Electrode slurry and preparation method thereof

Abstract

The invention discloses electrode slurry and a preparation method thereof, and the preparation method of the electrode slurry comprises the following steps: mixing an electrode solvent and conductive slurry to obtain a conductive mixture, and dispersing the conductive mixture to obtain first dispersed slurry; mixing an electrode main material, a binder and a conductive agent to obtain mixed powder; adding the mixed powder into the first dispersed slurry, and dispersing to obtain second dispersed slurry; and dispersing and defoaming the second dispersed slurry. According to the invention, the preparation time of a single batch of electrode slurry can be effectively reduced, the viscosity difference among multiple batches of continuously produced electrode slurry is reduced, and the solid content is increased.

Description

Technical Field

[0001] The present invention belongs to the technical field of lithium-ion batteries, and particularly relates to an electrode paste and a preparation method thereof. Background Art

[0002] In recent years, with the continuous development and progress of the new energy industry, lithium-ion batteries have been widely used in power vehicles and energy storage, etc. At the same time, higher quality requirements have been put forward for the entire manufacturing process of lithium-ion batteries. Among them, paste preparation plays an important role in the entire manufacturing process of lithium-ion batteries.

[0003] Currently, the preparation process of lithium-ion battery paste mainly adopts the double planetary stirring process. This process method is mature, the equipment is simple and easy to operate, but the stirring time of a can of paste generally requires 4 - 8 hours. Under the same production capacity requirements, more stirring equipment needs to be configured, and the floor area of the workshop, equipment energy consumption and maintenance costs also increase accordingly. Moreover, there are large differences in the viscosity, etc. of the prepared paste between batches, which cannot meet the requirements of customers.

[0004] Therefore, it is necessary to provide a new solution.

[0005] The information disclosed in this background art section is only intended to enhance the overall understanding of the present invention and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Invention

[0006] The purpose of the present invention is to provide an electrode paste and a preparation method thereof, which can effectively reduce the preparation time of a single batch of electrode paste, reduce the difference in viscosity between multiple batches of electrode paste in continuous production, and improve the solid content of the electrode paste.

[0007] To achieve the above purpose, a specific embodiment of the present invention provides a preparation method of an electrode paste, including the following steps:

[0008] Mix an electrode solvent and a conductive paste to obtain a conductive mixture, and disperse the conductive mixture to obtain a first dispersed paste;

[0009] Mix an electrode main material, a binder, and a conductive agent to obtain a mixed powder;

[0010] Add the mixed powder to the first dispersed paste for dispersion to obtain a second dispersed paste;

[0011] Disperse and defoam the second dispersed paste.

[0012] In one or more embodiments of the present invention, the electrode solvent includes NMP; and / or,

[0013] The conductive paste includes at least one of CNT conductive paste or graphene conductive paste; and / or,

[0014] The mass ratio of the electrode solvent to the conductive paste is (4.5 to 7):1.

[0015] In one or more embodiments of the present invention, mixing the electrode solvent and the conductive paste includes: stirring and mixing the electrode solvent and the conductive paste in a circulation tank for 1 to 60 minutes;

[0016] Dispersing the conductive mixture includes: circulating and stirring the conductive mixture in a pulping machine and a circulation tank.

[0017] In one or more embodiments of the present invention, the linear velocity of the pulping machine is 10 to 30 m / s;

[0018] The time for circulating and stirring dispersion is 1 to 30 minutes;

[0019] The slurry circulation flow rate between the pulping machine and the circulation tank is 600 to 900 L / min.

[0020] In one or more embodiments of the present invention, adding the mixed powder to the first dispersion slurry for dispersion includes:

[0021] Adding the mixed powder into the pulping machine and mixing and dispersing it with the first dispersion slurry in the pulping machine;

[0022] In the mixing and dispersion, the linear velocity of the pulping machine is 10 to 30 m / s, the mixing and dispersion time is 1 to 30 minutes, and the slurry circulation flow rate range between the pulping machine and the circulation tank is 600 to 900 L / min.

[0023] In one or more embodiments of the present invention, by mass percentage, the mixed powder includes the following raw material components: 80% to 98% of the main electrode material, 1% to 10% of the binder, and 1% to 10% of the conductive agent; the main electrode material includes lithium iron phosphate; the binder includes PVDF; the conductive agent is a carbon black conductive agent.

[0024] In one or more embodiments of the present invention, mixing the main electrode material, the binder, and the conductive agent includes: stirring and mixing the main electrode material, the binder, and the conductive agent in a mixing bin for 1 to 60 minutes; and / or,

[0025] Dispersing the second dispersion slurry includes: dispersing the second dispersion slurry in a dispersion tank; wherein, the stirring linear velocity of the dispersion tank is 10 to 30 m / s, and the dispersion time is 1 to 60 minutes.

[0026] In one or more embodiments of the present invention, the defoaming of the second dispersion slurry after dispersion includes:

[0027] Transfer the well-dispersed second dispersion slurry to a finished product tank, and defoam it for 10 to 120 minutes under the condition that the relative pressure is less than or equal to -95 kPa.

[0028] In one or more embodiments of the present invention, the mass ratio of the first dispersion slurry to the mixed powder is 1:(1.3 - 1.8).

[0029] A specific embodiment of the present invention provides an electrode slurry prepared by the above-mentioned preparation method of the electrode slurry.

[0030] Compared with the prior art, the preparation method of the electrode slurry of the present invention greatly shortens the preparation time of a single batch of electrode slurry, improves the solid content of the electrode slurry, and enhances the manufacturing efficiency and the competitive advantage of the electrode slurry on the premise of ensuring the quality of the finished product; in addition, when the preparation method of the electrode slurry of the present invention is used for continuous production of multiple batches of electrode slurry, the viscosity difference between multiple batches of electrode slurry is relatively small. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0032] Figure 1 It is a flowchart of the preparation method of the electrode slurry in an example of the present invention;

[0033] Figure 2 It is a process flowchart of the preparation method of the electrode slurry in an example of the present invention;

[0034] Figure 3 It is a viscosity ratio diagram of different batches of electrode slurry in Example 1 of the present invention;

[0035] Figure 4 It is a solid content ratio diagram of different batches of electrode slurry in Example 1 of the present invention;

[0036] Figure 5 It is a process flowchart of the preparation method of the electrode slurry in Comparative Example 1 of the present invention;

[0037] Figure 6 It is a viscosity ratio diagram of different batches of electrode slurry in Comparative Example 1 of the present invention;

[0038] Figure 7It is a comparison chart of the solid content of different batches of electrode slurries in Comparative Example 1 of the present invention. Detailed implementation manners

[0039] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0040] As Figure 1 and Figure 2 shown, the preparation method of the electrode slurry in an example of the present invention includes the following steps:

[0041] S1. Mix the electrode solvent and the conductive paste to obtain a conductive mixture, and disperse the conductive mixture to obtain a first dispersed slurry;

[0042] S2. Mix the electrode main material, the binder, and the conductive agent to obtain a mixed powder;

[0043] S3. Add the mixed powder to the first dispersed slurry for dispersion to obtain a second dispersed slurry;

[0044] S4. Disperse and defoam the second dispersed slurry.

[0045] The preparation method of the electrode slurry of the present invention greatly shortens the preparation time of a single batch of electrode slurry on the premise of ensuring the quality of the electrode slurry, improves the manufacturing efficiency and the competitive advantage of the finished product; in addition, when the preparation method of the electrode slurry of the present invention is used to continuously produce multiple batches of electrode slurry, the viscosity and solid content differences between multiple batches of electrode slurry are small.

[0046] It can be understood that there is no strict sequence relationship between step S1 and step S2, that is, step S1 can be carried out first and then step S2, and then the subsequent step S3; step S2 can also be carried out first and then step S1, and then the subsequent step S3; step S1 and step S2 can also be carried out simultaneously, and then the subsequent step S3.

[0047] In the present invention, the electrode solvent includes NMP (N-methylpyrrolidone); the conductive paste includes at least one of CNT (carbon nanotube) conductive paste or graphene conductive paste; the mass ratio of the electrode solvent to the conductive paste is (4.5 - 7) : 1.

[0048] Preferably, in step S1, mixing the electrode solvent and the conductive paste includes:

[0049] Stir and mix the electrode solvent and the conductive paste in a circulation tank for 1 to 60 minutes; the electrode solvent and the conductive paste can be mixed into a uniform conductive mixture.

[0050] Furthermore, disperse the conductive mixture, including: circulating and stirring the conductive mixture in a pulping machine and a circulation tank for dispersion.

[0051] Specifically, in step S1, the linear velocity of the pulping machine is 10 to 30 m / s; the time for circulating and stirring dispersion is 1 to 30 minutes; the slurry circulation flow rate between the pulping machine and the circulation tank is 600 to 900 L / min.

[0052] It can be understood that the condition for performing step S3 (i.e., adding the mixed powder to the first dispersion slurry) is that the slurry circulation flow rate between the pulping machine and the circulation tank in step S1 reaches stability (at this time, the circulation between the pulping machine and the circulation tank does not stop).

[0053] Preferably, in step S2, by mass percentage, the mixed powder includes the following raw material components: 80% to 98% of the main electrode material, 1% to 10% of the binder, and 1% to 10% of the conductive agent; the main electrode material includes lithium iron phosphate; the binder includes PVDF (polyvinylidene fluoride); the conductive agent is a carbon black conductive agent.

[0054] Preferably, in step S2, mix the main electrode material, the binder, and the conductive agent, including: stirring and mixing the main electrode material, the binder, and the conductive agent in a mixing bin for 1 to 60 minutes. Step S2 is mainly to obtain a uniformly mixed powder.

[0055] It can be understood that steps S1 and S2 can be carried out synchronously, thereby improving the preparation efficiency of the slurry.

[0056] In step S3, add the mixed powder to the first dispersion slurry for dispersion, including:

[0057] Add the mixed powder into the pulping machine and mix and disperse it with the first dispersion slurry in the pulping machine.

[0058] In the mixing and dispersion, the linear velocity of the pulping machine is 10 to 30 m / s, the mixing and dispersion time is 1 to 30 minutes, and the slurry circulation flow rate range between the pulping machine and the circulation tank is 600 to 900 L / min.

[0059] It can be understood that the mixed powder in step S3 can be gradually added to the pulping machine, so as to have a better dispersion effect.

[0060] It should be noted that the mixing and dispersion of raw materials in steps S1 and S3 are carried out in a circulating pulper composed of a pulper and a circulation tank. The purpose is to form a high shear strength by the mixing and dispersion module in the circulating pulper, fully disperse and wet the mixed powder and the first dispersion slurry, effectively increase the probability of transforming the gas-solid interface of the powder into a liquid-solid interface, and thus improve the efficiency of mixing, dispersion and pulping.

[0061] Specifically, the mass ratio of the first dispersion slurry to the mixed powder is 1:(1.3 - 1.8).

[0062] Preferably, in step S4, the dispersion of the second dispersion slurry includes: dispersing the second dispersion slurry in a dispersion tank; wherein, the stirring linear velocity of the dispersion tank is 10 - 30 m / s, and the dispersion time is 1 - 60 min.

[0063] The above steps are first to better mix and disperse the second dispersion slurry; secondly, it can free up the space of the pulper, the circulation tank and the mixing bin. At this time, the pulper, the circulation tank and the mixing bin can carry out the preparation process of the next batch of slurry; that is, during the process of step S4, the pulper, the circulation tank and the mixing bin can simultaneously process the raw materials of the next batch of slurry, thereby improving the preparation efficiency of the preparation method of the electrode slurry of the present invention.

[0064] Preferably, in step S4, the defoaming after the dispersion of the second dispersion slurry includes:

[0065] Transfer the dispersed second dispersion slurry to a finished product tank, and under the condition that the relative pressure is less than or equal to -95 kPa, defoam for 10 - 120 min.

[0066] It can be understood that transferring the dispersed second dispersion slurry to the finished product tank is also to free up the space of the dispersion tank, so as to perform the mixing and dispersion treatment on the second dispersion slurry of the next batch. The relative pressure less than or equal to -95 kPa means 95 kPa lower than the atmospheric pressure, that is, taking the atmospheric pressure value at normal temperature as the comparison object.

[0067] The slurry after defoaming treatment is the final electrode slurry. The electrode slurry can be stored in the finished product tank, and the storage time is preferably less than or equal to 144 h. Too long storage time may lead to a decrease in the performance of the electrode slurry.

[0068] A specific example of the present invention provides an electrode slurry prepared by the above preparation method of the electrode slurry.

[0069] Specifically, the electrode slurry of the present invention can be used as the positive electrode slurry or the negative electrode slurry for preparing lithium-ion batteries.

[0070] Example 1

[0071] The CNT slurry and NMP are pumped into a circulation tank at a mass ratio of 1:5 and stirred and mixed for 10 min. The mixed conductive mixture is dispersed and circulated in a pulper and the circulation tank for 5 min. The linear velocity of the pulper is maintained at 21 m / s, and the flow rate of the circulation pump is set at 600 L / min to obtain the first dispersed slurry.

[0072] Lithium iron phosphate, PVDF, and SP are put into a mixing bin at a mass ratio of 96:2:2 and stirred and mixed for 20 min to obtain a uniformly mixed powder mixture.

[0073] According to the ratio that the mass ratio of the first dispersed slurry to the powder mixture is 1:1.5, the powder mixture is gradually fed into the pulper and highly mixed and dispersed with the uniformly dispersed first dispersed slurry. The premixing time is set at 30 min. The linear velocity of the pulper is maintained at 21 m / s, and the flow rate of the circulation pump is set at 600 L / min to obtain the second dispersed slurry.

[0074] The second dispersed slurry is transferred to a dispersion tank for high-efficiency circulation dispersion. The dispersion time is set at 60 min, and the linear velocity of dispersion is maintained at 21 m / s. After the second dispersed slurry is dispersed, it is transferred to a finished product tank for defoaming (under the condition of a relative pressure of -95 kPa for 30 min) to obtain the final electrode slurry.

[0075] Repeat the above steps until a total of 20 batches of electrode slurries are obtained, and the viscosities and solid contents of the 20 batches of electrode slurries are measured respectively to obtain the viscosity ratio diagrams of multiple batches of electrode slurries as shown in Figure 3 and the solid content ratio diagrams of multiple batches of electrode slurries as shown in Figure 4 .

[0076] Example 2

[0077] The CNT slurry and NMP are pumped into a circulation tank at a mass ratio of 1:4.5 and stirred and mixed for 5 min. The mixed conductive mixture is dispersed and circulated in a pulper and the circulation tank for 2 min. The linear velocity of the pulper is maintained at 24 m / s, and the flow rate of the circulation pump is set at 700 L / min to obtain the first dispersed slurry.

[0078] Lithium iron phosphate, PVDF, and SP are put into a mixing bin at a mass ratio of 98:1:1 and stirred and mixed for 30 min to obtain a uniformly mixed powder mixture.

[0079] According to the mass ratio of the first dispersion slurry to the mixed powder being 1:1.8, the mixed powder was gradually fed into the pulper, and was highly mixed and dispersed with the uniformly dispersed first dispersion slurry. The premixing time was set to 25 min, the linear speed of the pulper was maintained at 24 m / s, and the flow rate of the circulation pump was set to 700 L / min to obtain the second dispersion slurry.

[0080] The second dispersion slurry was transferred to a dispersion tank for efficient circulation dispersion. The dispersion time was set to 50 min, and the linear speed of dispersion was maintained at 24 m / s. After the second dispersion slurry was dispersed, it was transferred to a finished product tank for defoaming (under the condition of a relative pressure of -95 kPa for 120 min) to obtain the final electrode slurry.

[0081] Example 3

[0082] The graphene slurry and NMP were pumped into the circulation tank according to the mass ratio of 1:7 and stirred and mixed for 5 min. The mixed conductive mixture was dispersed and circulated in the pulper and the circulation tank. The circulation time was 2 min, the linear speed of the pulper was maintained at 21 m / s, and the flow rate of the circulation pump was set to 900 L / min to obtain the first dispersion slurry.

[0083] Lithium iron phosphate, PVDF, and SP were put into the mixing bin according to the mass ratio of 80:10:10 and stirred and mixed for 30 min to obtain a uniformly mixed powder.

[0084] According to the mass ratio of the first dispersion slurry to the mixed powder being 1:1.3, the mixed powder was gradually fed into the pulper, and was highly mixed and dispersed with the uniformly dispersed first dispersion slurry. The premixing time was set to 20 min, the linear speed of the pulper was maintained at 24 m / s, and the flow rate of the circulation pump was set to 900 L / min to obtain the second dispersion slurry.

[0085] The second dispersion slurry was transferred to a dispersion tank for efficient circulation dispersion. The dispersion time was set to 45 min, and the linear speed of dispersion was maintained at 24 m / s. After the second dispersion slurry was dispersed, it was transferred to a finished product tank for defoaming (under the condition of a relative pressure of -100 kPa for 10 min) to obtain the final electrode slurry.

[0086] Comparative Example 1

[0087] As Figure 5 shown, lithium iron phosphate, PVDF, SP, and CNT were prepared according to the mass ratio of 96:2:1:1.

[0088] Slurry preparation: PVDF and NMP are added to a double-planet stirring tank according to a mass ratio of 1:36 and stirred and dispersed. The linear velocity of dispersion is maintained at 18 m / s, and the stirring and dispersion time is 240 min to obtain the first dispersed slurry.

[0089] According to the above mass ratio, the conductive agent CNT is added to the double-planet stirring tank and stirred and dispersed. The linear velocity of dispersion is maintained at 18 m / s, and the stirring and dispersion time is 60 min to obtain the second dispersed slurry.

[0090] According to the above mass ratio, the conductive agent SP is added to the double-planet stirring tank and stirred and dispersed. The linear velocity of dispersion is maintained at 18 m / s, and the stirring and dispersion time is 60 min to obtain the third dispersed slurry.

[0091] According to the above mass ratio, the main electrode material lithium iron phosphate is added to the double-planet stirring tank and stirred and dispersed. The linear velocity of dispersion is maintained at 21 m / s, and the stirring and dispersion time is 120 min, and defoaming treatment is carried out (under the condition of a relative pressure of -95 kPa, defoaming for 30 min) to obtain the well-mixed and dispersed electrode slurry.

[0092] Repeat the above steps until a total of 20 batches of electrode slurries are obtained, and the viscosities and solid contents of the 20 batches of electrode slurries are measured respectively to obtain Figure 6 the viscosity comparison chart of multiple batches of electrode slurries as shown, and Figure 7 the solid content comparison chart of multiple batches of electrode slurries as shown.

[0093] Through Figure 3 and Figure 6 the data, it can be seen that when the preparation method of the electrode slurry of the present invention continuously produces 20 batches of electrode slurries, among the 20 batches of electrode slurries, the maximum viscosity is 12414 mPa·s, the minimum viscosity is 10223 mPa·s, the average viscosity is about 11465, and the viscosity fluctuation range is -10.8% to 8.2%. When the preparation method of the electrode slurry of Comparative Document 1 continuously produces 20 batches of electrode slurries, among the 20 batches of electrode slurries, the maximum viscosity is 11989 mPa·s, the minimum viscosity is 8009 mPa·s, the average viscosity is about 9966, and the viscosity fluctuation range is -19.6% to 20.2%.

[0094] As can be seen from the above data, when the preparation method of the electrode paste of the present invention continuously produces multiple batches of electrode paste, the viscosity fluctuation upper limit and the viscosity fluctuation lower limit between multiple batches of electrode paste are much smaller than those of the preparation method of the electrode paste in Comparative Example 1 when continuously producing multiple batches of electrode paste. Therefore, it can be concluded that the preparation method of the electrode paste of the present invention can not only shorten the preparation time of single batch and multiple batches of electrode paste, but also reduce the viscosity difference between multiple batches of electrode paste, with high consistency of the paste product, and can meet the needs of most customers.

[0095] In addition, from Figure 4 and Figure 7 data, it can be seen that the average solid content of the electrode paste prepared by the preparation method of the electrode paste of the present invention when continuously producing multiple batches of electrode paste is significantly higher than that of the preparation method of the electrode paste in Comparative Example 1 when continuously producing multiple batches of electrode paste.

[0096] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0097] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for preparing an electrode slurry, characterized in that: The following steps are involved: Mixing the electrode solvent and the conductive slurry to obtain a conductive mixture, and dispersing the conductive mixture to obtain a first dispersed slurry; The electrode main material, the binder and the conductive agent are mixed to obtain a mixed powder; Adding the mixed powder into the first dispersed slurry for dispersion to obtain a second dispersed slurry; The second dispersed slurry is dispersed and defoamed.

2. The method for preparing the electrode slurry according to claim 1, characterized in that: The electrode solvent comprises NMP; and / or, The conductive paste includes at least one of CNT conductive paste and graphene conductive paste; and / or, The mass ratio of the electrode solvent to the conductive paste is (4.5-7):

1.

3. The method for preparing the electrode slurry according to claim 1, characterized in that: The electrode solvent and the conductive paste are mixed, including: stirring and mixing the electrode solvent and the conductive paste in a circulation tank, the stirring and mixing time being 1 to 60 minutes; The conductive mixture is dispersed, including: circulating, stirring and dispersing the conductive mixture in a pulping machine and a circulation tank.

4. The method for preparing the electrode slurry according to claim 3, characterized in that: The linear speed of the pulping machine is 10 to 30 m / s; The time of circulating stirring and dispersing is 1 to 30 minutes; The slurry circulation flow rate between the pulping machine and the circulation tank is 600-900 L / min.

5. The method for preparing the electrode slurry according to claim 3, characterized in that: Adding the mixed powder into the first dispersion slurry for dispersion includes: Adding the mixed powder into a pulping machine and mixing and dispersing it with the first dispersed slurry in the pulping machine; In the mixing and dispersing step, the linear speed of the pulping machine is 10-30 m / s, the mixing and dispersing time is 1-30 min, and the circulation flow rate of the slurry between the pulping machine and the circulation tank is in the range of 600-900 L / min.

6. The method for preparing the electrode slurry according to claim 1, characterized in that: In terms of mass percentage, the mixed powder includes the following raw material components: 80% to 98% of the main electrode material, 1% to 10% of the binder, and 1% to 10% of the conductive agent; the main electrode material includes lithium iron phosphate; the binder includes PVDF; and the conductive agent is a carbon black conductive agent.

7. The method for preparing the electrode slurry according to claim 1, characterized in that: Mixing the electrode main material, the binder, and the conductive agent, including: stirring and mixing the electrode main material, the binder, and the conductive agent in a mixing bin for 1 to 60 minutes; and / or, Dispersing the second dispersed slurry includes: dispersing the second dispersed slurry in a dispersion tank; wherein the stirring line speed of the dispersion tank is 10 to 30 m / s, and the dispersion time is 1 to 60 min.

8. The method for preparing an electrode slurry according to claim 1, characterized in that: Degassing the second dispersed slurry after dispersion includes: The dispersed second dispersed slurry is transferred to a finished product tank and degassed for 10 to 120 minutes at a relative pressure less than or equal to -95 kPa.

9. The method for preparing an electrode slurry according to claim 1, characterized in that: The mass ratio of the first dispersed slurry to the mixed powder is 1:(1.3-1.8).

10. An electrode slurry, characterized in that: The electrode slurry is prepared by the method for preparing the electrode slurry according to any one of claims 1 to 9.

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