Sintering sagger for lithium iron phosphate
By setting baffles and cover plates in the sintering sagger, the carbon content distribution was adjusted, which solved the problem of poor compounding of lithium iron phosphate particles, and achieved uniform mixing and improved physical properties.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI LIANGFU NEW ENERGY TECH CO LTD
- Filing Date
- 2025-04-11
- Publication Date
- 2026-04-28
AI Technical Summary
Lithium iron phosphate exhibits poor particle size distribution during sintering, resulting in poor material morphology and distribution, which affects its physical properties.
Baffles and covers are installed inside the sintering sagger to adjust the carbon content distribution on the inner surface of the sagger, making the mixing of lithium iron phosphate and carbon more uniform. The sintering sagger is divided into different compartments by multiple baffles, and vent holes are provided on the cover to maintain gas flow.
The uniform compounding of lithium iron phosphate particles was achieved, which improved the morphology and electrode arrangement of the material and enhanced the physical properties of lithium iron phosphate.
Smart Images
Figure CN224175656U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a sagger, specifically a sintering sagger for lithium iron phosphate. Background Technology
[0002] During the sintering process of lithium iron phosphate (LFP), organic materials such as sucrose, glucose, and polyethylene glycol are added as carbon sources. These organic materials decompose into carbon during sintering, forming a carbon coating layer on the surface of the LFP particles. The presence of this carbon coating layer hinders the primary particle growth and fusion, thus controlling the microstructure of the LFP. During sintering, the LFP precursor is heated unevenly; under the influence of gravity and thermal buoyancy, different parts of the crucible experience varying degrees of heating. The LFP material near the crucible wall has a higher carbon content, and the LFP particles exhibit a good mix of large and small sizes. The intermediate LFP material has a lower carbon content, larger LFP particles, poorer particle size distribution, and lower powder compaction density. The surface layer of the crucible has a high carbon content, smaller primary LFP particles, and the lowest powder compaction density. This uneven carbon distribution leads to different material morphologies and particle sizes, thus affecting the physical properties of LFP. Utility Model Content
[0003] The technical problem to be solved by this utility model is to overcome the defects in the existing technology of poor particle size distribution in the sintering process of lithium iron phosphate, which leads to poor material morphology and distribution, and to provide a sintering sagger for lithium iron phosphate.
[0004] The present invention solves the above-mentioned technical problems through the following technical solution:
[0005] This utility model provides a sintering sagger for lithium iron phosphate, including a sagger body, the sagger body including a bottom plate and a side plate fixedly connected to the bottom plate, the bottom plate and the side plate forming a receiving cavity for holding materials, the sintering sagger also including a partition and a cover plate, the partition dividing the receiving cavity into at least two independent chambers, the top surface of the partition being lower than the top surface of the side plate, and the cover plate covering the partition and located inside the receiving cavity;
[0006] The outer peripheral wall of the cover plate is provided with a first limiting structure, and the inner wall of the side plate is provided with a second limiting structure that matches the first limiting structure.
[0007] In this scheme, by setting baffles and cover plates in the receiving cavity of the sagger body, the carbon content distribution on the inner surface of the sagger is adjusted, so that the lithium iron phosphate in the sagger is mixed more evenly with carbon during the sintering process. This results in a better compounding effect of lithium iron phosphate particles of different sizes, and avoids the different morphology and electrode configuration of the obtained lithium iron phosphate material, which would affect the physical properties of lithium iron phosphate.
[0008] Preferably, there are multiple partitions. These partitions can be arranged within the receiving cavity in a manner such as perpendicular intersection, non-perpendicular intersection, ring arrangement, parallel arrangement, or non-parallel arrangement. The receiving cavity of the sagger body is divided into chambers with different numbers of compartments by the multiple partitions.
[0009] Preferably, the partition plate is integrally formed with the bottom plate and the side plate. The main body of the sagger can be a square structure, such as a square or a rectangle, or it can be a pentagonal prism, hexagonal prism, cylinder, or other shapes.
[0010] Preferably, the sagger body and the partition are made of graphite, alumina or silicon carbide.
[0011] And / or, the cover plate is made of one of graphite, alumina or silicon carbide.
[0012] Preferably, the cover plate is provided with multiple vent holes. The vent holes can be circular, elliptical, or square. The opening angle of the vent holes can be 30°-150°. By providing vent holes on the cover plate, gas flow during the material sintering process can be maintained, preventing gas from accumulating in the containment cavity and affecting the quality of the lithium iron phosphate particles.
[0013] Preferably, the first limiting structure is a protrusion, and the second limiting structure is a groove.
[0014] Furthermore, the depth of the groove recessed from the inner wall of the side plate to the outer wall is less than the length of the protrusion, and the width of the groove is greater than the width of the protrusion;
[0015] The distance by which the groove extends downward from the top surface of the side plate is no greater than the distance between the top surface of the side plate and the top surface of the partition.
[0016] There is a gap between the cover plate and the inner wall of the receiving cavity.
[0017] Furthermore, the side plate and the bottom plate are 15mm thick, the partition is 5mm thick, and the cover plate is 10mm thick;
[0018] And / or, the length, width and height of the receiving cavity are 300mm*300mm*165mm, the height of the partition is 115mm, and the side length of the cover is 295mm*295mm;
[0019] And / or, the depth, width, and height of the groove are 5mm, 10mm, and 50mm respectively, and the length, width, and thickness of the protrusion are 6.5mm, 8mm, and 10mm respectively.
[0020] Preferably, the surface of the separator is wavy. Setting the surface of the separator to be wavy can increase the contact area between the lithium iron phosphate in the crucible and the separator, further increasing the carbon content of the lithium iron phosphate material and making the compounding effect of lithium iron phosphate with different particle sizes better.
[0021] Preferably, the lower surface of the cover plate is wavy. Setting the lower surface of the cover plate to be wavy can increase the contact area between the lithium iron phosphate in the crucible and the cover plate, further increasing the carbon content of the lithium iron phosphate material and making the compounding effect of lithium iron phosphate with different particle sizes better.
[0022] Preferably, the partition plate is provided with through holes to increase the fluidity of lithium iron phosphate materials in different chambers during sintering, thereby improving the compounding effect of lithium iron phosphate with different particle sizes.
[0023] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model.
[0024] The positive and progressive effects of this utility model are as follows: By setting a partition and a cover plate in the receiving cavity of the sagger body, the carbon content distribution on the inner surface of the sagger is adjusted, so that the lithium iron phosphate in the sagger is mixed more evenly with carbon during the sintering process. This results in a better compounding effect of lithium iron phosphate particles of different sizes, and avoids the different morphology and electrode configuration of the obtained lithium iron phosphate material, which would affect the physical properties of lithium iron phosphate. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of the structure of the sagger body in an embodiment of this utility model.
[0026] Figure 2 This is a schematic diagram of the structure of the lid plate of the sagger in an embodiment of this utility model.
[0027] Explanation of reference numerals in the attached figures:
[0028] The sagger body 100, side plate 110, groove 111, receiving cavity 120, partition 130, cover plate 200, protrusion 210, and vent hole 220. Detailed Implementation
[0029] The present invention will be further described below by way of embodiments, but the present invention is not limited to the scope of the embodiments.
[0030] like Figure 1-2As shown, this embodiment discloses a sintering sagger for lithium iron phosphate, including a sagger body 100. The sagger body 100 includes a bottom plate and a side plate 110 fixedly connected to the bottom plate. The bottom plate and the side plate 110 form a receiving cavity 120 for holding materials. The sintering sagger also includes a partition 130 and a cover plate 200. The partition 130 divides the receiving cavity 120 into at least two independent chambers. The top surface of the partition 130 is lower than the top surface of the side plate 110. The cover plate 200 covers the partition 130 and is located inside the receiving cavity 120. A first limiting structure is provided on the outer peripheral wall of the cover plate 200, and a second limiting structure matching the first limiting structure is provided on the inner wall of the side plate 110. By setting a partition 130 and a cover plate 200 in the receiving cavity 120 of the sagger body 100, the carbon content distribution on the inner surface of the sagger is adjusted, so that the lithium iron phosphate in the sagger is mixed more evenly with carbon during the sintering process. This results in a better compounding effect of lithium iron phosphate particles of different sizes, and avoids the different morphology and electrode configuration of the prepared lithium iron phosphate material, which would affect the physical properties of lithium iron phosphate.
[0031] There are multiple partitions 130, and the receiving cavity 120 of the sagger body 100 is divided into chambers with different numbers of compartments by the multiple partitions 130. The multiple partitions 130 can be arranged in various ways, such as perpendicularly intersecting, non-perpendicularly intersecting, circular, parallel, or non-parallel, to divide the receiving cavity 120 of the sagger body 100 into multiple compartments. For example, perpendicularly intersecting partitions 130 can divide the sagger into 2, 4, 6, or 8 compartments; parallel partitions 130 can divide the sagger into 2, 3, 4, 5, 6, 7, 8, or 9 compartments; diagonal partitions 130 can divide the sagger into 2 or 4 compartments, etc.
[0032] The partition 130 evenly divides the receiving cavity 120 into compartments of different chambers. The volume of each compartment is proportional to the volume of the receiving cavity 120 of the sagger body 100 in a ratio of 1:n, where n is less than or equal to 8. When the ratio of the volume of each compartment to the volume of the receiving cavity 120 of the sagger body 100 is 1:2, the partition 130 can be arranged along the diagonal of the receiving cavity 120, parallel to the side plate 110, or an annular structure. When the ratio of the volume of each compartment to the volume of the receiving cavity 120 of the sagger body 100 is 1:3 to 1:4, the partition 130 can be parallel to the side plate 110 or an annular structure.
[0033] In this embodiment, the partition 130 is integrally formed with the bottom plate and the side plate 110. The sagger body 100 can be a square structure, such as a square or rectangle, or it can be a pentagonal prism, hexagonal prism, cylinder, or other shapes. In other embodiments, the partition 130 and the bottom plate and side plate 110 can also be separate structures, assembled by splicing.
[0034] The sagger body 100 and the partition plate 130 are made of graphite, alumina or silicon carbide; the cover plate 200 is made of graphite, alumina or silicon carbide.
[0035] In this embodiment, the cover plate 200 is provided with multiple vent holes 220. The vent holes 220 can be circular, elliptical, or square. The opening angle of the vent holes 220 can be 30°-150°. By providing vent holes 220 on the cover plate 200, gas flow during the material sintering process can be maintained, preventing gas from accumulating in the receiving cavity 120 and affecting the quality of lithium iron phosphate particles.
[0036] In this embodiment, the first limiting structure is a protrusion 210, and the second limiting structure is a groove 111. The depth of the groove 111 recessed from the inner wall of the side plate 110 to the outer wall is less than the length of the protrusion 210, and the width of the groove 111 is greater than the width of the protrusion 210. The distance the groove 111 extends downward from the top surface of the side plate 110 is not greater than the distance between the top surface of the side plate 110 and the top surface of the partition 130. There is a gap between the cover plate 200 and the inner wall of the receiving cavity 120. The protrusion 210 and the groove 111 form a guiding structure, which can reduce the friction between the cover plate 200 and the sagger body 100. The protrusion 210 and the groove 111 can be triangular, circular, or other shapes that can match each other.
[0037] Specifically, in this embodiment, the side plate 110 and the bottom plate are 15mm thick, the partition plate 130 is 5mm thick, and the cover plate 200 is 10mm thick; the dimensions of the receiving cavity 120 are 300mm*300mm*165mm (length*width*height), the partition plate 130 is 115mm high, and the cover plate 200 is 295mm*295mm on each side. The groove 111 has a depth, width, and height of 5mm, 10mm, and 50mm, respectively, and the protrusion 210 has a length, width, and thickness of 6.5mm, 8mm, and 10mm, respectively.
[0038] In other embodiments, a groove 111 may be provided on the cover plate 200, and a protrusion 210 may be added to the inner wall of the side plate 110.
[0039] In this embodiment, the surface of the separator 130 and the lower surface of the cover plate 200 are wavy. Setting the surfaces of the separator 130 and the lower surface of the cover plate 200 to be wavy can increase the contact area between the lithium iron phosphate in the crucible and the separator 130 and the cover plate 200, further increasing the carbon content of the lithium iron phosphate material and making the compounding effect of lithium iron phosphate with different particle sizes better.
[0040] In some other embodiments, the partition 130 or the cover 200 may also be a planar structure, or a combination of planar and corrugated structures.
[0041] In some embodiments, the partition 130 is provided with through holes to increase the fluidity of lithium iron phosphate materials in different chambers during sintering and improve the compounding effect of lithium iron phosphate with different particle sizes.
[0042] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.
Claims
1. A sintering saggar for lithium iron phosphate, comprising a saggar body, the saggar body comprising a bottom plate and a side plate fixedly connected with the bottom plate, the bottom plate and the side plate constituting a containing cavity for containing materials, characterized in that, The sintering sagger also includes a partition and a cover plate. The partition divides the receiving cavity into at least two independent chambers. The top surface of the partition is lower than the top surface of the side plate. The cover plate covers the partition and is located inside the receiving cavity. The outer peripheral wall of the cover plate is provided with a first limiting structure, and the inner wall surface of the side plate is provided with a second limiting structure that matches the first limiting structure. The cover plate has multiple ventilation holes.
2. The sintering sagger for lithium iron phosphate as described in claim 1, characterized in that, There are multiple partitions.
3. The sintering sagger for lithium iron phosphate as described in claim 1, characterized in that, The partition is integrally formed with the bottom plate and the side plate.
4. The sintering sagger for lithium iron phosphate as described in claim 1, characterized in that, The sagger body and the partition are made of one of graphite, alumina or silicon carbide; And / or, the cover plate is made of one of graphite, alumina or silicon carbide.
5. The sintering sagger for lithium iron phosphate as described in claim 1, characterized in that, The first limiting structure is a protrusion, and the second limiting structure is a groove.
6. The sintering sagger for lithium iron phosphate as described in claim 5, characterized in that, The depth of the groove recessed from the inner wall of the side plate to the outer wall is less than the length of the protrusion, and the width of the groove is greater than the width of the protrusion. The groove extends downward from the top surface of the side plate by a distance not greater than the distance between the top surface of the side plate and the top surface of the partition. There is a gap between the cover plate and the inner wall of the receiving cavity.
7. The sintering sagger for lithium iron phosphate as described in claim 6, characterized in that, The side plate and the bottom plate are 15mm thick, the partition is 5mm thick, and the cover plate is 10mm thick. And / or, the length, width and height of the receiving cavity are 300mm*300mm*165mm, the height of the partition is 115mm, and the side length of the cover is 295mm*295mm; And / or, the depth, width, and height of the groove are 5mm, 10mm, and 50mm respectively, and the length, width, and thickness of the protrusion are 6.5mm, 8mm, and 10mm respectively.
8. The sintering sagger for lithium iron phosphate as described in claim 1, characterized in that, The surface of the partition is wavy; And / or, the lower surface of the cover plate is wavy.
9. The sintering sagger for lithium iron phosphate as described in claim 1, characterized in that, The partition plate has through holes.