CN114420930A - Dispersing method of conductive agent in lithium ion battery slurry and lithium ion battery slurry - Google Patents
Dispersing method of conductive agent in lithium ion battery slurry and lithium ion battery slurry Download PDFInfo
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- CN114420930A CN114420930A CN202111584896.9A CN202111584896A CN114420930A CN 114420930 A CN114420930 A CN 114420930A CN 202111584896 A CN202111584896 A CN 202111584896A CN 114420930 A CN114420930 A CN 114420930A
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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
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
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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
- H01M4/04—Processes of manufacture in general
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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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
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Abstract
The invention belongs to the field of lithium ion batteries, and particularly relates to a method for dispersing a conductive agent in lithium ion battery slurry and the lithium ion battery slurry. The technical scheme adopted by the invention comprises the following steps: the lithium ion battery slurry comprises an active material, a conductive agent, a binder and a solvent, and the dispersing method comprises the following steps: stirring the binder and the solvent to obtain a uniformly mixed glue solution; adding a conductive agent into the glue solution, and carrying out primary stirring; dispersing the product with a radial-flow high-shear homogenizer until the slurry viscosity reaches 2200-; then stirring again; add the positive or negative active material and stir well to give a slurry with a viscosity of 5000-. The conductive agent dispersing method solves the problem of agglomeration of the conductive carbon black in the process of proportioning the anode slurry, and solves the problem of influence on the electrical property of the active material battery due to uneven distribution of the conductive agent by reducing the agglomeration of the conductive agent.
Description
Technical Field
The invention belongs to the field of lithium ion batteries, and particularly relates to a method for dispersing a conductive agent in lithium ion battery slurry and the lithium ion battery slurry.
Background
The lithium ion battery is a high and new technology product, is a novel high-capacity long-life environment-friendly battery at the same time, is composed of a positive pole piece, a negative pole piece, a diaphragm, electrolyte and the like, has excellent performance, and is mainly used in various fields of electric automobiles, electric tools, solar power generation and storage, aerospace and the like. The lithium ion battery has the advantages of high energy density, small self-discharge, no memory effect, wide working temperature range, quick charge and discharge, long service life, environmental friendliness and the like, and is called as a green battery.
The primary function of the conductive agent is to improve electron conductivity. In order to ensure that the electrode has good charge and discharge performance, a certain amount of conductive agent is usually added during the manufacture of the pole piece, and the function of collecting micro-current is achieved between active substances and between the active substances and a current collector, so that the contact resistance of the electrode is reduced, and the moving speed of electrons is accelerated. In addition, the conductive agent can also improve the processability of the pole piece, promote the soaking of electrolyte on the pole piece, and simultaneously can effectively improve the migration rate of lithium ions in an electrode material and reduce polarization, thereby improving the charging and discharging efficiency of the electrode and prolonging the service life of the lithium battery. However, the large specific surface area of the conductive carbon black brings the process problems of difficult dispersion and easy agglomeration, and affects the electrical property of the lithium battery.
In view of the above, there is a need to provide a method for solving the problems of difficult dispersion and easy agglomeration of conductive carbon black particles in lithium ion battery slurry.
Disclosure of Invention
The invention aims to provide a method for dispersing a conductive agent in lithium ion battery slurry, which solves the problem of agglomeration of conductive carbon black in the process of proportioning positive electrode slurry and reduces the influence on the electrical property of an active material battery due to uneven distribution of the conductive agent.
In order to achieve the above object, the present invention provides a method for dispersing a conductive agent in a lithium ion battery slurry and a lithium ion battery slurry thereof, and the technical scheme comprises the following steps:
the invention discloses a method for dispersing a conductive agent in lithium ion battery slurry, which comprises the following steps:
1) stirring the binder and the solvent to obtain a uniformly mixed glue solution;
2) adding a conductive agent into the glue solution obtained in the step (1), and carrying out primary stirring;
3) dispersing the product of step (2) by using a radial-flow high-shear homogenizer, and allowing the slurry viscosity to reach 2200-;
4) stirring the product of the step (3);
5) the active material was added to the product of step (4) and stirred well to give a slurry with a viscosity of 5000-.
According to the dispersion method of the conductive agent in the lithium ion battery slurry, the conductive agent is one of SP and acetylene black.
According to the dispersing method of the conductive agent in the lithium ion battery slurry, the adhesive is polyvinylidene fluoride, and the molecular weight of the adhesive is 90-130 ten thousand.
According to the method for dispersing the conductive agent in the lithium ion battery slurry, the solvent is N-methyl pyrrolidone, the purity of the N-methyl pyrrolidone is more than or equal to 99.9 percent, and the water content of the N-methyl pyrrolidone is less than or equal to 280 ppm;
according to the method for dispersing the conductive agent in the lithium ion battery slurry, the stirring speed in the step (1) is 20-25rpm, the rotation speed is 1000-1200rpm, and the dispersion time is 180-240 min.
The method for dispersing the conductive agent in the lithium ion battery slurry is characterized by comprising the following steps: the stirring speed revolution in the step (2) is 20-25rpm, the rotation is 1100-1300rpm, and the dispersion time is 10-20 min;
the method for dispersing the conductive agent in the lithium ion battery slurry is characterized by comprising the following steps: the rotating speed of the radial-flow high-shear homogenizer in the step (3) is 2100-2300rpm, and the dispersion time is 15-25 min;
the method for dispersing the conductive agent in the lithium ion battery slurry is characterized by comprising the following steps: the stirring speed revolution in the step (4) is 20-25rpm, the rotation is 1100-1300rpm, and the dispersion time is 10-20 min;
the method for dispersing the conductive agent in the lithium ion battery slurry is characterized by comprising the following steps: the stirring speed in the step (5) is converted into 25-30rpm, the rotation speed is 1200-1400rpm, and the dispersion time is 180-240 min.
The lithium ion battery slurry prepared by the dispersion method of the conductive agent in the lithium ion battery slurry comprises an active material, the conductive agent, a binder and a solvent, and the weight percentages of the components are as follows: 45.5 to 53.3 percent of active material, 0.8 to 1.2 percent of conductive agent, 0.9 to 1.2 percent of binder and 44.3 to 52.8 percent of solvent,
the conductive agent dispersing method solves the problem of agglomeration of the conductive carbon black in the process of proportioning the anode slurry, and solves the problem of influence on the electrical property of the active material battery due to uneven distribution of the conductive agent by reducing the agglomeration of the conductive agent.
The invention improves the dispersion effect of the conductive agent by the radial-flow high-shear homogenizer in the dispersion process, has better dispersion effect than the dispersion effect of the traditional stirrer, and can uniformly mix the electrode active substance and the conductive material by stirring again and adding the active substance after the dispersion of the radial-flow high-shear homogenizer, thereby enhancing the electronic transmission capacity and speed of the slurry.
Drawings
FIG. 1: preparing a battery internal resistance curve chart according to the first embodiment and the second embodiment of the invention;
FIG. 2: preparing a discharge capacity curve diagram at-20 ℃ of the battery according to the first comparative example scheme and the second embodiment scheme;
FIG. 3: the first embodiment of the present invention and the second embodiment of the present invention are used to prepare a charge-discharge cycle performance curve chart of the battery 5C.
Detailed description of the preferred embodiments
The following embodiments describe the present invention in detail, but the present invention is not limited to the following embodiments.
The invention aims to enhance the dispersion of the conductive agent in the preparation process of the lithium ion battery slurry so as to solve the problem of agglomeration of the conductive carbon black in the proportioning process of the anode slurry, thereby reducing the influence on the electrical property of the active material battery due to uneven distribution of the conductive agent.
The lithium ion battery slurry comprises active materials, a conductive agent, a binder and a solvent. The weight percentage of each component is 45.5-53.3% of active material, 0.8-1.2% of conductive agent, 0.9-1.2% of binder and 44.3-52.8% of solvent. The conductive agent can be SP or acetylene black, the adhesive is polyvinylidene fluoride, the molecular weight of the polyvinylidene fluoride is required to be 90-130 ten thousand, the solvent is N-methyl pyrrolidone, the purity of the N-methyl pyrrolidone is more than or equal to 99.9 percent, and the water content of the N-methyl pyrrolidone is less than or equal to 280 ppm.
The method for improving the dispersion effect of the conductive agent comprises the following steps:
firstly, the adhesive and the solvent are stirred, the stirring speed of the stirrer is 20-25rpm, the rotation speed is 1200rpm, and the stirring time is 240min and 180min, so as to obtain the uniformly mixed glue solution.
Then adding the conductive agent into the glue solution prepared in the step, putting the glue solution into a stirrer for stirring again, wherein the stirring speed is 20-25rpm in revolution, the rotation speed is 1100-1300rpm in rotation, and the dispersion time is 10-20 min.
And then dispersing the secondary stirring product by using a radial-flow high-shear homogenizer at the rotation speed of 2100-.
And stirring the product again after dispersion, wherein the stirring speed of the stirrer is 20-25rpm, the rotation speed is 1100-1300rpm, and the dispersion time is 10-20 min.
And adding the active material into the dispersion product containing the conductive agent, and uniformly stirring, wherein the stirring speed is converted to 25-30rpm, the rotation speed is 1200-.
The following embodiments describe the present invention in detail, but the present invention is not limited to the following embodiments.
Comparative example 1
1) Adding 19.2g of binder and 1000g of solvent into a stirring pot for stirring, wherein the stirring process comprises the following steps: revolution at 25rpm, rotation at 1200rpm, and dispersion time at 200min to prepare uniform mixture a;
2) adding 19.2g of conductive agent into a stirring pot containing the mixture 1 for stirring, wherein the stirring process comprises the following steps: revolution at 25rpm, rotation at 1200rpm, and dispersion time at 180min to obtain mixture b;
3) adding 961.5g of the positive electrode active material into a stirring pot containing the mixture b for stirring, wherein the stirring process comprises the following steps: revolution at 30rpm, rotation at 1300rpm, and dispersion time at 200min to prepare slurry of lithium ion battery with viscosity of 8523mPa & s;
4) a lithium battery manufacturing process: and screening the lithium ion battery slurry, coating the lithium ion battery slurry on a substrate, manufacturing a battery pole piece, winding the lithium ion battery slurry into a battery core, putting the battery core into a shell, injecting electrolyte, forming a finished battery, performing conventional procedures such as capacity grading on the battery and the like, and manufacturing the qualified lithium ion battery.
Testing the qualified lithium ion battery: and measuring the internal resistance of the lithium ion battery, discharging at the temperature of minus 20 ℃, and then charging and discharging at the capacity of 5 ℃ to perform cycle performance, wherein the temperature of the tested external environment is 25 +/-2 ℃.
A plot of the internal resistance of the lithium ion battery, as obtained in figure 1 for comparative example protocol one, a plot of the discharge capacity at-20C in figure 2, and a plot of the charge-discharge cycle performance at 5C in figure 3 were obtained.
Examples
1) Adding 19.2g of binder and 1000g of solvent into a stirring pot for stirring, wherein the stirring process comprises the following steps: revolution at 25rpm, rotation at 1200rpm, and dispersion time at 200min to prepare uniform mixture a;
2) adding 19.2g of conductive agent into a stirring pot containing the mixture a for stirring, wherein the stirring requires revolution at 25rpm, rotation at 1200rpm and dispersion time for 15min, and preparing a mixture b;
3) dispersing the mixture b by using a radial flow type high-shear homogenizer at the rotating speed of 2100rpm for 20min to prepare a mixture b with the viscosity of 2635 pas;
4) adding the mixture b into a stirring pot for stirring, wherein stirring requires revolution at 25rpm, rotation at 1200rpm, and dispersion time for 15min to prepare a mixture d;
5) 961.5g of the positive electrode active material is added into a stirring pot containing the mixture d for stirring, and the stirring is carried out for 30rpm revolution, 1300rpm rotation and 200min dispersion time, thus preparing the slurry of the lithium ion battery with the slurry viscosity of 7124mPa & s.
5) A lithium battery manufacturing process: and screening the lithium ion battery slurry, coating the lithium ion battery slurry on a substrate, manufacturing a battery pole piece, winding the lithium ion battery slurry into a battery core, putting the battery core into a shell, injecting electrolyte, forming a finished battery, performing conventional procedures such as capacity grading on the battery and the like, and manufacturing the qualified lithium ion battery.
Testing the qualified lithium ion battery: and measuring the internal resistance of the lithium ion battery, discharging at the temperature of minus 20 ℃, and then charging and discharging at the capacity of 5 ℃ to perform cycle performance, wherein the temperature of the tested external environment is 25 +/-2 ℃.
A plot of the internal resistance of the lithium ion battery, obtained as per the parameters of example protocol 2 in fig. 1, a plot of the discharge capacity at-20C in fig. 2, and a plot of the charge-discharge cycle performance at 5C in fig. 3 were obtained.
As can be seen from fig. 1, the internal resistance of the battery in the second embodiment is significantly lower than that of the battery in the first comparative embodiment. The data table shows that the dispersing method of the conductive agent can enhance the dispersing effect, reduce the agglomeration phenomenon of the conductive agent and reduce the internal resistance of the battery compared with the conventional dispersing method.
Fig. 2 shows discharge capacity curves of the batteries manufactured in the comparative example and the example at-20 c, and the lithium battery manufactured by the method in the second example has discharge capacities of 976mAh and 975.8mAh at a discharge current of 1100mA, which is higher than that of the conventional first comparative example.
Fig. 3 shows graphs of 5C charge-discharge cycle performance of the batteries manufactured in the comparative example and the example, and the lithium battery manufactured by the method in the second example has 92% of capacity at 1000 times of discharge cycle, and has better discharge cycle capacity than the conventional battery manufactured by the first comparative example and has 89% of capacity at 1000 times of discharge cycle.
Claims (10)
1. A method for dispersing a conductive agent in lithium ion battery slurry is characterized by comprising the following steps:
(1) stirring the binder and the solvent to obtain a uniformly mixed glue solution;
(2) adding a conductive agent into the glue solution obtained in the step (1), and carrying out primary stirring;
(3) dispersing the product of step (2) by using a radial-flow high-shear homogenizer, and allowing the slurry viscosity to reach 2200-; (ii) a
(4) Stirring the product of the step (3);
(5) the active material was added to the product of step (4) and stirred well to give a slurry with a viscosity of 5000-.
2. The method for dispersing the conductive agent in the lithium ion battery slurry according to claim 1, wherein the method comprises the following steps: the conductive agent is one of SP and acetylene black.
3. The method for dispersing the conductive agent in the lithium ion battery slurry according to claim 1, wherein the method comprises the following steps: the adhesive is polyvinylidene fluoride, and the molecular weight of the adhesive is 90-130 ten thousand.
4. The method for dispersing the conductive agent in the lithium ion battery slurry according to claim 1, wherein the method comprises the following steps: the solvent is N-methyl pyrrolidone, the purity of the solvent is more than or equal to 99.9 percent, and the water content is less than or equal to 280 ppm.
5. The method for dispersing the conductive agent in the lithium ion battery slurry according to claim 1, wherein the method comprises the following steps: the stirring speed in the step (1) is 20-25rpm, the rotation speed is 1000-1200rpm, and the dispersion time is 180-240 min.
6. The method for dispersing the conductive agent in the lithium ion battery slurry according to claim 1, wherein the method comprises the following steps: the stirring speed revolution in the step (2) is 20-25rpm, the rotation is 1100-1300rpm, and the dispersion time is 10-20 min.
7. The method for dispersing the conductive agent in the lithium ion battery slurry according to claim 1, wherein the method comprises the following steps: the rotating speed of the radial-flow high-shear homogenizer in the step (3) is 2100-2300rpm, and the dispersion time is 15-25 min.
8. The method for dispersing the conductive agent in the lithium ion battery slurry according to claim 1, wherein the method comprises the following steps: the stirring speed revolution in the step (4) is 20-25rpm, the rotation is 1100-1300rpm, and the dispersion time is 10-20 min.
9. The method for dispersing the conductive agent in the lithium ion battery slurry according to claim 1, wherein the method comprises the following steps: the stirring speed in the step (5) is converted into 25-30rpm, the rotation speed is 1200-1400rpm, and the dispersion time is 180-240 min.
10. The lithium ion battery slurry prepared by the method for dispersing the conductive agent in the lithium ion battery slurry according to claim 1 is characterized by comprising an active material, a conductive agent, a binder and a solvent, wherein the components are as follows in percentage by weight: 45.5-53.3% of active material, 0.8-1.2% of conductive agent, 0.9-1.2% of binder and 44.3-52.8% of solvent.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203196566U (en) * | 2013-01-28 | 2013-09-18 | 石家庄福润达化工有限公司 | Circular disc turbine agitator |
| CN203589133U (en) * | 2013-12-02 | 2014-05-07 | 北京国能电池科技有限公司 | Lithium battery pole piece production facility and slurry nanocrystallization device thereof |
| CN105870454A (en) * | 2016-06-03 | 2016-08-17 | 田东 | Application method of graphene as conductive agent to positive electrode slurry of lithium ion battery |
| CN107611375A (en) * | 2017-08-21 | 2018-01-19 | 深圳拓邦股份有限公司 | A kind of preparation method of lithium ion battery anode glue size |
| CN212387009U (en) * | 2020-05-16 | 2021-01-22 | 李吉翔 | Add hot type stirring and add thick liquid confession fluid reservoir |
-
2021
- 2021-12-23 CN CN202111584896.9A patent/CN114420930A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203196566U (en) * | 2013-01-28 | 2013-09-18 | 石家庄福润达化工有限公司 | Circular disc turbine agitator |
| CN203589133U (en) * | 2013-12-02 | 2014-05-07 | 北京国能电池科技有限公司 | Lithium battery pole piece production facility and slurry nanocrystallization device thereof |
| CN105870454A (en) * | 2016-06-03 | 2016-08-17 | 田东 | Application method of graphene as conductive agent to positive electrode slurry of lithium ion battery |
| CN107611375A (en) * | 2017-08-21 | 2018-01-19 | 深圳拓邦股份有限公司 | A kind of preparation method of lithium ion battery anode glue size |
| CN212387009U (en) * | 2020-05-16 | 2021-01-22 | 李吉翔 | Add hot type stirring and add thick liquid confession fluid reservoir |
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