Sodium ion battery positive electrode material preparation system

Abstract

The utility model discloses a sodium ion battery positive electrode material preparation system which comprises a raw material impurity remover, a constant-speed stirring instrument, a sand mill, a spray dryer, a sintering furnace, a jet mill and a waste recoverer which are connected in sequence, wherein a water bath kettle is arranged outside the constant-speed stirring instrument. The sodium-ion battery positive electrode material preparation system can adapt to the characteristics of the sodium-ion battery positive electrode material, so that the sodium-ion positive electrode material is easier to dissolve, and the risk of blockage in the processes of sanding, spraying and the like is reduced.

Description

Technical Field

[0001] This utility model relates to a cathode material preparation system, and more particularly to a cathode material preparation system for sodium-ion batteries. Background Technology

[0002] After years of development and application, lithium-ion battery technology has matured, and lithium iron phosphate, as a commonly used cathode material in lithium-ion batteries, also has a relatively mature preparation system. While lithium iron phosphate offers good safety performance, its energy density is low and its cost is high. To reduce production costs, research on sodium-ion batteries has gradually emerged in recent years.

[0003] However, the preparation of sodium-ion battery cathode materials still follows the lithium iron phosphate cathode material preparation system. Since the various characterization indicators of sodium-ion battery cathode materials, such as the initial material solution viscosity, solid content, particle size of the solution after sand milling, and compaction of sintered material, are different from those of lithium iron phosphate cathode materials, and the characteristics of raw materials, dissolved materials, precursors, and sintered materials in the preparation process are also different from those of lithium iron phosphate cathode materials, the lithium iron phosphate preparation system is difficult to fully adapt to sodium-ion battery cathode materials.

[0004] The most prominent problem is that the electrical performance of sodium-ion cathode materials is generally improved by increasing the compaction density of the material. This makes the sodium-ion battery cathode slurry more viscous, has a higher solid content, and is more prone to agglomeration compared to lithium iron phosphate slurry, making it more difficult to dissolve. As a result, the slurry is more likely to clog pipes during the sand milling process and more likely to clog nozzles during the spraying process. Summary of the Invention

[0005] Purpose of the utility model: The purpose of this utility model is to provide a sodium-ion battery cathode material preparation system that can adapt to the characteristics of sodium-ion battery cathode materials.

[0006] Technical solution: The sodium-ion battery cathode material preparation system of this utility model includes a raw material impurity remover, a constant speed stirrer, a sand mill, a spray dryer, a sintering furnace, an air jet mill, and a waste recycling unit connected in sequence; wherein, a water bath is provided outside the constant speed stirrer.

[0007] The water bath includes a circulating water jacket, which controls the working temperature inside the constant-speed stirrer. This facilitates more complete dissolution of the raw materials for the sodium-ion battery cathode, thereby reducing the risk of material blockage during subsequent processes such as sand milling.

[0008] The constant-speed mixer is connected to a peristaltic pump to ensure that the constant-speed mixer can uniformly mix different raw materials.

[0009] The sand mill is connected to a first temperature-controlled pure water machine; the spray dryer is connected to a second temperature-controlled pure water machine with a spray gun. The external temperature-controlled pure water machine cleans the sand mill, effectively preventing material residue and even scaling inside the grinding chamber and pipes, thus further preventing material blockage during the sand milling process. The second temperature-controlled pure water machine with a spray gun is used for cleaning the spray dryer; the external spray gun facilitates thorough removal of internal residual materials, further preventing material blockage. Preferably, the spray dryer uses fan-shaped nozzles.

[0010] The sand mill includes a feed hopper and a grinding hopper. A diaphragm pump is used to transport materials from the feed hopper to the grinding hopper. The diaphragm pump ensures the sealing of the material solution during transport and is also more corrosion-resistant than centrifugal pumps, screw pumps, gear pumps, etc.

[0011] A first delivery pump is connected between the constant-speed stirrer and the sand mill, and a second delivery pump is connected between the sand mill and the spray dryer. Both the first and second delivery pumps are diaphragm pumps. This design enhances the continuity and efficiency of the entire sodium-ion battery cathode material preparation system and prevents material contamination during manual transportation.

[0012] A first vibrating screen is connected between the spray dryer and the sintering furnace, and a second vibrating screen is connected between the sintering furnace and the air jet mill. The first and second vibrating screens are used to screen the sprayed material and the sintered material, respectively, thereby improving the particle size uniformity of the prepared material and preventing material agglomeration.

[0013] The waste collector is connected to the constant-speed stirrer, the spray dryer, and the air jet mill. Furthermore, the waste collector can also be connected to the sintering furnace, and it has a solid-liquid separation function. The waste collector collects solid and liquid waste generated during the preparation and cleaning of sodium electrode materials in the aforementioned equipment. It is spacious, portable, well-sealed, and has a solid-liquid separation function, facilitating the subsequent transfer of solid and liquid waste to a solid-liquid recycling station.

[0014] Beneficial effects: Compared with the prior art, this utility model has the following advantages: 1. The water bath can control the working temperature inside the constant speed stirrer, which is conducive to more complete dissolution of the raw materials of sodium-ion battery cathode material and reduces the probability of material blockage; 2. Both the sand mill and the spray dryer are connected to a temperature-controlled pure water machine for cleaning, which further reduces the probability of material blockage; 3. The waste recycling device collects and separates the solid and liquid waste generated by each device, which is economical and environmentally friendly. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the preparation system of this utility model. Detailed Implementation

[0016] The technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0017] like Figure 1 As shown, the sodium-ion battery cathode material preparation system of this application includes a raw material impurity remover 1, a constant-speed stirrer 2, a sand mill 3, a spray dryer 4, a sintering furnace 5, an air jet mill 6, and a waste collector 7 connected in sequence. The sand mill 3 is connected to a first temperature-controlled pure water machine 8; the spray dryer 4 is connected to a second temperature-controlled pure water machine 9 with a spray gun. A first transfer pump 10 is connected between the constant-speed stirrer 2 and the sand mill 3, and a second transfer pump 11 is connected between the sand mill 3 and the spray dryer 4. In this embodiment, both the first transfer pump 10 and the second transfer pump 11 are diaphragm pumps. The sand mill 3 includes a feed hopper and a grinding hopper, and the diaphragm pump is used to transport materials from the feed hopper to the grinding hopper. A first vibrating screen 12 is connected between the spray dryer 4 and the sintering furnace, and a second vibrating screen 13 is connected between the sintering furnace and the air jet mill 6. A water bath is installed outside the constant-speed stirrer 2, and the working temperature inside the constant-speed stirrer 2 is controlled by a circulating water jacket. The constant-speed mixer 2 is connected to a peristaltic pump to ensure uniform mixing of different raw materials. The waste collector 7 is connected to the constant-speed mixer 2, the spray dryer 4, and the air jet mill 6. The waste collector 7 has a solid-liquid separation function to facilitate the subsequent transfer of solid and liquid waste to a solid-liquid recycling station.

[0018] In the preparation of sodium-ion battery cathode materials, the materials are first fed into a raw material impurity remover 1 for impurity removal. Then, the materials sequentially enter a constant-speed stirrer 2 and a sand mill 3 for mixing, grinding, and dispersion. A spray dryer 4 is used to dry and atomize the slurry. A sintering furnace 5 and an air jet mill 6 respectively complete the sintering and pulverization of the materials. A water bath is installed outside the constant-speed stirrer 2 to control the working temperature inside, which is beneficial for the full dissolution of materials. An external peristaltic pump allows the constant-speed stirrer 2 to uniformly mix different raw materials. A first temperature-controlled pure water machine 8 is connected to the sand mill 3 to clean it, effectively preventing material residue and even scaling inside the sand mill chamber and pipes, thus further preventing material blockage during the sand milling process. A second temperature-controlled pure water machine 9 with a spray gun is connected to the spray dryer 4 for cleaning, facilitating the thorough removal of internal residual materials. The spray dryer 4 uses a fan-shaped nozzle to further prevent material blockage. The first transfer pump 10 and the second transfer pump 11 employ diaphragm pumps, enhancing the continuity and efficiency of the entire sodium-ion battery cathode material preparation system and preventing material contamination during manual transport. This application designs the preparation system based on the characteristics of sodium-ion battery cathode materials, increasing the lifespan of each piece of equipment, improving preparation efficiency, reducing labor costs, and making the preparation process of sodium-ion battery cathode materials more stable and smooth.

Claims

1. A sodium-ion battery cathode material preparation system, characterized in that, It includes a raw material impurity remover (1), a constant speed stirrer (2), a sand mill (3), a spray dryer (4), a sintering furnace (5), an air jet mill (6), and a waste recycling unit (7) connected in sequence; wherein, a water bath is provided outside the constant speed stirrer (2); the water bath includes a circulating water jacket.

2. The sodium-ion battery cathode material preparation system according to claim 1, characterized in that, The constant speed mixer (2) is connected to a peristaltic pump so that the constant speed mixer (2) can uniformly mix different raw materials.

3. The sodium-ion battery cathode material preparation system according to claim 1, characterized in that, The sand mill (3) is connected to a first temperature-controlled pure water machine (8); the spray dryer (4) is connected to a second temperature-controlled pure water machine (9) with a spray gun.

4. The sodium-ion battery cathode material preparation system according to claim 1, characterized in that, The sand mill (3) includes a feed hopper and a grinding hopper, and a diaphragm pump is used to transport materials from the feed hopper to the grinding hopper.

5. The sodium-ion battery cathode material preparation system according to claim 1, characterized in that, A first delivery pump (10) is connected between the constant speed stirrer (2) and the sand mill (3), and a second delivery pump (11) is connected between the sand mill (3) and the spray dryer (4). Both the first delivery pump (10) and the second delivery pump (11) are diaphragm pumps.

6. The sodium-ion battery cathode material preparation system according to claim 1, characterized in that, A first vibrating screen (12) is connected between the spray dryer (4) and the sintering furnace (5), and a second vibrating screen (13) is connected between the sintering furnace (5) and the air jet mill (6).

7. The sodium-ion battery cathode material preparation system according to claim 1, characterized in that, The waste recycling unit (7) is connected to the constant speed stirrer (2), the spray dryer (4) and the air jet mill (6), and the waste recycling unit (7) has a solid-liquid separation function.

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