CN216654366U - Equipment for producing precursor of positive electrode material - Google Patents
Equipment for producing precursor of positive electrode material Download PDFInfo
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- CN216654366U CN216654366U CN202220751126.2U CN202220751126U CN216654366U CN 216654366 U CN216654366 U CN 216654366U CN 202220751126 U CN202220751126 U CN 202220751126U CN 216654366 U CN216654366 U CN 216654366U
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Abstract
The application provides equipment for producing a precursor of a positive electrode material, relates to the technical field of batteries, and can obtain the precursor of the positive electrode material with excellent performance. The apparatus comprises: the reaction kettle is used for containing anode material precursor slurry, the anode material precursor slurry comprises a reaction solution and first anode material precursor particles, the first anode material precursor particles grow into second anode material precursor particles in the reaction solution, and the size of the second anode material precursor particles is larger than that of the first anode material precursor particles; the sanding device is connected with the reaction kettle and is used for sanding the second anode material precursor particles to obtain a plurality of first anode material precursor particles; and the material supplementing device is respectively connected with the reaction kettle and the sanding device and is used for adding the first anode material precursor particles obtained by the sanding device into the reaction kettle.
Description
Technical Field
The present application relates to the field of battery technology, and more particularly, to an apparatus for producing a precursor of a positive electrode material.
Background
With the consumption of natural resources, the development of new energy is gradually emphasized. Lithium ion batteries have attracted much attention because of their high energy density, high capacity, good cycling stability and environmental protection characteristics. The positive electrode material in the lithium ion battery has obvious influence on the performance of the battery, and the performance of the positive electrode material is directly related to the quality of the structure and the appearance of a precursor of the positive electrode material in the process of preparing the positive electrode material. Therefore, how to design an apparatus for producing a precursor of a positive electrode material to obtain a precursor of a positive electrode material with excellent performance is a problem to be solved.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides equipment for producing a precursor of a positive electrode material, and the precursor of the positive electrode material with excellent performance can be obtained.
In a first aspect, there is provided an apparatus for producing a precursor of a positive electrode material, comprising: the reaction kettle is used for accommodating anode material precursor slurry, the anode material precursor slurry comprises a reaction solution and first anode material precursor particles, the first anode material precursor particles grow into second anode material precursor particles in the reaction solution, and the size of the second anode material precursor particles is larger than that of the first anode material precursor particles; the sanding device is connected with the reaction kettle and is used for sanding the second anode material precursor particles to obtain a plurality of first anode material precursor particles; and the material supplementing device is respectively connected with the reaction kettle and the sanding device and is used for adding the first anode material precursor particles obtained by the sanding device into the reaction kettle.
The equipment for producing the precursor of the cathode material can realize continuous production of the precursor of the cathode material under the condition of not changing reaction conditions in the reaction kettle, the inner layer and the outer layer of the precursor of the cathode material produced by the equipment have consistent crystal structures, and the precursor of the cathode material has higher crystallinity, is more favorable for the insertion of lithium ions in the preparation process of the cathode material of the lithium ion battery, and can effectively improve the performance of the battery prepared by adopting the cathode material. Meanwhile, the positive electrode material precursor with good performance can be produced by only one device, so that the production efficiency can be greatly improved, the occupation of a reaction kettle on a field is reduced, and the production cost is reduced.
In some embodiments, the sanding device includes a housing cavity having a sanding material received therein that sands the second positive material precursor particles in the housing cavity, and a first interface for communicating the sanding device with the replenishment feed device.
The chamber that holds among the sanding device provides the sanding space for the sanding of second cathode material precursor granule for the great second cathode material precursor granule of particle diameter can be in holding the chamber by the sanding for the less first cathode material precursor of particle diameter, the third interface provides the passageway for the first cathode material precursor that obtains after the sanding in adding reation kettle simultaneously, be favorable to this equipment to prepare the cathode material precursor that inlayer and outer crystal structure are unanimous, thereby can utilize this kind of cathode material precursor to prepare excellent performance's cathode material.
In some embodiments, the sanding device includes a material suction member, one end of the material suction member is located below the liquid level of the cathode material precursor slurry, and the other end of the material suction member is communicated with the accommodating cavity, and the material suction member is used for transferring the second cathode material precursor particles in the reaction kettle into the accommodating cavity.
The arrangement of the material sucking component can conveniently transfer the second anode material precursor particles in the reaction kettle to the sanding device, and no additional equipment is needed to realize the process. Simultaneously, directly be connected sanding device and reation kettle through inhaling the material part, can adjust in real time and inhale the volume that the material part transferred second anode material precursor granule in unit interval, be favorable to controlling whole production process.
In some embodiments, the feeding device comprises a second interface and a third interface, the second interface is used for communicating the feeding device with the sanding device, and the third interface is used for communicating the feeding device with the reaction kettle.
The material supplementing device is respectively connected with the reaction kettle and the sand grinding device through different interfaces, so that first anode material precursor particles can grow into second anode material precursor particles in the reaction kettle, the second particles are sand ground into first anode material precursor particles in the sand grinding device, and the first anode material precursor particles are added into the reaction kettle by the material supplementing device to form a continuous process, so that the anode material precursor can be continuously produced on the same equipment, and the production efficiency can be greatly improved.
In some embodiments, the feeding apparatus further includes a storage tank, the storage tank is configured to store the first positive electrode material precursor particles obtained by the sanding apparatus, the second interface is configured to enable the storage tank to obtain the first positive electrode material precursor particles from the sanding apparatus, and the third interface is configured to add the first positive electrode material precursor particles in the storage tank to the reaction kettle.
The storage tank can temporarily store the first anode material precursor particles obtained after the sanding of the sanding device, the reaction in the reaction kettle can be controlled by adding the first anode material precursor particles into the reaction kettle at a proper time, and enough time can be reserved for the sanding device to sand the second anode material precursor particles into the first anode material precursor particles, so that the continuous production of the anode material precursor can be realized by the equipment for producing the anode material precursor, and the production efficiency is improved.
In some embodiments, the storage tank is provided with a first stirring portion for stirring the first cathode material precursor particles in the storage tank.
The first stirring part continuously stirs in the storage tank, so that the blockage of a third interface caused by the accumulation of the first anode material precursor particles in the storage tank can be avoided, wherein the third interface is used for adding the anode material precursor particles in the storage tank into the reaction kettle. Simultaneously, first stirring portion can also make the particle size distribution of the granule of adding in reation kettle even, avoids because the error that produces in the particle diameter when sanding device is to second anode material precursor granule, and leads to the first anode material precursor granule particle diameter of different time quantums to add in reation kettle to differ great to the growth process of anode material precursor granule in can controlling reation kettle better.
In some embodiments, the feeding apparatus further comprises a filter sieve disposed at the third interface, so that the first cathode material precursor particles are fed into the reaction kettle through the filter sieve, for controlling the size of the first cathode material precursor particles fed into the reaction kettle.
The filter screen can ensure that the particle size of the first anode material precursor particles added into the reaction kettle is in an expected range, so that the reaction process in the reaction kettle can be controlled more accurately, and the production of the anode material precursor with good performance is facilitated.
In some embodiments, the reaction kettle is provided with a collection port for outputting the first and/or second positive electrode material precursor particles out of the reaction kettle when the liquid level of the positive electrode material precursor slurry is higher than or equal to the collection port.
The collecting port can conveniently obtain the anode material precursor particles meeting the requirements, and the reaction in the reaction kettle is not influenced when the anode material precursor particles meeting the particle size requirements are obtained from the collecting port, so that the continuous production can be realized when the anode material precursor is produced by using the equipment, and the production efficiency is improved while the anode material precursor with excellent performance is obtained.
In some embodiments, a second stirring part and a flow baffle plate are disposed in the reaction kettle, the second stirring part is used for stirring the positive electrode material precursor slurry in the reaction kettle, the flow baffle plate is disposed along an inner wall of the reaction kettle and distributed around the second stirring part, and the flow baffle plate is used for blocking flow of the second stirring part during stirring.
The arrangement of the second stirring part and the flow baffle plate can fully stir the anode material precursor slurry in the reaction kettle, so that the reaction in the anode material precursor slurry is promoted, and the preparation of the anode material precursor particles with high crystallinity and excellent morphology is facilitated.
In some embodiments, the sanding device is provided with a third stirring portion for stirring the sanding material and the second positive electrode material precursor particles in the housing chamber so that the second positive electrode material precursor particles are broken into a plurality of first positive electrode material precursor particles after colliding with the sanding material.
The third stirring portion can make the sufficient extrusion collision of sanding material and second cathode material precursor granule to make second cathode material precursor granule can be sanded for the suitable first cathode material precursor granule of particle size, in order to add reation kettle when needing, the going on of reaction among the control reation kettle provides the reaction basis for the production of cathode material precursor.
In some embodiments, the apparatus further comprises: the control module is used for controlling the third interface to be opened when the size of the second anode material precursor particles in the reaction kettle is larger than or equal to a first threshold value.
The control module can control the particle size of the precursor particles of the anode material in the reaction kettle by controlling the third interface, so that the crystal structures of the precursor particles of the first anode material and the precursor particles of the second anode material in the reaction kettle are consistent, and the crystal structures of the inner layer and the outer layer of the same precursor particle of the anode material are also consistent, thereby being beneficial to preparing the precursor of the anode material with high crystallinity and excellent appearance.
In some embodiments, the control module is further configured to control the first interface to open when the size of the first positive electrode material precursor particles in the sanding device is less than or equal to a second threshold.
The control module can guarantee the particle size of the first anode material precursor particles obtained after sanding in the sanding device through controlling the first interface, so that the particle size of the anode material precursor particles in the reaction kettle can be effectively controlled in the subsequent production process, and the production of the anode material precursor with high crystallinity and excellent appearance is facilitated.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for a person skilled in the art to obtain other drawings based on the drawings without any creative effort.
Fig. 1 is a schematic structural diagram of an apparatus for producing a precursor of a positive electrode material according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a sanding device in an apparatus for producing a positive electrode material precursor according to an embodiment of the present disclosure.
Fig. 3 is a schematic structural diagram of a storage tank in an apparatus for producing a precursor of a positive electrode material according to an embodiment of the present disclosure.
The reference numbers in the detailed description are as follows:
10-a reaction kettle, 11-a collection port, 12-a second stirring part, 13-a flow baffle, 121-a second motor, 122-a second stirring shaft and 123-a second stirring paddle;
20-a sanding device, 21-a containing cavity, 22-a first interface, 23-a material sucking part, 24-a third stirring part, 25-a first base, 241-a third stirring shaft, 242-a third stirring paddle and 243-a third motor;
30-feeding device, 31-second interface, 32-third interface, 33-storage tank, 34-second base, 331-first stirring part, 332-first stirring shaft, 333-first stirring paddle, 334-first motor and 335-filter screen.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.
In the description of the present application, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, indicate an orientation or positional relationship that is merely for convenience in describing the application and to simplify the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. "vertical" is not strictly vertical, but is within the tolerance of the error. "parallel" is not strictly parallel but within the tolerance of the error.
The following description is given with the directional terms as they are used in the drawings and not intended to limit the specific structure of the present application. In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood as appropriate by one of ordinary skill in the art.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different elements and not for describing a particular sequential or chronological order.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The term "and/or" in this application is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in this application generally indicates that the former and latter related objects are in an "or" relationship.
In the embodiments of the present application, like reference numerals denote like parts, and a detailed description of the same parts is omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width and other dimensions of the various components in the embodiments of the present application and the overall thickness, length, width and other dimensions of the integrated device shown in the drawings are only exemplary and should not constitute any limitation to the present application.
The "plurality" in the present application means two or more (including two), and similarly, "plural" means two or more (including two) and "plural" means two or more (including two).
In the embodiment of the present application, the positive electrode material refers to an active material coated on the surface of a positive electrode current collector, and a positive electrode sheet in a battery cell includes the positive electrode current collector and the positive electrode active material. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The structure of the anode material has inheritance to the structure of the precursor, namely the performance of the anode material is directly related to the structure and the appearance of the precursor, and the anode material precursor with good performance needs to be prepared first to obtain the anode material with good performance.
The preparation of the precursor of the cathode material needs to consider various factors, such as the pH value of the preparation environment, the grain size, the grain growth speed and the like. At present, the equipment for preparing the anode material generally introduces alkali liquor into a reaction kettle, the alkali liquor forms a high pH environment before being completely diluted, and forms a low pH environment after being completely diluted. Soluble salt solution added into the reaction kettle generates precursor particles with smaller granularity in a high pH environment, and grows into precursor particles with larger granularity in a low pH environment, and the environments of the two conditions are repeatedly switched to achieve the purpose of continuous production. The preparation method is not easy to control environmental conditions, the prepared environmental system has large fluctuation, the particle size of the precursor particles prepared in a high pH environment is small, the precursor particles prepared in a low pH environment are overlapped and dispersed, the particle size of the precursor particles prepared in the low pH environment is large, the overlap joint is dense, the structures of the precursor particles and the overlap joint are inconsistent, and the performance of the subsequently prepared anode material is poor. If two reaction kettles are adopted to be matched in series, a high pH environment is kept in one reaction kettle to prepare a precursor with smaller particle size, and a low pH environment is kept in the other reaction kettle to enable the precursor with small particles to grow into large particles, so that the precursor of the anode material with high appearance consistency can be obtained, but the problem of inconsistency of the crystal nucleus preparation and the crystal nucleus growth conditions still exists in the inner layer and the outer layer of the prepared precursor of the anode material. In addition, the preparation method needs two reaction kettles to be matched, so that the reaction kettle resources are occupied, and the preparation cost of the precursor of the anode material is not easy to control.
In view of this, the present application provides an apparatus for producing a positive electrode material precursor, a reaction kettle of the apparatus is connected with a sanding device and a material supplementing device, the sanding device can sand positive electrode material precursor particles with a larger particle size prepared in the reaction kettle into positive electrode material precursor particles with a smaller particle size, and the positive electrode material precursor particles with a smaller particle size are added into the reaction kettle through the material supplementing device to grow into positive electrode material precursor particles with a larger particle size. The positive electrode material precursor particles with larger particle size can be sanded into a plurality of positive electrode material precursor particles with smaller particle size, so that the positive electrode material precursor is produced by the equipment, a large number of positive electrode material precursor particles with smaller particle size can be obtained under the condition that the reaction condition in the reaction kettle is not changed, the growth speed and the particle size distribution of the positive electrode material precursor particles in the reaction kettle are regulated and controlled by controlling the adding amount of the positive electrode material precursor particles with smaller particle size, and the whole production process can be completed under the condition that only one reaction kettle is used. Meanwhile, the equipment can prepare the precursor particles of the anode material with high crystal structure consistency, and is beneficial to the subsequent preparation of the anode material with excellent performance.
The technical scheme described in the embodiment of the application is suitable for preparing various anode material precursors. For example, lithium nickelate, lithium cobaltate, lithium manganate precursor, lithium nickelate binary precursor, lithium nickelate ternary precursor NixCoyMn1-x-y (OH)2(x is more than or equal to 0 and less than or equal to 1, y is more than or equal to 0 and less than or equal to 1, and 0-x-y is more than or equal to 1); nickel cobalt lithium aluminate ternary precursor NixCoyAl1-x-y (OH)2(x is more than or equal to 0 and less than or equal to 1, y is more than or equal to 0 and less than or equal to 1, and 0-x-y is more than or equal to 1); quaternary precursor Ni of nickel cobalt manganese lithium aluminatexCoyMnzAl1-x-y-z (OH)2(x is more than or equal to 0 and less than or equal to 1, y is more than or equal to 0 and less than or equal to 1, z is more than or equal to 0 and less than or equal to 1, and 1-x-y-z is more than or equal to 0 and less than or equal to 1), and the like. For convenience of explanation, the following examples take ternary precursors as examples, and it should be understood that the apparatus for producing a precursor of a positive electrode material provided in the present application is not limited to producing a ternary precursor material, and can also produce other precursors of a positive electrode material.
The following describes in detail an apparatus for producing a precursor of a positive electrode material according to an embodiment of the present application with reference to fig. 1 to 3.
As shown in fig. 1, fig. 1 is a schematic structural diagram of an apparatus for producing a precursor of a positive electrode material according to an embodiment of the present disclosure, and the apparatus includes a reaction kettle 10, a sanding device 20, and a feeding device 30. The reaction kettle 10 is configured to accommodate a precursor slurry of the positive electrode material, where the precursor slurry of the positive electrode material includes a reaction solution and first precursor particles of the positive electrode material, the first precursor particles of the positive electrode material grow into second precursor particles of the positive electrode material in the reaction solution, and the size of the second precursor particles of the positive electrode material is larger than that of the first precursor particles of the positive electrode material. The sanding device 20 is connected with the reaction kettle 10 and is used for sanding the second anode material precursor particles to obtain a plurality of first anode material precursor particles. The material supplementing device 30 is respectively connected with the reaction kettle 10 and the sand grinding device 20, and is used for adding the first anode material precursor particles obtained by the sand grinding device 20 into the reaction kettle 10.
The reaction kettle 10 is a part of the apparatus for producing the precursor of the positive electrode material, which is used for accommodating a precursor slurry of the positive electrode material, and the precursor slurry of the positive electrode material includes a reaction solution and first precursor particles of the positive electrode material. The reaction solution may provide a desired environment for the generation or growth of the cathode material precursor particles, for example, the reaction solution may include a metal salt solution, a sodium hydroxide solution with a certain concentration, and ammonia water, which are required for preparing the cathode material precursor particles, and thus the reaction solution is actually a mixture. The first positive electrode material precursor particles are positive electrode material precursor particles with small particle sizes, and react with the metal salt solution in the reaction solution to grow into positive electrode material precursor particles with large particle sizes, namely second positive electrode material precursor particles. The particle size of the first positive electrode material precursor particles can be 1.5-3.0 microns, and the size of the second positive electrode material precursor particles is larger than that of the first positive electrode material precursor particles.
The positive electrode material precursor slurry may be reacted in the reaction kettle 10 to obtain positive electrode material precursor particles. The reaction in the reaction kettle 10 may be, for example, growth of first cathode material precursor particles with a smaller particle size into second cathode material precursor particles with a larger particle size, or preparation of cathode material precursor particles with a smaller particle size in a high pH environment at an initial stage of preparing the cathode material precursor, and then adjustment of the cathode material precursor slurry to a low pH environment to obtain cathode material precursor particles with a larger particle size. Wherein, a high pH environment may refer to a reaction solution having a pH value of 12 or more, and a low pH environment may refer to a reaction solution having a pH value of less than 12.
The sanding device 20 is a device for sanding the second positive electrode material precursor particles having a large particle diameter into the first positive electrode material precursor particles having a small particle diameter. The sanding device 20 actually obtains the anode material precursor slurry when obtaining the second anode material precursor, and the anode material precursor slurry may further include second anode material precursor particles along with the growth of the first anode material precursor in the reaction kettle 10. The sanding device 20 sands the second positive electrode material precursor particles, and in fact, the obtained positive electrode material precursor slurry. That is, after the first positive electrode material precursor particles in the reaction kettle 10 have grown for a period of time, a portion of the positive electrode material precursor slurry is extracted and put into the sanding device 20, and then in the sanding process of the sanding device 20, the second positive electrode material precursor particles in the positive electrode material precursor slurry can be sanded into a plurality of first positive electrode material precursor particles.
Sanding device 20 can be connected as a whole with reation kettle 10 through first base 25, transfers the anodal material precursor thick liquids in reation kettle 10 to sanding device 20 by external equipment in, also can be connected with reation kettle 10 through inhaling material part 23, directly shifts the anodal material precursor thick liquids in reation kettle 10 to sanding device 20 by inhaling material part 23.
The material supplementing device 30 is respectively connected with the reaction kettle 10 and the sand grinding device 20, and is used for adding the first anode material precursor particles obtained by the sand grinding device 20 into the reaction kettle 10. Feed supplement device 30 one end is connected with sanding device 20 for obtain the first anode material precursor granule that obtains after the sanding from sanding device 20, the other end is connected with reation kettle 10, is arranged in adding the first anode material precursor granule that obtains to reation kettle 10. Since the sanding in the sanding device 20 is actually positive electrode material precursor slurry, what the replenishing device 30 actually obtains when obtaining the first positive electrode material precursor particles from the sanding device 20 is also positive electrode material precursor slurry, which includes the first positive electrode material precursor particles obtained by sanding the second positive electrode material precursor particles. Similarly, the feeding device 30 adds the first cathode material precursor particles into the reaction kettle 10, and the actually added cathode material precursor slurry also includes the first cathode material precursor particles obtained by sanding the second cathode material precursor particles.
One second cathode material precursor particle may be sanded into a plurality of first cathode material precursor particles, each of which may be grown into a second cathode material precursor particle. That is, a small amount of the second cathode material precursor particles can provide a large amount of the first cathode material precursor particles, thereby enabling continuous production of the cathode material precursor particles. Meanwhile, in the process that the anode material precursor particles with larger particle sizes are sanded into the anode material precursor particles with smaller particle sizes and then added into the reaction kettle 10 again, the anode material precursor particles with smaller particle sizes can be provided for the reaction in the reaction kettle 10, and the reaction conditions in the reaction kettle 10 do not need to be changed, so that the inner layer and the outer layer of the prepared anode material precursor particles have the same crystal structure and higher crystallinity. Taking a ternary precursor as an example, in the ternary precursor prepared by the device for producing the precursor of the cathode material, the characteristic peak of the crystal plane parameter 001 obtained by X-ray diffraction test is lower than the characteristic peak of the crystal plane parameter 101, so that the device is more beneficial to the insertion of lithium ions in the preparation process of the cathode material of the lithium ion battery, and the performance of the battery prepared by adopting the cathode material can be effectively improved.
The equipment for producing the precursor of the cathode material can realize continuous production of the precursor of the cathode material under the condition of not changing the reaction conditions in the reaction kettle 10, the inner layer and the outer layer of the precursor of the cathode material produced by the equipment have consistent crystal structures, and the precursor of the cathode material has higher crystallinity, is more favorable for the insertion of lithium ions in the preparation process of the cathode material of a lithium ion battery, and can effectively improve the performance of the battery prepared by adopting the cathode material. Meanwhile, the positive electrode material precursor with good performance can be produced by only one device, so that the production efficiency can be greatly improved, the occupation of the reaction kettle 10 on the field is reduced, and the production cost is reduced.
According to some embodiments of the present application, optionally, the sanding device 20 includes a containing cavity 21 and a first interface 22, the containing cavity 21 contains a sanding material, the sanding material sands the second positive electrode material precursor particles in the containing cavity 21, and the first interface 22 is used for communicating the sanding device 20 with the replenishing device 30.
As can be seen in conjunction with fig. 1 and 2, the sanding device 20 may include a housing chamber 21 in which the second positive electrode material precursor particles are sanded with a sanding material in the housing chamber 21. The housing chamber 21 typically contains a sanding material therein to sand the second positive electrode material precursor particles. In one possible embodiment, the sanding material may be zirconium beads, and sanding of the second positive electrode material precursor particles is achieved by using compressive collision between the zirconium beads and the positive electrode material precursor particles. The sanding device 20 can provide the power for the extrusion collision of the sanding material and the second positive electrode material precursor particles through self vibration or rotation, and the sanding material and the second positive electrode material precursor particles can also be stirred in the sanding device 20 to generate the extrusion collision of the sanding material and the second positive electrode material precursor particles.
In addition, the sample in the sanding device 20 may be extracted at regular intervals, and the particle size of the sample may be detected to control the particle size of the first positive electrode material precursor particles obtained after sanding. If the desired particle size is not achieved, the sanding time may be extended to allow the particles in the sanding device 20 to be sanded to smaller particle sizes. That is, the particle size of the first positive electrode material precursor particles after sanding can be controlled by controlling the sanding time of the sanding device 20.
The sanding device 20 may further include a first interface 22, the first interface 22 is a portion of the sanding device 20, which is communicated with the replenishing device 30, and the sanding device 20 transfers the first positive electrode material precursor particles obtained after sanding to the replenishing device 30 through the first interface 22, so that the replenishing device 30 can add the first positive electrode material precursor particles into the reaction kettle 10.
The chamber 21 that holds among the sanding device 20 provides the sanding space for the sanding of second cathode material precursor granule, make the great second cathode material precursor granule of particle diameter can be in holding chamber 21 by the sanding for the less first cathode material precursor of particle diameter, third interface 32 provides the passageway in adding reation kettle 10 for the first cathode material precursor that obtains after the sanding simultaneously, be favorable to this equipment to prepare out the unanimous cathode material precursor of inlayer and outer crystal structure, thereby can utilize this kind of cathode material precursor to prepare excellent performance's cathode material.
According to some embodiments of the present application, optionally, the sanding device 20 includes a suction member 23, one end 231 of the suction member 23 is located below the liquid level of the cathode material precursor slurry, and the other end 232 is communicated with the receiving cavity 21, and the suction member 23 is used for transferring the second cathode material precursor particles in the reaction kettle 10 into the receiving cavity 21.
One end 231 of the material suction part 23 is communicated with the reaction kettle 10 and extends to a position below the liquid level of the anode material precursor slurry in the reaction kettle 10, so that the material suction part 23 can suck the second anode material precursor particles in the reaction kettle 10. The other end 232 of the suction member 23 communicates with the housing chamber 21 of the sanding device 20 to transfer the sucked second positive electrode material precursor particles into the housing chamber 21. In an actual production process, the material sucking part 23 may suck the positive electrode material precursor slurry, where the positive electrode material precursor slurry includes the second positive electrode material precursor particles.
The arrangement of the suction member 23 can transfer the second precursor particles of the positive electrode material in the reaction vessel 10 to the sanding device 20 more conveniently without preparing additional equipment to perform the process. Meanwhile, the sanding device 20 is directly connected with the reaction kettle 10 through the material sucking part 23, the amount of the material sucking part 23 transferring the second anode material precursor particles in unit time can be adjusted in real time, and the whole production process can be controlled conveniently.
According to some embodiments of the present application, optionally, the feeding device 30 includes a second interface 31 and a third interface 32, the second interface 31 is used for communicating the feeding device 30 with the sanding device 20, and the third interface 32 is used for communicating the feeding device 30 with the reaction kettle 10.
The part of the replenishing means 30 intended to communicate with the sanding device 20 is the second interface 31, and the second interface 31 and the first interface 22 may refer to the same part, i.e. the first interface 22 is the part of the part belonging to the sanding device 20 and the second interface 31 is the part of the part belonging to the replenishing means 30. The feeding device 30 obtains the first anode material precursor particles from the sanding device 20 through the second interface 31, and adds the first anode material precursor particles into the reaction kettle 10 through the third interface 32.
The material supplementing device 30 is respectively connected with the reaction kettle 10 and the sand grinding device 20 through different interfaces, so that first anode material precursor particles can grow into second anode material precursor particles in the reaction kettle 10, the second particles can be ground into first anode material precursor particles in the sand grinding device 20, the first anode material precursor particles are added into the reaction kettle 10 through the material supplementing device 30 and are a continuous process, continuous production of the anode material precursor on the same equipment is realized, and the production efficiency can be greatly improved.
According to some embodiments of the present application, optionally, the feeding device 30 further includes a storage tank 33, the storage tank 33 is used for storing the first cathode material precursor particles obtained by the sanding device 20, the second interface 31 is used for the storage tank 33 to obtain the first cathode material precursor particles from the sanding device 20, and the third interface 32 is used for adding the first cathode material precursor particles in the storage tank 33 into the reaction kettle 10.
In the production of the positive electrode material precursor particles, a target particle diameter, which may be the size of D50, is set. D50 refers to the particle size corresponding to a cumulative percent particle size distribution of 50% for a sample, and has the physical meaning that particles having a size greater than that size account for 50% and particles having a size less than that size account for 50%.
The target particle diameter may be set to 10 μm, for example. In order to avoid that the growth speed of the precursor particles of the positive electrode material is too high, and the precursor particles of the positive electrode material growing to the target particle size cannot be collected in time, the first precursor particles of the positive electrode material are often added when the distance D50 of the precursor particles of the positive electrode material is about 2 micrometers from the target particle size, so as to slow down the growth speed of the existing particles in the precursor slurry of the positive electrode material.
Because the sanding device 20 needs certain time with the first cathode material precursor granule of second cathode material precursor granule sanding to anticipated particle size, consequently can't guarantee that sanding device 20 has obtained a batch first cathode material precursor granule that satisfies the requirement just when needing to add first cathode material precursor granule in reation kettle 10, and sanding device 20 adds first cathode material precursor granule in reation kettle 10 in the time of waiting for the opportunity after accomplishing a sanding, also delays subsequent sanding process easily.
The material supplementing device 30 is provided with the storage tank 33, so that the first anode material precursor particles obtained by the sanding device 20 can be stored, and when the first anode material precursor particles need to be added into the reaction kettle 10, the first anode material precursor particles obtained after sanding are added into the reaction kettle 10 from the storage tank 33, so as to regulate and control the reaction process in the reaction kettle 10. Specifically, the second interface 31 in the material supplementing device 30, which is communicated with the sanding device 20, can transfer the first positive electrode material precursor particles obtained by sanding in the sanding device 20 to the storage tank 33 for temporary storage, and when the first positive electrode material precursor particles need to be added into the reaction kettle 10, the first positive electrode material precursor particles in the storage tank 33 are added into the reaction kettle 10 through the third interface 32 in the material supplementing device 30, which is communicated with the reaction kettle 10, so that the reaction in the reaction kettle 10 can be continuously performed.
According to some embodiments of the present application, optionally, the storage tank 33 is provided with a first stirring part 331, and the first stirring part 331 is used for stirring the first cathode material precursor particles in the storage tank 33.
FIG. 3 further shows the internal structure of the storage tank 33 of the feeding apparatus 30. As shown in fig. 3, a first stirring portion 331 may be provided in the storage tank 33 for stirring the first positive electrode material precursor pellets in the storage tank 33. The first stirring part 331 may include a first stirring shaft 332 and a first stirring paddle 333, and the first stirring shaft 332 is controlled by a first motor 334 to rotate with a straight line in a first direction as a rotation axis, where the first direction is an axial direction of the first stirring shaft 332. The first agitating paddles 333 are perpendicular to the first agitating shaft 332 and are arranged at equal intervals in the first direction. The first stirring paddle 333 is fixedly connected to the first stirring shaft 332, and when the first stirring shaft 332 rotates under the control of the first motor 334, the first stirring paddle 333 is driven by the first stirring shaft 332 to rotate together.
The first stirring portion 331 continuously stirs in the storage tank 33, so that the first cathode material precursor particles can be prevented from being accumulated in the storage tank 33 to cause blockage of the third interface 32, wherein the third interface 32 is used for adding the cathode material precursor particles in the storage tank 33 into the reaction kettle 10. Meanwhile, the first stirring portion 331 can also make the particle size distribution of the particles added into the reaction kettle 10 uniform, and avoid that the particle size of the first anode material precursor particles added into the reaction kettle 10 in different time periods differs greatly due to the error generated in the particle size when the sanding device 20 sands the second anode material precursor particles, so that the growth process of the anode material precursor particles in the reaction kettle 10 can be better controlled.
According to some embodiments of the present application, optionally, the feed supplement device 30 further comprises a filter sieve 335, and the filter sieve 335 is disposed at the third interface 32, so that the first cathode material precursor particles are fed into the reaction vessel 10 through the filter sieve 335, for controlling the size of the first cathode material precursor particles fed into the reaction vessel 10.
The filter screen 335 may be disposed on a side of the third interface 32 facing the storage tank 33, such as the position shown in fig. 3, or may be disposed on a side of the third interface 32 facing the reaction tank 10 (not shown), and the size of the filter screen 335 may be slightly larger than the size of the cross section of the third interface 32. Since the filter sieve 335 allows only particles having a particle size smaller than the mesh size to pass through, particles of the positive electrode material precursor having a larger particle size may not pass through the filter sieve 335, and thus, the portion that does not pass through the filter sieve 335 may be reintroduced into the sanding apparatus 20 for further sanding after a certain period of time.
The filter sieve 335 can ensure that the particle size of the first anode material precursor particles added into the reaction kettle 10 is within an expected range, which is beneficial to more accurately controlling the reaction process in the reaction kettle 10 and is beneficial to producing the anode material precursor with good performance.
According to some embodiments of the present application, optionally, the reaction vessel 10 is provided with a collection port 11, and the collection port 11 is used for outputting the first positive electrode material precursor particles and/or the second positive electrode material precursor particles out of the reaction vessel 10 when the liquid level of the positive electrode material precursor slurry is higher than or equal to the collection port 11.
In the process of growing the first anode material precursor particles into the second anode material precursor particles in the reaction kettle 10, since the volume of the anode material precursor particles becomes larger, the liquid level of the anode material precursor slurry contained in the reaction kettle 10 may gradually rise, and when the liquid level of the anode material precursor slurry is higher than or equal to the collection port 11, the first anode material precursor particles and/or the second anode material precursor particles in the anode material precursor slurry may be output from the reaction kettle 10 through the collection port 11.
In the production process, samples can be extracted from the reaction kettle 10 at intervals for detection, if the detection result of the samples shows that the D50 of the anode material precursor particles in the interval has reached the requirement and the liquid level has not reached the height of the collection port 11, the reaction solution can be added into the reaction kettle 10 through other interfaces arranged on the reaction kettle 10, such as a salt inlet and an ammonia-soda inlet, so that the liquid level reaches the height of the collection port 11, the anode material precursor particles meeting the requirement are discharged through the collection port 11, and meanwhile, the reaction solution can be provided for the growth of subsequent particles.
In actual production, the cathode material precursor slurry output through the collection port 11 can include cathode material precursor particles with various particle sizes, so that the cathode material precursor particles output from the collection port 11 can include particles with various particle sizes under the condition of meeting the requirement of D50.
The collecting port 11 can conveniently obtain the anode material precursor particles meeting the requirements, and when the anode material precursor particles meeting the particle size requirements are obtained from the collecting port 11, the ongoing reaction in the reaction kettle 10 is not influenced, so that the continuous production can be realized when the anode material precursor is produced by using the device, and the production efficiency is improved while the anode material precursor with excellent performance is obtained.
According to some embodiments of the present application, optionally, a second stirring part 12 and a flow baffle plate 13 are disposed inside the reaction kettle 10, the second stirring part 12 is used for stirring the anode material precursor slurry in the reaction kettle 10, the flow baffle plate 13 is disposed along the inner wall of the reaction kettle 10 and distributed around the second stirring part 12, and the flow baffle plate 13 is used for blocking the flow of the second stirring part 12 during stirring.
Similar to the first stirring part 331, the second stirring part 12 may include a second stirring shaft 122 and a second stirring paddle 123, and the second stirring shaft 122 is controlled by the second motor 121 to rotate around a straight line in a first direction as a rotation axis, where the first direction is an axial direction of the second stirring shaft 122. The second stirring paddles 123 are perpendicular to the second stirring shaft 122 and are arranged at intervals in the first direction. The second stirring paddle 123 is fixedly connected to the second stirring shaft 122, and one end of the second stirring paddle 123 far away from the second stirring shaft 122 can be connected by a connecting member, so that the connecting member is parallel to the second stirring shaft 122 to form a part of the second stirring paddle 123. When the second stirring shaft 122 is rotated under the control of the second motor 121, the second stirring paddle 123 is rotated together by the second stirring shaft 122. The second stirring unit 12 can stir the positive electrode material precursor slurry in the reaction tank 10 while rotating in the reaction tank 10, thereby promoting the reaction in the reaction tank 10.
The baffle plate 13 may be a vertically disposed plate in the reaction vessel 10, and is distributed at equal intervals along the inner wall of the reaction vessel 10. The baffle plate 13 is generally used to break the vortex formed by stirring when the second stirring part 12 stirs the cathode material precursor slurry, so that the cathode material precursor slurry in the reaction kettle 10 forms an axial flow and quickly reenters the region where the second stirring part 12 can stir. Therefore, the flow baffle 13 is distributed around the second stirring portion 12, which does not affect the stirring of the second stirring portion 12, and can sufficiently stir the precursor slurry of the positive electrode material in the reaction kettle 10.
The arrangement of the second stirring part 12 and the baffle plate 13 can fully stir the precursor slurry of the positive electrode material in the reaction kettle 10, thereby promoting the reaction in the precursor slurry of the positive electrode material, and facilitating the preparation of the precursor particles of the positive electrode material with high crystallinity and excellent morphology.
According to some embodiments of the present application, optionally, the sanding device 20 is provided with a third stirring portion 24, and the third stirring portion 24 is used for stirring the sanding material and the second positive electrode material precursor particles in the accommodating chamber 21, so that the second positive electrode material precursor particles are broken into a plurality of first positive electrode material precursor particles after colliding with the sanding material.
The third stirring part 24 is disposed in the sanding device 20, and may include a third stirring shaft 241 and a third stirring paddle 242, where the third stirring shaft 241 is controlled by a third motor 243 to rotate around a straight line in a first direction as a rotation axis, and the first direction is an axial direction of the third stirring shaft 241. The third agitating paddles 242 are perpendicular to the third agitating shaft 241 and are arranged at equal intervals in the first direction. The third stirring paddle 242 is fixedly connected to the third stirring shaft 241, and when the third stirring shaft 241 rotates under the control of the third motor 243, the third stirring paddle 242 is driven by the third stirring shaft 241 to rotate together. Because the sanding material and the second positive electrode material precursor particles are contained in the containing cavity 21 of the sanding device 20, the third stirring part 24 can stir the sanding material and the second positive electrode material precursor particles simultaneously in the stirring process in the containing cavity 21, so that the sanding material and the second positive electrode material precursor particles can be fully extruded and collided to sand the second positive electrode material precursor particles.
Third stirring portion 24 can make sanding material fully extrude the collision with second cathode material precursor granule to make second cathode material precursor granule can be sanded into the suitable first cathode material precursor granule of particle size, so that add reation kettle 10 when needing, the going on of reaction in the control reation kettle 10 provides the reaction basis for the production of cathode material precursor.
According to some embodiments of the application, optionally, the apparatus further comprises: and the control module is used for controlling the third interface 32 to be opened when the size of the second anode material precursor particles in the reaction kettle 10 is larger than or equal to the first threshold value.
The third interface 32 in the feeding device 30 is configured to add the first cathode material precursor particles obtained by sanding into the reaction kettle 10, and the control module is configured to determine a time for turning on the third interface 32 to add the first cathode material precursor particles into the reaction kettle 10.
Specifically, the control module may obtain the size of the second cathode material precursor particles in the reaction kettle 10 at intervals, which may be the size of D50 of the cathode material precursor particles. When the size of the second cathode material precursor particles is greater than or equal to the first threshold, the control module may be configured to open the third interface 32, and then the first cathode material precursor particles obtained by sanding in advance may be added to the reaction kettle 10 to control the particle size of the particles in the reaction kettle 10.
After the apparatus for producing the cathode material precursor is put into production, the first cathode material precursor particles are added into the reaction kettle 10 through the third interface 32, so as to form a continuous process. The control module may still control the opening size of the third interface 32 through the obtained size of the second anode material precursor particles in the reaction kettle 10, so as to control the particle size of the anode material precursor particles in the reaction kettle 10.
The first threshold value may be set as needed, and is generally associated with the target particle diameter of the cathode material precursor particles, for example, when the target particle diameter of the cathode material precursor particles is set to n μm, the first threshold value may be set to (n-2) μm.
The control module can control the particle size of the anode material precursor particles in the reaction kettle 10 by controlling the third interface 32, so that the crystal structures of the first anode material precursor particles and the second anode material precursor particles in the reaction kettle 10 are consistent, and the crystal structures of the inner layer and the outer layer of the same anode material precursor particles are also consistent, thereby being beneficial to preparing the anode material precursor with high crystallinity and excellent morphology.
According to some embodiments of the present application, the control module is further configured to control the first interface 22 to open when the size of the first positive electrode material precursor particles in the sanding apparatus 20 is less than or equal to a second threshold value.
The control module can also control the first interface 22, wherein the first interface 22 is an interface of the sanding device 20, which is communicated with the feeding device 30, and is used for transferring the first cathode material precursor particles obtained after sanding into the feeding device 30.
Specifically, the control module may obtain the size of the first positive electrode material precursor particles, such as the particle size of the particles, in the sanding device 20 at intervals. When the size of the first cathode material precursor particles is smaller than or equal to the second threshold, the first interface 22 is controlled to be opened, that is, after the particle size of the first cathode material precursor particles is sanded to a preset size, the control module may be configured to control the first interface 22 to be opened, so that the first cathode material precursor particles obtained after sanding are transferred to the feeding device 30.
Since the first interface 22 and the second interface 31 may refer to the same part of the apparatus for producing the cathode material precursor, the control module, when used for controlling the first interface 22, may also be regarded as being used for controlling the second interface 31.
During the sanding of the second positive material precursor particles by the sanding device 20, the control module may control the first interface 22 to close to avoid the particles that have not yet been sanded to a predetermined size from being erroneously transferred to the replenishing device 30.
The second threshold value may be set as needed, and for example, the D50 size of the first positive electrode material precursor particles may be set to 1.5 to 3 μm.
The control module can ensure the particle size of the first anode material precursor particles obtained after sanding in the sanding device 20 through controlling the first interface 22, thereby effectively controlling the particle size of the anode material precursor particles in the reaction kettle 10 in the subsequent production process and being beneficial to producing the anode material precursor with high crystallinity and excellent appearance.
While the invention has been described with reference to specific embodiments, the scope of the invention is not limited thereto, and those skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (12)
1. An apparatus for producing a precursor of a positive electrode material, comprising:
the reaction kettle is used for containing anode material precursor slurry, the anode material precursor slurry comprises a reaction solution and first anode material precursor particles, the first anode material precursor particles grow into second anode material precursor particles in the reaction solution, and the size of the second anode material precursor particles is larger than that of the first anode material precursor particles;
the sanding device is connected with the reaction kettle and is used for sanding the second anode material precursor particles to obtain a plurality of first anode material precursor particles;
and the material supplementing device is respectively connected with the reaction kettle and the sanding device and is used for adding the first anode material precursor particles obtained by the sanding device into the reaction kettle.
2. The apparatus of claim 1, wherein the sanding device includes a receiving cavity having a sanding material received therein that sands the second positive material precursor particles in the receiving cavity, and a first interface for communicating the sanding device with the replenishment material device.
3. The apparatus according to claim 2, wherein the sanding device includes a suction member having one end located below the liquid level of the positive-electrode-material precursor slurry and the other end communicating with the accommodating chamber, the suction member being configured to transfer the second positive-electrode-material precursor particles in the reaction vessel into the accommodating chamber.
4. The apparatus of claim 2, wherein the feeding device comprises a second interface and a third interface, the second interface is used for communicating the feeding device with the sanding device, and the third interface is used for communicating the feeding device with the reaction kettle.
5. The apparatus of claim 4, wherein the replenishing device further comprises a storage tank for storing the first positive electrode material precursor particles obtained by the sanding device, the second interface is used for the storage tank to obtain the first positive electrode material precursor particles from the sanding device, and the third interface is used for adding the first positive electrode material precursor particles in the storage tank into the reaction kettle.
6. The apparatus according to claim 5, wherein the storage tank is provided with a first stirring section for stirring the first positive electrode material precursor particles in the storage tank.
7. The apparatus of claim 4, wherein the feeding device further comprises a filter screen disposed at the third interface, such that the first cathode material precursor particles are fed into the reaction vessel through the filter screen for controlling a size of the first cathode material precursor particles fed into the reaction vessel.
8. The apparatus according to claim 1, wherein the reaction vessel is provided with a collection port for outputting the first and/or second cathode material precursor particles out of the reaction vessel when a liquid level of the cathode material precursor slurry is higher than or equal to the collection port.
9. The apparatus according to claim 1, wherein a second stirring portion and a flow baffle are disposed in the reaction kettle, the second stirring portion is configured to stir the positive electrode material precursor slurry in the reaction kettle, the flow baffle is disposed along an inner wall of the reaction kettle and distributed around the second stirring portion, and the flow baffle is configured to baffle the second stirring portion during stirring.
10. The apparatus according to claim 2, wherein the sanding device is provided with a third stirring section for stirring the sanding material and the second positive-electrode-material precursor particles in the housing chamber so that the second positive-electrode-material precursor particles are broken into a plurality of the first positive-electrode-material precursor particles upon collision with the sanding material.
11. The apparatus according to any one of claims 4 to 7, characterized in that it further comprises:
the control module is used for controlling the third interface to be opened when the size of the second anode material precursor particles in the reaction kettle is larger than or equal to a first threshold value.
12. The apparatus of claim 11, wherein the control module is further configured to control the first interface to open when the size of the first positive electrode material precursor particles in the sanding device is less than or equal to a second threshold.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116271942A (en) * | 2023-05-16 | 2023-06-23 | 河南牧锦生物科技有限公司 | Feed additive raw material mixing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116271942A (en) * | 2023-05-16 | 2023-06-23 | 河南牧锦生物科技有限公司 | Feed additive raw material mixing device |
| CN116271942B (en) * | 2023-05-16 | 2023-08-11 | 河南牧锦生物科技有限公司 | Feed additive raw material mixing device |
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