JP2010182485A - Method and device for manufacturing slurry for electrode - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and device for manufacturing slurry for an electrode preventing the degradation of characteristics due to mixing in of moisture in steps from kneading to storing. <P>SOLUTION: The method of manufacturing slurry SC for an electrode containing active material particles SX and resin SY includes a stirring step of making up dispersion slurry SC with the active material particles and the resin dispersed from each other by stirring, and a flowing storage step of flowing the dispersion slurry up to a storage part 103 to store it. Whichever site PS2 the dispersion slurry is to exist, the stirring step and the flowing storage step are to be carried out with a slurry temperature TS of the dispersion slurry and a member temperature TT of a member 110B for the dispersion slurry to be in contact with set higher than a dew-point temperature TG of an atmosphere PS2G at the site PS2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for producing an electrode slurry used for an active material layer of a battery, and an electrode slurry producing apparatus for producing the same.

In recent years, secondary batteries have been used as power sources for driving portable electronic devices such as hybrid vehicles, notebook computers, and video camcorders.
In manufacturing an electrode used for such a secondary battery, Patent Document 1 discloses that when a slurry composed of an active material (active material particles), a conductive agent, a binder (resin), and an organic solvent (solvent) is wet-kneaded. In addition, there is a technique performed in an air, nitrogen gas or noble gas atmosphere having a moisture dew point of −20 ° C. or lower. When wet kneading is performed in such an atmosphere, the occurrence of a decomposition reaction of the active material due to water mixing during kneading can be suppressed.

International Publication Number WO 98/54774

  However, in the electrode manufacturing method described in Patent Document 1, the mixing of moisture at the time of kneading is described, but there is no description about the case where the kneaded slurry is fluidized and stored in a container or the like. However, even when water is mixed into the kneaded slurry, the characteristics of the slurry (or the electrode using the same) may be reduced due to water mixing, such as decomposition of the active material by water or solidification of the binder. There is. In particular, when the kneading equipment, the container, and the members forming the flow path are cooled in order to cool the slurry heated at the time of kneading or after kneading, condensation tends to occur and moisture is mixed into the slurry, causing decomposition reactions and Problems such as solidification are likely to occur.

  The present invention has been made in view of such problems, and provides a method for producing a slurry for an electrode that prevents degradation of characteristics due to moisture mixing such as decomposition reaction and solidification due to moisture mixing from kneading to storage. With the goal. Moreover, it aims at providing the manufacturing apparatus of the slurry for electrodes which can prevent the characteristic fall of the slurry by a water | moisture content.

  The solution is a method for producing a slurry for an electrode comprising a solvent, active material particles, and a resin dissolved in the solvent, wherein the active material particles and the resin are dispersed with each other by stirring. And the fluid storage step of allowing the stirred dispersion slurry to flow to the storage portion and storing in the storage portion, wherein the dispersion slurry is present in the stirring step and the fluid storage step. At any place, the slurry temperature of the dispersion slurry and the member temperature of the member in contact with the dispersion slurry are set to be higher than the dew point temperature of the atmosphere in contact with the dispersion slurry at this place. It is a manufacturing method of the slurry for electrodes.

  In the manufacturing method of the slurry for electrodes of the present invention, the temperature of the dispersion slurry and the member in contact with the dispersion slurry is provided in any of the places where the dispersion slurry is present, including the stirring step and the flow storage step. The stirring step and the flow storage step are performed in a state higher than the dew point temperature of the atmosphere (hereinafter also simply referred to as dew point). For this reason, in any place where the dispersed slurry is present, condensation can be prevented and the stirring step and the flow storage step can be performed. Therefore, it is possible to prevent problems due to moisture mixing such as decomposition reaction and solidification caused by mixing of moisture due to condensation into the dispersed slurry, and to manufacture a slurry for electrodes having good characteristics.

Examples of the active material particles include positive electrode active materials such as LiNiO ₂ , LiCoO ₂ , and LiNiCoMnO ₂ , and negative electrode active materials such as graphite particles and low crystalline carbon. Examples of the resin include polyvinylidene fluoride (PVDF), polyimide, and an acrylic binder. Examples of the solvent include N-methyl-2-pyrrolidone (NMP), ethyl alcohol, acetone, methyl ethyl ketone, and the like.

The stirring method may be any method as long as the active material particles and the resin dissolved in the solvent are dispersed in the solvent in the slurry. For example, T.A. K. A method by fill mix is mentioned. In addition, in the flow storage process, when the stirred dispersion slurry flows to the storage section, the dispersion slurry may be in contact with the outside air (indoor air) (open air). It is not necessary to form a closed space where the roads, storage containers, and the like are closed to communicate with the outside air (closed air).
Further, as the electrode slurry, the dispersed slurry may be used as it is, or another substance may be added or processed.

  Furthermore, it is a manufacturing method of the above-mentioned electrode slurry, The said fluid storage process is good to set it as the manufacturing method of the slurry for electrodes including the cooling process cooled while making the said dispersion | distribution slurry flow.

In the stirring step, the temperature of the slurry may increase when the active material particles and the resin are dispersed. In this way, in the dispersion slurry that has become high temperature, the resin is denatured by heat and solidification proceeds, which may deteriorate the characteristics of the electrode slurry. It is not preferable.
On the other hand, in the manufacturing method of the slurry for electrodes of this invention, a fluid storage process has a cooling process. For this reason, this can be cooled at the time of distribution of a dispersion slurry. Therefore, it is possible to produce an electrode slurry that prevents not only the mixing of moisture but also deterioration of characteristics due to high temperature.

  Further, in any one of the above-described methods for producing an electrode slurry, the dry air is circulated over the entire flow path through which the dispersed slurry flows prior to the flow storage step. Of these, a method for producing a slurry for an electrode comprising a drying step of drying at least a portion in contact with the dispersion slurry is preferable.

  In the manufacturing method of the slurry for electrodes of this invention, the above-mentioned drying process is provided. For this reason, it is possible to prevent the moisture adhering to at least the portion in contact with the dispersed slurry among the members forming the flow path from being mixed into the dispersed slurry.

  Furthermore, in the method for manufacturing the electrode slurry described above, the drying step is for the electrode through which the dry air is circulated until an atmospheric dew point temperature of the atmosphere in the flow path located in the flow path becomes a predetermined value or less. A method for producing a slurry is preferable.

  In the manufacturing method of the slurry for electrodes of the present invention, dry air is circulated until the atmospheric dew point becomes a predetermined value or less. For this reason, the dew condensation in a flow path can be prevented reliably.

  Furthermore, in the method for producing the electrode slurry, the drying step is performed by closing the valve with a dew point meter connected to the flow path via a valve that opens and closes the circulation of the atmosphere in the flow path. A method for producing a slurry for an electrode that measures the atmospheric dew point temperature is preferable.

When measuring the dew point of the atmosphere in the flow path with a dew point meter, it is more stable to measure the dew point when the flow path atmosphere does not move around the dew point meter than to measure with the dry air circulating. To measure the atmospheric dew point.
Based on this knowledge, in the method for producing an electrode slurry of the present invention, a valve is provided between the flow path and the dew point meter, and a dew point meter connected to the flow path is connected through this valve, and the valve is closed. Since the atmospheric dew point is measured, the atmospheric dew point can be measured more stably.

  Further, another solution is an apparatus for producing a slurry for an electrode comprising a solvent, active material particles, and a resin dissolved in the solvent, wherein the pretreatment slurry containing the solvent, the active material particles, and the resin is stirred. And a stirring means for forming a dispersion slurry in which the active material particles and the resin are dispersed, and a flow path member that forms a flow path for causing the dispersion slurry to flow and leading from the stirring means to the storage section. The stirring means and the flow path member are configured so that the slurry temperature of the dispersion slurry in the place and the member temperature of the member in contact with the dispersion slurry are determined at any place where the dispersion slurry exists. Is a device for producing a slurry for electrodes that is higher than the dew point temperature of the atmosphere in contact with the dispersed slurry.

  In the apparatus for producing an electrode slurry of the present invention, the temperature of the dispersed slurry and the member in contact with the dispersed slurry is set to the dew point of the atmosphere at any location where the dispersed slurry exists among the stirring means and the flow path member. Can be higher than temperature. For this reason, dew condensation can be prevented at any place where the dispersed slurry exists in the stirring means and the flow path member. Therefore, according to this apparatus, it is possible to prevent deterioration of characteristics due to water mixing such as decomposition reaction and solidification due to water mixing, and to manufacture an electrode slurry having good characteristics.

  Furthermore, in the above-described electrode slurry manufacturing apparatus, the flow path member may be an electrode slurry manufacturing apparatus having cooling means for cooling the dispersed slurry while flowing.

  In the electrode slurry manufacturing apparatus of the present invention, the flow path member has a cooling means. For this reason, when the dispersed slurry flows through the flow path member, the dispersed slurry can be cooled using the cooling means. Therefore, according to this apparatus, it is possible not only to prevent moisture from being mixed, but also to prevent deterioration of characteristics due to high temperature, and to manufacture an electrode slurry having good characteristics.

  Furthermore, it is preferable that the electrode slurry manufacturing apparatus is any one of the above-described electrode slurry manufacturing apparatuses including dry air circulation means for circulating dry air over the entire flow path.

  The electrode slurry manufacturing apparatus of the present invention includes the above-described dry air circulation means. For this reason, prior to flowing the dispersed slurry, it can be dried over the entire flow path using this dry air circulation means. Further, at least the dew point of the atmosphere in contact with the dispersed slurry in the flow path can be lowered to prevent condensation in the flow path.

  Furthermore, it is preferable to use the above-described electrode slurry manufacturing apparatus, which is an electrode slurry manufacturing apparatus including a dew point meter that measures the atmospheric dew point temperature of the atmosphere in the flow path located in the flow path.

  The electrode slurry manufacturing apparatus of the present invention includes a dew point meter. For this reason, for example, dry air is circulated through the flow path member until the atmosphere in the flow path becomes equal to or less than a predetermined value that does not cause condensation even when the dispersed slurry or the flow path member is touched. Appropriate dew point management is possible, such as lowering the dew point. Thus, it is possible to reliably prevent condensation in the flow path.

  Further, in the electrode slurry manufacturing apparatus described above, the dew point meter is an electrode slurry manufacturing apparatus that is connected to the flow path via a valve that opens and closes the flow of the atmosphere in the flow path. good.

  In the electrode slurry manufacturing apparatus of the present invention, since the dew point meter is connected to the flow path via the above-described valve, the valve is opened before the dew point is measured, and the valve is closed during the measurement. The atmospheric dew point of the road atmosphere can be stably measured.

It is explanatory drawing of the manufacturing apparatus concerning Embodiment 1. FIG. 3 is an explanatory diagram of a filter unit according to Embodiment 1. FIG. It is a fragmentary sectional view (A section of Drawing 1) of a manufacturing device concerning Embodiment 1.

(Embodiment 1)
Next, Embodiment 1 of the present invention will be described with reference to the drawings.
The manufacturing method 100 of the positive electrode plate slurry SC and the positive electrode plate slurry SC according to the first embodiment will be described. The positive electrode plate slurry SC forms an active material layer of the positive electrode plate of the battery when applied to the positive electrode substrate and dried.

First, the manufacturing apparatus 100 of the positive electrode slurry SC according to the first embodiment will be described with reference to FIGS.
The manufacturing apparatus 100 includes a stirring tank 102, a second flow path member 110B, a dry air supply mechanism 150, and a dew point measurement mechanism 140. In addition to these, a supply tank 101, a first flow path member 110A, a filter unit 111, and a storage tank 103 are provided. In the manufacturing apparatus 100, the first flow path member 110A connects the lower side (lower part in FIG. 1) of the supply tank 101 and the upper side (upper side in FIG. 1) of the stirring tank 102, and the second flow path member The member 110B is connected to the lower side (lower side in FIG. 1) of the stirring tank 102. And the storage tank 103 is arrange | positioned under the outflow port 110BE which is located in the front-end | tip of the 2nd flow path member 110B and faces below in FIG. Further, a dry air supply mechanism 150, a dew point measurement mechanism 140, and a filter unit 111 are connected to each other in the middle of the second flow path member 110B.
In the manufacturing apparatus 100, the supply tank 101, the first flow path member 110A, the stirring tank 102, the second flow path member 110B, the dry air supply mechanism 150, the dew point measurement mechanism 140, and the filter unit 111 are closed spaces (closed). Air).

Among these, the supply tank 101 is a cylindrical container which can accommodate a thing (refer FIG. 1). The pretreatment slurry SB in which the positive electrode active material SX, the binder SY dissolved in the solvent SW, and the conductive additive SZ are not dispersed is housed inside.
The tubular first flow path member 110A includes a first flow path PS1 therein (see FIG. 1). In addition, the liquid feed pump 170 is arrange | positioned at 110 A of 1st flow path members, A fluid can be made to flow into 1st flow path PS1 using this.

Moreover, the storage tank 103 is a cylindrical container which can accommodate a thing (refer FIG. 1). The storage tank 103 includes a propeller-shaped stirring splash 103W capable of stirring the contents therein.
Further, as shown in FIG. 2, the filter unit 111 includes a disk mesh-shaped mesh filter unit 111A, a spatula-shaped scraper unit 111B that rubs the mesh filter unit 111A while rotating in a circle, and a filter case 111R. It has a rotating shaft part 111C that rotates the scraper part 111B in a circle. This filter part 111 is arrange | positioned before the outflow port 110BE which flows out a fluid into the storage tank 103 among the 2nd flow path members 110B.

  In addition, a stirring tank 102 of a cylindrical container that can once accommodate a fluid therein is manufactured by T.I. K. It is a fill mix. The stirring tank 102 includes a propeller-shaped stirring spring 102W that stirs the fluid in the tank inside PST of the stirring tank 102, and a motor unit 102M that rotates the stirring spring 102W (see FIG. 1). Among these, the stirring splash 102W stirs the contents with a large shearing force.

Further, the stirring tank 102 includes the first cooling mechanism 120 capable of cooling the stirring tank 102 itself and the fluid once stored in the stirring tank 102.
The first cooling mechanism 120 includes a main body part 120A including a pump (not shown) that sends out a refrigerant (not shown), a tubular first refrigerant pipe part 120B and a second refrigerant pipe part 120D connected to the main body part 120A, And a metal tubular spiral pipe portion 120C that spirally surrounds the outside of the stirring tank 102 (see FIG. 1). The refrigerant flows from the main body part 120A through the first refrigerant pipe part 120B and cools the agitation tank 102 while passing through the spiral pipe part 120C. The refrigerant that has passed through the spiral pipe portion 120C flows through the second refrigerant pipe portion 120D and returns to the main body portion 120A.

  The tubular second flow path member 110B includes the second flow path PS2 therein. The second flow path member 110B spirally surrounds the first branch part 110BP and the second branch part 110BQ branched from the second flow path PS2 and the cooler 130C of the second cooling mechanism 130 described below. And a metal tubular spiral portion 110BZ.

Further, the second flow path member 110B includes a second cooling mechanism 130 that can cool the second flow path member 110B itself and a fluid flowing in the second flow path member 110B.
The second cooling mechanism 130 includes a main body portion 130A including a pump (not shown) that sends out a refrigerant (not shown), a tubular first refrigerant piping portion 130B and a second refrigerant piping portion 130D connected to the main body portion 130A, And a cylindrical cooler 130C made of metal and capable of circulating a refrigerant therein. The refrigerant flows through the first refrigerant pipe portion 130B from the main body portion 130A and cools the spiral portion 110BZ of the second flow path member 110B when passing through the cooler 130C. And the refrigerant | coolant which circulated through the cooler 130C flows through the 2nd refrigerant | coolant piping part 130D, and returns to 130 A of main body parts.

  The dry air supply mechanism 150 includes a dry air supply unit 151 that can supply dry air DA, a tubular dry air pipe 152 that connects the dry air supply unit 151 and the first branch portion 110BP of the second flow path member 110B, and The dry air pipe 152 has a valve 153 that can be opened and closed.

  Further, the dew point measuring means 140 includes a dew point meter 141, a tubular measurement pipe 142 connecting the dew point meter 141 and the second branch part 110BQ of the second flow path member 110B, and the measurement pipe 142. Has a valve 143 that can be opened and closed.

  In addition, since it is closed air from the supply tank 101 to 2nd flow path PS2, the dew point of the atmosphere of 1st flow path PS1, the stirring tank 102, and 2nd flow path PS2 is uniform. Therefore, if the dew point of the flow path atmosphere PS2G is measured by the dew point meter 141, it can be regarded as the dew point of the place (the stirring tank 102 and the second flow path PS2) where the positive electrode plate slurry SC is present.

Moreover, in the manufacturing apparatus 100 of the first embodiment, the dry-air supply mechanism 150 and the dew point meter 140 are used to measure the tank temperature TF of the stirring tank 102 and the member temperature TT of the second flow path member 110B. The atmospheric dew point TG of PS2G is set higher.
Specifically, in the manufacturing apparatus 100, a dew point predetermined value TK is provided for the atmospheric dew point TG. When the atmospheric dew point TG is equal to or less than the predetermined value TK, the tank temperature TF of the stirring tank 102 and the member temperature TT of the second flow path member 110B are equal even if the first cooling mechanism 120 and the second cooling mechanism 130 are used. The predetermined value TK is determined so as not to be lower than the atmospheric dew point TG. That is, in the manufacturing apparatus 100, (tank temperature TF, member temperature TT)> predetermined value TK ≧ atmosphere dew point TG is established. If the atmospheric dew point TG is higher than the predetermined value TK of the dew point, the atmospheric dew point TG is set to be equal to or lower than the predetermined value TK using the dry air supply mechanism 150.

  Moreover, the slurry SC for positive electrode plates of this Embodiment 1 heats up in a stirring tank so that it may mention later. For this reason, the positive electrode plate slurry SC in the stirring tank 102 is cooled by the first cooling mechanism 120, but the slurry temperature TS of the positive electrode plate slurry SC is lower than the tank temperature TF of the stirring tank 102. No (slurry temperature TS> tank temperature TF). Further, the positive electrode plate slurry SC in the second flow path member 110B is cooled by the second cooling mechanism 130, but the slurry temperature TS is never lower than the member temperature TT of the second flow path member 110B. (Slurry temperature TS> Member temperature TT).

  As described above, dew condensation can be prevented at any place (agitating tank 102 and second flow path member 110B) where the positive electrode slurry SC is present. Therefore, according to the manufacturing apparatus 100 according to the first embodiment, it is possible to manufacture a positive electrode plate slurry SC with good characteristics by preventing degradation of characteristics due to moisture mixing such as decomposition reaction and solidification due to moisture mixing.

  Further, in the positive plate slurry SC manufacturing apparatus 100 according to the first embodiment, the stirring tank 102 has the first cooling mechanism 120 and the second flow path member 110B has the second cooling mechanism 130, respectively. For this reason, when the positive electrode plate slurry SC flows in the stirring tank 102, the positive plate slurry SC can be cooled using the first cooling mechanism 120. Further, when the positive electrode plate slurry SC flows through the second flow path member 110B, the positive plate slurry SC can be cooled using the second cooling mechanism 130. Therefore, according to the manufacturing apparatus 100, it is possible not only to prevent moisture mixing but also to prevent the deterioration of characteristics due to high temperature, and to manufacture the positive electrode plate slurry SC having good characteristics.

  In addition, since the dry air supply mechanism 150 described above is provided, the dry air supply mechanism 150 can be used to dry the entire second flow path PS2 prior to flowing the positive electrode plate slurry SC. . Further, in the second flow path PS2, the dew point of the flow path atmosphere PS2G in contact with at least the positive electrode plate slurry SC can be lowered to prevent dew condensation in the second flow path PS2.

  The manufacturing apparatus 100 includes a dew point meter 141. For this reason, for example, the dry air DA is supplied to the second flow path member 110B until the flow path atmosphere PS2G becomes equal to or less than a predetermined value TK that does not cause condensation even when the positive electrode plate slurry SC or the second flow path member 110B is touched. Proper dew point management is possible, for example, by lowering the atmosphere dew point TG of the atmosphere PS2G in the flow path by distributing it. . Thus, condensation in the second flow path PS2 can be reliably prevented.

  Further, since the dew point meter 141 is connected to the second flow path PS2 via the valve 143, the valve 143 is opened before the measurement of the atmospheric dew point TG, and the valve 143 is closed at the time of measurement. The atmosphere dew point TG of the atmosphere PS2G can be stably measured.

Next, a method for producing the positive electrode slurry SC using the production apparatus 100 will be described with reference to the drawings.
In this method of manufacturing the positive electrode plate slurry SC, the agitation step is performed to obtain the positive electrode plate slurry SC in which the positive electrode active material SX and the binder SY are dispersed, and the stirred positive electrode plate slurry SC is stored in the storage tank. And a flow storage step of storing in the storage tank 103. Further, prior to the flow storage step, the dry air DA is circulated over the entire second flow path PS2 through which the positive electrode plate slurry SC circulates, and the second flow path member 110B forming the second flow path PS2 is used for the positive electrode plate. A drying step of drying the member inner portion 110BH in contact with the slurry SC is provided.

First, the drying process will be described with reference to FIG. In this drying step, the dry air DA is caused to flow into the second flow path member 110B using the dry air supply mechanism 150. Specifically, the second flow of the second flow path member 110B from the dry air supply mechanism 151 of the dry air supply mechanism 150 is supplied to the second flow path member 110B through the dry air pipe 152 and the first branching section 110BP with the valve 153 opened. Pour into road PS2.
The dry air DA flowing into the second flow path member 110B is from the first branch part 110BP to the spiral part 110BZ side (right direction in FIG. 3), and from the first branch part 110BP to the stirring tank 102 side (left side in FIG. 3). Direction). Among these, the dry air DA that flows toward the spiral portion 110BZ side flows through the spiral portion 110BZ of the second flow path PS2 and the filter portion 111 disposed in the middle of the second flow path PS2, and flows out from the outlet 110BE. On the other hand, after the dry air DA flowing toward the stirring tank 102 flows through the second flow path PS2, the dry air DA flows through the stirring tank 102 and the first flow path PS1 in the first flow path member 110A, thereby supplying the supply tank 101. Go out (see Figure 1). That is, since the dry air DA flows through the entire second flow path PS2 and the entire tank interior PST to the stirring tank 102, the member inner portion 110BH and the stirring tank 102 of the second flow path member 110B are dried in the drying process. Let

In the drying step described above, the atmospheric dew point TG of the flow path atmosphere PS2G of the second flow path PS2 is measured using the dew point meter 141 of the dew point measurement mechanism 140 while supplying the dry air DA. At this time, the valve 143 that opens and closes the circulation of the flow path atmosphere PS2G is temporarily closed.
In measuring the atmospheric dew point TG of the flow path atmosphere PS2G with the dew point meter 141, the atmospheric dew point TG is set so that the flow path atmosphere PS2G does not move around the dew point meter 141, rather than measuring with the dry air DA being circulated. The measured one can measure the atmospheric dew point TG more stably. Therefore, in the drying process, the valve 143 is opened before the measurement of the atmospheric dew point TG, and the measurement pipe 142 is set to be the same as the flow path atmosphere PS2G of the second flow path PS2. In the measurement, the valve 143 is closed and measured. Thereby, the atmospheric dew point TG of the flow path atmosphere PS2G can be measured more stably.

When the atmospheric dew point TG is equal to or less than the above-described predetermined value TK using the dew point meter 141, the first cooling mechanism 120 of the stirring tank 102 and the second flow path member 110B of the second flow path member 110B are supplied while supplying the dry air DA. Each cooling mechanism 130 is operated. Accordingly, the first cooling mechanism 120 cools the stirring tank 102 itself, and the second cooling mechanism 130 cools the member inner portion 110BH of the second flow path member 110B.
When the tank temperature TF of the agitation tank 102 and the member temperature TT of the member inner portion 110BH both reach a predetermined temperature, the supply of the dry air DA by the dry air supply mechanism 150 is stopped (the valve 153 is closed), and the drying process is completed. Let

Next, the stirring process will be described with reference to FIG.
In this agitation step, first, in the supply tank 101 of the manufacturing apparatus 100, a conductive assistant comprising a solvent SW, a particulate positive electrode active material SX, a binder SY made of a resin dissolved in the solvent SW, and acetylene black. The untreated slurry SB containing the material SZ is accommodated. Among these, the solvent SW is made of N-methyl-2-pyrrolidone (NMP), the positive electrode active material SX is made of LiNiO ₂ , and the binder SY is made of polyvinylidene fluoride (PVDF).
In addition, these weight ratios were set to positive electrode active material SX: binder SY: conducting aid SZ = 93: 4: 3.

  When the pretreatment slurry SB is stored in the supply tank 101, the pretreatment slurry SB is caused to flow into the first flow path PS1 of the first flow path member 110A using the liquid feed pump 170 disposed in the first flow path member 110A. Then, the pretreatment slurry SB is made to reach the stirring tank 102 to which the first flow path member 110 </ b> A is connected, and is stored in the stirring tank 102.

In the agitation tank 102, the pretreatment slurry SB is agitated using the agitation splash 102W and the motor unit 102M to disperse the positive electrode active material SX, the binder SY, and the conductive additive SZ. As a result, a positive electrode plate slurry SC in which the positive electrode active material SX, the binder SY, and the conductive additive SZ are dispersed can be obtained.
In addition, the slurry SC for positive electrode plate of this Embodiment 1 will heat up by receiving the big shear force from the stirring splash 102W at the time of stirring. However, since the stirring tank 102 itself is cooled by the first cooling mechanism 120 before and during the stirring step, the temperature of the slurry SC for the positive electrode plate is increased to, for example, the melting point of the binder 21Y. To prevent.
The positive electrode plate slurry SC formed in the stirring tank 102 flows into the second flow path PS2 of the second flow path member 110B so as to be pushed out from the first flow path member 110A to the pre-treatment slurry SB newly accommodated. .

Next, in the fluid storage process, the positive electrode plate slurry SC flows to the storage tank 103 and is stored in the storage tank 103.
Specifically, the positive electrode plate slurry SC is caused to flow in the second flow path PS2 of the second flow path member 110B. Then, the positive electrode plate slurry SC flowing out from the outlet 110BE of the second flow path member 110B is stored in the storage tank 103 and stored.

In the filter unit 111, the positive electrode plate slurry SC is temporarily deposited on the mesh filter unit 111A. And the slurry SC for positive electrode plates on the mesh filter part 111A is rubbed using the scraper part 111B. As a result, bubbles in the positive electrode plate slurry SC can be eliminated or foreign substances can be removed from the positive electrode plate slurry SC.
Further, in the spiral portion 110BZ of the second flow path member 110B, the member inner portion 110BH of the spiral portion 110BZ is cooled by the second cooling mechanism 130 before and during the flow of the positive electrode plate slurry SC. The board slurry SC can be further cooled.
Further, in the storage tank 103, the stirring splash 103W is rotated to prevent the stored positive electrode plate slurry SC from condensing.

  As mentioned above, in the manufacturing method of the slurry SC for positive electrode plates concerning this Embodiment 1, it is provided with the above-mentioned stirring process and flow storage process, and the positive electrode plate in any place where the slurry SC for positive electrode plates exists. The agitation step and the flow storage step are performed in a state where the temperature T2 of the slurry SC and the member inner portion 110BH with which the positive electrode plate slurry SC is in contact is higher than the atmospheric dew point TG. For this reason, in any place where the positive electrode plate slurry SC is present, condensation can be prevented and the stirring step and the flow storage step can be performed. Therefore, it is possible to prevent a malfunction due to moisture mixing such as decomposition reaction and solidification due to mixing of moisture due to condensation into the dispersed slurry, and to produce a positive electrode plate slurry SC having good characteristics.

  Moreover, since a fluid storage process has a cooling process, this can be cooled at the time of distribution | circulation of the slurry SC for positive electrode plates. Therefore, it is possible to manufacture the positive electrode slurry SC that prevents not only the mixing of moisture but also the deterioration of the characteristics due to the high temperature.

  In addition, since the above-described drying process is provided, the positive electrode plate slurry of moisture adhering to at least the member inner portion 110BH in contact with the positive electrode plate slurry SC in the second flow path member 110B forming the second flow path PS2. Mixing into the SC can be prevented.

  Further, the dry air DA is circulated until the atmospheric dew point TG becomes equal to or less than the predetermined value TK. For this reason, the dew condensation in 2nd flow path PS2 can be prevented reliably.

  Moreover, in the manufacturing method of the positive electrode plate slurry SC according to the first embodiment, a valve 143 is provided between the second flow path PS2 and the dew point meter 141 and is connected to the second flow path PS2 via the valve 143. Since the dew point meter 141 is used and the valve 143 is closed to measure the atmospheric dew point TG, the atmospheric dew point TG can be measured more stably.

In the above, the present invention has been described with reference to the first embodiment. However, the present invention is not limited to the above-described embodiment, and it is needless to say that the present invention can be appropriately modified and applied without departing from the gist thereof.
For example, in the first embodiment, the manufacturing apparatus 100 that manufactures the positive electrode plate slurry SC is shown. However, the manufacturing apparatus 100 is not limited to the positive electrode plate slurry, and may be a manufacturing apparatus that manufactures the negative electrode plate slurry. In addition, the space between the supply tank 101 and the second flow path member 110B in the manufacturing apparatus 100 is closed air so that the dispersed slurry (electrode slurry) in the flow storage process is not exposed to the outside air. However, for example, the manufacturing apparatus is configured such that the dispersed slurry comes into contact with the outside air (room air) (for example, the form in which the outside air flows into the tubular second flow path member 110B or the upper part of the second flow path member 110B is opened). The dispersed slurry may come into contact with the outside air in the fluid storage process.
Moreover, although the slurry for electrodes was used as it was as the dispersion slurry produced in the stirring step, other substances may be added to the dispersion slurry or processed.

100 Manufacturing equipment 102 Stirring tank (stirring means)
103 Storage tank (storage part)
110B second flow path member (member, flow path member)
110BH member inner part (part)
130 Second cooling mechanism (cooling means)
141 Dew point meter 143 Valve 150 Dry air supply mechanism (dry air distribution means)
DA dry air PS2 second flow path (location, flow path)
PS2G Flow path atmosphere (atmosphere)
PST tank flow path (place)
SC positive electrode slurry (dispersed slurry, electrode slurry)
SB Pretreatment slurry SW Solvent SX Positive electrode active material (active material particles)
SY binder (resin)
TF tank temperature (component temperature)
TG Atmospheric dew point TK Predetermined value TS Slurry temperature TT Member temperature

Claims (10)

A method for producing a slurry for an electrode comprising a solvent, active material particles and a resin dissolved in the solvent,
An agitation step in which the active material particles and the resin are dispersed into each other by stirring to form a dispersed slurry;
A flow storage step of flowing the stirred dispersion slurry to the storage unit and storing in the storage unit,
The stirring step and the fluid storage step are
In any place where the dispersion slurry is present, the slurry temperature of the dispersion slurry in the place and the member temperature of the member in contact with the dispersion slurry are determined from the dew point temperature of the atmosphere in contact with the dispersion slurry in this place. The manufacturing method of the slurry for electrodes performed while making it into a high state. It is a manufacturing method of the slurry for electrodes according to claim 1,
The fluid storage step includes
The manufacturing method of the slurry for electrodes including the cooling process cooled while making the said dispersion | distribution slurry flow. It is a manufacturing method of the slurry for electrodes according to claim 1 or 2,
Prior to the flow storage step, an electrode including a drying step of drying at least a portion in contact with the dispersion slurry among the members forming the flow passage by flowing dry air over the entire flow passage through which the dispersion slurry flows. Slurry manufacturing method. It is a manufacturing method of the slurry for electrodes according to claim 3,
The drying step
The manufacturing method of the slurry for electrodes which distribute | circulates the said dry air until the atmospheric dew point temperature of the atmosphere in a flow path located in the said flow path becomes below a predetermined value. It is a manufacturing method of the slurry for electrodes according to claim 4,
The drying step
A method for producing an electrode slurry, wherein the valve is closed and the atmospheric dew point temperature is measured by a dew point meter connected to the flow path through a valve that opens and closes the circulation of the atmosphere in the flow path. An apparatus for producing a slurry for an electrode comprising a solvent, active material particles, and a resin dissolved in the solvent,
A stirring means for stirring a pre-treatment slurry containing the solvent, the active material particles and the resin to form a dispersed slurry in which the active material particles and the resin are dispersed;
A flow path member that forms a flow path for flowing the dispersion slurry and leading from the stirring means to the storage section,
The stirring means and the flow path member are
In any place where the dispersion slurry is present, the slurry temperature of the dispersion slurry in the place and the member temperature of the member in contact with the dispersion slurry are higher than the dew point temperature of the atmosphere in contact with the dispersion slurry in this place. An apparatus for producing slurry for electrodes that is in a high state. It is a manufacturing apparatus of the slurry for electrodes according to claim 6,
The flow path member is
An apparatus for producing an electrode slurry, comprising cooling means for cooling the dispersed slurry while flowing. It is a manufacturing apparatus of the slurry for electrodes according to claim 6 or 7,
An apparatus for producing an electrode slurry, comprising dry air circulation means for circulating dry air over the entire flow path. It is a manufacturing apparatus of the slurry for electrodes according to claim 8,
An apparatus for producing a slurry for an electrode, comprising a dew point meter for measuring the atmospheric dew point temperature of the atmosphere in the flow path located in the flow path. It is a manufacturing apparatus of the slurry for electrodes according to claim 9,
The dew point meter
An apparatus for producing slurry for an electrode connected to the flow path via a valve that opens and closes circulation of the atmosphere in the flow path.

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