CN112467065A - Rapid and efficient preparation method of lithium ion battery slurry, pole piece and battery thereof - Google Patents
Rapid and efficient preparation method of lithium ion battery slurry, pole piece and battery thereof Download PDFInfo
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- CN112467065A CN112467065A CN202011308532.3A CN202011308532A CN112467065A CN 112467065 A CN112467065 A CN 112467065A CN 202011308532 A CN202011308532 A CN 202011308532A CN 112467065 A CN112467065 A CN 112467065A
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- Prior art keywords
- slurry
- lithium ion
- ion battery
- pole piece
- preparing
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- 239000002002 slurry Substances 0.000 title claims abstract description 69
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000013543 active substance Substances 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000007580 dry-mixing Methods 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 11
- 239000002904 solvent Substances 0.000 claims abstract description 10
- 239000011230 binding agent Substances 0.000 claims abstract description 8
- 239000006258 conductive agent Substances 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 8
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000002033 PVDF binder Substances 0.000 claims description 6
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 6
- 229910002804 graphite Inorganic materials 0.000 claims description 5
- 239000010439 graphite Substances 0.000 claims description 5
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 4
- 239000006230 acetylene black Substances 0.000 claims description 4
- 229910052744 lithium Inorganic materials 0.000 claims description 4
- 229920000058 polyacrylate Polymers 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- DVATZODUVBMYHN-UHFFFAOYSA-K lithium;iron(2+);manganese(2+);phosphate Chemical compound [Li+].[Mn+2].[Fe+2].[O-]P([O-])([O-])=O DVATZODUVBMYHN-UHFFFAOYSA-K 0.000 claims description 3
- 239000002041 carbon nanotube Substances 0.000 claims description 2
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 2
- 229910021389 graphene Inorganic materials 0.000 claims description 2
- 239000002245 particle Substances 0.000 abstract description 8
- 239000004576 sand Substances 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000005054 agglomeration Methods 0.000 abstract description 2
- 230000002776 aggregation Effects 0.000 abstract description 2
- 239000011149 active material Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000004537 pulping Methods 0.000 description 3
- 238000001878 scanning electron micrograph Methods 0.000 description 3
- 238000000576 coating method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- CPSYWNLKRDURMG-UHFFFAOYSA-L hydron;manganese(2+);phosphate Chemical compound [Mn+2].OP([O-])([O-])=O CPSYWNLKRDURMG-UHFFFAOYSA-L 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
-
- 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
-
- 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 fast and efficient preparation method of lithium ion battery slurry, a pole piece and a battery thereof, and the first step is as follows: dry-mixing the active substance, the conductive agent and the binder required by preparing the slurry; the second step is that: putting the dry-mixed materials into a solvent for mixing again to form initial slurry; the third step: and (4) sanding the initial slurry through a sand mill. The invention has the advantages that: the active substance adopted by the invention does not need to be crushed in advance, so that the preparation procedures of the active substance are reduced, and the production cost is reduced. Secondly, the method comprises the following steps: the invention can realize the rapid preparation of the lithium ion battery slurry, improve the production efficiency, simultaneously obtain more uniform slurry, avoid the agglomeration of large particles and improve the consistency of the lithium ion battery.
Description
Technical Field
The invention relates to the field of lithium ion batteries, in particular to a quick and efficient preparation method of lithium ion battery slurry, a pole piece and a battery thereof.
Background
Lithium ion batteries are widely used in automobiles, electronic products and electric tools at present due to the advantages of high energy density, small self-discharge, excellent cycle performance, no memory effect and the like, and in recent years, the lithium ion batteries gradually relate to the fields of 5G base stations, energy storage, ships and the like.
The preparation process of the lithium ion battery can be roughly divided into the working procedures of pulping, coating, roll-to-roll, slitting, winding, assembling and the like, each working procedure needs to be strictly controlled, the pulping working procedure is firstly carried out, active substances, conductive agents, binding agents, solvents and the like are mixed into slurry, and the formed slurry is required to have good dispersibility, no agglomeration and large particle phenomenon and to be uniform and stable. Which would otherwise directly affect the uniformity of the fabricated battery and the electrical performance of the battery.
The preparation method of the existing lithium ion battery slurry can be divided into two types, wherein the first type is dry mixing, active substances, a conductive agent and a binding agent are premixed, and then a solvent is added for mixing; the second type is wet mixing, which is to add the binder into the solvent to dissolve and form a gel, and then add the active substance and the conductive agent into the gel to mix. The active substances used in the two methods can be used after crushing treatment (airflow crushing or mechanical crushing), the crushing effect is not easy to control, and the batch stability of the product is poor. Simultaneously, in order to achieve the dispersing effect, the slurry needs to be stirred and dispersed for a long time during pulping, the time is very long, even if the slurry is used, the slurry inevitably has agglomerated large particles, and the pole piece is protruded in the coating process to influence the performance of the battery.
Disclosure of Invention
The invention mainly aims to solve the problems and the defects in the technical aspect and provides a quick and efficient preparation method of lithium ion battery slurry, a pole piece and a battery thereof.
The purpose of the invention is realized by the following technical scheme:
a preparation method of fast and efficient lithium ion battery slurry specifically comprises the following steps:
1) dry-mixing the active substance, the conductive agent and the binder required by the preparation of the slurry to obtain a mixed material A;
2) adding the mixed material A into a solvent, controlling the amount of the added solvent to be 45-65% of the solid content of the slurry, and stirring and mixing to obtain initial slurry B;
3) sanding the initial slurry B through a sanding machine to obtain final battery slurry;
preferably, the active substance in the step 1) is one or more of lithium iron phosphate, lithium manganese iron phosphate and lithium titanate which are not subjected to crushing treatment.
Preferably, the conductive agent in the step 1) is one or more of graphite, acetylene black, carbon nanotubes and graphene.
Preferably, the binder in the step 1) is one or more of polyvinylidene fluoride and polyacrylate.
Preferably, the dry mixing time in the step 1) is 30-120 min;
preferably, the solvent in the step 2) is one or more of N-methyl pyrrolidone, acetone and ethanol.
Preferably, the stirring time in the step 2) is 60-180 min;
preferably, the slurry is sanded for 1 to 3 times in step 3);
a battery pole piece made of the battery slurry is prepared from the battery slurry formed in the steps (1), (2) and (3).
A lithium ion battery made of the battery pole piece is provided.
Compared with the prior art, the invention has the following characteristics:
first, the active material required for preparing the slurry can be prepared without performing a crushing process by the present invention, which reduces a crushing process in producing the active material and reduces the production cost of the active material.
Secondly, the battery slurry is subjected to sanding treatment by a sand mill, so that the stirring and dispersing time of the slurry can be effectively reduced, and the production efficiency is improved; meanwhile, the slurry can be prevented from agglomerating large particles after being subjected to sanding treatment, so that the slurry can be better kept.
Drawings
FIG. 1 is a scanning electron micrograph of a pole piece prepared from the slurry of comparative example 1.
FIG. 2 is a scanning electron micrograph of a pole piece prepared from the slurry of comparative example 2.
FIG. 3 is a scanning electron micrograph of a pole piece prepared from the slurry of example 2.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
Comparative example 1
Carrying out dry mixing on active substances, namely lithium manganese iron phosphate, carbon black and polyvinylidene fluoride which are not crushed in a stirrer for 120 min; then adding the mixture into N-methyl pyrrolidone, controlling the solid content to be 50%, and stirring and mixing for 240min to obtain lithium ion battery slurry;
comparative example 2
Carrying out dry mixing on the crushed active materials of lithium iron phosphate, graphite and polyvinylidene fluoride in a stirrer for 120 min; then adding the mixture into N-methyl pyrrolidone, controlling the solid content to be 50%, and stirring and mixing for 240min to obtain lithium ion battery slurry;
example 1
Carrying out dry mixing on uncrushed active substances, namely lithium iron phosphate, graphite and polyvinylidene fluoride in a stirrer for 30 min; then adding the mixture into N-methyl pyrrolidone, controlling the solid content to be 50%, and stirring and mixing for 120min to obtain primary slurry; and finally, sanding the primary slurry for 2 times by using a sand mill to obtain the lithium ion battery slurry.
Example 2
Carrying out dry mixing on uncrushed active substances, namely lithium iron phosphate, graphite and polyvinylidene fluoride in a stirrer for 120 min; then adding the mixture into N-methyl pyrrolidone, controlling the solid content to be 45%, and stirring and mixing for 60min to obtain primary slurry; and finally, sanding the primary slurry for 1 time by using a sand mill to obtain the lithium ion battery slurry.
Example 3
Carrying out dry mixing on unbroken active substances of lithium titanate, acetylene black and polyacrylate in a stirrer for 60 min; then adding the mixture into acetone, controlling the solid content to be 65%, and stirring and mixing for 180min to obtain primary slurry; and finally, sanding the primary slurry for 3 times by using a sand mill to obtain the lithium ion battery slurry.
Example 4
Carrying out dry mixing on unbroken active substances of lithium ferric manganese phosphate, acetylene black and polyacrylate in a stirrer for 90 min; then adding the mixture into ethanol, controlling the solid content to be 52%, and stirring and mixing for 90min to obtain primary slurry; and finally, sanding the primary slurry for 1 time by using a sand mill to obtain the lithium ion battery slurry.
The slurry obtained in the comparative examples 1 and 2 and the slurry obtained in the example 2 are prepared into pole pieces, and then the pole pieces are subjected to a scanning electron microscope test.
Comparing fig. 1 and 2 with fig. 3, it is found that agglomerated large particles exist in the slurry if the active material is not crushed before the slurry is prepared, the surface of the pole piece coated with the agglomerated large particles is uneven and extremely uneven, and the surface of the pole piece coated with the agglomerated large particles is even and even if the active material is not crushed before the slurry is prepared by the invention, the particles are even. Therefore, the active substance can be broken in advance without the adoption of the invention, so that the breaking procedures in the preparation process of the active substance are reduced, and the production cost is reduced. Meanwhile, the pole piece prepared by the slurry is more uniform, and the surface is smoother.
Those skilled in the art to which the present invention pertains can also make appropriate alterations and modifications to the above-described embodiments, in light of the above disclosure. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and modifications and variations of the present invention are also intended to fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. A preparation method of fast and efficient lithium ion battery slurry specifically comprises the following steps:
dry-mixing the active substance, the conductive agent and the binder required by the preparation of the slurry to obtain a mixed material A;
adding the mixed material A into a solvent, controlling the amount of the added solvent to be 45-65% of the solid content of the slurry, and stirring and mixing to obtain initial slurry B;
and sanding the initial slurry B through a sanding machine to obtain the final battery slurry.
2. The method for preparing the lithium ion battery slurry with high efficiency according to claim 1, is characterized in that:
in the step 1), the active substance is one or more of lithium iron phosphate, lithium manganese iron phosphate and lithium titanate which are not subjected to crushing treatment.
3. The method for preparing the lithium ion battery slurry with high efficiency according to claim 1, is characterized in that: the conductive agent in the step 1) is one or more of graphite, acetylene black, carbon nano tubes and graphene.
4. The method for preparing the lithium ion battery slurry with high efficiency according to claim 1, is characterized in that: the binder in the step 1) is one or more of polyvinylidene fluoride and polyacrylate.
5. The method for preparing the lithium ion battery slurry with high efficiency according to claim 1, is characterized in that: the dry mixing time in the step 1) is 30-120 min.
6. The method for preparing the lithium ion battery slurry with high efficiency according to claim 1, is characterized in that: in the step 2), the solvent is one or more of N-methyl pyrrolidone, acetone and ethanol.
7. The method for preparing the lithium ion battery slurry with high efficiency according to claim 1, is characterized in that: the stirring time in the step 2) is 60-180 min.
8. The method for preparing the lithium ion battery slurry with high efficiency according to claim 1, is characterized in that: and 3) sanding the slurry for 1-3 times.
9. A battery pole piece prepared by the method for preparing the lithium ion battery slurry with high speed and high efficiency as claimed in any one of claims 1 to 8, which is characterized in that the slurry of the battery pole piece is prepared by the steps in the claims.
10. A lithium ion battery fabricated from the battery pole piece of claim 9, wherein the lithium ion battery pole piece is fabricated from the battery pole piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011308532.3A CN112467065A (en) | 2020-11-20 | 2020-11-20 | Rapid and efficient preparation method of lithium ion battery slurry, pole piece and battery thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011308532.3A CN112467065A (en) | 2020-11-20 | 2020-11-20 | Rapid and efficient preparation method of lithium ion battery slurry, pole piece and battery thereof |
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| Publication Number | Publication Date |
|---|---|
| CN112467065A true CN112467065A (en) | 2021-03-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011308532.3A Pending CN112467065A (en) | 2020-11-20 | 2020-11-20 | Rapid and efficient preparation method of lithium ion battery slurry, pole piece and battery thereof |
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| CN (1) | CN112467065A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103545527A (en) * | 2013-10-31 | 2014-01-29 | 河北洁神新能源科技有限公司 | Battery slurry dispersant as well as preparation method and application thereof |
| CN103872306A (en) * | 2014-03-24 | 2014-06-18 | 四川剑兴锂电池有限公司 | Preparation method of lithium titanate negative electrode slurry |
| WO2017032144A1 (en) * | 2015-08-25 | 2017-03-02 | 田东 | Method for preparing lithium iron phosphate cathode slurry |
| CN108636145A (en) * | 2018-04-27 | 2018-10-12 | 广州市云通磁电股份有限公司 | A kind of dry method slurry preparation technique |
| CN109192941A (en) * | 2018-08-10 | 2019-01-11 | 欣旺达电子股份有限公司 | Lithium ion battery, positive plate, lithium ion battery anode glue size and preparation method thereof |
| CN110707318A (en) * | 2019-08-06 | 2020-01-17 | 湖南华慧新能源股份有限公司 | Preparation method of lithium titanate battery negative electrode slurry |
-
2020
- 2020-11-20 CN CN202011308532.3A patent/CN112467065A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103545527A (en) * | 2013-10-31 | 2014-01-29 | 河北洁神新能源科技有限公司 | Battery slurry dispersant as well as preparation method and application thereof |
| CN103872306A (en) * | 2014-03-24 | 2014-06-18 | 四川剑兴锂电池有限公司 | Preparation method of lithium titanate negative electrode slurry |
| WO2017032144A1 (en) * | 2015-08-25 | 2017-03-02 | 田东 | Method for preparing lithium iron phosphate cathode slurry |
| CN108636145A (en) * | 2018-04-27 | 2018-10-12 | 广州市云通磁电股份有限公司 | A kind of dry method slurry preparation technique |
| CN109192941A (en) * | 2018-08-10 | 2019-01-11 | 欣旺达电子股份有限公司 | Lithium ion battery, positive plate, lithium ion battery anode glue size and preparation method thereof |
| CN110707318A (en) * | 2019-08-06 | 2020-01-17 | 湖南华慧新能源股份有限公司 | Preparation method of lithium titanate battery negative electrode slurry |
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Application publication date: 20210309 |
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