KR101760490B1 - Apparatus and method for manufacturing precursor - Google Patents

Apparatus and method for manufacturing precursor Download PDF

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KR101760490B1
KR101760490B1 KR1020150180840A KR20150180840A KR101760490B1 KR 101760490 B1 KR101760490 B1 KR 101760490B1 KR 1020150180840 A KR1020150180840 A KR 1020150180840A KR 20150180840 A KR20150180840 A KR 20150180840A KR 101760490 B1 KR101760490 B1 KR 101760490B1
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South Korea
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reactors
reactor
aqueous solution
storage tank
supplying
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KR1020150180840A
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Korean (ko)
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KR20170072549A (en
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고형신
김승일
김재한
황일규
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주식회사 포스코
재단법인 포항산업과학연구원
주식회사 포스코이에스엠
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/16—Making metallic powder or suspensions thereof using chemical processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/16—Making metallic powder or suspensions thereof using chemical processes
    • B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/16—Making metallic powder or suspensions thereof using chemical processes
    • B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
    • B22F9/24—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

A plurality of reactors for producing a precursor so that the production amount of the precursor can be effectively expanded while minimizing the structure of the equipment, a metal aqueous solution storage tank for storing the metal aqueous solution to be supplied to the reactor, A first metering pump for supplying the metering pump to at least two reactors, and a branching pipe connected between the first metering pump and each of the reactors, for separately supplying the metal aqueous solution to the respective reactors.

Description

[0001] APPARATUS AND METHOD FOR MANUFACTURING PRECURSOR [0002]

To a precursor producing apparatus and a manufacturing method for producing a precursor having a reactor.

For example, a technique using a batch or continuous type coprecipitation reactor is known as a method for continuously producing a ternary cathode precursor among cathode materials for a secondary battery.

In order to produce precursors that cause a continuous gradient of concentration in one precursor particle, a metal aqueous solution is used as the reactor. a pH adjusting agent and the like are required in order to supply the respective raw materials.

Each storage tank connected to one reactor is provided with a metering pump for supplying a raw material to the reactor in a predetermined amount.

Generally, in order to increase the production amount of the precursor, a method of securing a reaction space by increasing the volume of the reactor or increasing the number of the reactors is used.

However, when the number of reactors is increased to increase the production amount, it is necessary to equip the necessary equipment in accordance with the number of reactors, including a metering pump for quantitatively injecting raw materials into each reactor from a storage tank. Thus, the management tasks for each reactor are increased, and the physical properties of the precursors produced in the individual reactors are not uniform.

Further, when increasing the volume of the reactor by increasing the volume of the reactor, it is difficult to sufficiently increase the production amount due to various limitations such as the stirrer and the metering pump, and additional facility expansion is required.

Provided are a precursor manufacturing apparatus and a manufacturing method that can effectively expand the production amount of a precursor while minimizing the configuration of a facility.

Also provided is a precursor manufacturing apparatus and a manufacturing method which can produce a large amount of precursors having more stable and uniform physical properties.

The precursor producing apparatus of this embodiment includes a plurality of reactors for producing a precursor, a metal aqueous solution reservoir for storing a metal aqueous solution to be supplied to the reactor, a single aqueous solution reservoir provided in the metal aqueous solution reservoir for supplying the aqueous metal solution to at least two reactors A first metering pump, and a branch pipe connected between the first metering pump and each of the reactors, for separately supplying the metal aqueous solution to the respective reactors.

The manufacturing apparatus may further include a homogenizing unit connected between the plurality of reactors to circulate the reactants between the reactors.

The homogenizing unit may include a circulation pipe connecting the one reactor and the neighboring reactor, and a circulation pump installed at one side of the circulation tube and transferring the reactants of the one reactor to the neighboring reactor.

The homogenizing unit may further include a recirculation pipe connected to a reactor which branches from one side of the circulation tube and supplies the reactants through the circulation tube to return some of the reactants.

The manufacturing apparatus includes a control agent storage tank for storing a pH control agent supplied to the reactor, a single second metering pump installed in the adjusting agent storage tank for supplying a pH adjusting agent to at least two or more reactors, And separately supplying the pH adjusting agent to each of the reactors.

The manufacturing apparatus includes a chelating agent storage tank for storing the chelating agent supplied to the reactor, a single third metering pump installed in the chelating agent storage tank for supplying the chelating agent to at least two reactors, And a branch pipe connected between the pump and each of the reactors to individually supply the chelating agent to each of the reactors.

At least one fourth metering pump installed in at least one or more of the controlled material storage tanks for supplying the composition control material to the metal aqueous solution storage tank, And a supply pipe connected between the aqueous solution storage tank and supplying the composition control material to the metal aqueous solution storage tank.

The method for producing a precursor of this embodiment includes the steps of supplying a raw material to a plurality of reactors and rotationally driving each of the reactors to produce a concentration gradient type precursor,

The step of supplying the raw material may include a step of transferring the aqueous metal solution from one metal aqueous solution storage tank storing the metal aqueous solution supplied to the reactor and branching the at least two reactors.

The step of supplying the raw material may further include feeding the pH adjusting agent from one adjusting agent storage tank, which is supplied with the pH adjusting agent supplied to the reactor, to branch at least into two or more reactors.

The step of supplying the raw material may include feeding the chelating agent from one chelating agent storage tank to which the chelating agent supplied to the reactor is transferred and branching it to at least two or more reactors.

In the step of supplying the raw material, the composition control material may be transferred from the at least one control material storage tank storing the composition control material supplied to the metal aqueous solution storage tank and supplied to the metal aqueous solution storage tank.

The manufacturing method may further include a homogenization step of circulating the reactants between the plurality of reactors.

The homogenization step may include transferring the reactants from one reactor to an adjacent reactor and circulating the reactants.

The homogenization may further include a recirculation step of returning some of the reactants circulating from one reactor to the adjacent reactor to the one reactor.

As described above, according to this embodiment, since the storage tank or the metering pump is not separately provided in each of the plurality of reactors, the production amount of the precursor can be effectively increased while minimizing the structure of the equipment.

In addition, by homogenizing the reactants produced in a plurality of reactors, a precursor having more stable and uniform physical properties can be mass-produced.

1 is a schematic view showing a precursor producing apparatus according to this embodiment.
2 is a SEM photograph of a precursor for a lithium secondary battery manufactured according to this embodiment and a comparative example.
FIG. 3 is a graph showing the results of measuring the particle size of the precursor for a lithium secondary battery according to the present invention and Comparative Example, according to reaction time.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified, and that other specific features, regions, integers, steps, operations, elements, components, and / And the like.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Accordingly, the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

1 shows a production apparatus for producing a precursor according to this embodiment.

As shown in FIG. 1, the manufacturing apparatus 100 of the present embodiment includes a reactor 10 for producing a precursor through a coprecipitation reaction with an agitator rotated by a driving force of a driving motor, And a metal aqueous solution storage tank 20 for supplying the metal aqueous solution to the metal solution storage tank 20.

The manufacturing apparatus may further include a control agent storage tank 30 for supplying a pH adjusting agent into the reactor 10 or a chelating agent storage tank 40 for supplying a chelating agent to the reactor 10, And a regulating substance storage tank 50 for supplying the regulated substances.

The reactor 10, for example, coprecipitates the raw material fed into the cylinder by the coprecipitation reactor 10 to continuously produce a concentration gradient of the metal composition from the center of the particles to produce a precursor.

In order to produce precursors that cause a continuous concentration gradient in one precursor particle, a different aqueous metal solution is required. In FIG. 1, only one metal solution storage tank 20 and a control substance storage tank 50 are shown. However, the control solution storage tank may include at least one or more metal aqueous solutions having different compositions. In the following description, a structure in which only one metal aqueous solution reservoir and a control material reservoir are provided will be described as an example.

For example, the manufacturing apparatus can produce a cathode precursor for a cathode material of a secondary battery using a rotating flow of the reactor 10.

In the present embodiment, a plurality of reactors 10 for producing the precursor are provided, and a plurality of reactors 10 are connected in parallel with a single metal-aqueous solution storage tank 20. Thus, the metal aqueous solution is supplied to the plurality of reactors (10) from one metal aqueous solution storage tank (20).

The manufacturing apparatus is provided with at least two reactors 10 installed in the metal aqueous solution storage tank 20 for supplying the metal aqueous solution from the single metal aqueous solution storage tank 20 to the plurality of reactors 10, And a branch pipe 24 which is connected between the first metering pump and each of the reactors 10 and separately supplies the metal aqueous solution to each of the reactors 10. The first metering pump 22,

1, in the present embodiment, three reactors 10 are connected to one metal aqueous solution storage tank 20 so that three branch pipes 24 from one first dosing pump 22 So that the metal aqueous solution is supplied to each reactor 10 separately. The present manufacturing apparatus is not limited to the structure of FIG. 1, and a structure in which two reactors are installed in one metering pump or a structure in which four or more reactors are installed in one metering pump can also be set.

The apparatus of the present embodiment is characterized in that a plurality of reactors 10 are connected in parallel to one metal aqueous solution storage tank 20 to supply a metal aqueous solution so that a small- Several reactors 10 can be used. Thus, in the case of the present embodiment, it is possible to use a small-sized reactor 10 in which a single large-sized reactor 10 can be easily secured and controlled instead of a single large-sized reactor 10.

A single first metering pump 22 is provided in the metal aqueous solution storage tank 20 and a plurality of branch pipes 24 are connected to the outlet of the first metering pump so that the metal supplied from the first metering pump 22 The aqueous solution is divided into the respective reactors 10 via a plurality of branch pipes 24 and supplied.

The metal aqueous solution supplied from the first metering pump 22 needs to be dividedly supplied to each branch pipe 24 in the same amount. The first metering pump can be applied as long as the metal aqueous solution can be quantitatively divided and branched. For example, the first metering pump may have a structure in which a plurality of pump heads of the same size are installed on one rotary shaft corresponding to the number of the reactors. Accordingly, the plurality of pump heads provided on the rotary shaft move together, and the same amount of metal aqueous solution can be branched into a plurality of reactors.

As described above, even when the number of reactors is increased by providing a metal aqueous solution storage tank 20 for a plurality of reactors 10, the metal aqueous solution is divided and supplied in a fixed amount so that the number of the reactors, including the metering pump, And it is not necessary to manage the equipment for each of the reactors.

The manufacturing apparatus of this embodiment includes a regulator storage tank 30 in which a pH regulator is stored, and a plurality of reactors 10 are connected in parallel with a single regulator storage tank 30. Thus, the pH adjuster is supplied from the one adjuster storage tank 30 to the plurality of reactors 10.

The manufacturing apparatus includes a plurality of reactors 10 provided in the adjusting agent storage tank 30 for supplying a pH adjusting agent to the plurality of reactors 10 from a single adjusting agent storage tank 30, And a branch pipe 34 connected between the second metering pump and each of the reactors 10 to individually supply the pH adjuster to each of the reactors 10.

The second dosing pump 32 has a structure similar to that of the first dosing pump 22 described above, and divides the supplied amount of the pH adjusting agent quantitatively into the respective reactors 10.

As described above, the plurality of reactors 10 are connected in parallel to one adjuster storage tank 30 to supply the pH adjusting agent, so that the management of each reactor 10 is unnecessary And mass production of the precursor using the reactor 10 of a small to medium scale can be achieved.

The manufacturing apparatus of the present embodiment includes a chelating agent storage tank 40 supplied with a chelating agent supplied to the reactor 10 for agglomeration, and a plurality of the reactors 10 are connected to a single chelating agent storage tank 40 And are connected in parallel. Thus, the chelating agent is supplied from the one chelating agent storage tank 40 to the plurality of the reactors 10.

The manufacturing apparatus is provided in the chelating agent storage tank 40 for supplying the chelating agent from the single chelating agent storage tank 40 to the plurality of reactors 10, And a branch pipe 44 which is connected between the third metering pump and each of the reactors 10 and separately supplies the chelating agent to the respective reactors 10 do.

The third metering pump 42 has the same structure as the first metering pump 22 described above and quantitatively divides the chelating agent and branches it to each of the reactors 10.

As described above, the plurality of the reactors 10 are connected in parallel to the one chelating agent storage tank 40 to supply the chelating agent. Thus, The precursor can be mass-produced using the reactor 10 of a small to medium size.

The manufacturing apparatus of this embodiment includes a control substance storage tank 50 in which a composition control substance for controlling the composition is stored, and is connected in series to the metal aqueous solution storage tank 20 to supply a composition control substance to the reactor 10, . One or more control material reservoirs 50 may be connected to the metal aqueous reservoir.

The manufacturing apparatus may be configured to connect the controlled substance storage tank 50 and the metal aqueous solution storage tank 20 in order to supply the composition control substance from the at least one controlled substance storage tank 50 to the metal aqueous solution storage tank 20 And at least one fourth metering pump (52) installed in the supply pipe (54) for supplying the composition control material to the metal aqueous solution storage tank (20).

As described above, by supplying a plurality of reactors 10 in parallel from one metal aqueous solution storage tank 20 connected to one or more controlled substance storage tanks 50 to supply the composition control substances, So that the management of each reactor 10 is unnecessary, and mass production of precursors using the reactor 10 of a small and medium scale can be achieved.

Therefore, it is possible to mass-produce a large number of precursors while simplifying the structure of the equipment by branching the raw materials into a plurality of reactors by using only one metering pump for each raw material storage tank, .

The manufacturing apparatus further includes a homogenizing unit connected between the plurality of reactors (10) to circulate the reactants between the reactors (10). In the manufacturing apparatus, the reactants produced in the respective reactors 10 are homogenized with the same physical properties by mixing the reactants by the homogenizer.

1, the homogenizer includes a circulation pipe 62 for connecting a lower portion of the reactor 10 to an upper portion of the reactor 10 adjacent to the reactor 10, a reactor 10 installed at one side of the circulation pipe 62, ) To the adjacent reactor (10).

The homogenizing unit further includes a recycle pipe 64 branched from one side of the circulation pipe 62 and connected to the upper part of the reactor 10 for supplying the reactant through the circulation pipe 62 to return some of the reactants.

The circulation pipe (62) extends from the lower portion of the one reactor (10) to an upper portion of the adjacent reactor (10). A circulation pump (60) is installed on one side of the circulation pipe (62). When the circulation pump 60 is driven, the reactants generated in the one-side reactor 10 are introduced into the neighboring reactor 10 through the circulation pipe 62 and mixed with the reactants in the neighboring reactor 10.

As described above, the respective reactors 10 are connected to each other through the homogenizer, and the reactants of the respective reactors 10 generated at the same time are circulated and homogenized among the reactors 10. Therefore, the reactants produced in each reactor 10 exhibit the same physical properties as the precursors produced by applying the single reactor 10 at the end of the reaction. As a result, precursors having the same physical properties throughout the plurality of reactors 10 can be stably produced as many times as the number of the reactors 10.

In addition to the transfer structure by the circulation pump, the reactants may overflow from one side of the reactor to the neighboring reactor and move and mix with each other. This structure is also homogenized by mixing the reactants between the reactors.

Hereinafter, a process of manufacturing the cathode precursor from the above apparatus will be described.

In the preparation of the precursor of this embodiment, a raw material containing an aqueous metal solution is supplied to a plurality of reactors, and each of the reactors is rotationally driven to produce a concentration gradient type precursor.

The feeding of the raw material may include feeding the aqueous metal solution from the metallic aqueous solution storage tank storing the metallic aqueous solution supplied to the reactor, and branching the fed aqueous solution into at least two reactors.

Thus, by branching the raw material and supplying it to a plurality of reactors, a large amount of precursors can be mass-produced from a plurality of reactors.

In this embodiment, a pH adjusting agent for adjusting the pH of the coprecipitation reaction, a chelating agent for agglomeration, or a composition controlling substance may be further supplied to the inside of the reactor.

For this purpose, the step of supplying the raw material may further include feeding the pH adjusting agent from the adjusting agent storage tank stored in the pH adjusting agent supplied to the reactor, and supplying the pH adjusting agent to at least two or more reactors.

In addition, the raw material supplying step may include feeding the chelating agent from the chelating agent storage tank, which is supplied from the chelating agent supplied to the reactor, to the at least two or more reactors.

In addition, the step of supplying the raw material may include a step of feeding the composition control material from the at least one control material storage tank storing the composition control material supplied to the reactor to the metal aqueous solution storage tank.

Each raw material is branched into a plurality of reactors in each of a single metal aqueous solution storage tank, a control agent storage tank, and a chelating agent storage tank. In each reactor, a precursor is produced through a coprecipitation reaction.

The coprecipitation reaction refers to the simultaneous precipitation of various different ions into an aqueous solution or a non-aqueous solution. For example, two or three elements are simultaneously precipitated in an aqueous solution using a neutralization reaction to obtain a precursor in the form of hydroxide or oxide, and this precursor is mixed with lithium hydroxide and fired.

The manufacturing method of the present embodiment further includes a homogenization step of circulating a reactant between a plurality of reactors in a precursor manufacturing process.

The homogenization step includes transferring and circulating the reactants from one reactor to an adjacent reactor. The homogenization may further include a recycling step of returning some of the reactants circulating from one reactor to the adjacent reactor to the one reactor.

The reactants produced in one reactor are transferred to the adjacent reactor by a circulation pump, and the reactants produced in the plurality of reactors are exchanged and mixed. Thus, the reactants contained in each of the reactors have the same physical properties that are homogenized by mixing with each other. As described above, the reactants are circulated or overflowed and mixed in each reaction period and homogenized with each other, so that even when the precursors are produced through a plurality of reactors, precursors having the same physical properties can be manufactured in large quantities.

[Example]

As an example, a cathode active material particle for a lithium secondary battery was produced by using the production apparatus shown in Fig. In Example 1, the average overall composition of the particles was Ni 0 . 6 Mn 0 . 2 Co 0 .2 (OH) 2 , and Example 2 is a positive electrode active material particle having an average particle composition of Ni 0 . 8 Mn 0 . 1 Co 0 .1 (OH) is a positive electrode active material particle is represented by 2.

[Comparative Example]

As a comparative example, cathode active material particles for a lithium secondary battery were produced using a conventional single reactor. Comparative Example 1 is a positive electrode active material particle having an average particle composition of Ni 0.6 Mn 0.2 Co 0.2 (OH) 2 , and Comparative Example 2 is an anode active material particle having an average particle composition of Ni 0.8 Mn 0.1 Co 0.1 (OH) 2 Active material particles.

[Production of cathode active material particle]

A metal mixed solution having the same composition as shown in Table 1 below was fed in the same manner as in the metal aqueous solution storage tank and the controlled material storage tank in both Examples and Comparative Examples, and a precursor for a lithium secondary battery was prepared using the reactor. In the case of the embodiment, as described above, the metering pump and the circulation pump were driven to supply a metal mixed solution to each reactor to prepare a precursor. As a comparative example, a precursor was prepared by supplying a metal mixed solution to a single reactor as in the prior art.

Item Metal aqueous solution composition, mol% Metal aqueous solution storage tank Controlled substance storage tank Ni Co Mn Ni Co Mn Example 1 80 10 10 40 30 30 Example 2 95 5 0 65 15 20 Comparative Example 1 80 10 10 40 30 30 Comparative Example 2 95 5 0 65 15 20

[Experimental Example 1]

SEM photographs of the precursors for lithium secondary batteries prepared in Examples and Comparative Examples were measured and the results were compared. As shown in FIG. 2, it can be confirmed that the particle size distribution is uniform in the examples as compared with the comparative example.

Table 2 below shows the results of measuring the reaction time, final particle size, filling density and yield of the lithium secondary battery precursors prepared in Examples and Comparative Examples.

Item Reaction time Particle size (D50)
㎛ Filling density
g / cc output
kg / batch Example 1 24 12.9 2.17 29.6 Example 2 24 13.3 2.27 28.9 Comparative Example 1 24 13.0 2.19 10.1 Comparative Example 2 24 13.1 2.22 9.9

As shown in Table 2, in the examples, the production amount is much higher than that in the comparative example, and it can be confirmed that mass production in the case of this embodiment is possible.

[Experimental Example 2]

The particle sizes of the precursors for lithium secondary batteries prepared in Examples and Comparative Examples were measured according to the reaction time, and Fig. 3 shows the results. As shown in FIG. 3, even when manufactured according to the embodiment, it can be confirmed that the growth rate is similar to the comparative example without deteriorating.

While the illustrative embodiments of the present invention have been shown and described, various modifications and alternative embodiments may be made by those skilled in the art. Such variations and other embodiments will be considered and included in the appended claims, all without departing from the true spirit and scope of the invention.

10: Reactor 20: Metal aqueous solution storage tank
22: first metering pump 24, 34, 44, 54:
30: Controlling agent storage tank 40: Chelating agent storage tank
50: Control material storage tank 60: circulation pump
62: circulation tube 64: recirculation tube

Claims (14)

A plurality of reactors for producing a precursor, a metal aqueous solution reservoir storing metal aqueous solution supplied to the reactor, a single first metering pump installed in the metal aqueous solution storage tank for supplying the metal aqueous solution to at least two or more reactors, And a homogenizing unit connected between the pump and each of the reactors to separately supply the aqueous metal solution to the reactors, and a homogenizer connected between the plurality of reactors to circulate the reactants between the reactors,
Each of the reactors is connected in parallel to a metal aqueous solution reservoir and is supplied with a metal aqueous solution from a metal aqueous solution reservoir through a first metering pump and a branch,
The homogenizing unit includes a circulation pipe for connecting one of the reactors and the neighboring reactors, a circulation pump installed at one side of the circulation pipe for transferring the reactants of the one reaction chamber to the neighboring reactors, And a re-circulation tube connected to the reactor for supplying a portion of the reactant and returning a part of the reactant. The method according to claim 1,
A pH adjusting agent supplied to the reactor; a single second metering pump installed in the adjusting agent storage tank to supply a pH adjusting agent to at least two or more reactors; and a second metering pump connected between the second metering pump and each of the reactors, And a branch pipe for separately feeding the regulator into each reactor. The method according to claim 1,
A single third metering pump installed in the chelating agent storage tank for supplying a chelating agent to at least two or more reactors, and a third metering pump installed in the chelating agent storage tank for supplying the chelating agent to the reactor, And a branching pipe connected between the plurality of reactors and separately feeding the chelating agent to each of the reactors. The method according to claim 1,
At least one fourth metering pump installed in at least one or more of the controlled material storage tanks for supplying the composition control material to the metal aqueous solution storage tank, And a supply pipe connected between the aqueous solution storage tank and supplying the composition control material to the metal aqueous solution storage tank. delete delete delete The method comprising: supplying a raw material to a plurality of reactors; and rotating the respective reactors to produce a concentration gradient type precursor, wherein the raw material supplying step is a step of supplying a raw material to the plurality of reactors in parallel with one metal aqueous solution storage tank A step of branching and supplying the aqueous metal solution into at least two reactors, and a homogenization step of circulating the reactants between the plurality of reactors,
Wherein the homogenizing step comprises transferring and circulating the reactants from one reactor to an adjacent reactor and a recirculation step of returning some of the reactants circulating from the one reactor to the neighboring reactor to the one reactor. 9. The method of claim 8,
Wherein the step of supplying the raw material further comprises the step of feeding the pH adjuster branched from at least one reservoir containing the pH adjuster supplied to the reactor to at least two reactors. 9. The method of claim 8,
Wherein the feedstock comprises branching and feeding the chelating agent to at least two reactors from one chelating agent storage tank where the chelating agent is fed to the reactor. 9. The method of claim 8,
Wherein the step of supplying the raw material comprises the step of feeding the composition control material from at least one or more control material storage tanks storing the composition control material supplied to the metal aqueous solution storage tank to the metal aqueous solution storage tank. delete delete delete
KR1020150180840A 2015-12-17 2015-12-17 Apparatus and method for manufacturing precursor KR101760490B1 (en)

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