinding roller 16 cooperates with the stationary grinding sleeve 15 to grind and crush the lumps in the primary mixture, thereby ensuring the uniformity of the mixing of the positive electrode material of the battery and the liquid material containing graphene.

[0054] Embodiment 2: Based on Embodiment 1, refer to Figure 1 and Figure 2 As shown, an intermittent vibration assembly is installed at the lower end of the top plate of the inner cylinder 9. The intermittent vibration assembly includes a fixed tube 18 fixed to the lower end of the top plate of the inner cylinder 9, and the fixed tube 18 is vertically arranged. A slide rod 19 is coaxially elastically slidably connected in the fixed tube 18. Specifically, the upper end of the slide rod 19 is fixedly connected to the lower end of the spring 17, and the upper end of the spring 17 is fixedly connected to the top plate of the inner cylinder 9.

[0055] A universal ball 20 is installed at the lower end of the slide rod 19 , and the universal ball 20 is in rolling contact with the upper end of the filter plate 10 , and a wedge block 21 is fixed to the upper end of the filter plate 10 .

[0056] The wedge block 21 can make the universal ball 20 and the slide bar 19 move upward when rotating with the filter plate 10 . After the universal ball 20 is separated from the wedge block 21 , the slide bar 19 can drive the universal ball 20 to hit the filter plate 10 .

[0057] During the rotation of the filter plate 10, when the wedge block 21 contacts the universal ball 20, as the wedge block 21 and the filter plate 10 rotate, the wedge block 21 can make the universal ball 20 and the slide bar 19 move upward. At the same time, the spring 17 is squeezed. When the universal ball 20 separates from the wedge block 21, the slide bar 19 and the universal ball 20 quickly move downward under the elastic force of the spring 17 and impact the filter plate 10, causing the filter plate 10 to vibrate, which can ensure that the positive electrode material of the battery passes through the filter plate 10 smoothly.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A stirring device for adding graphene to a positive electrode material, comprising a tank body (1), a lower end of the tank body (1) being fixedly connected to an outlet pipe (3), and a rotating rod (2) being rotatably connected inside the tank body (1), characterized in that: An inner cylinder (9) is fixed inside the tank body (1), a filter plate (10) is rotatably connected inside the inner cylinder (9), a rotating rod (2) passes through the inner cylinder (9) and the filter plate (10), the rotating rod (2) is fixedly connected to the filter plate (10), the rotating rod (2) is rotatably connected to the inner cylinder (9), a plurality of scrapers (11) are evenly distributed and fixed on the circumference of the rotating rod (2) inside the inner cylinder (9), the scrapers (11) are located below the filter plate (10), the lower ends of the scrapers (11) are in sliding contact with the bottom plate of the inner cylinder (9), a plurality of filter holes (13) are provided on the bottom plate of the inner cylinder (9), a powder pipe (4) is fixedly connected to the upper end of the inner cylinder (9), and the powder pipe (4) is connected to the inner cylinder (9). The inner cylinder (9) part above the filter plate (10) is connected, a liquid pipe (5) is fixedly connected on the side wall of the inner cylinder (9), the liquid pipe (5) is connected with the inner cylinder (9) part below the filter plate (10), a cone bucket (14) is fixed in the tank body (1) below the inner cylinder (9), a grinding sleeve (15) is fixed at the lower end of the cone bucket (14), a rotating rod (2) passes through the cone bucket (14) and the grinding sleeve (15), a grinding roller (16) is arranged in the grinding sleeve (15), the rotating rod (2) passes through the grinding roller (16), the rotating rod (2) and the grinding roller (16) are fixedly connected, and a grinding gap is arranged between the inner wall of the grinding sleeve (15) and the outer wall of the grinding roller (16).

2. The stirring device for adding graphene to the positive electrode material according to claim 1, characterized in that: A plurality of stirring blades (7) are fixed on the rotating rod (2).

3. The stirring device for adding graphene to the positive electrode material according to claim 1, characterized in that: A support (8) is fixed inside the lower end of the tank body (1), and the lower end of the rotating rod (2) is rotatably connected to the support (8).

4. The stirring device for adding graphene to the positive electrode material according to claim 1, characterized in that: A motor (6) is fixed to the upper end of the tank body (1), and an output shaft of the motor (6) is fixedly connected to the upper end of the rotating rod (2).

5. The stirring device for adding graphene to the positive electrode material according to claim 1, characterized in that: The scraper (11) is provided with a plurality of long holes (12).

6. The stirring device for adding graphene to the positive electrode material according to claim 1, characterized in that: An intermittent vibration assembly is installed at the lower end of the top plate of the inner cylinder (9), and the intermittent vibration assembly includes a fixed tube (18) fixed to the lower end of the top plate of the inner cylinder (9). The fixed tube (18) is vertically arranged, and a slide rod (19) is coaxially elastically slidably connected in the fixed tube (18). A universal ball (20) is installed at the lower end of the slide rod (19). The universal ball (20) is in rolling contact with the upper end of the filter plate (10). A wedge block (21) is fixed to the upper end of the filter plate (10). The wedge block (21) can make the universal ball (20) and the slide rod (19) move upward during the rotation of the filter plate (10). After the universal ball (20) and the wedge block (21) are separated, the slide rod (19) can drive the universal ball (20) to hit the filter plate (10).

7. The stirring device for adding graphene to the positive electrode material according to claim 6, characterized in that: The upper end of the slide rod (19) is fixedly connected to the lower end of the spring (17), and the upper end of the spring (17) is fixedly connected to the top plate of the inner cylinder (9).

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