CN-224202204-U - Pretreatment sagger and sintering equipment

Abstract

The utility model relates to the technical field of lithium battery anode materials, and discloses a pretreatment sagger and sintering equipment, wherein the pretreatment sagger comprises a sagger body; the lithium layer is arranged at the bottom of the sagger body and is suitable for preventing lithium from being absorbed by the sagger body in the sintering process, and the lithium layer is made of one of lithium carbonate, lithium hydroxide or lithium oxide and is fixed at the bottom of the sagger body. The sintering equipment comprises a sintering furnace, a sagger bearing frame arranged in the sintering furnace and used for fixing and arranging a plurality of pretreatment saggers, and a gas circulation system used for introducing inert gas or reducing gas into the furnace in the sintering process so as to prevent lithium from oxidizing. The existence of the lithium layer can reduce the direct contact between the sagger body and lithium, thereby reducing corrosion and abrasion of the sagger and prolonging the service life of the sagger.

Inventors

• XU KAIHUA
• WANG GUOQING
• LIU YAN
• CHEN YUJUN
• ZHANG WENYAN
• MA CHI
• ZHANG YETAO
• ZHAO DE

Assignees

• 格林美（无锡）能源材料有限公司

Dates

Publication Date

20260505

Application Date

20250326

Claims (9)

1. 1. A pretreatment sagger which comprises a box body, characterized by comprising the following steps: A sagger body (1); The lithium layer (2) is arranged at the bottom of the sagger body (1) and is suitable for preventing lithium from being absorbed by the sagger body (1) in the sintering process; the lithium layer (2) is made of one of lithium carbonate, lithium hydroxide or lithium oxide, and is fixed at the bottom of the sagger body (1); the bottom of the sagger body (1) is provided with groove structures (5), and the groove structures (5) are distributed in a grid shape.
2. 2. The pretreatment sagger according to claim 1, characterized in that the top edge of the sagger body (1) is provided with a sealing groove (3), and the sealing groove (3) is embedded with a sealing ring.
3. 3. The pretreatment sagger according to claim 1, characterized in that the outer surface of the sagger body (1) is coated with an oxidation-resistant coating.
4. 4. Pretreatment sagger according to claim 1, characterized in that the sagger body (1) side wall is provided with ribs (4).
5. 5. A sintering apparatus for processing the pretreatment sagger according to any one of the preceding claims 1 to 4, characterized by comprising: The sintering furnace comprises a heating device and a temperature control system; The sagger bearing frame is arranged in the sintering furnace and used for fixing and arranging a plurality of pretreatment saggers, and the sagger body (1) is connected with the sagger bearing frame in a matching way; And a gas circulation system for introducing an inert gas or a reducing gas into the furnace during sintering to prevent lithium oxidation.
6. 6. Sintering equipment according to claim 5, characterized in that the sagger carrier is provided with a positioning groove which is matched with the bottom shape of the pretreatment sagger, and the edge of the positioning groove is provided with a groove which is suitable for being clamped with the sagger body (1).
7. 7. Sintering apparatus according to claim 5, wherein the gas circulation system comprises a gas supply and an exhaust, the gas supply being adapted to regulate the gas flow and pressure.
8. 8. Sintering apparatus according to claim 5, characterized in that it further comprises detection means for monitoring the integrity and thickness of the pretreatment sagger bottom lithium layer (2).
9. 9. The sintering apparatus according to claim 8, wherein the detection device further comprises a viewing window adapted to view the sintering process.

Description

Pretreatment sagger and sintering equipment Technical Field The utility model relates to the technical field of lithium battery anode materials, in particular to a pretreatment sagger and sintering equipment. Background In the manufacture of lithium battery cathode materials, a sagger is a key tool in the sintering process and is used for bearing and heating the cathode materials. However, the limited cycle life of the sagger, especially when switching products or opening lines, presents problems with the use of a large number of entirely new saggers. The pore structure of the brand-new sagger absorbs lithium in the sintering process, so that the lithium content in the anode material is insufficient, the physicochemical indexes and electrochemical properties of a finished product, such as capacity reduction, cycle life shortening and the like, are influenced, a large number of micropores exist on the surface and inside of the brand-new sagger, lithium ions in the anode material can be absorbed by the pores in the high-temperature sintering process, the loss of lithium is caused, and under the high-temperature environment, the lithium can be subjected to chemical reaction with the sagger material to form stable compounds, so that the loss of lithium is further increased, and at the moment, lithium supplementing operation is needed. In the related art, lithium carbonate is generally used for lithium supplementation, the lithium carbonate price is higher, the lithium supplementing process needs to be controlled accurately, the production cost is increased, the additional process steps are needed for the lithium supplementing operation, the production period is prolonged, the production efficiency is influenced, lithium ions can not be completely recovered to be normal after lithium supplementation, and new impurities or defects can be introduced in the lithium supplementing process, so that the material performance is influenced. Disclosure of utility model In view of the above, the utility model provides a pretreatment sagger and sintering equipment to solve the problem that the lithium content is abnormal in the sintering process of the anode material. In a first aspect, the utility model provides a pretreatment sagger comprising: a sagger body; the lithium layer is arranged at the bottom of the sagger body and is suitable for preventing lithium from being absorbed by the sagger body in the sintering process; The lithium layer is made of one of lithium carbonate, lithium hydroxide or lithium oxide, and is fixed at the bottom of the sagger body. The lithium layer is arranged at the bottom of the sagger body, so that lithium can be effectively prevented from being absorbed by the sagger body in the sintering process, the loss of lithium is reduced, and the utilization rate of the lithium is ensured to be maximized. The lithium layer can prevent lithium from being absorbed by the sagger, so that chemical reaction in the sintering process is more stable, the sintering efficiency is improved, and the energy consumption is reduced. The lithium layer may be composed of one of lithium carbonate, lithium hydroxide or lithium oxide, and this flexibility allows the selection of the most appropriate material to optimize the sintering process according to specific process requirements. The lithium layer is fixed at the bottom of the sagger body, so that the production process is simplified, additional operation steps are reduced, and the production cost is reduced. By preventing loss of lithium, the lithium content of the final product is more stable, contributing to improving the quality and consistency of the product. The existence of the lithium layer can reduce the direct contact between the sagger body and lithium, thereby reducing corrosion and abrasion of the sagger and prolonging the service life of the sagger. In an alternative embodiment, the bottom of the sagger body is provided with groove structures, and the groove structures are distributed in a grid shape. The method has the beneficial effects that the adhesive force of the lithium layer is enhanced, the contact area between the bottom of the sagger and the lithium layer is increased by the grid-shaped groove structure, the lithium layer can be better fixed, the lithium layer is prevented from falling off or shifting in the sintering process, and the stability of the lithium layer is ensured. The grid-shaped structure is beneficial to uniformly distributing the lithium layer material in the grooves and avoiding local accumulation or loss, so that uniform release of lithium in the sintering process is ensured, and the consistency of product quality is improved. The grid-shaped groove structure can increase the surface area of the bottom of the sagger, is favorable for uniform conduction of heat, and avoids local overheating or uneven heat distribution, thereby improving sintering efficiency. In an alternative embodiment, a sealing groove is formed in the to