CN112467143A - Preparation method of lithium ion battery cathode slurry - Google Patents
Preparation method of lithium ion battery cathode slurry Download PDFInfo
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- CN112467143A CN112467143A CN202011381412.6A CN202011381412A CN112467143A CN 112467143 A CN112467143 A CN 112467143A CN 202011381412 A CN202011381412 A CN 202011381412A CN 112467143 A CN112467143 A CN 112467143A
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- stirring
- slurry
- lithium ion
- ion battery
- dry powder
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a preparation method of lithium ion battery cathode slurry, wherein after glue solution is prepared, 4 parts by weight of conductive agent SP are added into one part of glue solution, and the mixture is stirred at a low speed until dry powder is wetted and then stirred at a high speed until the dry powder is uniform; meanwhile, adding 32 parts by weight of graphite into the other part of glue solution, stirring at a low speed until the dry powder is wetted, and stirring at a high speed until the dry powder is uniform; mixing 2 parts, and stirring at a high speed until the mixture is uniform; after the slurry is uniformly stirred, carrying out viscosity test, if the viscosity is qualified, adding 2 parts by weight of SBR binder, and then carrying out low-speed stirring; and (6) discharging.
Description
Technical Field
The invention relates to a preparation method of lithium ion battery slurry.
Background
With the development of the lithium ion battery industry, the use of the water-soluble binder is more and more extensive, and particularly, the water-soluble binder is more used in the preparation of the cathode slurry. Not only is the requirement on the environment during the use process low, but also batteries manufactured by using the water-soluble slurry have no obvious difference in performance according to some reports. Meanwhile, compared with the binder for the PVDF positive electrode, the water-soluble binder is not easy to react to release HF, so that the capacity loss of the battery or the safety problem occurs, and the safety is higher.
For example, the Chinese patent authorization publication number: CN102916166A, a patent document entitled as 2013, 02, 06, discloses a preparation method of a lithium ion battery slurry, which comprises the following steps: (1) glue solution preparation: adding deionized water and CMC in proportion into a stirring tank, opening revolution for low-speed stirring, and taking out the glue solution for later use after exhausting; (2) slurry preparation: adding graphite and a conductive agent into a slurry tank in proportion to perform low-speed revolution stirring, opening autorotation stirring when dry powder is completely wetted, and adding SBR binder with the same amount as CMC if the viscosity is qualified; (3) discharging: before discharging, the obtained slurry is vacuumized and sieved. The slurry obtained by the invention has stable components and high quality. However, the slurry of the CMC and SBR system also has the following disadvantages: the viscosity of the alloy can be reduced along with the rise of the temperature, and the alloy is easy to absorb moisture and even has the problem of negative pole powder falling.
Disclosure of Invention
The invention provides a preparation method of lithium ion battery cathode slurry, aiming at the problems of multiple preparation steps and long period of the existing lithium ion battery cathode slurry.
The purpose of the invention is realized by the following scheme: a preparation method of lithium ion battery negative electrode slurry comprises the following steps:
(1) preparing glue solution: respectively adding 80-85 parts by weight of deionized water and 1 part by weight of CMC into a stirring tank, stirring at a low speed, and uniformly stirring to obtain two parts of glue solution;
(2) adding 4 parts by weight of conductive agent SP into one part of glue solution, stirring at a low speed until the dry powder is wetted, and stirring at a high speed until the dry powder is uniform;
(3) meanwhile, adding 32 parts by weight of graphite into the other part of glue solution, stirring at a low speed until the dry powder is wetted, and stirring at a high speed until the dry powder is uniform;
(4) mixing the components (2) and (3), and stirring at a high speed until the mixture is uniform;
(5) after the slurry is uniformly stirred, carrying out viscosity test, if the viscosity is qualified, adding 2 parts by weight of SBR binder, and then carrying out low-speed stirring;
(6) discharging: and before discharging, vacuumizing the obtained slurry, vacuumizing while stopping vacuumizing when the vacuum degree is reached, keeping the vacuum state, continuously stirring until air in the slurry is sufficiently discharged, and sieving to discharge.
Respectively stirring conductive agent SP and graphite with CMC glue solution at high speed, mixing, adding SBR after viscosity is qualified, vacuumizing, filtering and discharging.
The number of the sand meshes used in discharging is less than 150 meshes.
The invention has the advantages that: according to the invention, the conductive agent SP and the graphite are respectively and uniformly mixed with the CMC glue solution at a high speed, so that the conductive agent SP and the graphite are fully dispersed, and the quality of the slurry can be effectively improved. According to the invention, the conductive agent SP and graphite are respectively and uniformly mixed with the CMC glue solution at a high speed, and after the viscosity is qualified, SBR is added, vacuum pumping and filtering discharging are carried out, so that the preparation time can be greatly shortened, and the preparation efficiency of the slurry is improved.
Detailed Description
Example 1:
the lithium ion battery cathode slurry is prepared by the following steps:
(1) preparing glue solution: cleaning up a tank A and a tank B of two mixing equipment, simultaneously respectively adding 335g of deionized water and 4g of CMC dry powder into the material tanks, stirring at a low speed by using a rotating speed of 200r/min, scraping after 15min, then stirring at a high speed by using a rotating speed of 1000r/min, stopping stirring when no caking exists in a glue solution and the glue solution is completely transparent, and taking 45 min;
(2) adding 16g of conductive agent SP into the tank A, stirring at a low speed of 200r/min until dry powder is wetted, scraping after 20min, and stirring at a high speed of 1000r/min for 100min until the dry powder is uniform;
(3) meanwhile, 128g of graphite is added into the tank B, and the mixture is stirred at a low speed until dry powder is wetted and then stirred at a high speed until the dry powder is uniform;
(4) mixing the components (2) and (3), and stirring at a high speed until the mixture is uniform; pouring the slurry in the tank B into the tank A (or pouring the slurry in the tank A into the tank B), and stirring at a high speed of 1000r/min until the slurry is uniform;
(5) after the slurry is uniformly stirred, performing viscosity test, wherein the viscosity is 5000-6000 mpa.s, taking 30min, adding 8g of SBR binder, and stirring for 30min at a low speed of 200 r/min;
(6) discharging: before discharging, the obtained slurry is vacuumized, and is stirred at low speed, the vacuum state is maintained (the vacuum state is maintained after the vacuum degree reaches-0.08 MPa), when the vacuum degree is reached, the vacuum pumping is stopped, the vacuum state is maintained, the stirring is continued for 30min, the slurry state is observed, no bubbles exist on the surface, the viscosity is good, the slurry is filtered by a 100-mesh sand screen, and the slurry obtained by sieving and discharging is good in state and suitable for coating.
The whole process takes 240min, namely 4 hours.
Comparative example 1:
cleaning mixing equipment, adding 670g of deionized water and 8g of CMC dry powder into a charging bucket, stirring at a low speed by using a rotating speed of 200r/min, scraping after 15 minutes, then stirring at a high speed by using a rotating speed of 1000r/min, stopping stirring when no caking exists in glue liquid and the glue liquid is completely transparent, and taking 105 minutes.
Adding 16g of conductive agent SP into the charging bucket, stirring at a low speed of 200r/min, scraping after 20min, and stirring at a high speed of 1000r/min until the slurry is smooth and has no dry powder agglomeration, wherein the time for use is 100min.
Adding 128g of graphite into a charging bucket, stirring at a low speed by using a rotating speed of 200r/min, scraping after 20min, and then stirring at a high speed by using a rotating speed of 1000r/min until the slurry is smooth, no dry powder is agglomerated, and the viscosity is 5000-6000 mpa.s, wherein the time for use is 100min.
Vacuumizing treatment is carried out before discharging, and vacuumizing is carried out while stirring at low speed (the vacuum state is maintained after the vacuum degree reaches-0.08 MPa), and the slurry state is observed after 30min, so that the surface has no bubbles and the viscosity is good. And (4) discharging, filtering the slurry by using a 100-mesh sand screen, wherein the obtained slurry is good in state and suitable for coating.
The whole process takes 390min, namely 6.5 hours.
The comparison shows that the method can obviously shorten the preparation time of the slurry and improve the preparation efficiency of the slurry. While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (5)
1. The preparation method of the lithium ion battery cathode slurry is characterized by comprising the following steps:
(1) preparing glue solution: respectively adding 80-85 parts by weight of deionized water and 1 part by weight of CMC into a stirring tank, stirring at a low speed, and uniformly stirring to obtain two parts of glue solution;
(2) adding 4 parts by weight of conductive agent SP into one part of glue solution, stirring at a low speed until the dry powder is wetted, and stirring at a high speed until the dry powder is uniform;
(3) meanwhile, adding 32 parts by weight of graphite into the other part of glue solution, stirring at a low speed until the dry powder is wetted, and stirring at a high speed until the dry powder is uniform;
(4) mixing the components (2) and (3), and stirring at a high speed until the mixture is uniform;
(5) after the slurry is uniformly stirred, carrying out viscosity test, if the viscosity is qualified, adding 2 parts by weight of SBR binder, and then carrying out low-speed stirring;
(6) discharging: and before discharging, vacuumizing the obtained slurry, vacuumizing while stopping vacuumizing when the vacuum degree is reached, keeping the vacuum state, continuously stirring until air in the slurry is sufficiently discharged, and sieving to discharge.
2. The method for preparing the lithium ion battery slurry according to claim 1, wherein: respectively stirring conductive agent SP and graphite with CMC glue solution at high speed, mixing, adding SBR after viscosity is qualified, vacuumizing, filtering and discharging.
3. The method for preparing the lithium ion battery slurry according to claim 1, wherein: the number of the sand meshes used in discharging is less than 150 meshes.
4. The method for preparing the lithium ion battery slurry according to claim 1, wherein: in the step (5), the viscosity is 5000-6000 mpa.s.
5. The method for preparing the lithium ion battery slurry according to claim 1, wherein: in the step (6), after the vacuum degree reaches-0.08 MPa, the vacuum state is kept and stirring is continued for 30 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011381412.6A CN112467143A (en) | 2020-12-01 | 2020-12-01 | Preparation method of lithium ion battery cathode slurry |
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| CN202011381412.6A CN112467143A (en) | 2020-12-01 | 2020-12-01 | Preparation method of lithium ion battery cathode slurry |
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| CN112467143A true CN112467143A (en) | 2021-03-09 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102916166A (en) * | 2012-10-16 | 2013-02-06 | 彩虹集团公司 | Lithium ion battery paste preparation method |
| CN103022433A (en) * | 2012-11-23 | 2013-04-03 | 彩虹集团公司 | Method for preparing lithium battery slurry |
| CN104466111A (en) * | 2014-12-09 | 2015-03-25 | 河北银隆新能源有限公司 | Preparation process of lithium battery slurry |
| US20180301687A1 (en) * | 2017-04-13 | 2018-10-18 | Hon Hai Precision Industry Co., Ltd. | Method for preparing cathode slurry of lithium ion battery |
| CN109290155A (en) * | 2018-08-03 | 2019-02-01 | 深圳市山木新能源科技股份有限公司 | A kind of coating method of graphene lithium battery pole slice |
| CN111029532A (en) * | 2020-01-02 | 2020-04-17 | 朱虎 | Preparation method of lithium ion battery anode |
-
2020
- 2020-12-01 CN CN202011381412.6A patent/CN112467143A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102916166A (en) * | 2012-10-16 | 2013-02-06 | 彩虹集团公司 | Lithium ion battery paste preparation method |
| CN103022433A (en) * | 2012-11-23 | 2013-04-03 | 彩虹集团公司 | Method for preparing lithium battery slurry |
| CN104466111A (en) * | 2014-12-09 | 2015-03-25 | 河北银隆新能源有限公司 | Preparation process of lithium battery slurry |
| US20180301687A1 (en) * | 2017-04-13 | 2018-10-18 | Hon Hai Precision Industry Co., Ltd. | Method for preparing cathode slurry of lithium ion battery |
| CN109290155A (en) * | 2018-08-03 | 2019-02-01 | 深圳市山木新能源科技股份有限公司 | A kind of coating method of graphene lithium battery pole slice |
| CN111029532A (en) * | 2020-01-02 | 2020-04-17 | 朱虎 | Preparation method of lithium ion battery anode |
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Application publication date: 20210309 |