CN111509223A - Lithium ion battery anode binder and lithium ion battery anode slurry - Google Patents
Lithium ion battery anode binder and lithium ion battery anode slurry Download PDFInfo
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- CN111509223A CN111509223A CN202010304757.5A CN202010304757A CN111509223A CN 111509223 A CN111509223 A CN 111509223A CN 202010304757 A CN202010304757 A CN 202010304757A CN 111509223 A CN111509223 A CN 111509223A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
- H01M4/622—Binders being polymers
- H01M4/623—Binders being polymers fluorinated polymers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a lithium ion battery anode binder and lithium ion battery anode slurry, wherein the anode binder comprises high molecular weight PVDF and medium molecular weight PVDF, and the weight ratio of the high molecular weight PVDF to the medium molecular weight PVDF is (6-8): (2-4); the lithium ion battery positive electrode slurry contains a solid component and a solvent, and the solid component contains the positive electrode binder. The binder can overcome the physical gel problem of a high molecular weight PVDF binder in a nano lithium iron phosphate system, the prepared slurry has good stability, can meet the requirements of production and coating processing, and the PVDF is low in dosage, so that the proportion of a lithium iron phosphate material is further improved, and the energy density of a monomer battery cell is improved.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery anode binder and a lithium ion battery anode slurry.
Background
With the wide application of the nanoscale iron phosphate material in the lithium ion battery, the gram capacity of the lithium iron phosphate material is brought into full play, and in order to further improve the gram capacity of the monomer battery cell, the current chemical system proportion cannot meet the requirement of improving the energy density of the monomer battery cell. Polyvinylidene fluoride (PVDF) is a cathode binder widely applied to lithium ion batteries, the content of PVDF in a chemical system of a lithium iron phosphate battery of a main lithium ion battery manufacturer at present is 1.8-2.5% (mass percent), and if the usage amount of PVDF is reduced to 1.0-1.5%, the existing PVDF cannot meet the binding requirement, and the phenomena of coating cracking, rolling powder falling and the like caused by insufficient viscosity do not meet the requirements of production and battery electrical performance. Therefore, in order to meet the demands of production and battery performance while reducing the amount of PVDF used, it is desirable to use a high molecular weight PVDF. However, the nano lithium iron phosphate has the characteristics of large specific surface area and high specific surface energy, is in a thermally unstable system, and the high molecular weight PVDF cannot be well kneaded with the nano lithium iron phosphate material, so that the viscosity of the slurry rises too fast in the coating process, and nano particles are easy to agglomerate due to brownian motion, so that the slurry is directly subjected to physical gelation, and the subsequent coating cannot be normally carried out. Therefore, the solution of the physical gel problem of the high molecular weight PVDF binder in the nano lithium iron phosphate system is an urgent task to reduce the usage amount of PVDF.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a lithium ion battery anode binder and a lithium ion battery anode slurry.
The invention provides a lithium ion battery anode binder, which comprises high molecular weight PVDF and medium molecular weight PVDF, wherein the weight ratio of the high molecular weight PVDF to the medium molecular weight PVDF is (6-8): (2-4).
Preferably, the molecular weight of the high molecular weight PVDF is 110-130 ten thousand, and the molecular weight of the medium molecular weight PVDF is 60-80 ten thousand.
The invention also provides lithium ion battery anode slurry which comprises a solid component and a solvent, wherein the solid component comprises the lithium ion battery anode binder and accounts for 1-1.5% of the total weight of the solid component.
Preferably, the solid components of the lithium ion battery positive electrode slurry comprise the following raw materials in percentage by weight: 96-98% of nano lithium iron phosphate, 1-2.5% of conductive agent and 1-1.5% of lithium ion battery anode binder.
Preferably, the viscosity of the lithium ion battery anode slurry is 3000-10000mPa.s, and the solid content is 59-63%.
The preparation method of the lithium ion battery anode slurry comprises the following steps:
s1, uniformly mixing the lithium ion battery anode binder with a solvent to obtain a glue solution;
s2, uniformly mixing the glue solution and the conductive agent to obtain a mixture;
s3, adding the nano lithium iron phosphate into the mixture by more than two times, and uniformly stirring after adding each time to obtain initial slurry, wherein the amount of the nano lithium iron phosphate added for the first time is 45-55 wt%;
and S4, adjusting the viscosity and the solid content of the initial slurry to be in proper ranges.
Preferably, in the step S3, the frequency of each stirring is 20 to 25Hz, and the time is 0.5 to 1 hour.
Preferably, before the glue solution is mixed with the conductive agent, low-speed stirring defoaming treatment is further performed; the low-speed stirring defoaming treatment is carried out under a vacuum condition, the stirring frequency is 2-10 Hz, and the stirring time is 2-4 h.
Preferably, the initial slurry further comprises a high-speed stirring dispersion treatment before the viscosity and the solid content are adjusted; the high-speed stirring dispersion treatment is carried out under a vacuum condition, the stirring frequency is 35-40 Hz, the time is 3-5 h, and the temperature is 15-20 ℃.
Preferably, the D50 particle size of the nano lithium iron phosphate is 500-900 nm; the conductive agent is at least one of conductive carbon black and graphene; the particle size of D50 of the conductive carbon black is 10-100 nm, and the number of graphene sheets is less than 10; the solvent is N-methyl pyrrolidone.
Preferably, the nanometer lithium iron phosphate, the conductive carbon black and the lithium ion battery anode binder are pretreated before use, wherein the pretreatment method of the nanometer lithium iron phosphate comprises the following steps: treating for 8-12 h under the conditions of vacuum degree of-0.08-0.1 Mpa and temperature of 100-120 ℃; the pretreatment method of the conductive carbon black comprises the following steps: treating for 8-12 h under the conditions of vacuum degree of-0.08-0.1 Mpa and temperature of 80-100 ℃; the pretreatment method of the lithium ion battery anode binder comprises the following steps: treating for 8-12 h under the conditions of vacuum degree of-0.08 to-0.1 Mpa and temperature of 80-100 ℃.
The invention has the following beneficial effects:
according to the invention, the high molecular weight PVDF and the medium molecular weight PVDF are compounded to obtain the lithium ion anode binder, and the appropriate molecular weight and proportion are selected, so that the problem that the high molecular weight PVDF cannot be well kneaded with the nano lithium iron phosphate material when used as the binder can be well solved, and the stability of the slurry is improved; compared with the pole pieces made of the conventional adhesive, the pole pieces made of the rolled slurry prepared by the adhesive have equivalent peel strength of 200-300N/m (a 180-degree method is adopted for peel test), and the adhesive can effectively ensure the adhesion between a lithium iron phosphate material and a current collector and the adhesion between active substances.
The invention obtains the binder by compounding the PVDF with high molecular weight and the PVDF with medium molecular weight, and is applied to the preparation of the anode slurry, meanwhile, by adjusting and selecting important process parameters such as solid content, viscosity and the like of the anode slurry and in the preparation process of the anode slurry, by adding the nano lithium iron phosphate step by step, the problem that PVDF with molecular weight is taken as a binder to generate physical gel in the nano lithium iron phosphate slurry is solved, the Brownian motion of the nano lithium iron phosphate material under the action of no shearing force is effectively hindered, the secondary agglomeration of the nano lithium iron phosphate in the slurry is reduced, the stability of the slurry is ensured, and the requirements of production and coating processing can be met, therefore, the dosage of PVDF in the formula is successfully reduced from 1.8-2.5% to 1.0-1.5%, the proportion of the lithium iron phosphate material is further improved, and the energy density of the monomer battery core is improved. The positive electrode slurry prepared by the invention has excellent stability and coating performance, and the prepared battery has more excellent electrical performance compared with the traditional battery.
Drawings
Fig. 1 is an SEM image of the plane and cross-section of a lithium iron phosphate battery pole piece prepared from the binder of example 2 and the conventional PVDF binder of comparative example 1, wherein the left side of fig. 1 is a cross-sectional view of the pole piece, and the right side is a plan view of the pole piece. .
Fig. 2 is a comparison of the cycling performance of lithium iron phosphate batteries prepared with the binder of example 2 and the conventional PVDF binder of comparative example 1.
Fig. 3 is a graph of the ac impedance of a lithium iron phosphate battery prepared with the binder of example 2 and the conventional PVDF binder of comparative example 1.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
The positive electrode binder for the lithium ion battery comprises high-molecular-weight PVDF and medium-molecular-weight PVDF, wherein the weight ratio of the high-molecular-weight PVDF to the medium-molecular-weight PVDF is (6-8): (2-4).
Wherein the molecular weight of the PVDF with high molecular weight is 110-130 ten thousand, and the molecular weight of the PVDF with medium molecular weight is 60-80 ten thousand.
The positive electrode slurry of the lithium ion battery comprises a solid component and a solvent, wherein the solid component comprises the following raw materials in percentage by weight: 96-98% of nano lithium iron phosphate, 1-2.5% of conductive agent and 1-1.5% of lithium ion battery anode binder.
The viscosity of the lithium ion battery positive electrode slurry is 3000-10000mPa.s, and the solid content is 59-63%.
The preparation method of the lithium ion battery anode slurry comprises the following steps:
s1, uniformly mixing the lithium ion battery anode binder with a solvent to obtain a glue solution;
s2, uniformly mixing the glue solution and the conductive agent to obtain a mixture;
s3, adding the nano lithium iron phosphate into the mixture by more than two times, and uniformly stirring after adding each time to obtain initial slurry, wherein the amount of the nano lithium iron phosphate added for the first time is 45-55 wt%;
and S4, adjusting the viscosity and the solid content of the initial slurry to be in proper ranges.
Example 2
The positive electrode binder of the lithium ion battery comprises high molecular weight PVDF and medium molecular weight PVDF, wherein the weight ratio of the high molecular weight PVDF to the medium molecular weight PVDF is 8: 2, the molecular weight of the high molecular weight PVDF is 110 ten thousand, and the molecular weight of the medium molecular weight PVDF is 60 ten thousand.
The positive electrode slurry of the lithium ion battery comprises a solid component and a solvent, wherein the solid component comprises the following raw materials in percentage by weight: 97.5% of nano lithium iron phosphate, 1.2% of conductive agent and 1.3% of lithium ion battery anode binder.
The preparation method of the lithium ion battery anode slurry comprises the following steps:
s1, uniformly mixing the lithium ion battery anode binder with N-methyl pyrrolidone to obtain a glue solution, wherein the weight ratio of the binder to the N-methyl pyrrolidone is 0.06: 1.44;
s2, carrying out low-speed stirring defoaming treatment on the glue solution under a vacuum condition, wherein the stirring frequency is 2Hz, the stirring time is 2h, then adding conductive carbon black, uniformly mixing, and then adding graphene slurry with the solid content of 5% to obtain a mixture, wherein the graphene slurry is prepared by uniformly dispersing graphene in N-methyl pyrrolidone;
s3, adding 45 wt% of nano lithium iron phosphate into the mixture, stirring for 0.5h under the condition of 20Hz, then adding the balance of nano lithium iron phosphate, and stirring for 0.5h under the condition of 20Hz to obtain initial slurry;
and S4, carrying out high-speed stirring dispersion treatment on the initial slurry under a vacuum condition, wherein the stirring frequency is 40Hz, the time is 4h, the temperature is 18 ℃, and then adjusting the viscosity to 4500mPa.s and the solid content to 62% by using N-methyl pyrrolidone.
The pretreatment method of the nano lithium iron phosphate comprises the following steps: treating at-0.09 Mpa and 100 deg.C for 12 hr; the pretreatment method of the conductive carbon black comprises the following steps: treating at vacuum degree of-0.09 Mpa and temperature of 80 deg.C for 12 hr; the pretreatment method of the lithium ion battery anode binder comprises the following steps: treating at-0.09 Mpa and 80 deg.C for 12 hr.
Example 3
The positive electrode binder of the lithium ion battery comprises high molecular weight PVDF and medium molecular weight PVDF, wherein the weight ratio of the high molecular weight PVDF to the medium molecular weight PVDF is 6: 4, the molecular weight of the high molecular weight PVDF is 120 ten thousand, and the molecular weight of the medium molecular weight PVDF is 75 ten thousand.
The positive electrode slurry of the lithium ion battery comprises a solid component and a solvent, wherein the solid component comprises the following raw materials in percentage by weight: 96% of nano lithium iron phosphate, 2.5% of conductive agent and 1.5% of lithium ion battery anode binder.
The preparation method of the lithium ion battery anode slurry comprises the following steps:
s1, uniformly mixing the lithium ion battery anode binder with N-methyl pyrrolidone to obtain a glue solution, wherein the weight ratio of the binder to the N-methyl pyrrolidone is 0.058: 1.44;
s2, carrying out low-speed stirring defoaming treatment on the glue solution under a vacuum condition, wherein the stirring frequency is 10Hz, the stirring time is 4h, then adding conductive carbon black, uniformly mixing, and then adding graphene slurry with the solid content of 5% to obtain a mixture, wherein the graphene slurry is prepared by uniformly dispersing graphene in N-methyl pyrrolidone;
s3, adding 50 wt% of nano lithium iron phosphate into the mixture, stirring for 1 hour under the condition of 25Hz, then adding the rest nano lithium iron phosphate, and stirring for 1 hour under the condition of 25Hz to obtain initial slurry;
and S4, carrying out high-speed stirring dispersion treatment on the initial slurry under a vacuum condition, wherein the stirring frequency is 35Hz, the time is 5h, the temperature is 15 ℃, and then adjusting the viscosity to 10000mPa.s and the solid content to 63% by using N-methyl pyrrolidone.
The pretreatment method of the nano lithium iron phosphate comprises the following steps: treating at-0.1 Mpa vacuum degree and 120 deg.C for 8 hr; the pretreatment method of the conductive carbon black comprises the following steps: treating at-0.1 Mpa vacuum degree and 100 deg.C for 8 hr; the pretreatment method of the lithium ion battery anode binder comprises the following steps: treating at-0.1 Mpa and 100 deg.C for 8 hr.
Example 4
The positive electrode binder of the lithium ion battery comprises high molecular weight PVDF and medium molecular weight PVDF, wherein the weight ratio of the high molecular weight PVDF to the medium molecular weight PVDF is 7: 3, the molecular weight of the high molecular weight PVDF is 130 ten thousand, and the molecular weight of the medium molecular weight PVDF is 80 ten thousand.
The positive electrode slurry of the lithium ion battery comprises a solid component and a solvent, wherein the solid component comprises the following raw materials in percentage by weight: 98% of nano lithium iron phosphate, 1% of conductive agent and 1% of lithium ion battery anode binder.
The preparation method of the lithium ion battery anode slurry comprises the following steps:
s1, uniformly mixing the lithium ion battery anode binder with N-methyl pyrrolidone to obtain a glue solution, wherein the weight ratio of the binder to the N-methyl pyrrolidone is 0.05: 1.44;
s2, carrying out low-speed stirring defoaming treatment on the glue solution under a vacuum condition, wherein the stirring frequency is 5Hz, the stirring time is 3h, then adding conductive carbon black, uniformly mixing, and then adding graphene slurry with the solid content of 5% to obtain a mixture, wherein the graphene slurry is prepared by uniformly dispersing graphene in N-methyl pyrrolidone;
s3, adding 55 wt% of nano lithium iron phosphate into the mixture, stirring for 0.5h under the condition of 24Hz, then adding the balance of nano lithium iron phosphate, and stirring for 0.5h under the condition of 24Hz to obtain initial slurry;
and S4, carrying out high-speed stirring dispersion treatment on the initial slurry under a vacuum condition, wherein the stirring frequency is 36Hz, the time is 4h, the temperature is 20 ℃, and then adjusting the viscosity to 3000mPa.s and the solid content to 59% by using N-methyl pyrrolidone.
The pretreatment method of the nano lithium iron phosphate comprises the following steps: treating at-0.08 Mpa vacuum degree and 120 deg.C for 10 hr; the pretreatment method of the conductive carbon black comprises the following steps: treating at-0.08 Mpa vacuum degree and 90 deg.C for 10 hr; the pretreatment method of the lithium ion battery anode binder comprises the following steps: treating at-0.08 Mpa and 90 deg.C for 10 hr.
Comparative example 1
The molecular weight of the traditional PVDF binder for the power lithium ions is more than or equal to 110 ten thousand.
The lithium ion battery positive electrode slurry comprises a solid component and a solvent, wherein the solid component comprises the following raw materials in percentage by weight: 96.8% of nano lithium iron phosphate, 1.2% of conductive agent and 2.0% of the traditional PVDF binder.
The preparation method of the lithium ion battery anode slurry comprises the following steps:
s1, uniformly mixing the traditional PVDF binder and N-methyl pyrrolidone to obtain a glue solution, wherein the weight ratio of the binder to the N-methyl pyrrolidone is 0.06: 1.44;
s2, carrying out low-speed stirring defoaming treatment on the glue solution under a vacuum condition, wherein the stirring frequency is 2Hz, the stirring time is 2h, then adding conductive carbon black, uniformly mixing, and then adding graphene slurry with the solid content of 5% to obtain a mixture, wherein the graphene slurry is prepared by uniformly dispersing graphene in N-methyl pyrrolidone;
s3, adding 45 wt% of nano lithium iron phosphate into the mixture, stirring for 0.5h under the condition of 20Hz, then adding the balance of nano lithium iron phosphate, and stirring for 0.5h under the condition of 20Hz to obtain initial slurry;
and S4, carrying out high-speed stirring dispersion treatment on the initial slurry under a vacuum condition, wherein the stirring frequency is 40Hz, the time is 4h, the temperature is 18 ℃, and then adjusting the viscosity to 4500mPa.s and the solid content to 62% by using N-methyl pyrrolidone.
The pretreatment method of the nano lithium iron phosphate comprises the following steps: treating at-0.09 Mpa and 100 deg.C for 12 hr; the pretreatment method of the conductive carbon black comprises the following steps: treating at vacuum degree of-0.09 Mpa and temperature of 80 deg.C for 12 hr; the traditional PVDF binder pretreatment method comprises the following steps: treating at-0.09 Mpa and 80 deg.C for 12 hr.
The positive electrode slurry of example 2 and the positive electrode slurry prepared by blending the conventional PVDF binder of comparative example 1 were used to prepare a pole piece, and SEM, cycle performance and ac impedance tests were performed, and the test results are shown in fig. 1, fig. 2, and fig. 3. Fig. 1 shows that, although the amount of the binder is far lower than that of the conventional PVDF binder, the difference between the cross section and the plane of the rolled pole piece of the binder of the present invention and the rolled pole piece of the conventional PVDF binder is not large, which indicates that the binder of the present invention and the positive electrode slurry prepared by using the binder can meet the requirements of pole piece coating and rolling. Fig. 2 illustrates that the normal temperature cycle performance of the battery using the binder of the present invention is superior to that of the battery using the conventional PVDF binder. Fig. 3 illustrates that the ac impedance of the cell using the binder of the present invention is lower than that of the cell using the conventional PVDF binder. Therefore, it is demonstrated that the binder of the present invention and the positive electrode slurry prepared using the same exhibit more excellent electrical properties in a battery.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The lithium ion battery positive electrode binder is characterized by comprising high molecular weight PVDF and medium molecular weight PVDF, wherein the weight ratio of the high molecular weight PVDF to the medium molecular weight PVDF is (6-8): (2-4).
2. The positive electrode binder for lithium ion batteries according to claim 1, wherein the molecular weight of the high molecular weight PVDF is 110 to 130 ten thousand, and the molecular weight of the medium molecular weight PVDF is 60 to 80 ten thousand.
3. The lithium ion battery positive electrode slurry is characterized by comprising a solid component and a solvent, wherein the solid component comprises the lithium ion battery positive electrode binder disclosed by claim 1 or 2, and accounts for 1-1.5% of the total weight of the solid component; preferably, the solid component comprises the following raw materials in percentage by weight: 96-98% of nano lithium iron phosphate, 1-2.5% of a conductive agent and 1-1.5% of the lithium ion battery positive binder in claim 1 or 2.
4. The lithium ion battery positive electrode slurry according to claim 3, wherein the lithium ion battery positive electrode slurry has a viscosity of 3000 to 10000mPa.s and a solid content of 59 to 63%.
5. The preparation method of the lithium ion battery positive electrode slurry according to claim 3 or 4, characterized by comprising the following steps:
s1, uniformly mixing the lithium ion battery anode binder with a solvent to obtain a glue solution;
s2, uniformly mixing the glue solution and the conductive agent to obtain a mixture;
s3, adding the nano lithium iron phosphate into the mixture by more than two times, and uniformly stirring after adding each time to obtain initial slurry, wherein the amount of the nano lithium iron phosphate added for the first time is 45-55 wt%;
and S4, adjusting the viscosity and the solid content of the initial slurry to be in proper ranges.
6. The method for preparing the positive electrode slurry of the lithium ion battery according to claim 5, wherein in the step S3, the frequency of each stirring is 20-25 Hz, and the time is 0.5-1 h.
7. The preparation method of the lithium ion battery cathode slurry according to claim 5 or 6, wherein the glue solution is subjected to low-speed stirring defoaming treatment before being mixed with a conductive agent; the low-speed stirring defoaming treatment is carried out under a vacuum condition, the stirring frequency is 2-10 Hz, and the stirring time is 2-4 h.
8. The method for preparing the lithium ion battery cathode slurry according to any one of claims 5 to 7, wherein the initial slurry further comprises a high-speed stirring dispersion treatment before adjusting the viscosity and the solid content; the high-speed dispersion stirring treatment is carried out under a vacuum condition, the stirring frequency is 35-40 Hz, the time is 3-5 h, and the temperature is 15-20 ℃.
9. A positive electrode slurry for a lithium ion battery, which is produced by the production method according to any one of claims 5 to 8.
10. The lithium ion battery anode slurry according to claim 9, wherein the nano lithium iron phosphate has a D50 particle size of 500nm to 900 nm; the conductive agent is at least one of conductive carbon black and graphene; the particle size of D50 of the conductive carbon black is 10-100 nm, and the number of graphene sheets is less than 10; the solvent is N-methyl pyrrolidone.
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| CN113174208A (en) * | 2021-04-21 | 2021-07-27 | 山东航橡新材料有限公司 | Binder composition for lithium ion battery and preparation method thereof |
| CN114220970A (en) * | 2021-12-14 | 2022-03-22 | 芜湖天弋能源科技有限公司 | Lithium ion battery anode slurry and preparation method thereof |
| CN114497444A (en) * | 2022-02-16 | 2022-05-13 | 华鼎国联四川动力电池有限公司 | Ceramic slurry for protective coating of lithium ion battery pole piece and preparation method thereof |
| CN114551840A (en) * | 2022-02-26 | 2022-05-27 | 淮北市千锂鸟新能源科技有限公司 | Positive electrode slurry capable of improving safety performance of lithium ion battery and preparation method thereof |
| WO2022200345A1 (en) * | 2021-03-22 | 2022-09-29 | Solvay Specialty Polymers Italy S.P.A. | Composition for electrodes |
| WO2024045505A1 (en) * | 2022-08-30 | 2024-03-07 | 宁德时代新能源科技股份有限公司 | Binder composition, positive electrode slurry, secondary battery, battery module, battery pack, and electric device |
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