A preparation device and method for high-performance ternary positive electrode material

Abstract

The present invention discloses a device and method for preparing a high-performance ternary positive electrode material, the device comprises a first passive drainage type spiral mixing mechanism, the vacuum end of the vacuum mixing mechanism is connected to the outlet end of the first passive drainage type spiral mixing mechanism, the outlet end of the vacuum mixing mechanism is connected to the inlet end of the multi-disc drying mechanism, the outlet end of the multi-disc drying mechanism is connected to the inlet end of the intermediate tank, the inlet end of the second passive drainage type spiral mixing mechanism is connected to the outlet end of the intermediate tank, and the outlet end of the second passive drainage type spiral mixing mechanism is connected to the inlet end of the material tank; the method uses the above device to prepare high-performance ternary positive electrode materials. The present invention can effectively reduce the degree of lattice change, avoid the problem of cracking of grain boundaries, improve the performance of the battery, extend the service life of the battery, and prevent safety hazards. The present invention is applicable to the technical field of battery positive electrode material preparation.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery positive electrode material preparation, and in particular, relates to a preparation device and method for a high-performance ternary positive electrode material. Background Art

[0002] At present, ternary materials are widely used in the field of batteries. They have the advantages of fast charging, light weight, and many cycles of charge and discharge. In the process of charging and discharging batteries with ternary materials as positive electrodes, since the ternary positive electrode materials are nanometer-level, the amount of grain boundaries in them is extremely large. Due to the heat generated by charging and discharging and the anisotropy of the lattice, the lattice changes, and as the number of charge and discharge times and power increase, the grain boundaries crack, which eventually causes the battery performance to decay rapidly, shortening the battery life, and bringing safety hazards to later use. Therefore, there is an urgent need for a ternary positive electrode material to reduce the degree of lattice change, avoid the problem of grain boundary cracking, improve battery performance, extend the battery life, and prevent safety hazards. Summary of the invention

[0003] The present invention provides a high-performance ternary positive electrode material and a preparation method thereof, which are used to reduce the degree of lattice change, avoid the problem of cracking of grain boundaries, improve battery performance, extend the service life of the battery, and prevent potential safety hazards.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A preparation device for high-performance ternary positive electrode materials comprises a first passive drainage type spiral mixing mechanism, a vacuuming end of a vacuum mixing mechanism is connected to an outlet end of the first passive drainage type spiral mixing mechanism, the outlet end of the vacuum mixing mechanism is connected to an inlet end of a multi-disc drying mechanism, the outlet end of the multi-disc drying mechanism is connected to an inlet end of an intermediate tank, the inlet end of a second passive drainage type spiral mixing mechanism is connected to an outlet end of the intermediate tank, and the outlet end of the second passive drainage type spiral mixing mechanism is connected to an inlet end of a material tank.

[0006] Furthermore, the first passive drainage type spiral mixing mechanism includes a vertical mixing cylinder with a fixed cover fixed on the upper end, a first feed pipe is constructed at the center of the fixed cover, a first control valve is installed on the first feed pipe, a plurality of second feed pipes are evenly installed on the fixed cover along the circumference of the first feed pipe, a second control valve is installed on the second feed pipe, the first feed pipe and the second feed pipe are both connected to the mixing channel of the vertical mixing cylinder, and the lower end of the vertical mixing cylinder is connected to the vacuum end of the vacuum type mixing mechanism.

[0007] Furthermore, a plurality of spiral material guiding blades are constructed in the vertical mixing barrel. The spiral material guiding blades are evenly arranged along the circumference of the vertical mixing barrel, and each spiral material guiding blade extends spirally along the axis of the vertical mixing barrel.

[0008] Furthermore, a plurality of spiral material guide strips are evenly constructed on the vertical mixing barrel along its circumference, each of the spiral material guide strips extends spirally along the axis of the vertical mixing barrel, and each spiral material guide blade is formed on a side of the corresponding spiral material guide strip extending into the vertical mixing barrel, and a spiral material guide cavity and a spiral material discharge cavity that are interconnected are respectively formed in the spiral material guide strips and the spiral material guide blades, the upper end of the spiral material guide cavity is connected to the corresponding second feed pipe, and the side of the spiral material discharge cavity away from the spiral material guide strip is connected to the mixing channel, and the lower ends of the spiral material guide cavity and the spiral material discharge cavity are in a closed state.

[0009] Furthermore, the vacuum mixing mechanism includes a coaxially arranged mounting tube, a liquid inlet pipe and a liquid outlet pipe, the vacuum end is formed on the mounting tube, a nozzle is constructed at one end of the liquid inlet pipe extending into the mounting tube, the liquid outlet pipe is connected to the outlet of the mounting tube through a transition pipe, a negative pressure zone is formed in the area between the nozzle and the mounting tube, a primary mixing zone and a secondary mixing zone are respectively formed in the transition pipe and the liquid outlet pipe, and the outlet end of the liquid outlet pipe is connected to the inlet end of the multi-disc drying mechanism.

[0010] Furthermore, a plurality of spiral mixing blades are constructed in the liquid outlet pipe. The spiral mixing blades are evenly arranged along the circumference of the liquid outlet pipe, and each spiral mixing blade extends spirally along the axis of the liquid outlet pipe.

[0011] Furthermore, the multi-disc drying mechanism includes a horizontal drying kettle with a gradually expanding diameter and a drying chamber formed inside, a sealing cover is detachably connected to the end of the large diameter end of the horizontal drying kettle, a discharge pipe and an exhaust pipe are respectively constructed at the lower and upper parts of the peripheral wall of the large diameter end of the horizontal drying kettle, the discharge pipe and the exhaust pipe are both connected to the discharge chamber of the drying chamber, a drying disc group is coaxially rotatably connected in the horizontal drying kettle, one end of the drying disc group is connected to the outlet end of the vacuum mixing mechanism, and the other end of the drying disc group extends out of the sealing cover, an insulating cylinder is provided outside the horizontal drying kettle, an assembly chamber is formed between the insulating cylinder and the horizontal drying kettle, an electric heating wire is installed in the assembly chamber, and the electric heating wire is spirally wound around the outside of the horizontal drying kettle.

[0012] Further, the drying disc group includes a plurality of drying disc bodies coaxially installed on the mounting shaft at intervals along the axis of the mounting shaft, a liquid guide channel is constructed in the mounting shaft, a transfer joint is constructed at the center of the small-diameter end of the horizontal drying kettle, the end of the mounting shaft is rotatably connected to the transfer joint, and the liquid guide channel is communicated with the outlet end of the vacuum mixing mechanism through the transfer joint, a first liquid distribution cavity is constructed in each drying disc body, a plurality of first liquid distribution holes are evenly opened on the drying disc body, each of the first liquid distribution holes is communicated with the liquid guide channel through the first liquid distribution cavity, a plurality of scraper plates extending radially thereof are constructed on the inner wall of the horizontal drying kettle, the side wall of each scraper plate is close to or in contact with the side wall of the corresponding drying disc body, a transmission wheel is coaxially installed at one end of the mounting shaft extending out of the sealing cover, and a material passing channel is formed in the drying cavity and between the lower part of the peripheral wall of each drying disc body and the lower part of the horizontal drying kettle.

[0013] Furthermore, a connecting plate is coaxially constructed on a portion of the mounting shaft close to the discharge chamber, a second liquid distribution chamber is constructed in the connecting plate, a plurality of second liquid distribution holes are evenly opened on one end of the connecting plate close to the drying plate body, each of the second liquid distribution holes is connected to the liquid guiding channel through the second liquid distribution chamber, an end surface of the connecting plate close to the discharge chamber is in a closed state, a grinding ring is coaxially fixed on the outer peripheral wall of the connecting plate, and a grinding channel is formed in the drying chamber and between the lower portion of the outer peripheral wall of the connecting plate and the lower portion of the horizontal drying kettle.

[0014] The present invention also discloses a method for preparing a device using the high-performance ternary cathode material, comprising the following steps:

[0015] Step 1. Continuously and synchronously supply the following components with a particle size range of 120-200 nm to the first passive drainage type spiral mixing mechanism according to the mass fraction ratio.

[0016] Nickel sulfate 2.4-2.8 parts

[0017] Nickel nitrate 1.5-1.9 parts

[0018] Cobalt sulfate 3.7-4.1 parts

[0019] Manganese sulfate 1.6-1.8 parts

[0020] Manganese nitrate 0.9-1.2 parts

[0021] Step 2. Pumping the sodium hydroxide solution into the vacuum mixing mechanism from the inlet port. When the sodium hydroxide solution passes through the vacuum mixing mechanism, the vacuum end of the vacuum mixing mechanism draws the material in the first passive drainage type spiral mixing mechanism into the vacuum mixing mechanism;

[0022] Step 3. After the materials entering the vacuum mixing mechanism are mixed with the sodium hydroxide solution and the reaction is completed, they enter the multi-disc drying mechanism;

[0023] Step 4. Control the operation of the multi-disc drying mechanism. After the reaction solution is dried by the multi-disc drying mechanism, a powder material with a particle size of 90-160 nm is obtained and collected in an intermediate tank;

[0024] Step 5. Add the powder material in the intermediate tank into the second passive drainage type spiral mixing mechanism, and at the same time add 0.08-0.21 parts of a binder, 0.07-0.15 parts of a conductive agent, and 4.2-6.4 parts of lithium iron phosphate with a particle size of 4-5 μm into the second passive drainage type spiral mixing mechanism; then evacuate the second passive drainage type spiral mixing mechanism, and the materials are mixed in the second passive drainage type spiral mixing mechanism under negative pressure and enter the material tank;

[0025] Step 6. The mixed material in the material tank is injected into the material placing sagger, and the material placing sagger is transported into the sintering chamber one by one through the conveying mechanism;

[0026] Step 7. Pour the sintered material out of the sagger, crush and finely screen it, and then collect and pack the obtained powder.

[0027] Due to the adoption of the above structure, the technical progress achieved by the present invention compared with the prior art is that: the present invention dissolves and reacts different components of nanometer particle size, and then obtains nanometer-level primary materials by drying, and then fully mixes micrometer-level secondary materials and other intermediate materials (binders and conductive agents, etc.), and then performs sintering operations, so that the primary materials and secondary materials react under the action of the intermediate materials, and finally form the required ternary positive electrode material. The ternary positive electrode material prepared by the present invention has two components with different particle size spans, and under the action of the intermediate materials, the two components with larger particle size spans have extremely strong stability after reaction; during the charging and discharging process, the anisotropic movement trend of the lattice is absorbed by the nearby large particle size components, thereby effectively avoiding the cracking of the grain boundary and delaying the attenuation of battery performance. Moreover, the present invention uses the entire preparation system to prepare the high-performance ternary positive electrode material, which not only improves the preparation efficiency, but also has extremely high precision of the prepared product and reduces the intensity of the operation. In summary, the present invention can effectively reduce the degree of lattice change, avoid the problem of cracking of grain boundaries, improve the performance of the battery, extend the service life of the battery, and prevent potential safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0029] In the attached picture:

[0030] Figure 1 A schematic diagram of the structure of a preparation system according to an embodiment of the present invention;

[0031] Figure 2 This is a schematic structural diagram of a first passive drainage type spiral mixing mechanism according to an embodiment of the present invention;

[0032] Figure 3 It is an axial structural cross-sectional view of the first passive drainage type spiral mixing mechanism according to an embodiment of the present invention;

[0033] Figure 4 for Figure 3 A magnified view of the structure of the middle A part;

[0034] Figure 5 This is a schematic structural diagram of a vacuum mixing mechanism according to an embodiment of the present invention;

[0035] Figure 6 It is an axial structural cross-sectional view of the vacuum mixing mechanism according to an embodiment of the present invention;

[0036] Figure 7 This is a schematic structural diagram of a multi-disc drying mechanism according to an embodiment of the present invention;

[0037] Figure 8 It is an axial structural cross-sectional view of a multi-disc drying mechanism according to an embodiment of the present invention;

[0038] Fig. 9 for Figure 8 A magnified view of the structure of the middle B area;

[0039] Fig.10 for Figure 8 A magnified view of the structure of the middle C part;

[0040] Fig.11 It is a schematic structural diagram of the horizontal drying kettle and the sealing cover after being separated in the multi-disc drying mechanism of the embodiment of the present invention;

[0041] Fig.12 It is a schematic structural diagram of a drying disc group in a multi-disc drying mechanism according to an embodiment of the present invention;

[0042] Fig.13 It is a partial structural cross-sectional view of the connection between a single drying disk body and a mounting shaft in a drying disk assembly according to an embodiment of the present invention;

[0043] Fig.14 It is a partial structural cross-sectional view of the connection between the connecting disc, the grinding ring and the mounting shaft in the drying disc assembly of the embodiment of the present invention.

[0044] Labeled parts: 100-first passive drainage spiral mixing mechanism, 101-vertical mixing barrel, 102-mixing channel, 103-spiral guide strip, 104-spiral guide chamber, 105-spiral guide blade, 106-spiral discharge chamber, 107-fixed cover, 108-first feed pipe, 109-first control valve, 110-second feed pipe, 111-second control valve, 200-vacuum mixing mechanism, 201-installation pipe, 202-transition pipe, 203-liquid outlet pipe, 204-vacuum end, 205-liquid inlet pipe, 206-nozzle, 207-negative pressure zone, 208-primary mixing zone, 209-secondary mixing zone, 210-spiral mixing blade, 300-multi-disc Type drying mechanism, 301-horizontal drying kettle, 302-drying chamber, 303-discharge chamber, 304-discharge pipe, 305-exhaust pipe, 306-insulation cylinder, 307-electric heating wire, 308-scraper plate, 309-adapter joint, 310-installation shaft, 311-drying plate, 312-connecting plate, 313-grinding ring, 314-liquid guide channel, 315-first liquid distribution chamber, 316-second liquid distribution chamber, 317-feeding channel, 318-grinding channel, 319-sealing cover, 320-transmission wheel, 400-intermediate tank, 500-feeding pipe, 600-second passive drainage type spiral mixing mechanism, 700-material tank, 800-conveying mechanism, 900-sintering chamber. DETAILED DESCRIPTION

[0045] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0046] The present invention discloses a method for preparing a high-performance ternary cathode material. Figure 1-14 As shown, the following steps are included:

[0047] Step 1. Continuously and synchronously supply the following components with a particle size range of 120-200 nm to the first passive drainage type spiral mixing mechanism 100 according to the mass fraction ratio.

[0048] Nickel sulfate 2.4-2.8 parts

[0049] Nickel nitrate 1.5-1.9 parts

[0050] Cobalt sulfate 3.7-4.1 parts

[0051] Manganese sulfate 1.6-1.8 parts

[0052] Manganese nitrate 0.9-1.2 parts

[0053] Step 2. Pumping the sodium hydroxide solution into the vacuum mixing mechanism 200 from the inlet. When the sodium hydroxide solution passes through the vacuum mixing mechanism 200, the vacuum end 204 of the vacuum mixing mechanism 200 draws the material in the first passive drainage type spiral mixing mechanism 100 into the vacuum mixing mechanism 200;

[0054] Step 3. After the materials entering the vacuum mixing mechanism 200 are mixed with the sodium hydroxide solution and reacted, they enter the multi-disc drying mechanism 300;

[0055] Step 4. Control the operation of the multi-disc drying mechanism 300. After the reaction solution is dried by the multi-disc drying mechanism 300, a powder material with a particle size of 90-160 nm is obtained and collected in the intermediate tank 400;

[0056] Step 5. Add the powder material in the intermediate tank 400 into the second passive drainage type spiral mixing mechanism 600 through the feeding pipe 500, and at the same time add 0.08-0.21 parts of a binder, 0.07-0.15 parts of a conductive agent and 4.2-6.4 parts of lithium iron phosphate with a particle size of 4-5 μm into the second passive drainage type spiral mixing mechanism 600; then evacuate the second passive drainage type spiral mixing mechanism 600, and the materials are mixed in the second passive drainage type spiral mixing mechanism 600 under negative pressure and enter the material tank 700;

[0057] Step 6. The mixed material in the material tank 700 is injected into the material placing sagger, and the material placing sagger is transported into the sintering chamber 900 one by one through the conveying mechanism 800;

[0058] Step 7. Pour the sintered material out of the sagger, crush and finely screen it, and then collect and pack the obtained powder.

[0059] The working principle and advantages of the present invention are: the present invention dissolves and reacts different components of nanometer particle size, and then obtains a nanometer-level primary material by drying, and then fully mixes the micrometer-level secondary material and the remaining intermediate materials (binders and conductive agents, etc.), and then performs a sintering operation, so that the primary material and the secondary material react under the action of the intermediate material, and finally form the required ternary positive electrode material. The ternary positive electrode material prepared by the present invention has two components with different particle size spans, and under the action of the intermediate material, the two components with larger particle size spans have extremely strong stability after reaction; during the charging and discharging process, the anisotropic movement trend of the lattice is absorbed by the nearby large particle size components, thereby effectively avoiding the cracking of the grain boundary and delaying the battery performance attenuation. Moreover, the present invention uses the entire preparation system to prepare the high-performance ternary positive electrode material, which not only improves the preparation efficiency, but also has extremely high precision of the prepared product and reduces the intensity of the operation. In summary, the present invention can effectively reduce the degree of lattice change, avoid the problem of cracking of the grain boundary, improve the performance of the battery, extend the service life of the battery, and prevent the occurrence of safety hazards.

[0060] As a preferred embodiment of the present invention, Figure 2 , 3As shown, the structures of the first passive drainage type spiral mixing mechanism 100 and the second passive drainage type spiral mixing mechanism 600 are the same. Taking the first passive drainage type spiral mixing mechanism 100 as an example, it includes a vertical mixing barrel 101 and a fixed cover 107, wherein the fixed cover 107 is fixedly installed at the upper end of the vertical mixing barrel 101, a first feed pipe 108 is constructed at the center of the fixed cover 107, and a first control valve 109 is installed on the first feed pipe 108; a plurality of second feed pipes 110 are installed on the fixed cover 107, and these second feed pipes 110 are evenly arranged along the circumference of the first feed pipe 108, and a second control valve 111 is installed on each second feed pipe 110. The inner cavity of the vertical mixing barrel 101 of the present embodiment forms a mixing channel 102, and the first feed pipe 108 and the second feed pipe 110 are both connected to the mixing channel 102 of the vertical mixing barrel 101, and the lower end of the vertical mixing barrel 101 is connected to the vacuum end 204 of the vacuum mixing mechanism 200. The working principle and advantages of the present embodiment are: the present embodiment sucks the mixing channel 102 through the vacuum mixing mechanism 200, so that the mixing channel 102 generates a negative pressure. Under the action of the negative pressure, different materials enter the mixing channel 102 through the first feed pipe 108 and the second feed pipe 110 respectively, and these materials enter the vacuum mixing mechanism 200 after mixing in the mixing channel 102, and then mix, dissolve, and react with the sodium hydroxide solution. In the present embodiment, since the vacuum mixing mechanism 200 is in a continuous operation state, the mixing of materials in the vertical mixing barrel 101 is maintained in a continuous state, and the proportion of the solution is also in a continuous state, so as to achieve the purpose of ready-to-use, avoid waste, and greatly improve production efficiency.

[0061] As a preferred embodiment of the present invention, Figure 3 , 4 As shown, a plurality of spiral material guide blades 105 are constructed in the vertical mixing barrel 101, and the spiral material guide blades 105 are evenly arranged along the circumference of the vertical mixing barrel 101, and each spiral material guide blade 105 spirally extends along the axis of the vertical mixing barrel 101. The working principle and advantage of this embodiment are: when different materials enter the mixing channel 102 from the top of the vertical mixing barrel 101 under the action of negative pressure, then, under the action of the spiral material guide blades 105, the different materials synchronously spiral downward through the mixing channel 102, and in the process of passing through the mixing channel 102, the spiral materials are mutually blended and mixed to achieve the purpose of full mixing.

[0062] As a preferred embodiment of the present invention, Figure 3 , 4As shown, a plurality of spiral material guide strips 103 are uniformly configured along the circumference of the vertical mixing barrel 101, each spiral material guide strip 103 extends spirally along the axis of the vertical mixing barrel 101, and each spiral material guide blade 105 is formed on the side of the corresponding spiral material guide strip 103 extending into the vertical mixing barrel 101. In this embodiment, a spiral material guide cavity 104 is formed in the spiral material guide strip 103, a spiral material discharge cavity 106 is formed in the spiral material guide blade 105, and the spiral material guide cavity 104 and the spiral material discharge cavity 106 are connected to each other. In this embodiment, the upper end of the spiral material guide cavity 104 is connected to the corresponding second feed pipe 110, and the side of the spiral material discharge cavity 106 away from the spiral material guide strip 103 is connected to the mixing channel 102, and the lower ends of the spiral material guide cavity 104 and the spiral material discharge cavity 106 are in a closed state. The working principle and advantages of this embodiment are as follows: one material of this embodiment enters the mixing channel 102 from the first feed pipe 108, and the other materials enter the corresponding second feed pipes 110 respectively, and then enter the mixing channel 102 after passing through the spiral guide cavity 104 and the spiral discharge cavity 106, and then the spirals intersect and are fully mixed in the mixing channel 102. Moreover, since the materials enter the mixing channel 102 from the spiral discharge cavity 106 from top to bottom, the feeding of the materials is not limited to the top of the mixing channel 102, and the mixing of the materials is carried out simultaneously at various positions of the mixing channel 102, which greatly improves the efficiency and adequacy of the mixing.

[0063] As a preferred embodiment of the present invention, Figure 5 , 6As shown, the vacuum type mixing mechanism 200 includes a coaxially arranged mounting tube 201, a liquid inlet tube 205 and a liquid outlet tube 203, the above-mentioned vacuum end 204 is formed on the mounting tube 201, and the vacuum end 204 is communicated with the lower end of the vertical mixing cylinder 101, a nozzle 206 is configured at one end of the liquid inlet tube 205 extending into the mounting tube 201, and the liquid outlet tube 203 is connected to the outlet of the mounting tube 201 through a transition tube 202. In this embodiment, a negative pressure area 207 is formed in the area between the nozzle 206 and the mounting tube 201, a primary mixing area 208 is formed in the transition tube 202, a secondary mixing area 209 is formed in the liquid outlet tube 203, and the outlet end of the liquid outlet tube 203 is communicated with the inlet end of the multi-disc drying mechanism 300. The vacuum mixing mechanism 200 of this embodiment is based on the same principle as a vacuum pump. The sodium hydroxide solution is introduced into the liquid inlet pipe 205 and discharged from the nozzle 206, so that the negative pressure zone 207 forms a negative pressure, and then the mixed material in the vertical mixing cylinder 101 enters the primary mixing zone 208 through the negative pressure zone 207; thereafter, the mixed material is primarily dissolved in the sodium hydroxide solution at the primary mixing zone 208, and enters the secondary mixing zone 209 with the flow of the liquid, and finally completely dissolved. In order to improve the efficiency of dissolution, the measures taken in this embodiment are that a plurality of spiral mixing blades 210 are constructed in the liquid outlet pipe 203, and these spiral mixing blades 210 are evenly arranged along the circumference of the liquid outlet pipe 203, and each spiral mixing blade 210 extends spirally along the axis of the liquid outlet pipe 203. After the liquid enters the secondary mixing zone 209, under the action of the spiral mixing blades 210, the liquid passes through the secondary mixing zone 209 in the form of a vortex, so that the material is fully and quickly dissolved in the sodium hydroxide solution and reacts completely.

[0064] As a preferred embodiment of the present invention, Figure 7-14As shown, the multi-disc drying mechanism 300 includes a horizontal drying kettle 301, a sealing cover 319, a drying disc group, an insulating cylinder 306 and an electric heating wire 307. The caliber of the horizontal drying kettle 301 gradually expands from one axial end toward the other axial end, and a drying chamber 302 is formed at the lower part of the peripheral wall of the large diameter end of the horizontal drying kettle 301 in the horizontal drying kettle 301. The sealing cover 319 is detachably connected to the end position of the large diameter end of the horizontal drying kettle 301. A discharge pipe 304 is constructed at the lower part of the peripheral wall of the large diameter end of the horizontal drying kettle 301, and an exhaust pipe 305 is constructed at the upper part of the peripheral wall of the large diameter end of the horizontal drying kettle 301. The discharge pipe 304 and the exhaust pipe 305 are both connected to the discharge chamber 303 of the drying chamber 302. The drying disc group of this embodiment is coaxially arranged with the horizontal drying kettle 301, and the drying disc group is arranged in the horizontal drying kettle 301 and is rotatably connected with the horizontal drying kettle 301; one end of the drying disc group is connected with the outlet end of the vacuum mixing mechanism 200, and the other end of the drying disc group extends out of the sealing cover 319. The heat-insulating cylinder 306 of this embodiment is set outside the horizontal drying kettle 301, and an assembly cavity is formed between the heat-insulating cylinder 306 and the horizontal drying kettle 301. The electric heating wire 307 is installed in the assembly cavity, and the electric heating wire 307 is spirally wound outside the horizontal drying kettle 301. The working principle and advantage of this embodiment are: the solution equipped in this embodiment is transported to the drying disc group, and then it is dried and dehydrated on the surface of the drying disc group and attached to the surface of the drying disc group. At the same time, the drying disc group is driven to rotate, so that the dry material thereon is separated and gradually enters the discharge pipe 304 for discharge, and the water vapor generated by drying is discharged through the exhaust pipe 305. The specific structure of the drying disc group of this embodiment is that the drying disc group includes a mounting shaft 310, a transmission wheel 320 and a plurality of drying disc bodies 311, and the axes of the mounting shaft 310, the transmission wheel 320 and the plurality of drying disc bodies 311 coincide with each other, and the drying disc bodies 311 are installed on the mounting shaft 310 at intervals along the axis of the mounting shaft 310. A liquid guide channel 314 is constructed in the mounting shaft 310, and a switching joint 309 is constructed at the center of the small diameter end of the horizontal drying kettle 301. One end of the mounting shaft 310 is rotatably connected to the switching joint 309, and the liquid guide channel 314 is connected to the outlet end (the outlet end of the liquid outlet pipe 203) of the vacuum mixing mechanism 200 through the switching joint 309; a first liquid distribution cavity 315 is constructed in each drying disc body 311, and a plurality of first liquid distribution holes are evenly opened on the drying disc body 311, and each first liquid distribution hole is connected to the liquid guide channel 314 through the first liquid distribution cavity 315.In this embodiment, a plurality of scraper plates 308 extending radially are constructed on the inner wall of the horizontal drying kettle 301, and the side wall of each scraper plate 308 is close to or in contact with the side wall of the corresponding drying disc 311. The transmission wheel 320 is installed at one end of the mounting shaft 310 extending out of the sealing cover 319, and a material passing channel 317 is formed in the drying chamber 302 and between the lower part of the outer peripheral wall of each drying disc 311 and the lower part of the horizontal drying kettle 301. In this embodiment, by driving the transmission wheel 320 to rotate, the mounting shaft 310 drives each drying disc 311 to rotate, and the reaction solution enters each first liquid distribution hole through each first liquid distribution cavity 315 from the liquid guide channel 314, and then is discharged from the first liquid distribution hole, and then is quickly dried and evaporated, and the obtained solid material condenses on the surface of each drying disc 311; and during the rotation of the drying disc 311, the solid material is scraped off by the scraper plate 308. In this embodiment, since multiple drying discs 311 are used to perform drying operations synchronously, the drying efficiency is improved. In this embodiment, a connecting plate 312 is coaxially constructed at the part of the mounting shaft 310 close to the discharge chamber 303, and a second liquid distribution chamber 316 is constructed in the connecting plate 312. A plurality of second liquid distribution holes are evenly opened at one end of the connecting plate 312 close to the drying plate body 311, and each second liquid distribution hole is connected to the liquid guide channel 314 through the second liquid distribution chamber 316. The second liquid distribution chamber 316 has the same function as the first liquid distribution chamber 315, and the second liquid distribution holes have the same function as the first liquid distribution holes. In this embodiment, the end surface of the connecting plate 312 close to the discharge chamber 303 is in a closed state, and a grinding ring 313 is coaxially fixed on the outer peripheral wall of the connecting plate 312. A grinding channel 318 is formed in the drying chamber 302 and between the lower part of the outer peripheral wall of the connecting plate 312 and the lower part of the horizontal drying kettle 301. When the solid material passes through the grinding channel 318, the rotating grinding ring 313 grinds the solid material so that the solid material is ground into a predetermined particle size range. In this embodiment, additional grinding rings 313 can be installed on the outer peripheral walls of multiple drying disc bodies 311 on the mounting shaft 310 and close to the connecting disc 312. The size of the grinding channel 318 formed at these grinding rings 313 is in a progressive state, so that the solid material is ground progressively, and the solid material is ground from coarse to fine, thereby improving the grinding effect. In this embodiment, in order to facilitate the discharge of materials, a vibrator is installed on the horizontal drying kettle 301. When the vibrator is activated, the horizontal drying kettle 301 vibrates, prompting the material to move toward the discharge pipe 304.

[0065] The present invention also discloses a high-performance ternary positive electrode material, which is prepared according to the above-mentioned preparation method.

[0066] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A device for preparing high-performance ternary cathode materials, characterized in that: The invention comprises a first passive drainage type spiral mixing mechanism, a vacuuming end of the vacuum mixing mechanism is connected to the outlet end of the first passive drainage type spiral mixing mechanism, the outlet end of the vacuum mixing mechanism is connected to the inlet end of the multi-disc drying mechanism, the outlet end of the multi-disc drying mechanism is connected to the inlet end of the intermediate tank, the inlet end of the second passive drainage type spiral mixing mechanism is connected to the outlet end of the intermediate tank, and the outlet end of the second passive drainage type spiral mixing mechanism is connected to the inlet end of the material tank; the first passive drainage type spiral mixing mechanism comprises a vertical mixing cylinder with a fixed cover fixed at the upper end, a first feed pipe is constructed at the center of the fixed cover, a first control valve is installed on the first feed pipe, and a plurality of second feed pipes are evenly installed on the fixed cover along the circumference of the first feed pipe , a second control valve is installed on the second feed pipe, the first feed pipe and the second feed pipe are both connected to the mixing channel of the vertical mixing cylinder, and the lower end of the vertical mixing cylinder is connected to the vacuum end of the vacuum mixing mechanism; the vacuum mixing mechanism includes a coaxially arranged mounting pipe, a liquid inlet pipe and a liquid outlet pipe, the vacuum end is formed on the mounting pipe, a nozzle is configured at one end of the liquid inlet pipe extending into the mounting pipe, the liquid outlet pipe is connected to the outlet of the mounting pipe through a transition pipe, a negative pressure zone is formed in the area between the nozzle and the mounting pipe, a primary mixing zone is formed in the transition pipe, a secondary mixing zone is formed in the liquid outlet pipe, and the outlet end of the liquid outlet pipe is connected to the inlet end of the multi-disc drying mechanism; the multi-disc drying mechanism includes a horizontal drying mechanism with a gradually expanding diameter and a drying chamber formed inside A kettle, a sealing cover is detachably connected to the end of the large diameter end of the horizontal drying kettle, a discharge pipe is constructed at the lower part of the peripheral wall of the large diameter end of the horizontal drying kettle, and an exhaust pipe is constructed at the upper part of the peripheral wall of the large diameter end of the horizontal drying kettle, the discharge pipe and the exhaust pipe are both connected to the discharge chamber of the drying chamber, a drying disc group is coaxially rotatably connected in the horizontal drying kettle, one end of the drying disc group is connected to the outlet end of the vacuum mixing mechanism, and the other end of the drying disc group extends out of the sealing cover, an insulating cylinder is arranged outside the horizontal drying kettle, an assembly cavity is formed between the insulating cylinder and the horizontal drying kettle, an electric heating wire is installed in the assembly cavity, and the electric heating wire is spirally wound outside the horizontal drying kettle; the drying disc group includes a plurality of drying discs coaxially installed on the mounting shaft at intervals along the axis of the mounting shaft A body, a liquid guide channel is constructed in the installation shaft, a transfer joint is constructed at the center of the small diameter end of the horizontal drying kettle, the end of the installation shaft is rotatably connected to the transfer joint, and the liquid guide channel is communicated with the outlet end of the vacuum mixing mechanism through the transfer joint, a first liquid distribution cavity is constructed in each drying disc body, a plurality of first liquid distribution holes are evenly opened on the drying disc body, each of the first liquid distribution holes is communicated with the liquid guide channel through the first liquid distribution cavity, a plurality of scraper plates extending along the radial direction thereof are constructed on the inner wall of the horizontal drying kettle, the side wall of each scraper plate is close to or in contact with the side wall of the corresponding drying disc body, a transmission wheel is coaxially installed on one end of the installation shaft extending out of the sealing cover, and a material passing channel is formed in the drying cavity and between the lower part of the outer peripheral wall of each drying disc body and the lower part of the horizontal drying kettle;A connecting plate is coaxially constructed on the part of the mounting shaft close to the discharge chamber, a second liquid distribution chamber is constructed in the connecting plate, a plurality of second liquid distribution holes are evenly opened at one end of the connecting plate close to the drying plate body, each of the second liquid distribution holes is connected to the liquid guide channel through the second liquid distribution chamber, the end surface of the connecting plate close to the discharge chamber is in a closed state, a grinding ring is coaxially fixed on the outer peripheral wall of the connecting plate, and a grinding channel is formed in the drying chamber and between the lower part of the outer peripheral wall of the connecting plate and the lower part of the horizontal drying kettle. ; 2. The device for preparing a high-performance ternary cathode material according to claim 1, characterized in that: A plurality of spiral material guiding blades are constructed in the vertical mixing cylinder. The spiral material guiding blades are evenly arranged along the circumference of the vertical mixing cylinder, and each spiral material guiding blade extends spirally along the axis of the vertical mixing cylinder.

3. The device for preparing a high-performance ternary cathode material according to claim 2, characterized in that: A plurality of spiral material guide strips are uniformly constructed on the vertical mixing barrel along its circumference, each of the spiral material guide strips extends spirally along the axis of the vertical mixing barrel, and each spiral material guide blade is formed on a side of the corresponding spiral material guide strip extending into the vertical mixing barrel, a spiral material guide cavity is formed in the spiral material guide strip, a spiral material discharge cavity is formed in the spiral material guide blade, the spiral material guide cavity and the spiral material discharge cavity are connected to each other, the upper end of the spiral material guide cavity is connected to the corresponding second feed pipe, the side of the spiral material discharge cavity away from the spiral material guide strip is connected to the mixing channel, and the lower ends of the spiral material guide cavity and the spiral material discharge cavity are in a closed state.

4. The device for preparing a high-performance ternary cathode material according to claim 1, characterized in that: A plurality of spiral mixing blades are constructed in the liquid outlet pipe. The spiral mixing blades are evenly arranged along the circumference of the liquid outlet pipe, and each spiral mixing blade extends spirally along the axis of the liquid outlet pipe.

5. A method for preparing a high-performance ternary cathode material using the device according to any one of claims 1 to 4, characterized in that: The steps include: Step 1. Continuously and synchronously supply the following components with a particle size range of 120-200 nm to the first passive drainage type spiral mixing mechanism according to the mass fraction ratio. Nickel sulfate 2.4-2.8 parts, 1.5-1.9 parts of nickel nitrate, 3.7-4.1 parts of cobalt sulfate, Manganese sulfate 1.6-1.8 parts, Manganese nitrate 0.9-1.2 parts, Step 2. Pumping the sodium hydroxide solution into the vacuum mixing mechanism from the inlet port. When the sodium hydroxide solution passes through the vacuum mixing mechanism, the vacuum end of the vacuum mixing mechanism draws the material in the first passive drainage type spiral mixing mechanism into the vacuum mixing mechanism; Step 3. After the materials entering the vacuum mixing mechanism are mixed with the sodium hydroxide solution and the reaction is completed, they enter the multi-disc drying mechanism; Step 4. Control the operation of the multi-disc drying mechanism. After the reaction solution is dried by the multi-disc drying mechanism, a powder material with a particle size of 90-160 nm is obtained and collected in an intermediate tank; Step 5. Add the powder material in the intermediate tank into the second passive drainage type spiral mixing mechanism, and at the same time add 0.08-0.21 parts of a binder, 0.07-0.15 parts of a conductive agent, and 4.2-6.4 parts of lithium iron phosphate with a particle size of 4-5 μm into the second passive drainage type spiral mixing mechanism; then evacuate the second passive drainage type spiral mixing mechanism, and the materials are mixed in the second passive drainage type spiral mixing mechanism under negative pressure and enter the material tank; Step 6. The mixed material in the material tank is injected into the material placing sagger, and the material placing sagger is transported into the sintering chamber one by one through the conveying mechanism; Step 7. Pour the sintered material out of the sagger, crush and finely screen it, and then collect and pack the obtained powder.

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