A melt composite apparatus for preparing dense cathode materials for lithium-sulfur batteries

Abstract

This invention belongs to the field of lithium-sulfur battery technology, specifically a melt-composite device for preparing dense cathode materials for lithium-sulfur batteries. Addressing the problems of low thermal efficiency and insufficient mixing in the prior art, the following solution is proposed: a frame with a melt-composite tank slidably connected to the bottom outer wall of the frame, and a sealing cap on the top of the melt-composite tank. A hot-melt clamping mechanism is provided on the outer wall of the melt-composite tank. This invention's double hot-melt jacket not only clamps the melt-composite tank but also enables heat circulation, facilitating hot-melt operation and ensuring efficient heat conduction. The tight fit between the melt-composite tank and the jacket reduces heat loss and shortens melting time. A reciprocating screw and a first servo motor drive the lifting plate up and down, causing the liquid inlet pipe to inject binder or additives in layers within the tank, allowing the sulfur-carbon material to be composited with the liquid in stages, reducing agglomeration and lowering the material porosity.

Description

Technical Field

[0001] This utility model relates to the field of lithium-sulfur battery technology, and in particular to a melt composite device for preparing dense cathode materials for lithium-sulfur batteries. Background Technology

[0002] Lithium-sulfur batteries, as a novel high-energy-density energy storage device, are considered an important development direction for next-generation power batteries due to their theoretical specific energy of up to 2600 Wh / kg (approximately five times that of traditional lithium-ion batteries), low cost, and environmental friendliness. Their cathode materials typically employ sulfur-carbon composite materials, achieving energy storage through the reversible reaction between sulfur and lithium ions. However, the insulating properties of sulfur, the "shuttle effect" of polysulfides, and electrode volume expansion severely limit the practical performance of lithium-sulfur batteries. To address these issues, the preparation of densified cathode materials has become a key technology, with the core being the achievement of uniform composite composition and structural stabilization of sulfur with a conductive matrix.

[0003] Existing melt composite equipment generally suffers from the following shortcomings:

[0004] Low thermal efficiency: Traditional jacketed heating is prone to temperature gradients and uneven melting, which affects the penetration and compounding of sulfur.

[0005] Insufficient mixing: Static liquid feeding or fixed stirring makes it difficult to achieve layered and progressive composite of multiphase materials, and local agglomeration is likely to occur. Utility Model Content

[0006] To address the shortcomings of existing technologies, this invention provides a melt composite device for preparing dense cathode materials for lithium-sulfur batteries, which overcomes the deficiencies of existing technologies and effectively solves the problems of low thermal efficiency and insufficient mixing.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A melt composite device for preparing dense cathode material for lithium-sulfur batteries includes a frame, a melt composite tank slidably connected to the bottom outer wall of the frame, a sealing cover on the top of the melt composite tank, a hot-melt clamping mechanism on the outer wall of the melt composite tank, and a layered liquid inlet mechanism on the outer wall of the sealing cover.

[0009] The hot-melting clamping mechanism includes a hot-melting interlayer, a first hydraulic push rod, a heating inlet, and a heating outlet. The hot-melting interlayer comprises two layers and is rotatably connected to the inner wall of one side of the frame. The first hydraulic push rod is hinged between the molten composite tank and the hot-melting interlayer. The heating inlet and the heating outlet are respectively located at the bottom and top of the outer wall of one side of the hot-melting interlayer.

[0010] Preferably, the molten composite tank is tightly attached between the two hot melt interlayers.

[0011] Preferably, the layered liquid inlet mechanism includes a U-shaped plate, a reciprocating lead screw, a first servo motor, a pulley pair, a lifting plate, and an inlet pipe. The U-shaped plate is fixedly connected to the top outer wall of the sealing cover by screws, the reciprocating lead screw is rotatably connected to the inner wall of the U-shaped plate, the first servo motor is fixedly connected to one side outer wall of the U-shaped plate by screws, the pulley pair is installed between the first servo motor and the reciprocating lead screw, the lifting plate is screwed to the outer wall of the reciprocating lead screw, and the inlet pipe is welded to the inner wall of the lifting plate.

[0012] Preferably, a positive electrode material feed pipe is welded to the inner wall of the top of the sealing cover, and the liquid inlet pipe is slidably connected to the inner wall of the sealing cover. A first solenoid valve and a second solenoid valve are respectively installed on the outer walls of the positive electrode material feed pipe and the liquid inlet pipe.

[0013] Preferably, a second servo motor is fixedly connected to the center of the top outer wall of the sealing cover by screws, and the output shaft of the second servo motor is fixedly connected to a stirring rod by a coupling. A second hydraulic push rod is fixedly connected to the top outer wall of the frame by screws, and the piston rod of the second hydraulic push rod is fixedly connected to the top outer wall of the sealing cover. Symmetrically distributed guide rods are fixedly connected to the top outer wall of the sealing cover, and the guide rods are slidably connected to the inner wall of the frame.

[0014] Preferably, a guide frame is welded inside the frame, and the molten composite tank is slidably connected to the inner wall of the guide frame, and a slurry discharge pipe is welded to the bottom of the outer wall on one side of the molten composite tank.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. The melting composite equipment for preparing dense cathode materials for lithium-sulfur batteries designed in this paper has two hot-melt jackets symmetrically arranged on both sides of the melting composite tank. This not only clamps the melting composite tank but also enables heat circulation, facilitating hot-melt operation. Furthermore, the first hydraulic push rod can adjust the fit between the jacket and the tank body to ensure efficient heat conduction. The design of the melting composite tank and the jacket being tightly fitted can reduce heat loss and shorten the melting time.

[0017] 2. The melting composite equipment for preparing dense cathode materials for lithium-sulfur batteries designed in this paper uses a reciprocating screw and a first servo motor to drive the lifting plate to move up and down, which in turn drives the liquid inlet pipe to inject binder or additives in layers in the tank, so that the sulfur-carbon material and liquid are composited in stages, reducing agglomeration and lowering the porosity of the material. Attached Figure Description

[0018] Figure 1 This is a front view of the overall structure of a melt composite device for preparing dense cathode materials for lithium-sulfur batteries, as proposed in this utility model.

[0019] Figure 2This is a rear view of the overall structure of a melt composite device for preparing dense cathode materials for lithium-sulfur batteries, as proposed in this utility model.

[0020] Figure 3 This is a schematic diagram of the separation structure of the melt composite tank and the sealing cap of a melt composite device for preparing dense cathode material for lithium-sulfur batteries proposed in this utility model;

[0021] Figure 4 This is an enlarged schematic diagram of part A of the melt composite equipment for preparing dense cathode materials for lithium-sulfur batteries proposed in this utility model.

[0022] In the diagram: 1. Frame; 2. Melting and composite tank; 3. Sealing cover; 4. Hot-melt clamping mechanism; 41. Hot-melt interlayer; 42. First hydraulic push rod; 43. Heating inlet; 44. Heating outlet; 5. Layered liquid inlet mechanism; 51. U-shaped plate; 52. Reciprocating screw; 53. First servo motor; 54. Pulley pair; 55. Lifting plate; 56. Liquid inlet pipe; 6. Positive electrode material feed pipe; 7. First solenoid valve; 8. Second solenoid valve; 9. Second servo motor; 10. Stirring rod; 11. Second hydraulic push rod; 12. Guide rod; 13. Guide frame; 14. Slurry discharge pipe. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] Example 1, refer to Figures 1-4 A melt-composite device for preparing dense cathode material for lithium-sulfur batteries includes a frame 1. A melt-composite tank 2 is slidably connected to the bottom outer wall of the frame 1, and a sealing cover 3 is provided on the top of the melt-composite tank 2. A heat-fusion clamping mechanism 4 is provided on the outer wall of the melt-composite tank 2, and a layered liquid inlet mechanism 5 is provided on the outer wall of the sealing cover 3. The layered liquid inlet mechanism 5 includes a U-shaped plate 51, a reciprocating screw 52, ​​a first servo motor 53, a pulley pair 54, a lifting plate 55, and a liquid inlet pipe 56. The U-shaped plate 51 is fixedly connected to the top outer wall of the sealing cover 3 by screws. The reciprocating screw 52 is rotatably connected to the inner wall of the U-shaped plate 51. The first servo motor 53 is fixedly connected to one side outer wall of the U-shaped plate 51 by screws. The pulley pair 54 is installed between the first servo motor 53 and the reciprocating screw 52. The lifting plate 55 is screwed to the outer wall of the reciprocating screw 52. The liquid inlet pipe 56 is welded to the inner wall of the lifting plate 55.

[0025] In this embodiment, the U-shaped plate 51 is fixed to the top of the sealing cover 3, the reciprocating screw 52 is driven by the first servo motor 53 through the pulley pair 54, and the lifting plate 55 completes the injection of a layer of liquid with each lifting and lowering. The end of the liquid inlet pipe 56 is provided with an atomizing nozzle to ensure that the liquid is evenly dispersed.

[0026] Example 2, refer to Figure 3 A melt-composite device for preparing dense cathode materials for lithium-sulfur batteries is disclosed. The hot-melt clamping mechanism 4 includes a hot-melt interlayer 41, a first hydraulic push rod 42, a heating inlet 43, and a heating outlet 44. Two hot-melt interlayers 41 are rotatably connected to the inner wall of one side of a frame 1. The first hydraulic push rod 42 is hinged between the melt-composite tank 2 and the hot-melt interlayers 41. The heating inlet 43 and the heating outlet 44 are respectively located at the bottom and top of the outer wall of one side of the hot-melt interlayers 41. The melt-composite tank 2 is tightly attached between the two hot-melt interlayers 41.

[0027] In this embodiment, two hot melt interlayers 41 are mounted on the inner wall of the frame 1 via hinge shafts, and the two ends of the first hydraulic push rod 42 are respectively hinged to the hot melt interlayers 41 and the molten composite tank 2.

[0028] Reference Figure 1 The inner wall of the top of the sealing cover 3 is welded with a positive electrode material feed pipe 6, and the liquid inlet pipe 56 is slidably connected to the inner wall of the sealing cover 3. A first solenoid valve 7 and a second solenoid valve 8 are respectively installed on the outer walls of the positive electrode material feed pipe 6 and the liquid inlet pipe 56.

[0029] Reference Figures 2-3 A second servo motor 9 is fixedly connected to the center of the top outer wall of the sealing cover 3 by screws, and the output shaft of the second servo motor 9 is fixedly connected to a stirring rod 10 by a coupling. A second hydraulic push rod 11 is fixedly connected to the top outer wall of the frame 1 by screws. The piston rod of the second hydraulic push rod 11 is fixedly connected to the top outer wall of the sealing cover 3. Symmetrically distributed guide rods 12 are fixedly connected to the top outer wall of the sealing cover 3, and the guide rods 12 are slidably connected to the inner wall of the frame 1.

[0030] Reference Figures 2-3 The frame 1 is welded with a guide frame 13 inside, and the molten composite tank 2 is slidably connected to the inner wall of the guide frame 13. A slurry discharge pipe 14 is welded to the bottom of the outer wall of one side of the molten composite tank 2.

[0031] The sealing cover 3 is vertically raised and lowered via the second hydraulic push rod 11. The guide rod 12 engages with the linear bearing on the inner wall of the frame 1 to ensure motion accuracy. The stirring rod 10 adopts a spiral blade design, and its rotation speed can be automatically adjusted according to the viscosity of the material. A manual valve is installed at the outlet of the discharge pipe 14, allowing for gravity-fed discharge of materials.

[0032] Working principle:

[0033] Loading and Preheating: The sealing cover 3 is lifted by the second hydraulic push rod 11, and the sulfur-carbon mixture of the positive electrode material is put into the melting composite tank 2 through the positive electrode material feed pipe 6. After the first solenoid valve 7 is closed, the sealing cover 3 is lowered and locked. The hot melting clamping mechanism 4 is activated, and the hot medium circulates to heat the melting composite tank 2, so that the sulfur is quickly melted into a liquid state.

[0034] Layered liquid injection and stirring: The first servo motor 53 drives the reciprocating screw 52, ​​and the liquid injection pipe 56 moves from top to bottom. At the same time, the second solenoid valve 8 opens proportionally, and the binder is injected in multiple layers. The second servo motor 9 starts, and the stirring rod 10 stirs at low speed to avoid the generation of air bubbles. As the viscosity increases, the speed gradually increases to ensure uniform compounding. The subsequent discharge pipe 14 opens through the valve to let the compounded slurry flow out.

[0035] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A molten compounding apparatus for preparing a dense positive electrode material of a lithium-sulfur battery, comprising a frame (1), characterized in that, The bottom outer wall of the frame (1) is slidably connected to a melting composite tank (2), and a sealing cover (3) is provided on the top of the melting composite tank (2). A hot-melt clamping mechanism (4) is provided on the outer wall of the melting composite tank (2), and a layered liquid inlet mechanism (5) is provided on the outer wall of the sealing cover (3). The hot-melt clamping mechanism (4) includes a hot-melt interlayer (41), a first hydraulic push rod (42), a heating inlet (43), and a heating outlet (44). The hot-melt interlayer (41) includes two layers and is rotatably connected to the inner wall of one side of the frame (1). The first hydraulic push rod (42) is hinged between the molten composite tank (2) and the hot-melt interlayer (41). The heating inlet (43) and the heating outlet (44) are respectively located at the bottom and top of the outer wall of one side of the hot-melt interlayer (41).

2. The melt composite equipment for preparing dense cathode material for lithium-sulfur batteries according to claim 1, characterized in that, The molten composite tank (2) is tightly attached between the two hot melt interlayers (41).

3. The melt composite equipment for preparing dense cathode material for lithium-sulfur batteries according to claim 1, characterized in that, The layered liquid inlet mechanism (5) includes a U-shaped plate (51), a reciprocating screw (52), a first servo motor (53), a pulley pair (54), a lifting plate (55), and an inlet pipe (56). The U-shaped plate (51) is fixedly connected to the top outer wall of the sealing cover (3) by screws. The reciprocating screw (52) is rotatably connected to the inner wall of the U-shaped plate (51). The first servo motor (53) is fixedly connected to one side outer wall of the U-shaped plate (51) by screws. The pulley pair (54) is installed between the first servo motor (53) and the reciprocating screw (52). The lifting plate (55) is screwed to the outer wall of the reciprocating screw (52). The inlet pipe (56) is welded to the inner wall of the lifting plate (55).

4. The melt composite equipment for preparing dense cathode material for lithium-sulfur batteries according to claim 1, characterized in that, The inner wall of the top of the sealing cover (3) is welded with a positive electrode material feed pipe (6), and the liquid inlet pipe (56) is slidably connected to the inner wall of the sealing cover (3). The outer walls of the positive electrode material feed pipe (6) and the liquid inlet pipe (56) are respectively equipped with a first solenoid valve (7) and a second solenoid valve (8).

5. The melt composite equipment for preparing dense cathode material for lithium-sulfur batteries according to claim 1, characterized in that, The sealing cover (3) is fixedly connected to the center of the top outer wall by screws, and the output shaft of the second servo motor (9) is fixedly connected to the stirring rod (10) by a coupling. The top outer wall of the frame (1) is fixedly connected to the second hydraulic push rod (11) by screws. The piston rod of the second hydraulic push rod (11) is fixedly connected to the top outer wall of the sealing cover (3). The top outer wall of the sealing cover (3) is fixedly connected to symmetrically distributed guide rods (12), and the guide rods (12) are slidably connected to the inner wall of the frame (1).

6. The melt composite equipment for preparing dense cathode material for lithium-sulfur batteries according to claim 1, characterized in that, The frame (1) is welded with a guide frame (13) inside, and the molten composite tank (2) is slidably connected to the inner wall of the guide frame (13). A slurry discharge pipe (14) is welded to the bottom of the outer wall of one side of the molten composite tank (2).

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