Production line and method of high-compaction sodium ion battery positive electrode material

Abstract

The invention discloses a production line and method of a high-compaction sodium-ion battery positive electrode material. The production line comprises a batching unit, a primary sintering unit, a secondary sintering unit and a blanking unit which are distributed and connected in sequence, the batching unit is used for performing automatic batching and high-speed mixing on multiple raw materials to form a mixed raw material, the primary sintering unit is used for sequentially performing primary sintering and primary crushing on the mixed raw material to form a primary crushed material, and the secondary sintering unit is divided into a group A and a group B which are respectively used for sequentially performing secondary sintering and secondary crushing on the primary crushed material; and the discharging unit is used for drying, mixing, discharging and packaging the secondary crushed material A and the secondary crushed material B in sequence, so that a finished product material is formed. According to the invention, two or more different particle sizes can be produced at the same time by using the same formula material, the particle size distribution is completed, and the yield and the production capacity are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sodium ion battery production, and in particular to a production line and method for a high-pressure compaction sodium ion battery positive electrode material. Background Art

[0002] Sodium-ion batteries have good application potential in electric bicycles, low-speed electric vehicles, logistics delivery vehicles, 3C, digital toys and other application scenarios due to their low cost, low-temperature performance and excellent fast charging performance. Among them, products such as electric bicycles, 3C, digital toys and other products have high requirements for battery volume energy density, so improving the volume energy density of the material can enhance the product competitiveness of sodium-ion batteries.

[0003] In the prior art, the production method of high-pressure compaction sodium-ion battery positive electrode materials is generally to produce one material first and then adjust the process to produce another material. This method is not only not suitable for the particle size grading of materials with different particle sizes, but also causes long-term stagnation of materials and wastes production capacity. Summary of the invention

[0004] The present invention provides a production line and method for high-pressure compaction sodium ion battery positive electrode materials that are suitable for a variety of particle size distributions and help improve production capacity, which can solve at least one of the above-mentioned technical problems.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A production line for high-pressure compaction sodium-ion battery positive electrode materials, comprising a batching unit, a primary sintering unit, a secondary sintering unit and a feeding unit which are sequentially distributed and connected;

[0007] The batching unit is used to automatically batch and mix multiple raw materials in proportion in sequence to form a mixed raw material, which is then transported to the primary sintering unit. The primary sintering unit is used to perform primary sintering and primary crushing on the mixed raw materials in sequence to form a primary crushed material. The primary crushed material is transported to the secondary sintering unit. The secondary sintering unit is divided into two groups, A and B, which are respectively used to perform secondary sintering and secondary crushing on the primary crushed material in sequence to form secondary crushed material A and secondary crushed material B, respectively. The secondary crushed material A and the secondary crushed material B are synchronously transported to the unloading unit, which is used to dry, mix, unload and package the secondary crushed material A and the secondary crushed material B in sequence to form a finished product material.

[0008] The output ratio of secondary crushed material A and secondary crushed material B is adjusted between the secondary sintering units of group A and group B by adjusting the number of loading pots, the loading pot amount or the sintering cycle to achieve particle size grading with different output ratios.

[0009] Furthermore, the batching unit includes a sodium source feeding station, a precursor feeding station and a high-speed mixer. The sodium source feeding station and the precursor feeding station batch the sodium source raw material and the precursor raw material in proportion through an automatic batching program preset by an automatic batching system, and simultaneously transport them to the high-speed mixer for high-speed mixing to form a mixed raw material.

[0010] Furthermore, the primary sintering unit includes a sintering potting mechanism, a sintering rotary line, a sintering first roller kiln, a sintering second roller kiln, a sintering rough crushing device and a sintering pulverizing device;

[0011] The mixed raw material is transported to the firing bowl mechanism via an upstream bin of a firing bowl, and the firing bowl mechanism synchronously transports the mixed raw material to the first roller kiln and the second roller kiln distributed side by side via the first firing rotary line, and sintering is performed once respectively. The sintering temperatures of the first roller kiln and the second roller kiln are both set to 850°C-920°C, and the constant temperature sintering time is both set to 6-20 hours to form a primary sintered material. The primary sintered material is synchronously transported to the first coarse crushing equipment and the first pulverizing equipment via the first firing rotary line in sequence for preliminary crushing and deep pulverization to form a primary pulverized material, and the pulverized particle size of the primary pulverized material is 5-8μm.

[0012] Furthermore, the primary sintering unit also includes a sintering and crushing downstream bin, which is connected to the sintering and crushing equipment and is provided with two feeding screws for conveying the received primary crushed materials to the A group secondary sintering unit and the B group secondary sintering unit respectively through the second sintering A bowl upstream bin and the second sintering B bowl upstream bin.

[0013] Furthermore, the group A secondary sintering unit includes a second-fired A loading mechanism, a second-fired A roller kiln, a second-fired A coarse crushing device and a second-fired A pulverizing device;

[0014] The primary crushed material is transported to the secondary fired A loading mechanism via the secondary fired A loading upstream bin, and the secondary fired A loading mechanism transports the primary crushed material to the secondary fired A roller kiln for secondary sintering. The sintering temperature of the secondary fired A roller kiln is set to 910°C-940°C, and the constant temperature sintering time is set to 6-20 hours to form secondary sintered material A. The secondary sintered material A is sequentially transported to the secondary fired A coarse crushing equipment and the secondary fired A crushing equipment for preliminary crushing and deep crushing to form secondary crushed material A. The crushed particle size of the secondary crushed material A is 10-12μm.

[0015] Furthermore, the group B secondary sintering unit includes a second-fired B loading mechanism, a second-fired B roller kiln, a second-fired B coarse crushing device and a second-fired B pulverizing device;

[0016] The primary crushed material is transported to the secondary sintered B loading mechanism via the secondary sintered B loading upstream bin, and the secondary sintered B loading mechanism transports the primary crushed material to the secondary sintered B roller kiln for secondary sintering. The sintering temperature of the secondary sintered B roller kiln is set to 880°C-910°C, and the constant temperature sintering time is set to 6-20 hours to form secondary sintered material B. The secondary sintered material B is sequentially transported to the secondary sintered B coarse crushing equipment and the secondary sintered B crushing equipment for preliminary crushing and deep crushing to form secondary crushed material B. The crushed particle size of the secondary crushed material B is 5.1-7.5μm.

[0017] Furthermore, the secondary sintering units of group A and group B share a secondary sintering rotary line, which is arranged along the periphery of the secondary sintering A roller kiln and the secondary sintering B roller kiln distributed side by side, and is connected between the secondary sintering loading mechanisms of groups A and B and the secondary sintering coarse crushing equipment of groups A and B, and is used to transport the primary crushed materials to the roller kilns of groups A and B for secondary sintering, and to transport the secondary sintered materials A and the secondary sintered materials B to the coarse crushing equipment of groups A and B, respectively.

[0018] Furthermore, the unloading unit includes a plowshare drying and mixing device and a packaging device. The second sintered A crushing device and the second sintered B crushing device are respectively connected to the plowshare drying and mixing device via the second sintered A crushing downstream bin and the second sintered B crushing downstream bin. The second sintered A crushing downstream bin and the second sintered B crushing downstream bin are both provided with weighing modules and feeding screws for performing particle size grading on secondary sintered materials A and secondary sintered materials B with different output ratios. The plowshare drying and mixing device is used to remove free water and mix the secondary crushed materials A and B to form finished materials. The finished materials are unloaded into the packaging device for packaging.

[0019] A method for producing a high-pressure sodium-ion battery positive electrode material is implemented using the production line for the high-pressure sodium-ion battery positive electrode material, comprising the following steps:

[0020] S1. The automatic batching system batches the sodium source raw material and the precursor raw material in proportion according to the preset automatic batching program, and mixes them at high speed to form a mixed raw material;

[0021] S2, the mixed raw materials are loaded into a first firing bowl mechanism, and transported to the first and second roller kilns of the first firing through a first firing rotary line, and sintered once respectively to form a primary sintered material. The primary sintered material is sequentially crushed and deeply crushed by a first firing coarse crushing device and a first firing pulverizing device to form a primary pulverized material, and the pulverized particle size of the primary pulverized material is 5-8 μm;

[0022] S3, the primary crushed materials are transported to the secondary sintering unit of group A and group B respectively. The output ratio of the secondary crushed material A to the secondary crushed material B is adjusted by adjusting the number of columns, the amount of the loading or the sintering cycle between the two groups of secondary sintering units A and B. When the output ratio is between 5:5-7:3, the compaction density of the pole piece is the highest and the cycle life of the battery cell is better. The preferred output ratio is 6:4;

[0023] The secondary crushed materials A and B formed by the two groups of secondary sintering units S4, A, and B are respectively accurately weighed and discharged to achieve particle size grading with different output ratios in turn, and the free water is removed and mixed in the plowshare drying and mixing equipment to form finished materials. The finished materials are discharged to the packaging equipment for packaging.

[0024] Furthermore, in the secondary sintering unit of group A in said S, the primary crushed material is loaded into the secondary sintering A loading mechanism, transported to the secondary sintering A roller kiln via the secondary sintering rotary line, and subjected to secondary sintering to form secondary sintered material A. The secondary sintered material A is sequentially subjected to preliminary crushing and deep crushing by the secondary sintering A rough crushing equipment and the secondary sintering A crushing equipment to form secondary crushed material A. The crushed particle size of the secondary crushed material A is 10-12 μm.

[0025] In the secondary sintering unit of group B, the primary crushed material is loaded into the secondary sintering B loading mechanism, transported to the secondary sintering B roller kiln via the secondary sintering rotary line, and subjected to secondary sintering to form secondary sintered material B. The secondary sintered material B is successively subjected to preliminary crushing and deep crushing by the secondary sintering B coarse crushing equipment and the secondary sintering B crushing equipment to form secondary crushed material B. The crushed particle size of the secondary crushed material B is 5.1-7.5μm.

[0026] The beneficial effects of the present invention are embodied in:

[0027] The present invention combines equipment layout with process to provide a production line and production method that can realize continuous large-scale production of high-pressure sodium-ion battery positive electrode materials. On the one hand, it can realize the same formula material, produce two or more different particle sizes at the same time, and complete the particle size grading, improve the yield rate, avoid long-term stagnation of materials, and improve production capacity; on the other hand, the various unit modules in the production line are processed in an orderly manner to realize the fully automated manufacturing of the industry, reduce manual operation costs, and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0029] Figure 1It is a layout diagram of a production line for high-pressure sodium-ion battery positive electrode materials according to an embodiment of the present invention.

[0030] Figure 2 It is a schematic flow chart of a method for producing a positive electrode material for a high-pressure sodium-ion battery according to an embodiment of the present invention.

[0031] Figure 3 It is a process flow chart of a method for producing a positive electrode material for a high-pressure sodium-ion battery according to an embodiment of the present invention.

[0032] The components in the attached drawings are marked as follows: 1. Sodium source feeding station; 2. Precursor feeding station; 3. High-speed mixer; 4. First-fired loading mechanism; 5. First-fired rotary line; 6. First-fired first roller kiln; 7. First-fired second roller kiln; 8. First-fired coarse crushing equipment; 9. First-fired pulverizing equipment; 10. First-fired pulverizing downstream bin; 11. Second-fired A loading mechanism; 12. Second-fired B loading mechanism; 13. Second-fired rotary line; 14. Second-fired A roller kiln; 15. Second-fired B roller kiln; 16. Second-fired A coarse crushing equipment; 17. Second-fired B coarse crushing equipment; 18. Second-fired A pulverizing equipment; 19. Second-fired B pulverizing equipment; 20. Plowshare drying and mixing equipment; 21. Packaging equipment. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described 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. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] It should be noted that if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, "multiple" refers to more than two.

[0035] It should be noted that those skilled in the art can understand that all or part of the steps implemented in the embodiments of the present invention can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented by hardware, it can be implemented in whole or in part in the form of purchased standard parts or modified parts. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions.

[0036] See also Figure 1 , an embodiment of the present invention provides a production line for a high-pressure sodium-ion battery positive electrode material, comprising a batching unit, a primary sintering unit, a secondary sintering unit and a feeding unit which are sequentially distributed and connected;

[0037] The batching unit is used to automatically batch and mix multiple raw materials in proportion in sequence to form a mixed raw material, which is then transported to the primary sintering unit. The primary sintering unit is used to perform primary sintering and primary crushing on the mixed raw materials in sequence to form a primary crushed material. The primary crushed material is transported to the secondary sintering unit. The secondary sintering unit is divided into two groups, A and B, which are respectively used to perform secondary sintering and secondary crushing on the primary crushed material in sequence to form secondary crushed material A and secondary crushed material B, respectively. The secondary crushed material A and the secondary crushed material B are synchronously transported to the unloading unit, which is used to dry, mix, unload and package the secondary crushed material A and the secondary crushed material B in sequence to form a finished product material.

[0038] The output ratio of secondary crushed material A and secondary crushed material B is adjusted between the secondary sintering units of group A and group B by adjusting the number of loading pots, the loading pot amount or the sintering cycle to achieve particle size grading with different output ratios.

[0039] After this production line, when the output ratio is between 5:5-7:3, the pole piece compaction density is the highest and the battery cell cycle life is better. The optimal output ratio is 6:4.

[0040] If the particle size distribution of 7:3 is achieved, the secondary sintering unit of group A uses 6 rows of furnaces, and the secondary sintering unit of group B uses 4 rows of furnaces. The sintering cycle of the secondary sintering unit of group A is increased by 20% compared with that of the secondary sintering unit of group B, and the potting capacity of the secondary sintering unit of group A is increased by 30% compared with that of the secondary sintering unit of group B, then the production capacity can be matched to 7:3;

[0041] If the particle size distribution of 6:4 is achieved, the secondary sintering unit of group A uses 6 rows of furnaces, and the secondary sintering unit of group B uses 4 rows of furnaces. The sintering cycle and loading volume of the secondary sintering units of group A and group B are equivalent, so the production capacity can be matched to 6:4;

[0042] If a 5:5 particle size distribution is achieved, the same material can be fed into the secondary sintering units of group A and group B at the same time.

[0043] See also Figure 1 and Figure 3 In this embodiment, the batching unit includes a sodium source feeding station 1, a precursor feeding station 2 and a high-speed mixer 3. The sodium source feeding station 1 and the precursor feeding station 2 are used in an automatic batching program preset by an automatic batching system to batch the sodium source raw material and the precursor raw material in proportion, and are simultaneously transported to the high-speed mixer 3 for high-speed mixing to form a mixed raw material.

[0044] See also Figure 1 and Figure 3 In this embodiment, the primary sintering unit includes a sintering potting mechanism 4, a sintering rotary line 5, a sintering first roller kiln 6, a sintering second roller kiln 7, a sintering rough crushing device 8 and a sintering pulverizing device 9;

[0045] The mixed raw material is transported to the firing bowl mechanism 4 via an upstream bin of a firing bowl, and the firing bowl mechanism 4 synchronously transports the mixed raw material to the first roller kiln 6 and the second roller kiln 7 distributed side by side via the firing rotary line 5, and sintering is performed once respectively. The sintering temperatures of the first roller kiln 6 and the second roller kiln 7 are both set to 850°C-920°C, and the constant temperature sintering time is both set to 6-20 hours to form a primary sintered material. The primary sintered material is synchronously transported to the first coarse crushing equipment 8 and the first pulverizing equipment 9 via the firing rotary line 5 in sequence for preliminary crushing and deep pulverization to form a primary pulverized material, and the pulverized particle size of the primary pulverized material is 5-8μm.

[0046] See also Figure 1 and Figure 3 In this embodiment, the primary sintering unit also includes a sintering and crushing downstream bin 10, which is connected to the sintering and crushing equipment 9 and is provided with two feeding screws for conveying the received primary crushed materials to the A group secondary sintering unit and the B group secondary sintering unit respectively through the second sintering A bowl upstream bin and the second sintering B bowl upstream bin.

[0047] See also Figure 1 and Figure 3 In this embodiment, the group A secondary sintering unit includes a second-fired A loading mechanism 11, a second-fired A roller kiln 14, a second-fired A coarse crushing device 16 and a second-fired A pulverizing device 18;

[0048] The primary crushed material is transported to the secondary fired A loading mechanism 11 via the secondary fired A loading upstream bin, and the secondary fired A loading mechanism 11 transports the primary crushed material to the secondary fired A roller kiln 14 for secondary sintering. The sintering temperature of the secondary fired A roller kiln 14 is set to 910°C-940°C, and the constant temperature sintering time is set to 6-20 hours to form secondary sintered material A. The secondary sintered material A is sequentially transported to the secondary fired A coarse crushing equipment 16 and the secondary fired A pulverizing equipment 18 for preliminary crushing and deep pulverizing to form secondary pulverized material A. The pulverized particle size of the secondary pulverized material A is 10-12μm.

[0049] See also Figure 1 and Figure 3 In this embodiment, the group B secondary sintering unit includes a second-fired B loading mechanism 12, a second-fired B roller kiln 15, a second-fired B coarse crushing device 17 and a second-fired B pulverizing device 19;

[0050] The primary crushed material is transported to the secondary fired B loading mechanism 12 via the secondary fired B loading upstream bin, and the secondary fired B loading mechanism 12 transports the primary crushed material to the secondary fired B roller kiln 15 for secondary sintering. The sintering temperature of the secondary fired B roller kiln 15 is set to 880°C-910°C, and the constant temperature sintering time is set to 6-20 hours to form a secondary sintered material B. The secondary sintered material B is sequentially transported to the secondary fired B coarse crushing equipment 17 and the secondary fired B crushing equipment 19 for preliminary crushing and deep crushing to form a secondary crushed material B. The crushed particle size of the secondary crushed material B is 5.1-7.5μm.

[0051] See also Figure 1 and Figure 3 In this embodiment, the secondary sintering unit of group A and the secondary sintering unit of group B share a secondary sintering rotary line 13, which is arranged along the periphery of the secondary sintering A roller kiln 14 and the secondary sintering B roller kiln 15 distributed side by side, and is connected between the secondary sintering loading mechanisms of groups A and B and the secondary sintering coarse crushing equipment of groups A and B, and is used to transport the primary crushed materials to the roller kilns of groups A and B for secondary sintering, and to transport the secondary sintered materials A and the secondary sintered materials B to the coarse crushing equipment of groups A and B, respectively.

[0052] See also Figure 1 and Figure 3In this embodiment, the unloading unit includes a plowshare drying and mixing device 20 and a packaging device 21. The second sintering A crushing device 18 and the second sintering B crushing device 19 are respectively connected to the plowshare drying and mixing device 20 via the second sintering A crushing downstream bin and the second sintering B crushing downstream bin. The second sintering A crushing downstream bin and the second sintering B crushing downstream bin are both provided with weighing modules and feeding screws for performing particle size grading on secondary sintering materials A and secondary sintering materials B with different output ratios. The plowshare drying and mixing device 20 is used to remove free water and mix the secondary crushed materials A and B to form finished materials. The finished materials are unloaded into the packaging device 21 for packaging.

[0053] In some specific embodiments of the present application, the first-fired sagger loading mechanism 4, the second-fired A-fired sagger loading mechanism 11 and the second-fired B-fired sagger loading mechanism 12 may adopt saggers of the same model and style, such as 330*330*100mm. The sagger size may also be selected according to the actual production line specifications, and the present invention does not make any special limitation on this.

[0054] In some specific embodiments of the present application, the first burn coarse crushing equipment 8, the first burn pulverizing equipment 9, the second burn A coarse crushing equipment 16, the second burn B coarse crushing equipment 17, the second burn A pulverizing equipment 18 and the second burn B pulverizing equipment 19 include any pulverizing method commonly used in the art, such as mechanical pulverizing, air flow pulverizing or impact crushing, etc., and the present invention does not make any special limitation on this.

[0055] In some specific embodiments of the present application, the first-firing first roller kiln 6, the second-firing A roller kiln 14 and the second-firing B roller kiln 15 can be made of atmospheric furnaces or atmosphere furnaces. The first-firing first roller kiln 6 is preferably between 850°C and 920°C and between 6-20 hours. The second-firing A roller kiln 14 is preferably between 910-940°C and between 6-20 hours. The second-firing B roller kiln 15 is preferably between 880-910°C and between 6-20 hours. The sintering temperature and constant temperature sintering time can be set according to actual production conditions, and the present invention does not make any special limitation on this.

[0056] See also Figure 2-Figure 3 The embodiment of the present invention further provides a method for producing a high-pressure sodium-ion battery positive electrode material, which is implemented using the production line of the high-pressure sodium-ion battery positive electrode material, and includes the following steps:

[0057] S1. The automatic batching system batches the sodium source raw material and the precursor raw material in proportion according to the preset automatic batching program, and mixes them at high speed to form a mixed raw material;

[0058] S2, the mixed raw material is loaded into a firing bowl mechanism 4, and transported to a first roller kiln 6 and a second roller kiln 7 through a firing rotary line 5, and sintered once to form a primary sintered material. The primary sintered material is sequentially crushed and deeply crushed by a primary crushing device 8 and a primary crushing device 9 to form a primary crushed material, and the crushed particle size of the primary crushed material is 5-8μm;

[0059] S3, the primary crushed materials are transported to the secondary sintering unit of group A and group B respectively. The output ratio of the secondary crushed material A to the secondary crushed material B is adjusted by adjusting the number of columns, the amount of the loading or the sintering cycle between the two groups of secondary sintering units A and B. When the output ratio is between 5:5-7:3, the compaction density of the pole piece is the highest and the cycle life of the battery cell is better. The preferred output ratio is 6:4;

[0060] The secondary crushed materials A and B formed by the two groups of secondary sintering units S4, A, and B are respectively accurately weighed and discharged to achieve particle size distribution with different output ratios in turn, and free water is removed and mixed in the plowshare drying and mixing equipment 20 to form finished materials. The finished materials are discharged to the packaging equipment 21 for packaging.

[0061] The high-compacted material preparation provided by the method is to mix two materials with the same formula and structure in the finished product according to the mass ratio, that is, the output ratio, through the particle size grading method, so as to improve the compaction performance of the electrode material after being prepared into a pole piece.

[0062] Specifically, the material composition is a layered transition metal oxide, the general formula of which is Na a Cu x Fe y Mn z M 1-x-y-z O2. Wherein, M is an element doped to replace the transition metal, and M can be one or more of Li, Ni, Mg, Zn, Co, Al, Zr, and Ti; 0.5<a≤1.1, 0.1<x≤0.3, 0<y≤0.5, 0<z≤0.5, 0<1-xyz≤0.5; the values ​​of a, x, y, and z satisfy the charge balance of the chemical formula.

[0063] In some specific embodiments of the present application, the raw material containing Na, Cu, Fe and Mn elements can be a mixed material of a sodium source and copper-iron-manganese hydroxide, or a mixed material containing a sodium source, a copper source, an iron source and a manganese source, wherein the sodium source is a sodium-containing compound, the copper source is a copper-containing compound, the iron source is an iron-containing compound, and the manganese source is a manganese-containing compound. The types of compounds include, for example, oxides, carbonates or nitrates, etc., and the present invention does not make any special limitations on this.

[0064] It can be understood that when the raw material containing Na, Cu, Fe and Mn elements also includes the M element, a mixed material of a sodium source and copper-iron-manganese hydroxide doped with M can be used, or a mixed material containing a sodium source, a copper source, an iron source, a manganese source and an M-containing compound can be used.

[0065] See also Figure 1 and Figure 3 In this embodiment, in the S3, in the secondary sintering unit of group A, the primary crushed material is loaded into the secondary sintering A loading mechanism 11, and is transported to the secondary sintering A roller kiln 14 via the secondary sintering rotary line 13 for secondary sintering to form secondary sintered material A. The secondary sintered material A is sequentially crushed and deeply crushed by the secondary sintering A rough crushing device 16 and the secondary sintering A crushing device 18 to form secondary crushed material A. The crushed particle size of the secondary crushed material A is 10-12 μm;

[0066] In the secondary sintering unit of group B, the primary crushed material is loaded into the secondary sintering B loading mechanism 12, transported to the secondary sintering B roller kiln 15 via the secondary sintering rotary line 13, and subjected to secondary sintering to form secondary sintered material B. The secondary sintered material B is sequentially subjected to preliminary crushing and deep crushing by the secondary sintering B coarse crushing equipment 17 and the secondary sintering B crushing equipment 19 to form secondary crushed material B. The crushed particle size of the secondary crushed material B is 5.1-7.5μm.

[0067] Below, the present invention will conduct comparative analysis in combination with specific experimental cases:

[0068] Table 1. Physical and chemical properties of comparative examples and embodiments

[0069]

[0070]

[0071] Table 2. Pole piece compaction performance of comparative examples and examples

[0072] experiment Pole compaction density / (g / cm3) Comparative Example 1 3.18 Comparative Example 2 3.23 Example 1 3.37 Example 2 3.35 Example 3 3.31

[0073] As shown in Tables 1 and 2 above, the above experimental materials were used to prepare positive electrode sheets with a width of 200 mm. The DYG-703B-Φ300mm*350mm / 100T roller press was used with the same roller pressure, i.e., 30 tons, to roll the above 5 groups of electrode sheets. After rolling, the compaction density was tested. It can be seen from Tables 1 and 2 above that the compaction density can be increased from 3.18 g / cm2 of Comparative Example 1 to 3.18 g / cm2 of Comparative Example 1 through particle size grading. 3 Increased to 3.37 g / cm in Experimental Example 1 3 , and the method is suitable for industrial large-scale production.

[0074] In summary, the present invention provides a production line and production method that can realize continuous large-scale production of high-pressure sodium-ion battery positive electrode materials by combining equipment layout and process. On the one hand, it can realize the same formula material, produce two or more different particle sizes at the same time, and complete the particle size grading, improve the yield rate, avoid long-term stagnation of materials, and improve production capacity; on the other hand, the unit modules in the production line are processed in an orderly manner to realize the fully automated manufacturing of the industry, reduce manual operation costs, and improve production efficiency.

[0075] It should be understood that the examples and implementation modes described herein are for illustrative purposes only and are not intended to limit the present invention. Those skilled in the art may make various modifications or changes based on the examples and implementation modes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A production line for high-pressure sodium-ion battery positive electrode materials, characterized in that: It includes a batching unit, a primary sintering unit, a secondary sintering unit and a feeding unit which are sequentially distributed and connected; The batching unit is used to automatically batch and mix multiple raw materials in proportion in sequence to form a mixed raw material, which is then transported to the primary sintering unit. The primary sintering unit is used to perform primary sintering and primary crushing on the mixed raw materials in sequence to form a primary crushed material. The primary crushed material is transported to the secondary sintering unit. The secondary sintering unit is divided into two groups, A and B, which are respectively used to perform secondary sintering and secondary crushing on the primary crushed material in sequence to form secondary crushed material A and secondary crushed material B, respectively. The secondary crushed material A and the secondary crushed material B are synchronously transported to the unloading unit, which is used to dry, mix, unload and package the secondary crushed material A and the secondary crushed material B in sequence to form a finished product material. The output ratio of secondary crushed material A and secondary crushed material B is adjusted between the secondary sintering units of group A and group B by adjusting the number of loading pots, the loading pot amount or the sintering cycle to achieve particle size grading with different output ratios.

2. The production line of high-density sodium-ion battery positive electrode material according to claim 1, characterized in that: The batching unit comprises a sodium source feeding station (1), a precursor feeding station (2) and a high-speed mixer (3). The sodium source feeding station (1) and the precursor feeding station (2) are used to batch the sodium source raw material and the precursor raw material in proportion according to an automatic batching program preset in an automatic batching system, and are simultaneously transported to the high-speed mixer (3) for high-speed mixing to form a mixed raw material.

3. The production line of high-density sodium-ion battery positive electrode material according to claim 1, characterized in that: The primary sintering unit comprises a sintering and loading mechanism (4), a sintering rotary line (5), a sintering first roller kiln (6), a sintering second roller kiln (7), a sintering coarse crushing device (8) and a sintering pulverizing device (9); The mixed raw material is transported to the one-firing bowl mechanism (4) via the one-firing bowl upstream bin, and the one-firing bowl mechanism (4) synchronously transports the mixed raw material to the one-firing first roller kiln (6) and the one-firing second roller kiln (7) which are arranged side by side via the one-firing rotary line (5), and sintering is performed once respectively. The sintering temperature of the one-firing first roller kiln (6) and the one-firing second roller kiln (7) are both set to 850°C-920°C, and the constant temperature sintering time is both set to 6-20 hours to form a primary sintered material. The primary sintered material is synchronously transported to the one-firing coarse crushing equipment (8) and the one-firing pulverizing equipment (9) in sequence via the one-firing rotary line (5) for preliminary crushing and deep pulverization to form a primary pulverized material, and the pulverized particle size of the primary pulverized material is 5-8μm.

4. The production line of high-density sodium-ion battery positive electrode material according to claim 3, characterized in that: The primary sintering unit also includes a sintering and crushing downstream bin (10), which is connected to the sintering and crushing equipment (9) and is provided with two feeding screws for conveying the received primary crushed materials to the A group secondary sintering unit and the B group secondary sintering unit respectively through the second sintering A bowl upstream bin and the second sintering B bowl upstream bin.

5. The production line of high-density sodium-ion battery positive electrode material according to claim 1, characterized in that: The group A secondary sintering unit comprises a second-fired A loading mechanism (11), a second-fired A roller kiln (14), a second-fired A rough crushing device (16) and a second-fired A pulverizing device (18); The primary crushed material is transported to the secondary fired A loading mechanism (11) via the secondary fired A loading upstream bin. The secondary fired A loading mechanism (11) transports the primary crushed material to the secondary fired A roller kiln (14) for secondary sintering. The sintering temperature of the secondary fired A roller kiln (14) is set to 910°C-940°C, and the constant temperature sintering time is set to 6-20 hours to form secondary sintered material A. The secondary sintered material A is sequentially transported to the secondary fired A rough crushing device (16) and the secondary fired A crushing device (18) for preliminary crushing and deep crushing to form secondary crushed material A. The crushed particle size of the secondary crushed material A is 10-12 μm.

6. The production line of high-density sodium-ion battery positive electrode material according to claim 5, characterized in that: The group B secondary sintering unit comprises a second-fired B loading mechanism (12), a second-fired B roller kiln (15), a second-fired B rough crushing device (17) and a second-fired B pulverizing device (19); The primary crushed material is transported to the secondary sintered B loading mechanism (12) via the secondary sintered B loading upstream bin. The secondary sintered B loading mechanism (12) transports the primary crushed material to the secondary sintered B roller kiln (15) for secondary sintering. The sintering temperature of the secondary sintered B roller kiln (15) is set to 880°C-910°C, and the constant temperature sintering time is set to 6-20 hours to form a secondary sintered material B. The secondary sintered material B is sequentially transported to the secondary sintered B rough crushing equipment (17) and the secondary sintered B crushing equipment (19) for preliminary crushing and deep crushing to form a secondary crushed material B. The crushed particle size of the secondary crushed material B is 5.1-7.5μm.

7. The production line of high-density sodium-ion battery positive electrode material according to claim 6, characterized in that: The secondary sintering units of group A and group B share a secondary sintering rotary line (13), which is arranged along the periphery of the secondary sintering roller kiln (14) and the secondary sintering roller kiln (15) arranged side by side, and is connected between the secondary sintering loading mechanisms of groups A and B and the secondary sintering coarse crushing equipment of groups A and B, and is used to transport the primary crushed materials to the roller kilns of groups A and B for secondary sintering, and to transport the secondary sintered materials A and the secondary sintered materials B to the coarse crushing equipment of groups A and B, respectively.

8. The production line of high-density sodium-ion battery positive electrode material according to claim 6, characterized in that: The unloading unit comprises a plowshare drying and mixing device (20) and a packaging device (21); the second sintered A crushing device (18) and the second sintered B crushing device (19) are respectively connected to the plowshare drying and mixing device (20) via a second sintered A crushing downstream bin and a second sintered B crushing downstream bin; the second sintered A crushing downstream bin and the second sintered B crushing downstream bin are both provided with a weighing module and a feeding screw for performing particle size grading on secondary sintered materials A and secondary sintered materials B with different output ratios; the plowshare drying and mixing device (20) is used for removing free water from the secondary crushed materials A and the secondary crushed materials B and mixing them to form finished materials; the finished materials are unloaded into the packaging device (21) for packaging.

9. A method for producing a high-density sodium-ion battery positive electrode material, which is implemented by using a production line for a high-density sodium-ion battery positive electrode material according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. The automatic batching system batches the sodium source raw material and the precursor raw material in proportion according to a preset automatic batching program, and mixes them at a high speed to form a mixed raw material; S2, the mixed raw material is loaded into a firing bowl mechanism (4), and transported to a first roller kiln (6) and a second roller kiln (7) via a firing rotary line (5), and sintered once to form a primary sintered material. The primary sintered material is sequentially subjected to a primary crushing device (8) and a primary crushing device (9) for preliminary crushing and deep crushing to form a primary crushed material, and the crushed particle size of the primary crushed material is 5-8 μm; S3, the primary crushed materials are transported to the secondary sintering unit of group A and group B respectively. The output ratio of the secondary crushed material A to the secondary crushed material B is adjusted by adjusting the number of columns, the amount of the loading or the sintering cycle between the two groups of secondary sintering units A and B. When the output ratio is between 5:5-7:3, the compaction density of the pole piece is the highest and the cycle life of the battery cell is better. The preferred output ratio is 6:4; The secondary crushed materials A and B formed by the two groups of secondary sintering units S4, A and B are respectively accurately weighed and discharged to achieve particle size distribution with different output ratios in turn, and free water is removed and mixed in the plowshare drying and mixing equipment (20) to form finished materials. The finished materials are discharged to the packaging equipment (21) for packaging.

10. The production line of high-density sodium-ion battery positive electrode material according to claim 9, characterized in that: In the above S3, in the secondary sintering unit of group A, the primary crushed material is loaded into the secondary sintering A loading mechanism (11), transported to the secondary sintering A roller kiln (14) via the secondary sintering rotary line (13), and subjected to secondary sintering to form secondary sintered material A. The secondary sintered material A is sequentially subjected to preliminary crushing and deep crushing by the secondary sintering A rough crushing device (16) and the secondary sintering A crushing device (18) to form secondary crushed material A. The crushed particle size of the secondary crushed material A is 10-12 μm. In the secondary sintering unit of group B, the primary crushed material is loaded into the secondary sintering B loading mechanism (12), transported to the secondary sintering B roller kiln (15) via the secondary sintering rotary line (13), and subjected to secondary sintering to form secondary sintered material B. The secondary sintered material B is sequentially subjected to preliminary crushing and deep crushing by the secondary sintering B coarse crushing equipment (17) and the secondary sintering B crushing equipment (19) to form secondary crushed material B. The crushed particle size of the secondary crushed material B is 5.1-7.5 μm.

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