Lithium / sodium ion battery positive electrode material sintering preparation device

Abstract

The utility model discloses a lithium / sodium ion battery positive electrode material sintering preparation device which comprises a feeding bin, a rotary kiln connected with the feeding bin and a discharging device located at the kiln tail of the rotary kiln. A stirrer for mixing and stirring materials of the lithium / sodium ion battery positive electrode materials is arranged in the feeding bin, a rodless air cylinder is further connected to the feeding bin through a supporting frame, and a cutting machine is connected to the rodless air cylinder so as to cut a material packaging bag located at the upper end of the feeding bin to achieve convenient feeding; the sintering preparation device further comprises a plurality of different air inlet channels, and the multiple different air inlet channels are connected to the kiln head of the rotary kiln through a pipeline after being converged. According to the sintering preparation device, the stirring sufficiency among various materials can be improved; and meanwhile, inert atmosphere and / or reaction gas can be selectively provided according to reaction in the rotary kiln, so that the versatility of the sintering preparation device is improved.

Description

Technical Field

[0001] This utility model belongs to the field of lithium / sodium ion battery cathode material preparation, and particularly relates to a sintering preparation device for lithium / sodium ion battery cathode materials. Background Technology

[0002] With technological advancements, lithium-ion batteries have become the most popular power batteries. Among them, lithium iron phosphate batteries are widely used in electric vehicles due to their advantages such as high energy density, long cycle life, and good safety performance. However, with the application and development of lithium-ion batteries, the scarcity of lithium resources has gradually become apparent. Sodium resources, on the other hand, are abundant and easy to mine, making sodium-ion batteries a promising option for rechargeable batteries.

[0003] The preparation processes of lithium-ion battery cathode materials mainly include: solid-state method, complexation method, dissolution-gel method, plasma exchange method, spray drying method, high-temperature solid-state synthesis method, carbothermal reduction method, and microwave drying technology. Among these, the high-temperature solid-state synthesis method is more suitable for industrialization. This method uses lithium carbonate, lithium hydroxide, etc. as lithium sources and ferrous oxalate, ferrous oxalate, iron oxide, iron phosphate, etc. as iron sources, and then sintersulates the mixture at high temperature.

[0004] There are two main processes for preparing sodium-ion battery cathode materials: The first is a solid-phase ball milling process, in which water-insoluble metal salts, sodium salts, phosphorus sources, vanadium sources (optional), and carbon sources (glucose, citric acid, sucrose, etc.) are mixed and ball-milled, followed by spray drying to obtain precursor powder, which is then calcined to obtain the final product. The second process is a liquid-phase process, in which water-soluble metal salts, sodium salts (sodium carbonate, sodium hydroxide, sodium oxalate, sodium phosphate, etc.), phosphorus sources (sodium pyrophosphate, ammonium dihydrogen phosphate, sodium phosphate, monohydrogen / dihydrogen phosphate, etc.), vanadium sources (optional), and carbon sources (glucose, citric acid, sucrose, etc.) are mixed and dissolved, followed by spray drying to obtain precursor powder, which is then calcined to obtain the final product.

[0005] Therefore, regardless of whether it is the preparation of lithium-ion battery cathode materials or sodium-ion battery cathode materials, sintering of the materials is required during the preparation process. However, in the actual preparation process, in order to obtain lithium / sodium-ion battery cathode materials with better performance, it is usually necessary to add materials of different types or particle sizes to prepare the cathode material together. However, existing rotary kilns feed multiple mixed materials into the rotary kiln through a feed hopper so that they can be stirred and mixed evenly during the rotary kiln sintering process. However, this simultaneous reaction and stirring in the rotary kiln will result in insufficient stirring between the materials, which will affect the sintering reaction and lead to unsatisfactory performance of the final cathode material.

[0006] Based on this, an apparatus for sintering and preparing cathode materials for lithium / sodium-ion batteries is provided to achieve thorough mixing and uniform sintering of the materials. Utility Model Content

[0007] Purpose of the utility model: The technical problem to be solved by this utility model is to provide a sintering preparation device for lithium / sodium ion battery cathode materials that can fully mix a variety of different materials and achieve uniform heating for sintering.

[0008] Technical solution: The present invention provides a lithium / sodium ion battery cathode material sintering preparation apparatus, comprising a material feeding hopper for lithium / sodium ion battery cathode materials, a rotary kiln connected to the feeding hopper, and a discharge device located at the kiln tail of the rotary kiln.

[0009] The feeding hopper is equipped with a stirrer for mixing and stirring materials for lithium / sodium-ion battery cathode materials. The feeding hopper is also connected to a rodless cylinder via a support frame. A cutting machine is connected to the rodless cylinder to cut the material packaging bag located at the top of the feeding hopper, thereby achieving convenient feeding.

[0010] The sintering preparation device also includes several different air inlet channels, which are connected to the kiln head of the rotary kiln via pipes after being merged.

[0011] Furthermore, the feed hopper of the sintering preparation device is connected to the rotary kiln via an elevator, and a conveyor belt is connected to the bottom of the feed hopper, with the discharge end of the conveyor belt connected to the elevator.

[0012] Furthermore, the rotary kiln of the sintering preparation apparatus is equipped with a spiral conveyor plate for conveying and stirring materials, and the kiln body of the rotary kiln is equipped with a PDC heating component to provide the heating sintering temperature.

[0013] Furthermore, a gear is connected to the outer wall of the rotary kiln of the sintering preparation device. This gear meshes with the motor gear to drive the rotary kiln to rotate via the motor.

[0014] Furthermore, the agitator of the sintering preparation apparatus includes a stirring shaft that is rotatably connected across the feed hopper and several stirring blades disposed on the stirring shaft.

[0015] Furthermore, the discharge device of the sintering preparation apparatus includes a discharge bin located at the discharge end of the rotary kiln, a transmission belt connected to the discharge bin, and an elevator connected to the discharge end of the transmission belt, with a discharge pipe extending from the top of the elevator.

[0016] Furthermore, the sintering preparation device also includes several sets of rotary kiln support pulleys.

[0017] Furthermore, the rotary kiln of the sintering preparation device is also equipped with several sets of circulating water jackets to appropriately cool the rotary kiln and prevent the sintering reaction temperature from being too high.

[0018] Beneficial effects: Compared with the prior art, the advantages of this utility model are as follows: This sintering preparation device can cut and feed bagged materials conveniently by setting a cutting machine driven by a rodless cylinder on the feeding hopper and setting an agitator in the hopper. This improves the convenience of feeding operation. It can also pre-stir materials of different types, models and particle sizes before they enter the rotary kiln for stirring and reaction, which improves the thoroughness of stirring between materials. At the same time, by setting several air inlet pipes at the kiln head of the rotary kiln, it can selectively provide inert atmosphere and / or reaction gas according to the reaction in the rotary kiln, which improves the versatility of the sintering preparation device. In addition, with the help of the spiral conveyor plate set in the rotary kiln, the product obtained after the reaction can be effectively output without tilting the rotary kiln. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the feeding hopper of this utility model;

[0020] Figure 2 This is a perspective view of the sintering preparation apparatus of this utility model;

[0021] Figure 3 This is a perspective view of the rotary kiln of the sintering preparation device of this utility model. Detailed Implementation

[0022] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings.

[0023] The sintering preparation apparatus of this invention is used for calcining lithium-ion battery cathode materials or sodium-ion battery cathode materials before they are finished products, or for performing carbon-coated vapor deposition reactions simultaneously with calcination. Specifically, the sintering preparation apparatus is as follows: Figure 1As shown, the device includes a feeding hopper 1, which can simultaneously feed multiple materials of different types or particle sizes, such as different types of lithium / sodium-ion battery cathode material precursors, to obtain cathode materials with optimal performance. A rodless cylinder 5 is connected to the feeding end of the feeding hopper 1 via a support frame 4. A cutter 6 is connected to the rodless cylinder 5, and by sliding left and right, the cutter 6 can cut open the packaging bags of the bagged materials for convenient feeding. The bagged materials can be transported to the top of the feeding hopper using other transport equipment. The feeding hopper 1 contains a stirrer 3, consisting of a rotating shaft 11 rotatably mounted on the hopper body and several stirring blades 12 arranged on the stirring shaft 11. Through the pre-stirring action of the stirrer 3, materials of different types or particle sizes can be mixed evenly.

[0024] like Figure 2 As shown, the discharge port of the feed hopper 1 is connected to the transmission belt 9, and the discharge port of the transmission belt 9 is connected to the elevator 8. The discharge port of the elevator 8 is sealed to the rotary kiln 2. That is, the discharge end of the elevator 8 is equipped with a feed baffle and a motor that drives the feed baffle to rotate. When feeding, the feed baffle opens to realize feeding, and after feeding, the feed baffle closes to realize the sealed connection between the elevator 8 and the feed port of the rotary kiln 2. This technology is known in the art, and therefore will not be described in detail in this utility model. The discharge end of the elevator 8 is located at the kiln head of the rotary kiln 2. Similarly, the kiln head of the rotary kiln 2 is also connected to several different air inlet channels 7. Each air inlet channel 7 is equipped with a corresponding valve. Preferably, there are two sets of air inlet channels 7, which respectively introduce reaction gas and inert gas, or only inert gas for calcination reaction. Several different air inlet channels 7 converge and are connected to the kiln head of the rotary kiln 2 through a pipeline. The existing rotary kiln 2 is inclined at a 1° angle, while the rotary kiln 2 of this invention is directly horizontally set and can still effectively output the positive electrode material obtained after the reaction. This effect is achieved because the rotary kiln 2 is equipped with a spiral conveyor plate 10 inside the kiln body, such as... Figure 3 As shown in the figure. The rotary kiln 2 itself can rotate; that is, a gear is connected to the outer wall of the rotary kiln 2, which meshes with the motor gear to drive the rotary kiln 2 to rotate (not shown in the figure). Through the spiral conveyor plate 10 and the rotation of the rotary kiln 2, the premixed material can be re-stirred and mixed, and continuously conveyed to the kiln tail of the rotary kiln 2. The kiln tail of the rotary kiln 2 is equipped with a discharge device, which includes a discharge bin located at the discharge end of the rotary kiln 2, a transmission belt connected to the discharge bin, and an elevator 8 connected to the discharge end of the transmission belt. The top of the elevator 8 extends into a discharge pipe 13 to collect the finally prepared positive electrode material.

[0025] In addition to the aforementioned components, the rotary kiln 2 of this invention is equipped with a PDC heating assembly on its kiln body to provide the sintering temperature. Several sets of circulating water jackets are also provided on the outer wall of the rotary kiln 2 to appropriately cool the kiln and prevent the sintering reaction temperature from becoming too high. This technology is well-known in the art and will not be described in detail here. The kiln tail of this invention is connected to a tail gas treatment device (not shown in the accompanying drawings). This can be any tail gas treatment device known in the art, and this invention does not specifically limit its application.

[0026] Based on the sintering preparation apparatus of this invention, the materials are thoroughly mixed and reacted through pre-stirring in the feed hopper 1 combined with rotational stirring during the calcination process, thereby improving the product yield. Furthermore, by setting different air inlet pipes 7, the application range and versatility of this sintering preparation apparatus are expanded.

Claims

1. A lithium / sodium ion battery cathode material sintering preparation device, characterized in that, The sintering preparation device comprises a material feeding bin (1) of lithium / sodium ion battery positive electrode material, a rotary kiln (2) connected with the feeding bin (1), and a discharging device at the kiln tail of the rotary kiln (2). The feeding bin (1) is provided with a stirrer (3) for mixing and stirring the material of lithium / sodium ion battery positive electrode material, and a rodless air cylinder (5) is connected to the feeding bin (1) through a support frame (4), and a cutting machine (6) is connected to the rodless air cylinder (5) to cut the material packaging bag at the upper end of the feeding bin (1) and realize convenient feeding. The sintering preparation device further comprises a plurality of different gas inlet channels (7) connected to the kiln head of the rotary kiln (2) through a pipeline after being merged.

2. The lithium / sodium-ion battery cathode material sintering preparation device according to claim 1, characterized in that, The feeding bin (1) is connected with the rotary kiln (2) through an elevator (8), and a conveyor belt (9) is connected to the bottom end of the feeding bin (1), and the discharge end of the conveyor belt (9) is connected with the elevator (8).

3. The lithium / sodium-ion battery cathode material sintering preparation device according to claim 1, characterized in that, The rotary kiln (2) is provided with a spiral conveying plate (10) for conveying and stirring the material, and a PDC heating assembly is arranged on the kiln body of the rotary kiln (2) to provide sintering temperature.

4. The lithium / sodium-ion battery cathode material sintering preparation device according to claim 1, characterized in that, A gear is connected to the outer wall of the rotary kiln (2), which is engaged with the gear of a motor to drive the rotary kiln (2) to rotate by the motor.

5. The lithium / sodium-ion battery cathode material sintering preparation device according to claim 1, characterized in that, The stirrer (3) comprises a stirring shaft (11) transversely connected in the feeding bin (1) and a plurality of stirring blades (12) arranged on the stirring shaft (11).

6. The lithium / sodium-ion battery cathode material sintering preparation device according to claim 1, characterized in that, The discharging device comprises a discharging bin at the discharging end of the rotary kiln (2), a transmission belt connected with the discharging bin, and an elevator (8) connected with the discharging end of the transmission belt, and the top end of the elevator (8) is provided with a discharging pipe (13).

7. The lithium / sodium-ion battery cathode material sintering preparation device according to claim 1, characterized in that, The sintering preparation device further comprises a plurality of groups of rotary kiln supporting pulleys (14).

8. The lithium / sodium-ion battery cathode material sintering preparation device according to claim 1, characterized in that, The kiln body of the rotary kiln (2) is further provided with a plurality of groups of circulating water jackets to appropriately cool the rotary kiln (2) to avoid excessive sintering reaction temperature.

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