A novel graphite sagger for lithium iron phosphate sintering

Abstract

This utility model proposes a novel graphite sagger for lithium iron phosphate sintering, relating to the technical field of lithium iron phosphate production equipment. It includes a graphite sagger body with limiting grooves formed on the four sides of the open top of the sagger body. Support blocks that cooperate with the limiting grooves are provided around the bottom wall of the sagger body, and a gap is provided between the support blocks and the bottom of the limiting grooves. This application can solve the problems of traditional graphite saggers having relatively smooth surfaces, making them prone to tilting or falling during stacking, affecting production safety, and limiting the exhaust and intake reactions within the sagger.

Description

Technical Field

[0001] This utility model relates to the technical field of lithium iron phosphate production equipment, specifically to a novel graphite sagger for lithium iron phosphate sintering. Background Technology

[0002] Lithium iron phosphate (LFP) is a compound widely used in cathode materials for lithium-ion batteries. Due to its high safety, good cycle performance, and low cost, it has become an important choice for power batteries and energy storage batteries. The production process of LFP typically includes precursor preparation, mixing, drying, sintering, and pulverization. Among these, sintering is a key step in the synthesis of LFP materials, directly affecting its crystal structure, particle morphology, and electrochemical performance.

[0003] During sintering, lithium iron phosphate (LFP) materials require solid-state reactions at high temperatures to form a crystal structure with excellent properties. To ensure temperature uniformity and material quality during sintering, LFP materials are typically sintered in a sagger. Traditional graphite saggers are a common choice in sintering processes due to their high-temperature resistance and good thermal conductivity. However, the smooth surface of traditional graphite saggers makes them prone to tilting or falling when stacked, affecting production safety. Furthermore, when stacked high, the venting and intake reactions within the sagger are somewhat restricted, leading to a decrease in sintering quality. Therefore, this application proposes a novel graphite sagger for LFP sintering. Utility Model Content

[0004] To overcome the problems in the background technology, this utility model provides a novel graphite sagger for lithium iron phosphate sintering, which solves the problems that the surface of traditional graphite saggers is relatively smooth, making them prone to tilting or falling when stacked, affecting production safety, and limiting the exhaust and intake reactions inside the sagger.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0006] A novel graphite sagger for lithium iron phosphate sintering includes a graphite sagger body. A limiting groove is formed on the four sides of the open top of the graphite sagger body. Support blocks that cooperate with the limiting groove are provided around the bottom wall of the graphite sagger body, and there is a gap between the support blocks and the bottom of the limiting groove.

[0007] Furthermore, a vent hole is provided in the center of the bottom wall of the graphite bowl, and a vent column flush with the opening of the bowl is provided inside the graphite bowl and connected to the vent hole.

[0008] Furthermore, the ventilation column has uniformly distributed through holes on its sidewall.

[0009] The beneficial effects of this utility model are:

[0010] The graphite bowl body of this application has a limiting groove on the four sides of the open top. The bottom wall of the graphite bowl body is provided with support blocks that cooperate with the limiting groove, so that it is not easy to move after stacking, which improves the stability of stacking and increases the air permeability. A vent hole is opened in the center of the bottom wall of the graphite bowl body. A vent column flush with the opening of the bowl body is provided inside the graphite bowl body and connected to the vent hole, which helps to improve the gas exchange efficiency during the sintering process, thereby improving the sintering quality of lithium iron phosphate material. Attached Figure Description

[0011] To clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments are explained.

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0013] Figure 2 This is a side view of the structure of this utility model;

[0014] Figure 3 This is a schematic diagram of the bottom structure of this utility model;

[0015] Figure 4 This is a schematic diagram of the stacking structure of this utility model;

[0016] Figure 5 This is a schematic diagram of the stacked side structure of this utility model.

[0017] 1-Graphite bowl body, 2-Limiting groove, 3-Support block, 4-Ventilation hole, 5-Ventilation column, 51-Through hole. Detailed Implementation

[0018] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, so as to facilitate the understanding of those skilled in the art.

[0019] This utility model discloses a novel graphite sagger for lithium iron phosphate sintering. (See reference...) Figure 1-5 A novel graphite sagger for lithium iron phosphate sintering includes a graphite sagger body 1, which is resistant to high temperatures and has good thermal conductivity. The top opening of the graphite sagger body 1 has a limiting groove 2 on its four sides. The bottom wall of the graphite sagger body 1 is provided with support blocks 3 that cooperate with the limiting groove 2, so that the graphite sagger body 1 is not easy to move after stacking, thus improving the stability of stacking. There is a gap between the support block 3 and the bottom of the limiting groove 2, which increases the air permeability after stacking and is beneficial to the exhaust reaction and intake reaction in the sagger during sintering.

[0020] See Figure 1-5A ventilation hole 4 is provided in the center of the bottom wall of the graphite bowl 1. A ventilation column 5, which is flush with the opening of the bowl, is provided inside the graphite bowl 1 and connected to the ventilation hole 4. Through holes 51 are uniformly provided on the side wall of the ventilation column 5, which helps to improve the gas exchange efficiency in the center of the graphite bowl 1 during the sintering process, thereby improving the sintering quality of lithium iron phosphate material.

[0021] Work process:

[0022] The mixed and dried lithium iron phosphate precursor material is uniformly loaded into a graphite crucible 1. The loading amount of material in the crucible needs to be reasonably controlled to ensure gas flow and temperature uniformity during sintering. The loaded graphite crucible 1 is stacked in the sintering furnace at a certain height, with the support block 3 and the limiting groove 2 working together. The sintering furnace gradually heats up according to the preset heating curve until the target temperature required for sintering is reached. Due to its excellent thermal conductivity, the graphite crucible can quickly transfer heat, causing the material temperature in the crucible to rise uniformly. It is maintained at the target temperature for a period of time to promote the crystal phase transformation and particle growth of lithium iron phosphate, forming an ideal crystal structure. During the sintering process, the material will release a small amount of water vapor and gaseous byproducts, which are discharged through the gap between the support block 3 and the bottom of the limiting groove 2, as well as the ventilation column 5 and the through hole 51, to avoid the impact of gas accumulation on the sintering quality. At the same time, a suitable amount of gas absorption reaction is allowed to improve the material properties. After sintering, the lithium iron phosphate material in the graphite crucible is removed after the furnace temperature drops to a safe temperature.

[0023] 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 novel graphite sagger for lithium iron phosphate sintering, characterized in that: The invention includes a graphite bowl (1), with a limiting groove (2) formed on the four sides of the open top of the graphite bowl (1), and a support block (3) that cooperates with the limiting groove (2) is provided around the bottom wall of the graphite bowl (1), and there is a gap between the support block (3) and the bottom of the limiting groove (2).

2. The novel graphite sagger for lithium iron phosphate sintering according to claim 1, characterized in that: A ventilation hole (4) is provided in the center of the bottom wall of the graphite bowl (1), and a ventilation column (5) flush with the opening of the bowl is provided inside the graphite bowl (1) and connected to the ventilation hole (4).

3. The novel graphite sagger for lithium iron phosphate sintering according to claim 2, characterized in that: The ventilation column (5) has through holes (51) evenly distributed on its side wall.

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