CN108281640B - Batching process of lithium ion battery anode slurry, lithium ion battery anode plate and lithium ion battery - Google Patents
Batching process of lithium ion battery anode slurry, lithium ion battery anode plate and lithium ion battery Download PDFInfo
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- CN108281640B CN108281640B CN201810099586.XA CN201810099586A CN108281640B CN 108281640 B CN108281640 B CN 108281640B CN 201810099586 A CN201810099586 A CN 201810099586A CN 108281640 B CN108281640 B CN 108281640B
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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
- H01M4/364—Composites as mixtures
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- H—ELECTRICITY
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- 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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
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- 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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- H—ELECTRICITY
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- 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
- 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
- H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
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- 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 belongs to the technical field of lithium ion batteries, and relates to a proportioning process of lithium ion battery anode slurry, a lithium ion battery anode plate and a lithium ion battery. The invention discloses a batching process of lithium ion battery anode slurry, which comprises the following steps: (a) dry-mixing the positive active substance, the conductive additive, the dispersant and the thickener to obtain mixed powder; (b) adding a solvent, and uniformly mixing to obtain primary slurry with the solid content of 82-85 wt%; (c) adding a solvent, and uniformly mixing to obtain secondary slurry with the solid content of 66-68 wt%; (d) and adding a solvent, and uniformly mixing to obtain the third-level slurry with the solid content of 56-59 wt%, thereby preparing the lithium ion battery anode slurry. The invention has simple process and easy operation, can obviously shorten the batching time, improve the utilization rate of equipment, simultaneously mix materials uniformly, and improve the dispersibility, consistency and fineness of the slurry.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a proportioning process of lithium ion battery anode slurry, a lithium ion battery anode plate and a lithium ion battery.
Background
In the existing secondary battery system, the lithium ion battery is the most competitive secondary battery at present, both from the viewpoint of development space and from the viewpoint of technical indexes such as service life, specific energy, operating voltage and self-discharge rate. The lithium ion battery has the advantages of high working voltage, high energy density, long cycle life, small self-discharge rate, environmental protection and the like, and becomes a development trend of secondary batteries; the power supply has been widely applied to power supplies of portable electrical appliances such as wireless communication, digital cameras, notebook computers and the like, and has wide application prospect in the aspect of being used as the power supply in special application fields such as aerospace, national defense and military industry, electric automobiles, electric motorcycles, field work, submarines and the like.
The preparation of the slurry is a key process in the production link of the lithium ion battery, and the performance of the electrode slurry has important influence on the performance of the lithium ion battery. The more evenly the components in the electrode slurry are dispersed, the better the processing performance of the pole piece is, the more evenly the impedance distribution at each position of the electrode is, the larger the function of the active substance can be played during charging and discharging, and the performance of the battery can be improved.
The traditional preparation of the anode slurry mostly adopts wet mixing, and the method has the advantages of long required time, low equipment utilization rate, relatively low productivity, and poor slurry dispersibility and consistency. The recently emerging dry blending process has become a focus of research that can improve dispersion and production efficiency. However, the existing dry mixing process still needs a long time, the whole batching process needs ten hours or more, the production efficiency is low, and the utilization rate of equipment is low; in addition, during slurry mixing, the general solid content of the slurry is low or high, which is not beneficial to the improvement of the dispersibility and consistency of the slurry and the improvement of the overall performance of the finally prepared positive pole piece.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a batching process of lithium ion battery anode slurry, which is simple in process and easy to operate, can obviously shorten batching time, improve equipment utilization rate, uniformly mix materials and effectively improve the dispersibility, consistency and fineness of the slurry.
The second purpose of the invention is to provide a lithium ion battery positive plate which has the advantages of good uniformity, strong stability, high qualification rate, good cycle stability, high safety and low cost.
The third purpose of the invention is to provide a lithium ion battery, which comprises the lithium ion battery positive plate and has the advantages of good cycle stability, high safety and low cost.
In order to achieve the purpose, the invention adopts the technical scheme that:
according to one aspect of the invention, the invention provides a batching process of lithium ion battery anode slurry, which comprises the following steps:
(a) dry-mixing the positive active substance, the conductive additive, the dispersant and the thickener to obtain mixed powder;
(b) adding a solvent, and uniformly mixing to obtain primary slurry with the solid content of 82-85 wt%;
(c) adding a solvent, and uniformly mixing to obtain secondary slurry with the solid content of 66-68 wt%;
(d) and adding a solvent, and uniformly mixing to obtain the third-level slurry with the solid content of 56-59 wt%, thereby preparing the lithium ion battery anode slurry.
In a further preferable technical scheme, in the step (a), the dry mixing and stirring speed is revolution at 15-25 r/min, and the time is 25-35 min.
In a further preferable technical scheme, in the step (b), the mixture is firstly mixed and stirred at the speed of 15-25 r/min of revolution for 8-15 min, and then mixed and stirred at the speed of 30-45 r/min of revolution for 110-130 min.
In a further preferable technical scheme, in the step (c), the mixture is firstly mixed and stirred for 8-15 min at the speed of 15-25 r/min in a revolution manner, and then mixed and stirred for 60-100 min at the speed of 30-45 r/min in a revolution manner and 800-1500 r/min in a rotation manner.
In a further preferable technical scheme, in the step (d), the mixture is firstly mixed and stirred for 8-15 min at the speed of 15-25 r/min in a revolution manner, and then mixed and stirred for 25-40 min at the speed of 30-45 r/min in a revolution manner and 800-1500 r/min in a rotation manner.
And as a further preferable technical scheme, the method further comprises a step of defoaming, wherein after the third-level slurry is obtained, defoaming is carried out for 25-35 min at the speed of revolution of 25-35 r/min, and the lithium ion battery anode slurry is prepared.
As a further preferable technical scheme, the solid content of the primary slurry is 83-84 wt%; the solid content of the secondary slurry is 67-68 wt%; the solid content of the third-stage slurry is 57-58 wt%.
According to a further preferable technical scheme, in the lithium ion battery anode slurry, the mass ratio of an anode active substance to a conductive auxiliary agent to a dispersing agent to a thickening agent is (94-97): (0.8-1.5): (0.08-0.15): (1-3);
preferably, the positive electrode active material includes lithium iron phosphate;
preferably, the conductive auxiliary agent comprises at least one of conductive carbon black, conductive carbon spheres, conductive graphite, carbon nanotubes, conductive carbon fibers or graphene;
preferably, the dispersant comprises at least one of polyethylene glycol and polyvinylpyrrolidone;
preferably, the thickener comprises CMC;
preferably, the solvent comprises NMP.
According to another aspect of the invention, the invention further provides a lithium ion battery positive plate, which comprises a positive current collector and an active material layer formed on the surface of the positive current collector, wherein the slurry of the active material layer is prepared by adopting the above proportioning process of the lithium ion battery positive slurry.
According to another aspect of the invention, the invention also provides a lithium ion battery, which comprises the lithium ion battery positive plate.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the batching process of the lithium ion battery anode slurry, the slurry with uniform dispersion and good quality is prepared by adopting a dry mixing mode and a solvent adding mode for three times, the batching can be carried out in a solid content fixing mode, the batching time is shortened, a better mixing effect is obtained, the dispersion uniformity and the stability of the slurry are improved, and the technical problems of long batching time, easiness in agglomeration and difficulty in uniform mixing in the prior art are solved.
2. The invention is simple and easy to operate, does not need special auxiliary equipment, is convenient to operate, greatly improves the utilization rate of equipment, improves the production efficiency, reduces the cost, improves the quality of pole pieces, ensures the consistency of battery performance and is easy to realize industrial large-scale production due to short batching time, uniform mixing and improved fineness of slurry.
3. The invention has the advantages of short production time and high economic efficiency, and the slurry is mixed very uniformly and is not easy to precipitate, thereby avoiding the occurrence of agglomeration phenomenon, improving the performance of the slurry and leading the slurry to have good uniformity, stability and dispersibility; therefore, the slurry drawing can be smoothly carried out when the positive plate is prepared, the qualified rate of the positive plate is high, the coating uniformity is improved, and the overall performance of the finally prepared positive plate is obviously improved. Furthermore, the positive pole piece is applied to the lithium ion battery, so that the stability and consistency of the battery can be improved, the prepared lithium ion battery has better cycle stability, can exert higher capacity, has good safety performance, and prolongs the service life of the lithium ion battery.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to embodiments and examples, but those skilled in the art will understand that the following embodiments and examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Those who do not specify the conditions are performed according to the conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
In a first aspect, in at least one embodiment, there is provided a process for dosing a lithium ion battery positive electrode slurry, comprising the steps of:
(a) dry-mixing the positive active substance, the conductive additive, the dispersant and the thickener to obtain mixed powder;
(b) adding a solvent, and uniformly mixing to obtain primary slurry with the solid content of 82-85 wt%;
(c) adding a solvent, and uniformly mixing to obtain secondary slurry with the solid content of 66-68 wt%;
(d) and adding a solvent, and uniformly mixing to obtain the third-level slurry with the solid content of 56-59 wt%, thereby preparing the lithium ion battery anode slurry.
The invention adopts the mode of dry mixing and adding the solvent for three times to prepare the slurry with uniform dispersion and good quality, and can realize the mode of fixing solid content for proportioning, thereby shortening the proportioning time, obtaining better mixing effect, and improving the dispersion uniformity and stability of the slurry, in particular to:
dry mixing dry powders of the positive active substance, the conductive additive, the dispersant and the thickener for a period of time, adding part of solvent to control the solid content to be about 82 wt% -85 wt% so as to achieve a dough kneading state, wherein the state is the state which can most enable the dry powders to be uniformly mixed, and mixing and stirring the dry powders for a period of time; adding partial solvent to reduce the solid content to about 66 wt% -68 wt%, and fully mixing the slurry and the solvent in a wet mixing state; after mixing and stirring for a period of time, adding a part of solvent to reduce the solid content to about 56-59 wt%, testing the viscosity, and adjusting the viscosity to the range of technological requirements; then removing bubbles or adjusting viscosity to meet the requirement of coating viscosity.
The dry mixing is to add the positive active substance, the conductive auxiliary agent, the dispersing agent and the thickening agent at one time under the condition of no other solvent, directly mix and stir, and obtain better mixing effect, so that the batching time can be shortened, the slurry is more uniform, and the large particle content of the slurry is reduced; the thickening and dispersing effects of the thickener and the dispersant can be fully exerted. In addition, the solvent is added step by step, the range of solid content in each step is effectively controlled, the solubility of the conductive additive is improved, the probability that small-particle powder aggregates in the solvent to form large particles is reduced, the particle size of the anode slurry is small, the anode slurry is easy to disperse and stabilize, the conductive efficiency of the anode plate can be improved, and the electrochemical performance of the battery can be improved. And finally, defoaming or viscosity adjustment is carried out to form slurry with uniform dispersion, good stability and good consistency, so that the consistency of the battery performance is ensured while the slurry preparation efficiency is improved.
The solid content may be understood in the conventional sense in the art, and for example, the solid content may be understood as the mass percentage of the total solid matter based on the total amount of the slurry.
Optionally, in the operation process, the positive active material, the conductive additive, the dispersant and the thickener are weighed according to the mass ratio and are subjected to dry mixing; and then sequentially adding the solvents with the solid contents of 82-85 wt%, 66-68 wt% and 56-59 wt% according to the mass ratio, and sequentially mixing and stirring to prepare the anode slurry.
In a preferred embodiment, in the step (a), the dry mixing and stirring speed is revolution at 15-25 r/min, rotation at 0r/min, and time at 25-35 min;
preferably, the dry mixing and stirring speed is 15-20 r/min of revolution, the rotation speed is 0r/min of rotation, and the time is 28-32 min;
further preferably, the dry-mixing stirring speed is 20r/min in revolution, 0r/min in rotation, and the time is 30 min.
The dry blending is carried out under the above conditions, that is, when the rotation speed during the dry blending is within the above range, the respective substances can be more sufficiently mixed, the thickening and dispersing effects of the thickener and the dispersant can be sufficiently exerted, a good mixing effect can be obtained, and the reduction of man-hours can be facilitated.
The temperature in the dry blending process is not particularly limited, and may be, for example, 15 ℃ or more and 35 ℃ or less.
The mixer used in the dry mixing process is not particularly limited, and may be, for example, a planetary motion mixer or a planetary motion planetary mixer.
In a preferred embodiment, in the step (b), the mixture is mixed and stirred for 8-15 min at the speed of revolution of 15-25 r/min and rotation of 0r/min, and then mixed and stirred for 110-130 min at the speed of revolution of 30-45 r/min and rotation of 0 r/min;
preferably, the mixture is mixed and stirred for 9-12 min at the speed of 15-20 r/min of revolution and 0r/min of rotation, and then mixed and stirred for 115-125 min at the speed of 30-35 r/min of revolution and 0r/min of rotation;
more preferably, the mixture is first mixed and stirred at a speed of 20r/min revolution and 0r/min rotation for 10min, and then mixed and stirred at a speed of 35r/min revolution and 0r/min rotation for 120 min.
Kneading under the above conditions, that is, when the rotation speed during kneading is within the above range, the respective substances can be more sufficiently mixed, a better mixing effect can be obtained, and the dispersion and stability of the positive electrode slurry can be improved.
The temperature of the kneading process of the dough is not particularly limited, and may be, for example, 18 ℃ or more and 35 ℃ or less.
The mixer used in the kneading process of the dough is not particularly limited, and may be, for example, a planetary motion mixer, a planetary motion planetary mixer, or the like.
In a preferred embodiment, in the step (c), the mixture is mixed and stirred for 8-15 min at the speed of revolution of 15-25 r/min and rotation of 0r/min, and then mixed and stirred for 60-100 min at the speed of revolution of 30-45 r/min and rotation of 800-1500 r/min;
preferably, the mixture is mixed and stirred for 9-12 min at the speed of 15-20 r/min revolution and 0r/min rotation, and then mixed and stirred for 60-90 min at the speed of 30-35 r/min revolution and 900-1200 r/min rotation;
more preferably, the mixture is first mixed and stirred at a speed of 20r/min revolution and 0r/min rotation for 10min, and then mixed and stirred at a speed of 35r/min revolution and 1000r/min rotation for 90 min.
The wet mixing is performed under the above conditions, that is, when the rotation speed during the wet mixing is within the above range, the respective substances can be more sufficiently mixed, so that the slurry and the solvent are sufficiently mixed, a better mixing effect is obtained, and the dispersibility, stability and consistency of the positive electrode slurry can be improved.
The temperature in the wet mixing process is not particularly limited, and may be, for example, 18 ℃ or more and 35 ℃ or less.
The mixer used in the wet mixing process is not particularly limited, and may be, for example, a planetary motion mixer or a planetary motion planetary mixer.
In a preferred embodiment, in the step (d), the mixture is mixed and stirred for 8-15 min at the speed of revolution of 15-25 r/min and rotation of 0r/min, and then mixed and stirred for 25-40 min at the speed of revolution of 30-45 r/min and rotation of 800-1500 r/min;
preferably, the mixture is mixed and stirred for 9-12 min at the speed of 15-20 r/min revolution and 0r/min rotation, and then mixed and stirred for 28-35 min at the speed of 30-35 r/min revolution and 900-1200 r/min rotation;
more preferably, the mixture is first mixed and stirred at a speed of 20r/min revolution and 0r/min rotation for 10min, and then mixed and stirred at a speed of 35r/min revolution and 1000r/min rotation for 30 min.
The viscosity is adjusted by dilution under the above conditions, that is, when the rotation speed during the adjustment of the viscosity by dilution is within the above range, the respective substances can be more sufficiently mixed, a better mixing effect can be obtained, the adjustment of the viscosity is facilitated, and the dispersibility, the storage stability and the consistency of the positive electrode slurry can be improved.
The temperature during the dilution to adjust the viscosity is not particularly limited, and may be, for example, 18 ℃ or more and 35 ℃ or less.
The mixer used in the process of dilution viscosity adjustment is not particularly limited, and may be, for example, a planetary motion mixer or a planetary motion planetary mixer.
In a preferred embodiment, the method further comprises a step of defoaming, wherein after the three-stage slurry is obtained, defoaming is carried out for 25-35 min at the speed of revolution of 25-35 r/min, and the lithium ion battery anode slurry is prepared.
Preferably, the defoaming speed is 25-30 r/min of revolution, the autorotation is 0r/min, and the time is 28-32 min;
further preferably, the speed of defoaming is revolution at 30r/min, and rotation at 0r/min for 30 min.
The defoaming is carried out under the conditions, so that the mixing is more uniform, and the slurry has better electrical property and coating effect.
The temperature and pressure for defoaming are not particularly limited, and for example, vacuum defoaming is possible, and the temperature may be 20 ℃ or higher and 35 ℃ or lower.
Under the operating conditions, the batching time can be obviously shortened, compared with the existing batching time of 8-10 hours, the batching time is shortened to 4-5 hours, and the production efficiency is improved by 2 times.
In a preferred embodiment, the solids content of the primary slurry is between 83 wt% and 84 wt%; the solid content of the secondary slurry is 67-68 wt%; the solid content of the third-stage slurry is 57-58 wt%;
preferably, the solids content of the primary slurry is around 84 wt%; the solid content of the secondary slurry is about 67 wt%; the solid content of the third-stage slurry is about 58 wt%.
By effectively controlling or fixing the solid content of the slurry in each step, namely when the solid content of each step is in the range, the method is favorable for improving the uniform mixing degree of the slurry in each step, is also favorable for improving the solubility of the conductive auxiliary agent, reduces the probability that small particle powder is easy to agglomerate in a solvent to form large particles, improves the fineness of the slurry, improves the performance of the slurry, and ensures the good performances of the lithium ion battery, such as circulation, multiplying power, safety, consistency and the like.
In a preferred embodiment, in the lithium ion battery positive electrode slurry, the mass ratio of the positive electrode active material, the conductive auxiliary agent, the dispersant and the thickener is (94-97): (0.8-1.5): (0.08-0.15): (1-3);
preferably, the positive electrode active material includes lithium iron phosphate;
preferably, the conductive auxiliary agent comprises at least one of conductive carbon black, conductive carbon spheres, conductive graphite, carbon nanotubes, conductive carbon fibers or graphene;
preferably, the dispersant comprises at least one of polyethylene glycol and polyvinylpyrrolidone;
preferably, the thickener comprises CMC;
preferably, the solvent comprises NMP.
The ratio of each substance in the paste is not excessively limited as long as the addition amount of each substance satisfies the balance between coatability and adhesive property of the paste; for example, the mass ratio of the positive electrode active material to the conductive auxiliary agent to the dispersant to the thickener is (94-97): (0.8-1.5): (0.08-0.15): (1-3); the mass ratio of the positive active material to the conductive auxiliary agent to the dispersing agent to the thickening agent is (94.5-96.5): (1.0-1.2): (0.1-0.12): (1.5-2); in the preparation process, the substances are added according to the actual required proportion, and the solvent content in the slurry can be added according to the solid content determined in each step.
Optionally, the viscosity of the prepared positive electrode slurry is 2000-8000 mPa. During the operation, the viscosity of the slurry can be tested, and the viscosity can be adjusted by adjusting the addition amount of the solvent to the process requirement range.
It is to be understood that the present invention is not particularly limited with respect to the sources of the respective positive electrode active materials, solvents, thickeners, conductive aids, and dispersants, and various raw materials well known to those skilled in the art may be used; if it is commercially available, it can be prepared by itself by a method known to those skilled in the art.
The following further description is made for each constituent material in the slurry:
positive electrode active material: the positive electrode active material is not particularly limited as long as the active material is a typical active material that can be used for a positive electrode of a lithium ion secondary battery. The positive electrode active material is preferably lithium iron phosphate.
Conductive auxiliary agent: the conductive aid is not particularly limited as long as the conductive aid has electron conductivity and improves the conductivity of the electrode. The conductive aid includes a carbon material, and the conductive aid may be, for example, conductive carbon black, acetylene black, ketjen black, conductive carbon spheres, conductive graphite, carbon nanotubes, conductive carbon fibers, or graphene, and graphite having a smaller particle size than that of graphite of the active material, and these conductive aids may be used alone or in combination of two or more of them.
Dispersing agent: the dispersant is not particularly limited as long as the dispersant is used to improve the dispersion uniformity and coatability of the positive electrode slurry. The dispersant may be, for example, polyethylene glycol, polyvinylpyrrolidone, etc., wherein the polyethylene glycol may include polyethylene glycol 200, polyethylene glycol 400, polyethylene glycol 600, polyethylene glycol 1000, etc., and the polyvinylpyrrolidone may include polyvinylpyrrolidone K15, polyvinylpyrrolidone K30, polyvinylpyrrolidone K40, polyvinylpyrrolidone K60, etc.; these dispersants may be used alone or in combination of two or more of them.
Thickening agent: the thickener is not particularly limited as long as the thickener is used to improve coatability of the positive electrode slurry. The thickener includes a water-soluble polymer, and may be, for example, a cellulose-based polymer such as carboxymethyl cellulose, methyl cellulose, and hydroxypropyl cellulose, and ammonium salts and metal salts thereof. The thickener is preferably Sodium carboxymethylcellulose (CMC), which is white or yellowish fibrous powder or white powder in appearance, and has no odor, no toxicity, wide source and low cost.
Solvent: the solvent is not particularly limited as long as the above-mentioned substance can be dissolved, contributing to the improvement of the dispersibility of the thickener, and not hindering the contact between the active material and the conductive assistant. The solvent, for example, can be N-methyl pyrrolidone, namely NMP (N-methyl-2-pyrrolidone), and has the characteristics of low viscosity, good chemical stability and thermal stability, low volatility, low cost, wide sources and good fluidity of the prepared slurry.
In a second aspect, in at least one embodiment, a lithium ion battery positive plate is provided, which includes a positive current collector and an active material layer formed on the surface of the positive current collector, and a slurry of the active material layer is prepared by using the above-mentioned formulation process of the lithium ion battery positive slurry.
In a third aspect, in at least one embodiment, there is provided a lithium ion battery comprising the above-described lithium ion battery positive electrode sheet. The lithium ion battery also comprises a negative plate, a diaphragm and electrolyte.
It is to be understood that the present invention is not particularly limited with respect to specific types of the positive electrode current collector, the negative electrode tab, the separator, and the electrolyte, and may be conventionally selected in the art.
The formation method of the active material layer formed on the surface of the positive electrode current collector is not particularly limited, and the obtained slurry may be coated by a conventional coating process.
The positive pole slurry prepared by the method has good uniformity, stability and dispersibility, the fineness of the slurry is improved, the uniformity of a coating process can be improved, the technical problems that cracks are easy to occur in the coating process of a battery pole piece and the qualified rate of the pole piece is low in the prior art are solved, and the overall performance of the finally prepared positive pole piece is improved. Furthermore, the positive plate is applied to the lithium ion battery, so that the stability and consistency of the battery can be improved, the prepared lithium ion battery has better cycle stability, higher capacity, good safety performance and high rate performance, the service life of the lithium ion battery is prolonged, and the application range of the lithium ion battery is expanded.
The present invention will be further described with reference to specific examples and comparative examples.
Example 1
A batching process of lithium ion battery anode slurry comprises the following steps:
(a) calculating and weighing the lithium iron phosphate, the conductive carbon black, the polyethylene glycol and the CMC according to the mass ratio, and performing dry mixing for 30min at the speed of revolution of 20r/min and rotation of 0r/min to obtain mixed powder;
(b) adding NMP, mixing and stirring for 10min at the speed of revolution of 20r/min and rotation of 0r/min, and then mixing and stirring for 120min at the speed of revolution of 35r/min and rotation of 0r/min to obtain primary slurry with the solid content of 83.8 wt%, wherein the adding amount of the NMP is 83.8 wt%;
(c) then adding NMP, mixing and stirring for 10min at the speed of revolution of 20r/min and rotation of 0r/min, and then mixing and stirring for 90min at the speed of revolution of 35r/min and rotation of 1000r/min to obtain secondary slurry with the solid content of 67.4 wt%, wherein the adding amount of the NMP is calculated according to the solid content of 67.4 wt%;
(d) then adding NMP, mixing and stirring for 10min at the speed of revolution of 20r/min and rotation of 0r/min, and then mixing and stirring for 30min at the speed of revolution of 35r/min and rotation of 1000r/min to obtain three-stage slurry with the solid content of 57.9 wt%, wherein the adding amount of the NMP is calculated according to the solid content of 57.9 wt%;
then stirring for 30min at the speed of revolution of 30r/min and rotation of 0r/min to remove bubbles, and obtaining the anode slurry of the lithium ion battery;
wherein the mass ratio of the lithium iron phosphate to the conductive carbon black to the polyethylene glycol to the CMC is 96.9: 1.0: 0.1: 2.
example 2
A batching process of lithium ion battery anode slurry comprises the following steps:
(a) calculating and weighing the lithium iron phosphate, the conductive carbon black, the polyethylene glycol and the CMC according to the mass ratio, and performing dry mixing for 35min at the speed of revolution of 20r/min and rotation of 0r/min to obtain mixed powder;
(b) adding NMP, mixing and stirring for 12min at the speed of revolution of 20r/min and rotation of 0r/min, and then mixing and stirring for 115min at the speed of revolution of 35r/min and rotation of 0r/min to obtain primary slurry with the solid content of 83 wt%, wherein the adding amount of the NMP is 83 wt%;
(c) then adding NMP, mixing and stirring for 15min at the speed of revolution of 20r/min and rotation of 0r/min, and then mixing and stirring for 60min at the speed of revolution of 35r/min and rotation of 1000r/min to obtain secondary slurry with the solid content of 67 wt%, wherein the adding amount of the NMP is calculated according to the solid content of 67 wt%;
(d) then adding NMP, mixing and stirring for 8min at the speed of revolution of 20r/min and rotation of 0r/min, and then mixing and stirring for 40min at the speed of revolution of 35r/min and rotation of 1000r/min to obtain three-stage slurry with the solid content of 57 wt%, wherein the adding amount of the NMP is calculated according to the solid content of 57 wt%;
then stirring for 25min at the speed of revolution of 30r/min and rotation of 0r/min to remove bubbles, and obtaining the anode slurry of the lithium ion battery;
wherein the mass ratio of the lithium iron phosphate to the conductive carbon black to the polyethylene glycol to the CMC is 95.85: 1.5: 0.15: 2.5.
example 3
A batching process of lithium ion battery anode slurry comprises the following steps:
(a) calculating and weighing the lithium iron phosphate, the conductive carbon fibers, the polyvinylpyrrolidone and the CMC according to the mass ratio, and performing dry mixing for 30min at the speed of revolution of 25r/min and rotation of 0r/min to obtain mixed powder;
(b) adding NMP, mixing and stirring for 10min at the speed of 15r/min of revolution and 0r/min of rotation, and then mixing and stirring for 120min at the speed of 45r/min of revolution and 0r/min of rotation to obtain primary slurry with the solid content of 85 wt%, wherein the adding amount of the NMP is calculated according to the solid content of 85 wt%;
(c) then adding NMP, mixing and stirring for 10min at the speed of 15r/min revolution and 0r/min rotation, then mixing and stirring for 90min at the speed of 30r/min revolution and 1500r/min rotation to obtain secondary slurry with 68 wt% of solid content, wherein the adding amount of the NMP is calculated according to 68 wt% of solid content;
(d) then adding NMP, mixing and stirring for 10min at the speed of revolution of 25r/min and rotation of 0r/min, and then mixing and stirring for 30min at the speed of revolution of 45r/min and rotation of 800r/min to obtain three-stage slurry with the solid content of 59 wt%, wherein the adding amount of the NMP is calculated according to the solid content of 59 wt%;
then stirring for 35min at the speed of revolution of 25r/min and rotation of 0r/min to remove bubbles, and obtaining the anode slurry of the lithium ion battery;
wherein the mass ratio of the lithium iron phosphate to the conductive carbon fibers to the polyvinylpyrrolidone to the CMC is 95.72: 1.2: 0.08: 3.
example 4
The difference between the batching process of the lithium ion battery anode slurry and the embodiment 1 is as follows:
(b) adding NMP, mixing and stirring for 10min at the speed of 15r/min of revolution and 0r/min of rotation, and then mixing and stirring for 125min at the speed of 30r/min of revolution and 0r/min of rotation to obtain primary slurry with the solid content of 83.8 wt%, wherein the adding amount of the NMP is 83.8 wt%;
(c) then adding NMP, mixing and stirring for 10min at the speed of revolution of 25r/min and rotation of 0r/min, and then mixing and stirring for 80min at the speed of revolution of 40r/min and rotation of 1000r/min to obtain secondary slurry with the solid content of 67.4 wt%, wherein the adding amount of the NMP is calculated according to the solid content of 67.4 wt%;
(d) then adding NMP, mixing and stirring for 10min at the speed of revolution of 20r/min and rotation of 0r/min, then mixing and stirring for 25min at the speed of revolution of 30r/min and rotation of 1500r/min to obtain three-stage slurry with the solid content of 57.9 wt%, wherein the adding amount of the NMP is calculated according to the solid content of 57.9 wt%;
the rest is the same as in example 1.
Example 5
The difference between the batching process of the lithium ion battery anode slurry and the embodiment 1 is as follows:
the solids contents in steps (b), (c) and (d) were 82.1 wt%, 66.2 wt% and 56.0 wt%, respectively;
the rest is the same as in example 1.
Comparative example 1
The difference between the batching process of the lithium ion battery anode slurry and the embodiment 1 is as follows:
replacing steps (b), (c) and (d) with: adding NMP, and mixing and stirring for 150min at the speed of revolution of 35r/min and rotation of 1000r/min to obtain slurry with the solid content of 70 wt%, wherein the adding amount of the NMP is calculated according to the solid content of 70 wt%;
this comparative example differs from example 1 in that NMP is added all at once.
Comparative example 2
The difference between the batching process of the lithium ion battery anode slurry and the embodiment 1 is as follows:
the solids content in steps (b), (c) and (d) was 72 wt%, 62 wt% and 50 wt%, respectively;
this comparative example differs from example 1 in that the solids content in steps (b), (c) and (d) is outside the scope of the present invention.
Comparative example 3
The difference between the batching process of the lithium ion battery anode slurry and the embodiment 1 is as follows:
(a) calculating and weighing the lithium iron phosphate, the conductive carbon black, the polyethylene glycol and the CMC according to the mass ratio, and performing dry mixing for 40min at the speed of revolution of 35r/min and rotation of 0r/min to obtain mixed powder;
(b) adding NMP, mixing and stirring for 5min at the speed of 40r/min of revolution and 0r/min of rotation, and then mixing and stirring for 150min at the speed of 50r/min of revolution and 0r/min of rotation to obtain primary slurry with the solid content of 83.2 wt%, wherein the adding amount of the NMP is 83.2 wt% of the solid content;
(c) adding NMP, and mixing and stirring at the revolution speed of 20r/min and the rotation speed of 1500r/min for 120min to obtain secondary slurry with the solid content of 66.4 wt%, wherein the adding amount of the NMP is calculated according to the solid content of 66.4 wt%;
(d) adding NMP, and mixing and stirring for 60min at the speed of revolution of 20r/min and rotation of 500r/min to obtain three-stage slurry with the solid content of 57.5 wt%, wherein the adding amount of the NMP is 57.5 wt% of the solid content;
this comparative example differs from example 1 in that the rotation speed and the operating time of the individual steps are outside the scope of the protection of the present invention.
Performance testing
The positive electrode pastes prepared in examples 1 to 5 and comparative examples 1 to 3 were respectively tested for viscosity and fineness, wherein the fineness was measured by a fineness meter and the viscosity was measured by a type B viscometer at 20 ℃ for 3.4s－1Measured at a shear rate of (a); each slurry was then left open at room temperature for 3 days, and the viscosity of each slurry was measured again and the viscosity change rate was calculated by the following formula:
viscosity change rate (%) — (viscosity after standing for 3 days/viscosity before standing for 3 days-1) × 100;
coating the slurry obtained in each example and comparative example on copper foil, rolling and die-cutting to prepare a positive plate, winding the positive plate, a diaphragm and a negative plate, putting the positive plate into a shell, injecting liquid and sealing to prepare the lithium ion battery, wherein 10 batteries are taken in each example and comparative example, the capacity and the cycle life of each battery are tested, and the test results are shown in table 1.
Table 1 results of performance testing
As can be seen from Table 1, the performance of the slurry prepared in the embodiments 1 to 5 of the invention is obviously superior to that of the slurry prepared in the comparative examples 1 to 3, the fineness of the slurry of the anode is improved in the embodiments of the invention, the viscosity is good, the viscosity is in the process requirement range, the viscosity of the anode slurry prepared by the method of the invention is within 3 days, the viscosity change is very small, the properties of the original slurry are basically maintained, the sedimentation phenomenon cannot occur, and the performance of the slurry is more stable; and meanwhile, the prepared slurry is coated on a positive current collector to prepare a positive plate, and then the pole piece is prepared into the lithium ion battery according to the prior art.
In addition, as can be seen from the comparative analysis of comparative example 1 and example 1, the addition of the solvent at one time is not favorable for the mixing of the slurry, which results in the deterioration of the dispersibility and consistency of the slurry, the deterioration of the stability of the slurry and the easy occurrence of the sedimentation phenomenon; meanwhile, as can be seen from the comparative analysis of comparative examples 2 and 3 and example 1, changing the operation parameters such as solid content, rotation speed and time set in each step does not achieve the above effects, and the performance of the slurry obtained is lowered.
The results show that the batching process has good mixing effect, small slurry fineness, good stability and difficult sedimentation, improves the quality of pole pieces, ensures the consistency of battery performance, shortens the working time and improves the production efficiency.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A proportioning process of lithium ion battery anode slurry is characterized by comprising the following steps:
(a) dry-mixing the positive active substance, the conductive additive, the dispersant and the thickener to obtain mixed powder;
(b) adding a solvent, and uniformly mixing to obtain primary slurry with the solid content of 82-85 wt%;
(c) adding a solvent, and uniformly mixing to obtain secondary slurry with the solid content of 66-68 wt%;
(d) adding a solvent, and uniformly mixing to obtain a third-level slurry with the solid content of 56-59 wt%, thereby preparing the lithium ion battery anode slurry; in the step (a), the dry mixing and stirring speed is 15-25 r/min of revolution, and the time is 25-35 min; in the step (b), firstly, mixing and stirring at the speed of 15-25 r/min for 8-15 min, and then mixing and stirring at the speed of 30-45 r/min for 110-130 min; in the step (c), firstly, mixing and stirring are carried out for 8-15 min at the speed of 15-25 r/min in a revolution mode, and then mixing and stirring are carried out for 60-100 min at the speed of 30-45 r/min in a revolution mode and 800-1500 r/min in a rotation mode; in the step (d), firstly, mixing and stirring are carried out for 8-15 min at the speed of 15-25 r/min in a revolution mode, and then mixing and stirring are carried out for 25-40 min at the speed of 30-45 r/min in a revolution mode and 800-1500 r/min in a rotation mode; the method further comprises a step of defoaming, wherein after the third-level slurry is obtained, defoaming is carried out for 25-35 min at the speed of revolution of 25-35 r/min, and the lithium ion battery anode slurry is prepared;
the positive active material is lithium iron phosphate;
the conductive auxiliary agent is at least one of conductive carbon black, conductive carbon spheres, conductive graphite, carbon nano tubes, conductive carbon fibers or graphene;
the dispersing agent is at least one of polyethylene glycol and polyvinylpyrrolidone;
the thickening agent is CMC.
2. The compounding process of the lithium ion battery cathode slurry according to claim 1, wherein the solid content of the primary slurry is 83 wt% to 84 wt%; the solid content of the secondary slurry is 67-68 wt%; the solid content of the third-stage slurry is 57-58 wt%.
3. The proportioning process of the lithium ion battery anode slurry according to claim 1, wherein the mass ratio of the anode active material, the conductive auxiliary agent, the dispersing agent and the thickening agent in the lithium ion battery anode slurry is (94-97): (0.8-1.5): (0.08-0.15): (1-3).
4. The process of compounding a lithium ion battery positive electrode slurry according to claim 1, wherein the solvent comprises NMP.
5. A lithium ion battery positive plate comprises a positive current collector and an active material layer formed on the surface of the positive current collector, and is characterized in that slurry of the active material layer is prepared by the batching process of the lithium ion battery positive slurry according to any one of claims 1 to 4.
6. A lithium ion battery comprising the positive electrode sheet according to claim 5.
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| CN113546533A (en) * | 2021-06-30 | 2021-10-26 | 惠州锂威新能源科技有限公司 | Preparation method of glue solution and product thereof |
| CN113823762B (en) * | 2021-09-16 | 2023-07-28 | 湖北亿纬动力有限公司 | Mixing method of negative electrode slurry, battery preparation method and application |
| CN114220970B (en) * | 2021-12-14 | 2023-06-02 | 芜湖天弋能源科技有限公司 | Lithium ion battery anode slurry and preparation method thereof |
| CN114497561A (en) * | 2021-12-29 | 2022-05-13 | 天津先众新能源科技股份有限公司 | Positive electrode conductive additive for rate start battery and preparation method thereof |
| CN114864871B (en) * | 2022-03-31 | 2024-04-02 | 湖北亿纬动力有限公司 | Positive electrode slurry and preparation method and application thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101740757A (en) * | 2010-01-11 | 2010-06-16 | 东莞市金源电池科技有限公司 | Synthetic method of lithium iron phosphate sizing agent |
| CN101872856A (en) * | 2010-06-13 | 2010-10-27 | 深圳市山木电池科技有限公司 | Lithium iron phosphate battery positive electrode pulp, lithium iron phosphate battery using positive electrode pulp and preparation method thereof |
| CN104638229A (en) * | 2015-01-30 | 2015-05-20 | 上海航天电源技术有限责任公司 | Dry-blending hard-melting preparation method for electrode slurry of automobile power lithium ion battery |
| CN104681790A (en) * | 2013-11-27 | 2015-06-03 | 万向A一二三***有限公司 | Lithium-ion power battery positive electrode material slurry preparation method |
| CN104766949A (en) * | 2014-01-08 | 2015-07-08 | 中山天贸电池有限公司 | Processing method of lithium ion battery negative electrode slurry |
| CN104993120A (en) * | 2015-06-18 | 2015-10-21 | 田东 | Lithium ion battery negative electrode sizing agent and preparation method thereof |
| CN106654153A (en) * | 2016-12-16 | 2017-05-10 | 东莞市创明电池技术有限公司 | Slurry for lithium-ion battery and slurry synthesizing method |
-
2018
- 2018-01-31 CN CN201810099586.XA patent/CN108281640B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101740757A (en) * | 2010-01-11 | 2010-06-16 | 东莞市金源电池科技有限公司 | Synthetic method of lithium iron phosphate sizing agent |
| CN101872856A (en) * | 2010-06-13 | 2010-10-27 | 深圳市山木电池科技有限公司 | Lithium iron phosphate battery positive electrode pulp, lithium iron phosphate battery using positive electrode pulp and preparation method thereof |
| CN104681790A (en) * | 2013-11-27 | 2015-06-03 | 万向A一二三***有限公司 | Lithium-ion power battery positive electrode material slurry preparation method |
| CN104766949A (en) * | 2014-01-08 | 2015-07-08 | 中山天贸电池有限公司 | Processing method of lithium ion battery negative electrode slurry |
| CN104638229A (en) * | 2015-01-30 | 2015-05-20 | 上海航天电源技术有限责任公司 | Dry-blending hard-melting preparation method for electrode slurry of automobile power lithium ion battery |
| CN104993120A (en) * | 2015-06-18 | 2015-10-21 | 田东 | Lithium ion battery negative electrode sizing agent and preparation method thereof |
| CN106654153A (en) * | 2016-12-16 | 2017-05-10 | 东莞市创明电池技术有限公司 | Slurry for lithium-ion battery and slurry synthesizing method |
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