CN113013372A - Preparation method of aqueous anode and cathode slurry of lithium ion battery - Google Patents
Preparation method of aqueous anode and cathode slurry of lithium ion battery Download PDFInfo
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- CN113013372A CN113013372A CN202110198046.9A CN202110198046A CN113013372A CN 113013372 A CN113013372 A CN 113013372A CN 202110198046 A CN202110198046 A CN 202110198046A CN 113013372 A CN113013372 A CN 113013372A
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- conductive agent
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 60
- 238000002360 preparation method Methods 0.000 title claims abstract description 38
- 239000006256 anode slurry Substances 0.000 title claims abstract description 28
- 239000006257 cathode slurry Substances 0.000 title claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 183
- 239000006258 conductive agent Substances 0.000 claims abstract description 109
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 84
- 239000013543 active substance Substances 0.000 claims abstract description 81
- 239000011230 binding agent Substances 0.000 claims abstract description 57
- 239000012153 distilled water Substances 0.000 claims abstract description 46
- 239000002270 dispersing agent Substances 0.000 claims abstract description 35
- 239000003960 organic solvent Substances 0.000 claims abstract description 34
- 239000002562 thickening agent Substances 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 33
- 239000002002 slurry Substances 0.000 claims abstract description 16
- 239000011259 mixed solution Substances 0.000 claims description 96
- 238000002156 mixing Methods 0.000 claims description 20
- 239000011267 electrode slurry Substances 0.000 claims description 18
- 238000001914 filtration Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 10
- 238000002203 pretreatment Methods 0.000 claims description 10
- 239000002003 electrode paste Substances 0.000 claims description 9
- 239000007774 positive electrode material Substances 0.000 claims description 9
- 239000006183 anode active material Substances 0.000 claims description 5
- 239000007773 negative electrode material Substances 0.000 description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical group CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 8
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical group [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 8
- 239000001768 carboxy methyl cellulose Substances 0.000 description 8
- 229910002804 graphite Inorganic materials 0.000 description 8
- 239000010439 graphite Substances 0.000 description 8
- 229920002239 polyacrylonitrile Polymers 0.000 description 8
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 8
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 8
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 8
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 8
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 8
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 4
- 229910021382 natural graphite Inorganic materials 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009775 high-speed stirring Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F31/00—Mixers with shaking, oscillating, or vibrating mechanisms
- B01F31/70—Drives therefor, e.g. crank mechanisms
-
- 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
-
- 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
- H01M10/058—Construction or manufacture
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a preparation method of aqueous anode and cathode slurry of a lithium ion battery, which comprises the following steps: 1) the lithium ion battery aqueous anode slurry comprises 1-2 parts of aqueous binder, 6-8 parts of distilled water, 2-4 parts of anode conductive agent, 1-3 parts of anode active substance, 0.5-0.8 part of dispersant, 70-80 parts of organic solvent and 3-8 parts of thickener, 2) the lithium ion battery aqueous cathode slurry comprises 2-3 parts of aqueous binder, 7-8 parts of distilled water, 3-5 parts of cathode conductive agent, 0.8-1.5 parts of cathode active substance, 0.2-0.7 part of dispersant, 75-85 parts of organic solvent and 2-4 parts of thickener, the lithium ion battery aqueous anode and cathode slurry prepared by the method has uniform texture, meanwhile, the vibrating motor is utilized to drive the stirring barrel of the stirring machine to vibrate, so that bubbles in the slurry can be discharged conveniently, and the quality of the lithium ion battery aqueous anode and cathode slurry is ensured.
Description
Technical Field
The invention relates to the technical field of lithium battery slurry, in particular to a preparation method of aqueous anode and cathode slurry of a lithium ion battery.
Background
The lithium ion battery is used as a novel energy source with high voltage, high specific energy, long cycle life, environmental protection and no pollution, and is widely applied to portable electronic equipment, electric vehicles and energy storage equipment. With the increasing share of lithium ion batteries in the new energy market, researchers of lithium ion battery technology are increasing, and the requirements on the performance and safety of the lithium ion batteries are also increasing. Among them, the uniformity and stability of the electrode slurry have a great influence on the performance of the lithium ion battery. For a lithium ion battery, it is mainly composed of a positive electrode, a negative electrode, and a separator. Wherein the negative electrode comprises a copper foil as a current collector and an active film layer attached thereto. The composition of the upper film layer of the current collector is a negative active material, a conductive agent, a dispersing agent and a binder, which are dissolved in a solvent according to a certain proportion, thereby forming slurry for coating the negative electrode. At present, the negative electrode slurry is generally prepared by adding a binder, a solvent, a conductive electrode, active material powder and the like into a container at one time, and then stirring to prepare slurry, or by adding the negative electrode active material, the binder and the like in multiple times, and preparing the slurry by using a high-speed stirring method.
The texture of the aqueous positive and negative electrode paste of the lithium ion battery prepared by the existing preparation method of the aqueous positive and negative electrode paste of the lithium ion battery is not uniform enough, and meanwhile, bubbles easily exist, so that a preparation method of the aqueous positive and negative electrode paste of the lithium ion battery is urgently needed to be designed.
Disclosure of Invention
The invention aims to provide a preparation method of aqueous anode and cathode slurry of a lithium ion battery, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a preparation method of aqueous anode and cathode slurry of a lithium ion battery comprises the following steps:
1) the lithium ion battery aqueous anode slurry comprises 1-2 parts of aqueous binder, 6-8 parts of distilled water, 2-4 parts of anode conductive agent, 1-3 parts of anode active substance, 0.5-0.8 part of dispersant, 70-80 parts of organic solvent and 3-8 parts of thickener, and the preparation method comprises the following steps:
s1: pouring a certain amount of the water-based binder and distilled water into a stirrer, wherein the stirring speed of the stirrer is 1200-1500r/min, and the stirring time is 10-30min to obtain a mixed solution;
s2: adding a certain amount of positive electrode conductive agent and positive electrode active substance into the mixed solution prepared in the step S1, further stirring by using a stirrer, wherein the stirring speed of the stirrer is 500-700r/min, the stirring time is 30-60min, observing the stirring conditions of the positive electrode conductive agent and the positive electrode active substance in the stirrer, and entering the next step after the positive electrode conductive agent and the positive electrode active substance are completely fused in the mixed solution to form a new mixed solution;
s3: adding a certain amount of dispersant and organic solvent into the mixed solution finally prepared in the step S2, and further stirring by using a stirrer, wherein the stirring speed of the stirrer is 1000-1200r/min, and the stirring time is 45-60min, so as to form a new mixed solution;
s4: and adding a certain amount of thickening agent into the mixed solution prepared in the step S3 to adjust the final consistency of the mixed solution, and stirring by using a stirrer, wherein the stirring speed of the stirrer is 800-.
2) The lithium ion battery aqueous negative electrode slurry comprises 2-3 parts of aqueous binder, 7-8 parts of distilled water, 3-5 parts of negative electrode conductive agent, 0.8-1.5 parts of negative electrode active substance, 0.2-0.7 part of dispersant, 75-85 parts of organic solvent and 2-4 parts of thickener, and the preparation method comprises the following steps:
s1: pouring a certain amount of the water-based binder and distilled water into a stirrer, wherein the stirring speed of the stirrer is 1200-1500r/min, and the stirring time is 10-30min to obtain a mixed solution;
s2: adding a certain amount of negative electrode conductive agent and negative electrode active substance into the mixed solution prepared in the step S1, further stirring by using a stirrer, wherein the stirring speed of the stirrer is 500-700r/min, the stirring time is 30-60min, observing the stirring conditions of the positive electrode conductive agent and the positive electrode active substance in the stirrer, and entering the next step after the negative electrode conductive agent and the negative electrode active substance are completely fused in the mixed solution to form a new mixed solution;
s3: adding a certain amount of dispersant and organic solvent into the mixed solution finally prepared in the step S2, and further stirring by using a stirrer, wherein the stirring speed of the stirrer is 1000-1200r/min, and the stirring time is 45-60min, so as to form a new mixed solution;
s4: and adding a certain amount of thickening agent into the mixed solution prepared in the step S3 to adjust the final consistency of the mixed solution, and stirring by using a stirrer, wherein the stirring speed of the stirrer is 800-.
Compared with the prior art, the invention has the beneficial effects that: the lithium ion battery aqueous positive and negative electrode slurry prepared by the method is uniform in texture, and meanwhile, the vibrating motor is utilized to drive the stirring barrel of the stirring machine to vibrate, so that bubbles in the slurry are conveniently discharged, and the quality of the lithium ion battery aqueous positive and negative electrode slurry is ensured.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
In the embodiment of the invention, a preparation method of aqueous anode and cathode slurry of a lithium ion battery comprises the following steps:
1) the lithium ion battery aqueous anode slurry comprises 1-2 parts of aqueous binder, 6-8 parts of distilled water, 2-4 parts of anode conductive agent, 1-3 parts of anode active substance, 0.5-0.8 part of dispersant, 70-80 parts of organic solvent and 3-8 parts of thickener, and the preparation method comprises the following steps:
s1: pouring a certain amount of the water-based binder and distilled water into a stirrer, wherein the stirring speed of the stirrer is 1200-1500r/min, and the stirring time is 10-30min to obtain a mixed solution;
s2: adding a certain amount of positive electrode conductive agent and positive electrode active substance into the mixed solution prepared in the step S1, further stirring by using a stirrer, wherein the stirring speed of the stirrer is 500-700r/min, the stirring time is 30-60min, observing the stirring conditions of the positive electrode conductive agent and the positive electrode active substance in the stirrer, and entering the next step after the positive electrode conductive agent and the positive electrode active substance are completely fused in the mixed solution to form a new mixed solution;
s3: adding a certain amount of dispersant and organic solvent into the mixed solution finally prepared in the step S2, and further stirring by using a stirrer, wherein the stirring speed of the stirrer is 1000-1200r/min, and the stirring time is 45-60min, so as to form a new mixed solution;
s4: and adding a certain amount of thickening agent into the mixed solution prepared in the step S3 to adjust the final consistency of the mixed solution, and stirring by using a stirrer, wherein the stirring speed of the stirrer is 800-.
In the step S1, the water-bath heating is carried out on the stirring barrel of the stirrer in the process of mixing the water-based binder and the distilled water, the temperature in the process of stirring and mixing the water-based binder and the distilled water is kept at 50-60 ℃, and the liquid temperature is immediately detected by a temperature detector;
the positive electrode conductive agent and the positive electrode active material in step S2 need to be pretreated before use, and the pretreatment method and steps are as follows:
the method comprises the following steps: putting a certain amount of positive electrode conductive agent and positive electrode active substance into a ball mill;
step two: opening the ball mill to grind the positive electrode conductive agent and the positive electrode active substance for 30-45 min;
step three: filtering the ground positive electrode conductive agent and the positive electrode active substance for three times by using a 500-plus 800-mesh screen;
step four: and collecting the positive electrode conductive agent and the positive electrode active substance filtered by the mesh screen.
And after the consistency adjustment in the step S4 is completed, the vibration motor is utilized to drive the stirring barrel of the stirring machine to vibrate, so that the air bubbles in the slurry can be conveniently discharged, and the quality of the aqueous anode slurry of the lithium ion battery is ensured.
The water-based binder is polyacrylonitrile,
the positive electrode conductive agent is conductive graphite;
the positive active material is lithium manganate;
the organic solvent is N-methyl pyrrolidone.
The dispersing agent is polyvinylpyrrolidone.
The thickening agent is sodium carboxymethyl cellulose.
2) The lithium ion battery aqueous negative electrode slurry comprises 2-3 parts of aqueous binder, 7-8 parts of distilled water, 3-5 parts of negative electrode conductive agent, 0.8-1.5 parts of negative electrode active substance, 0.2-0.7 part of dispersant, 75-85 parts of organic solvent and 2-4 parts of thickener, and the preparation method comprises the following steps:
s1: pouring a certain amount of the water-based binder and distilled water into a stirrer, wherein the stirring speed of the stirrer is 1200-1500r/min, and the stirring time is 10-30min to obtain a mixed solution;
s2: adding a certain amount of negative electrode conductive agent and negative electrode active substance into the mixed solution prepared in the step S1, further stirring by using a stirrer, wherein the stirring speed of the stirrer is 500-700r/min, the stirring time is 30-60min, observing the stirring condition of the negative electrode conductive agent and the negative electrode active substance in the stirrer, and entering the next step after the negative electrode conductive agent and the negative electrode active substance are completely fused in the mixed solution to form a new mixed solution;
s3: adding a certain amount of dispersant and organic solvent into the mixed solution finally prepared in the step S2, and further stirring by using a stirrer, wherein the stirring speed of the stirrer is 1000-1200r/min, and the stirring time is 45-60min, so as to form a new mixed solution;
s4: and adding a certain amount of thickening agent into the mixed solution prepared in the step S3 to adjust the final consistency of the mixed solution, and stirring by using a stirrer, wherein the stirring speed of the stirrer is 800-.
In the step S1, the water-bath heating is carried out on the stirring barrel of the stirrer in the process of mixing the water-based binder and the distilled water, the temperature in the process of stirring and mixing the water-based binder and the distilled water is kept at 50-60 ℃, and the liquid temperature is immediately detected by a temperature detector;
the anode conductive agent and the anode active material in the step S2 need to be pretreated before use, and the pretreatment method and steps are as follows:
the method comprises the following steps: putting a certain amount of negative electrode conductive agent and negative electrode active substance into a ball mill;
step two: opening a ball mill to grind the negative electrode conductive agent and the negative electrode active substance for 30-45 min;
step three: filtering the ground negative electrode conductive agent and the ground negative electrode active substance for three times by using a 500-800-mesh screen;
step four: and collecting the negative electrode conductive agent and the negative electrode active substance filtered by the mesh screen.
And after the consistency adjustment in the step S4 is completed, the stirring barrel of the stirring machine is driven to vibrate by the vibration motor, so that the air bubbles in the slurry can be conveniently discharged, and the quality of the lithium ion battery aqueous negative electrode slurry is ensured.
The water-based binder is polyacrylonitrile,
the negative electrode conductive agent is conductive graphite;
the negative active material is natural graphite;
the organic solvent is N-methyl pyrrolidone.
The dispersing agent is polyvinylpyrrolidone.
The thickening agent is sodium carboxymethyl cellulose.
Example one
A preparation method of aqueous anode and cathode slurry of a lithium ion battery comprises the following steps:
1) the lithium ion battery aqueous anode slurry comprises 1 part of aqueous binder, 6 parts of distilled water, 2 parts of anode conductive agent, 1 part of anode active substance, 0.5 part of dispersant, 70 parts of organic solvent and 3 parts of thickener, and the preparation method comprises the following steps:
s1: pouring a certain amount of water-based binder and distilled water into a stirrer, wherein the stirring speed of the stirrer is 1200r/min, and the stirring time is 10min, so as to obtain a mixed solution;
s2: adding a certain amount of positive electrode conductive agent and positive electrode active substance into the mixed solution prepared in the step S1, further stirring by using a stirrer, wherein the stirring speed of the stirrer is 500r/min, the stirring time is 30min, observing the stirring condition of the positive electrode conductive agent and the positive electrode active substance in the stirrer, and entering the next step after the positive electrode conductive agent and the positive electrode active substance are completely fused in the mixed solution to form a new mixed solution;
s3: adding a certain amount of dispersant and organic solvent into the mixed solution finally prepared in the step S2, and further stirring by using a stirrer, wherein the stirring speed of the stirrer is 1000r/min, and the stirring time is 45min, so as to form a new mixed solution;
s4: and adding a certain amount of thickening agent into the mixed solution prepared in the step S3 to adjust the final consistency of the mixed solution, and stirring by using a stirrer, wherein the stirring speed of the stirrer is 800r/min, and the stirring time is 50min, so that the aqueous anode slurry of the lithium ion battery is finally prepared.
In the step S1, the water-bath heating is carried out on the stirring barrel of the stirrer in the process of mixing the water-based binder and the distilled water, the temperature in the process of stirring and mixing the water-based binder and the distilled water is kept at 50 ℃, and the liquid temperature is immediately detected by a temperature detector;
the positive electrode conductive agent and the positive electrode active material in step S2 need to be pretreated before use, and the pretreatment method and steps are as follows:
the method comprises the following steps: putting a certain amount of positive electrode conductive agent and positive electrode active substance into a ball mill;
step two: opening the ball mill to grind the positive electrode conductive agent and the positive electrode active substance for 30-45 min;
step three: filtering the ground positive electrode conductive agent and the positive electrode active substance for three times by using a 500-plus 800-mesh screen;
step four: and collecting the positive electrode conductive agent and the positive electrode active substance filtered by the mesh screen.
And after the consistency adjustment in the step S4 is completed, the vibration motor is utilized to drive the stirring barrel of the stirring machine to vibrate, so that the air bubbles in the slurry can be conveniently discharged, and the quality of the aqueous anode slurry of the lithium ion battery is ensured.
The water-based binder is polyacrylonitrile,
the positive electrode conductive agent is conductive graphite;
the positive active material is lithium manganate;
the organic solvent is N-methyl pyrrolidone.
The dispersing agent is polyvinylpyrrolidone.
The thickening agent is sodium carboxymethyl cellulose.
2) The lithium ion battery aqueous negative electrode slurry comprises 2 parts of aqueous binder, 7 parts of distilled water, 3 parts of negative electrode conductive agent, 0.8 part of negative electrode active substance, 0.2 part of dispersant, 75-85 parts of organic solvent and 2 parts of thickener, and the preparation method comprises the following steps:
s1: pouring a certain amount of water-based binder and distilled water into a stirrer, wherein the stirring speed of the stirrer is 1200r/min, and the stirring time is 10min, so as to obtain a mixed solution;
s2: adding a certain amount of negative electrode conductive agent and negative electrode active material into the mixed solution prepared in the step S1, further stirring by using a stirrer, wherein the stirring speed of the stirrer is 500r/min, the stirring time is 30min, observing the stirring condition of the negative electrode conductive agent and the negative electrode active material in the stirrer, and entering the next step after the negative electrode conductive agent and the negative electrode active material are completely fused in the mixed solution to form a new mixed solution;
s3: adding a certain amount of dispersant and organic solvent into the mixed solution finally prepared in the step S2, and further stirring by using a stirrer, wherein the stirring speed of the stirrer is 1000r/min, and the stirring time is 45min, so as to form a new mixed solution;
s4: and adding a certain amount of thickening agent into the mixed solution prepared in the step S3 to adjust the final consistency of the mixed solution, and stirring by using a stirrer, wherein the stirring speed of the stirrer is 800r/min, and the stirring time is 50min, so that the lithium ion battery aqueous negative electrode slurry is finally prepared.
In the step S1, the water-bath heating is carried out on the stirring barrel of the stirrer in the process of mixing the water-based binder and the distilled water, the temperature in the process of stirring and mixing the water-based binder and the distilled water is kept at 50 ℃, and the liquid temperature is immediately detected by a temperature detector;
the anode conductive agent and the anode active material in the step S2 need to be pretreated before use, and the pretreatment method and steps are as follows:
the method comprises the following steps: putting a certain amount of negative electrode conductive agent and negative electrode active substance into a ball mill;
step two: opening a ball mill to grind the negative electrode conductive agent and the negative electrode active substance for 30-45 min;
step three: filtering the ground negative electrode conductive agent and the negative electrode active substance for three times by using a 500-mesh screen;
step four: and collecting the negative electrode conductive agent and the negative electrode active substance filtered by the mesh screen.
And after the consistency adjustment in the step S4 is completed, the stirring barrel of the stirring machine is driven to vibrate by the vibration motor, so that the air bubbles in the slurry can be conveniently discharged, and the quality of the lithium ion battery aqueous negative electrode slurry is ensured.
The water-based binder is polyacrylonitrile,
the negative electrode conductive agent is conductive graphite;
the negative active material is natural graphite;
the organic solvent is N-methyl pyrrolidone.
The dispersing agent is polyvinylpyrrolidone.
The thickening agent is sodium carboxymethyl cellulose.
Example two
A preparation method of aqueous anode and cathode slurry of a lithium ion battery comprises the following steps:
1) the lithium ion battery aqueous anode slurry comprises 2 parts of aqueous binder, 8 parts of distilled water, 4 parts of anode conductive agent, 3 parts of anode active substance, 0.8 part of dispersant, 80 parts of organic solvent and 8 parts of thickener, and the preparation method comprises the following steps:
s1: pouring a certain amount of water-based binder and distilled water into a stirrer, wherein the stirring speed of the stirrer is 1500r/min, and the stirring time is 30min, so as to obtain a mixed solution;
s2: adding a certain amount of positive electrode conductive agent and positive electrode active substance into the mixed solution prepared in the step S1, further stirring by using a stirrer, wherein the stirring speed of the stirrer is 700r/min, the stirring time is 60min, observing the stirring condition of the positive electrode conductive agent and the positive electrode active substance in the stirrer, and entering the next step after the positive electrode conductive agent and the positive electrode active substance are completely fused in the mixed solution to form a new mixed solution;
s3: adding a certain amount of dispersant and organic solvent into the mixed solution finally prepared in the step S2, and further stirring by using a stirrer, wherein the stirring speed of the stirrer is 1200r/min, and the stirring time is 60min, so as to form a new mixed solution;
s4: and adding a certain amount of thickening agent into the mixed solution prepared in the step S3 to adjust the final consistency of the mixed solution, and stirring by using a stirrer, wherein the stirring speed of the stirrer is 1100r/min, and the stirring time is 80min, so that the aqueous anode slurry of the lithium ion battery is finally prepared.
In the step S1, the water-bath heating is carried out on the stirring barrel of the stirrer in the process of mixing the water-based binder and the distilled water, the temperature in the process of stirring and mixing the water-based binder and the distilled water is kept at 60 ℃, and the liquid temperature is immediately detected by a temperature detector;
the positive electrode conductive agent and the positive electrode active material in step S2 need to be pretreated before use, and the pretreatment method and steps are as follows:
the method comprises the following steps: putting a certain amount of positive electrode conductive agent and positive electrode active substance into a ball mill;
step two: opening the ball mill to grind the positive electrode conductive agent and the positive electrode active substance for 30-45 min;
step three: filtering the ground positive electrode conductive agent and the positive electrode active substance for three times by using a 800-mesh screen;
step four: and collecting the positive electrode conductive agent and the positive electrode active substance filtered by the mesh screen.
And after the consistency adjustment in the step S4 is completed, the vibration motor is utilized to drive the stirring barrel of the stirring machine to vibrate, so that the air bubbles in the slurry can be conveniently discharged, and the quality of the aqueous anode slurry of the lithium ion battery is ensured.
The water-based binder is polyacrylonitrile,
the positive electrode conductive agent is conductive graphite;
the positive active material is lithium manganate;
the organic solvent is N-methyl pyrrolidone.
The dispersing agent is polyvinylpyrrolidone.
The thickening agent is sodium carboxymethyl cellulose.
2) The lithium ion battery aqueous negative electrode slurry comprises 3 parts of aqueous binder, 8 parts of distilled water, 5 parts of negative electrode conductive agent, 1.5 parts of negative electrode active substance, 0.7 part of dispersant, 85 parts of organic solvent and 4 parts of thickener, and the preparation method comprises the following steps:
s1: pouring a certain amount of water-based binder and distilled water into a stirrer, wherein the stirring speed of the stirrer is 1500r/min, and the stirring time is 30min, so as to obtain a mixed solution;
s2: adding a certain amount of negative electrode conductive agent and negative electrode active material into the mixed solution prepared in the step S1, further stirring by using a stirrer, wherein the stirring speed of the stirrer is 700r/min, the stirring time is 60min, observing the stirring condition of the negative electrode conductive agent and the negative electrode active material in the stirrer, and entering the next step after the negative electrode conductive agent and the negative electrode active material are completely fused in the mixed solution to form a new mixed solution;
s3: adding a certain amount of dispersant and organic solvent into the mixed solution finally prepared in the step S2, and further stirring by using a stirrer, wherein the stirring speed of the stirrer is 1200r/min, and the stirring time is 60min, so as to form a new mixed solution;
s4: and adding a certain amount of thickening agent into the mixed solution prepared in the step S3 to adjust the final consistency of the mixed solution, and stirring by using a stirrer, wherein the stirring speed of the stirrer is 1100r/min, and the stirring time is 80min, so that the aqueous negative electrode slurry of the lithium ion battery is finally prepared.
In the step S1, the water-bath heating is carried out on the stirring barrel of the stirrer in the process of mixing the water-based binder and the distilled water, the temperature in the process of stirring and mixing the water-based binder and the distilled water is kept at 60 ℃, and the liquid temperature is immediately detected by a temperature detector;
the anode conductive agent and the anode active material in the step S2 need to be pretreated before use, and the pretreatment method and steps are as follows:
the method comprises the following steps: putting a certain amount of negative electrode conductive agent and negative electrode active substance into a ball mill;
step two: opening a ball mill to grind the negative electrode conductive agent and the negative electrode active substance for 30-45 min;
step three: filtering the ground negative electrode conductive agent and the negative electrode active substance for three times by using a 800-mesh screen;
step four: and collecting the negative electrode conductive agent and the negative electrode active substance filtered by the mesh screen.
And after the consistency adjustment in the step S4 is completed, the stirring barrel of the stirring machine is driven to vibrate by the vibration motor, so that the air bubbles in the slurry can be conveniently discharged, and the quality of the lithium ion battery aqueous negative electrode slurry is ensured.
The water-based binder is polyacrylonitrile,
the negative electrode conductive agent is conductive graphite;
the negative active material is natural graphite;
the organic solvent is N-methyl pyrrolidone.
The dispersing agent is polyvinylpyrrolidone.
The thickening agent is sodium carboxymethyl cellulose.
EXAMPLE III
A preparation method of aqueous anode and cathode slurry of a lithium ion battery comprises the following steps:
1) the lithium ion battery aqueous anode slurry comprises 1.5 parts of aqueous binder, 7 parts of distilled water, 3 parts of anode conductive agent, 2 parts of anode active substance, 0.7 part of dispersant, 75 parts of organic solvent and 5 parts of thickener, and the preparation method comprises the following steps:
s1: pouring a certain amount of water-based binder and distilled water into a stirrer, wherein the stirring speed of the stirrer is 1300r/min, and the stirring time is 15min, so as to obtain a mixed solution;
s2: adding a certain amount of positive electrode conductive agent and positive electrode active substance into the mixed solution prepared in the step S1, further stirring by using a stirrer, wherein the stirring speed of the stirrer is 600r/min, the stirring time is 50min, observing the stirring condition of the positive electrode conductive agent and the positive electrode active substance in the stirrer, and entering the next step after the positive electrode conductive agent and the positive electrode active substance are completely fused in the mixed solution to form a new mixed solution;
s3: adding a certain amount of dispersant and organic solvent into the mixed solution finally prepared in the step S2, and further stirring by using a stirrer, wherein the stirring speed of the stirrer is 1100r/min, and the stirring time is 50min, so as to form a new mixed solution;
s4: and adding a certain amount of thickening agent into the mixed solution prepared in the step S3 to adjust the final consistency of the mixed solution, and stirring by using a stirrer, wherein the stirring speed of the stirrer is 1000r/min, and the stirring time is 60min, so that the lithium ion battery aqueous anode slurry is finally prepared.
In the step S1, the water-bath heating is carried out on the stirring barrel of the stirrer in the process of mixing the water-based binder and the distilled water, the temperature in the process of stirring and mixing the water-based binder and the distilled water is kept at 55 ℃, and the liquid temperature is immediately detected by a temperature detector;
the positive electrode conductive agent and the positive electrode active material in step S2 need to be pretreated before use, and the pretreatment method and steps are as follows:
the method comprises the following steps: putting a certain amount of positive electrode conductive agent and positive electrode active substance into a ball mill;
step two: opening the ball mill to grind the positive electrode conductive agent and the positive electrode active substance for 30-45 min;
step three: filtering the ground positive electrode conductive agent and the positive electrode active substance for three times by using a 700-mesh screen;
step four: and collecting the positive electrode conductive agent and the positive electrode active substance filtered by the mesh screen.
And after the consistency adjustment in the step S4 is completed, the vibration motor is utilized to drive the stirring barrel of the stirring machine to vibrate, so that the air bubbles in the slurry can be conveniently discharged, and the quality of the aqueous anode slurry of the lithium ion battery is ensured.
The water-based binder is polyacrylonitrile,
the positive electrode conductive agent is conductive graphite;
the positive active material is lithium manganate;
the organic solvent is N-methyl pyrrolidone.
The dispersing agent is polyvinylpyrrolidone.
The thickening agent is sodium carboxymethyl cellulose.
2) The lithium ion battery aqueous negative electrode slurry comprises 1.5 parts of aqueous binder, 7.5 parts of distilled water, 4 parts of negative electrode conductive agent, 1.2 parts of negative electrode active substance, 0.5 part of dispersant, 80 parts of organic solvent and 3 parts of thickener, and the preparation method comprises the following steps:
s1: pouring a certain amount of water-based binder and distilled water into a stirrer, wherein the stirring speed of the stirrer is 1400r/min, and the stirring time is 20min, so as to obtain a mixed solution;
s2: adding a certain amount of negative electrode conductive agent and negative electrode active material into the mixed solution prepared in the step S1, further stirring by using a stirrer, wherein the stirring speed of the stirrer is 600r/min, the stirring time is 50min, observing the stirring condition of the negative electrode conductive agent and the negative electrode active material in the stirrer, and entering the next step after the negative electrode conductive agent and the negative electrode active material are completely fused in the mixed solution to form a new mixed solution;
s3: adding a certain amount of dispersant and organic solvent into the mixed solution finally prepared in the step S2, and further stirring by using a stirrer, wherein the stirring speed of the stirrer is 110r/min, and the stirring time is 50min, so as to form a new mixed solution;
s4: and adding a certain amount of thickening agent into the mixed solution prepared in the step S3 to adjust the final consistency of the mixed solution, and stirring by using a stirrer, wherein the stirring speed of the stirrer is 1000r/min, and the stirring time is 70min, so that the lithium ion battery aqueous negative electrode slurry is finally prepared.
In the step S1, the water-bath heating is carried out on the stirring barrel of the stirrer in the process of mixing the water-based binder and the distilled water, the temperature in the process of stirring and mixing the water-based binder and the distilled water is kept at 55 ℃, and the liquid temperature is immediately detected by a temperature detector;
the anode conductive agent and the anode active material in the step S2 need to be pretreated before use, and the pretreatment method and steps are as follows:
the method comprises the following steps: putting a certain amount of negative electrode conductive agent and negative electrode active substance into a ball mill;
step two: opening a ball mill to grind the negative electrode conductive agent and the negative electrode active substance for 30-45 min;
step three: filtering the ground negative electrode conductive agent and the negative electrode active substance for three times by using a 700-mesh screen;
step four: and collecting the negative electrode conductive agent and the negative electrode active substance filtered by the mesh screen.
And after the consistency adjustment in the step S4 is completed, the stirring barrel of the stirring machine is driven to vibrate by the vibration motor, so that the air bubbles in the slurry can be conveniently discharged, and the quality of the lithium ion battery aqueous negative electrode slurry is ensured.
The water-based binder is polyacrylonitrile,
the negative electrode conductive agent is conductive graphite;
the negative active material is natural graphite;
the organic solvent is N-methyl pyrrolidone.
The dispersing agent is polyvinylpyrrolidone.
The thickening agent is sodium carboxymethyl cellulose.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (7)
1. A preparation method of aqueous anode and cathode slurry of a lithium ion battery is characterized by comprising the following steps: the preparation method comprises the following steps:
1) the lithium ion battery aqueous anode slurry comprises 1-2 parts of aqueous binder, 6-8 parts of distilled water, 2-4 parts of anode conductive agent, 1-3 parts of anode active substance, 0.5-0.8 part of dispersant, 70-80 parts of organic solvent and 3-8 parts of thickener, and the preparation method comprises the following steps:
s1: pouring a certain amount of the water-based binder and distilled water into a stirrer, wherein the stirring speed of the stirrer is 1200-1500r/min, and the stirring time is 10-30min to obtain a mixed solution;
s2: adding a certain amount of positive electrode conductive agent and positive electrode active substance into the mixed solution prepared in the step S1, further stirring by using a stirrer, wherein the stirring speed of the stirrer is 500-700r/min, the stirring time is 30-60min, observing the stirring conditions of the positive electrode conductive agent and the positive electrode active substance in the stirrer, and entering the next step after the positive electrode conductive agent and the positive electrode active substance are completely fused in the mixed solution to form a new mixed solution;
s3: adding a certain amount of dispersant and organic solvent into the mixed solution finally prepared in the step S2, and further stirring by using a stirrer, wherein the stirring speed of the stirrer is 1000-1200r/min, and the stirring time is 45-60min, so as to form a new mixed solution;
s4: and adding a certain amount of thickening agent into the mixed solution prepared in the step S3 to adjust the final consistency of the mixed solution, and stirring by using a stirrer, wherein the stirring speed of the stirrer is 800-.
2) The lithium ion battery aqueous negative electrode slurry comprises 2-3 parts of aqueous binder, 7-8 parts of distilled water, 3-5 parts of negative electrode conductive agent, 0.8-1.5 parts of negative electrode active substance, 0.2-0.7 part of dispersant, 75-85 parts of organic solvent and 2-4 parts of thickener, and the preparation method comprises the following steps:
s1: pouring a certain amount of the water-based binder and distilled water into a stirrer, wherein the stirring speed of the stirrer is 1200-1500r/min, and the stirring time is 10-30min to obtain a mixed solution;
s2: adding a certain amount of negative electrode conductive agent and negative electrode active substance into the mixed solution prepared in the step S1, further stirring by using a stirrer, wherein the stirring speed of the stirrer is 500-700r/min, the stirring time is 30-60min, observing the stirring conditions of the positive electrode conductive agent and the positive electrode active substance in the stirrer, and entering the next step after the negative electrode conductive agent and the negative electrode active substance are completely fused in the mixed solution to form a new mixed solution;
s3: adding a certain amount of dispersant and organic solvent into the mixed solution finally prepared in the step S2, and further stirring by using a stirrer, wherein the stirring speed of the stirrer is 1000-1200r/min, and the stirring time is 45-60min, so as to form a new mixed solution;
s4: and adding a certain amount of thickening agent into the mixed solution prepared in the step S3 to adjust the final consistency of the mixed solution, and stirring by using a stirrer, wherein the stirring speed of the stirrer is 800-.
2. The preparation method of the aqueous positive and negative electrode paste for the lithium ion battery according to claim 1, wherein the preparation method comprises the following steps: and S1, heating the stirring barrel of the stirrer in a water bath manner in the process of mixing the aqueous binder and the distilled water, ensuring that the temperature of the aqueous binder and the distilled water is kept between 50 and 60 ℃ in the stirring and mixing process, and immediately detecting the liquid temperature through a temperature detector.
3. The preparation method of the aqueous positive and negative electrode paste for the lithium ion battery according to claim 1, wherein the preparation method comprises the following steps: the positive electrode conductive agent and the positive electrode active material in step S2 need to be pretreated before use, and the pretreatment method and steps are as follows:
the method comprises the following steps: putting a certain amount of positive electrode conductive agent and positive electrode active substance into a ball mill;
step two: opening the ball mill to grind the positive electrode conductive agent and the positive electrode active substance for 30-45 min;
step three: filtering the ground positive electrode conductive agent and the positive electrode active substance for three times by using a 500-plus 800-mesh screen;
step four: and collecting the positive electrode conductive agent and the positive electrode active substance filtered by the mesh screen.
4. The preparation method of the aqueous positive and negative electrode paste for the lithium ion battery according to claim 1, wherein the preparation method comprises the following steps: and after the consistency adjustment in the step S4 is completed, the vibration motor is utilized to drive the stirring barrel of the stirring machine to vibrate, so that the air bubbles in the slurry can be conveniently discharged, and the quality of the aqueous anode slurry of the lithium ion battery is ensured.
5. The preparation method of the aqueous positive and negative electrode paste for the lithium ion battery according to claim 1, wherein the preparation method comprises the following steps: and S1, heating the stirring barrel of the stirrer in a water bath manner in the process of mixing the aqueous binder and the distilled water, ensuring that the temperature of the aqueous binder and the distilled water is kept between 50 and 60 ℃ in the stirring and mixing process, and immediately detecting the liquid temperature through a temperature detector.
6. The preparation method of the aqueous positive and negative electrode paste for the lithium ion battery according to claim 1, wherein the preparation method comprises the following steps: the anode conductive agent and the anode active material in the step S2 need to be pretreated before use, and the pretreatment method and steps are as follows:
the method comprises the following steps: putting a certain amount of negative electrode conductive agent and negative electrode active substance into a ball mill;
step two: opening a ball mill to grind the negative electrode conductive agent and the negative electrode active substance for 30-45 min;
step three: filtering the ground negative electrode conductive agent and the ground negative electrode active substance for three times by using a 500-800-mesh screen;
step four: and collecting the negative electrode conductive agent and the negative electrode active substance filtered by the mesh screen.
7. The preparation method of the aqueous positive and negative electrode paste for the lithium ion battery according to claim 1, wherein the preparation method comprises the following steps: and after the consistency adjustment in the step S4 is completed, the stirring barrel of the stirring machine is driven to vibrate by the vibration motor, so that the air bubbles in the slurry can be conveniently discharged, and the quality of the lithium ion battery aqueous negative electrode slurry is ensured.
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