CN113937292A - Electrode inhibitor, application thereof and preparation method of battery pole piece - Google Patents
Electrode inhibitor, application thereof and preparation method of battery pole piece Download PDFInfo
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- CN113937292A CN113937292A CN202111028493.6A CN202111028493A CN113937292A CN 113937292 A CN113937292 A CN 113937292A CN 202111028493 A CN202111028493 A CN 202111028493A CN 113937292 A CN113937292 A CN 113937292A
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- pole piece
- glue solution
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- battery pole
- electrode
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- 239000003112 inhibitor Substances 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000002033 PVDF binder Substances 0.000 claims abstract description 27
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims abstract description 25
- 239000011248 coating agent Substances 0.000 claims abstract description 24
- 238000000576 coating method Methods 0.000 claims abstract description 24
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims abstract description 21
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims abstract description 21
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims abstract description 21
- 239000003292 glue Substances 0.000 claims description 37
- 239000002904 solvent Substances 0.000 claims description 33
- 238000001035 drying Methods 0.000 claims description 23
- 239000011247 coating layer Substances 0.000 claims description 20
- 239000002002 slurry Substances 0.000 claims description 20
- 239000011149 active material Substances 0.000 claims description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 12
- 229910052782 aluminium Inorganic materials 0.000 claims description 12
- 239000011888 foil Substances 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 12
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 239000011889 copper foil Substances 0.000 claims description 8
- 239000006258 conductive agent Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 235000006408 oxalic acid Nutrition 0.000 claims description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 16
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 16
- 238000005336 cracking Methods 0.000 abstract description 7
- 239000013078 crystal Substances 0.000 abstract description 6
- 239000011230 binding agent Substances 0.000 abstract description 2
- 239000006255 coating slurry Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 10
- 239000007787 solid Substances 0.000 description 9
- 238000007600 charging Methods 0.000 description 7
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000007773 negative electrode material Substances 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 125000003625 D-valyl group Chemical group N[C@@H](C(=O)*)C(C)C 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 description 1
- HFCVPDYCRZVZDF-UHFFFAOYSA-N [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O Chemical compound [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O HFCVPDYCRZVZDF-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010280 constant potential charging Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008707 rearrangement Effects 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses an electrode inhibitor, application thereof and a preparation method of a battery pole piece, wherein the electrode inhibitor comprises the following components in percentage by mass: 10 to 30 percent of hydroxyethyl cellulose and 70 to 90 percent of N-methyl pyrrolidone. The electrode inhibitor is applied to a pole piece of a battery and is mainly added into coating slurry of the pole piece, wherein hydroxyethyl cellulose can react when being heated, so that polyvinylidene fluoride (PVDF) - (C) on the pole piece2H2F2) The n-series binder has the advantages that the crystal form is rearranged (including the step of changing the crystal form from the ordered form to the disordered form), the appearance of a coating film is smooth, the problem of pole piece cracking caused by the semi-crystallinity of the polyvinylidene fluoride during the rapid thick coating film is inhibited, and the capacity, the rate performance and the like of the lithium ion battery are improved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to an electrode inhibitor, application thereof and a preparation method of a battery pole piece.
Background
With the increasing demands for the performance and functions of electronic devices, higher requirements are also put on the performance of lithium ion batteries, and it is desirable that batteries are smaller, thinner and larger in capacity, and at the same time, the charging speed of the batteries is higher. The above requirements are also driving the research work of lithium ion batteries to advance continuously, and from the adoption of battery structures, new materials and new systems, the energy density and the charge rate performance of the batteries are improved, and the specific energy of the lithium ion batteries is structurally improved, so that the proportion of positive and negative active materials in the lithium ion batteries is improved.
The lithium ion battery mainly comprises positive and negative electrode active materials, a diaphragm, a copper foil, an aluminum foil, a shell, a structural component and the like, wherein only the active materials which can really provide capacity for the lithium ion battery are provided, so that the most effective means for improving the lithium ion battery is to improve the proportion of the active materials in the lithium ion battery. While the active material is continuously increased, other auxiliary materials of the lithium battery are continuously reduced, and the optimal state of the product is also required to be achieved while the quantity of the auxiliary materials is reduced, such as: the coating thickness of the anode and the cathode is increased, and the thickness of the copper foil, the aluminum foil and the diaphragm is reduced. However, in the case of a thick coating, the PVDF semi-crystallinity on the surface of the coating causes the problem of pole piece cracking in the case of a fast thick coating, and the problem needs to be solved at present.
Disclosure of Invention
The invention aims to solve the technical problem of providing an electrode inhibitor for solving the problem of pole piece cracking, application thereof and a preparation method of a battery pole piece using the electrode inhibitor.
The technical scheme adopted by the invention for solving the technical problems is as follows: the electrode inhibitor comprises the following components in percentage by mass: 10 to 30 percent of hydroxyethyl cellulose and 70 to 90 percent of N-methyl pyrrolidone.
Preferably, the electrode inhibitor is a solution obtained by mixing the hydroxyethyl cellulose and the N-methyl pyrrolidone.
The invention also provides application of the electrode inhibitor to a battery pole piece.
The invention also provides a preparation method of the battery pole piece, which comprises the following steps:
s1, dissolving PVDF in a solvent to form a first glue solution, adding the electrode inhibitor into the first glue solution, and uniformly mixing to form a second glue solution;
s2, adding a conductive agent and an active material into the second glue solution, and dispersing at a high speed to form uniform and stable slurry;
and S3, coating the slurry on the surface of an aluminum foil, drying to remove the solvent to form a coating layer, and forming a battery pole piece together with the aluminum foil.
Preferably, in the coating layer, the hydroxyethyl cellulose accounts for 0.24-1.0% of the coating layer by mass.
Preferably, in step S1, the solvent is N-methylpyrrolidone.
Preferably, in step S3, the solvent removed in the baking includes the solvent in step S1 and N-methylpyrrolidone in the electrode inhibitor.
The invention also provides another preparation method of the battery pole piece, which comprises the following steps:
s1, dissolving PVDF in a solvent to form a first glue solution, adding the electrode inhibitor into the first glue solution, and uniformly mixing to form a second glue solution;
s2, adding a conductive agent and oxalic acid into the second glue solution to form a conductive glue solution;
s3, adding an active material into the conductive glue solution, and dispersing at a high speed to form uniform and stable slurry;
and S4, coating the slurry on the surface of a copper foil, drying to remove the solvent to form a coating layer, and forming a battery pole piece together with the copper foil.
Preferably, in the coating layer, the hydroxyethyl cellulose accounts for 0.24-1.0% of the coating layer by mass.
Preferably, in step S4, the solvent removed in the baking includes the solvent in step S1 and N-methylpyrrolidone in the electrode inhibitor.
The electrode inhibitor is applied to a pole piece of a battery and is mainly added into coating slurry of the pole piece, wherein hydroxyethyl cellulose can react when being heated, so that polyvinylidene fluoride (PVDF) - (C) on the pole piece2H2F2) The n-series binder generates rearrangement of crystal form (including changing the crystal form from ordered form to disordered form), and the formed coating film layer has flat appearance, and the problem of pole piece cracking caused by the semi-crystallinity of polyvinylidene fluoride (PVDF) during rapid thick coating is inhibitedThereby improving the capacity, rate capability and the like of the lithium ion battery.
In addition, the adhesive force of the lithium ion battery pole piece can be improved, the production yield of the pole piece is improved, and the internal resistance of the battery is reduced.
Detailed Description
The electrode inhibitor comprises the following components in percentage by mass: 10 to 30 percent of hydroxyethyl cellulose and 70 to 90 percent of N-methyl pyrrolidone.
The electrode inhibitor is a solution, and is mainly obtained by mixing hydroxyethyl cellulose (HEC) and N-methyl pyrrolidone. Hydroxyethyl cellulose of the formula (C)2H6O2) n, as a solute; n-methylpyrrolidone of formula C5H9NO, as a solvent, dissolves the hydroxyethylcellulose therein, forming a solution with a certain solids content.
The electrode inhibitor is used in the battery pole piece, and can solve the problem of pole piece cracking. The battery pole piece comprises a negative pole piece and a positive pole piece of the battery. In practical application, the specific content of the hydroxyethyl cellulose in the battery inhibitor can be adjusted within the range of 10-30% according to the viscosity requirement, the dosage and the like during application.
When the battery inhibitor is used for the positive pole piece of the battery, the preparation method of the battery pole piece comprises the following steps:
s1, dissolving PVDF (polyvinylidene fluoride) in a solvent to form a first glue solution, adding an electrode inhibitor into the first glue solution, and uniformly mixing to form a second glue solution.
According to the PVDF choice, the solvent used is N-methylpyrrolidone (NMP).
And S2, adding a conductive agent and an active material into the second glue solution, and dispersing at a high speed to form uniform and stable slurry.
The rotating speed during high-speed dispersion can be 1500r/min-4000 r/min.
The corresponding pole piece is a positive pole piece, and the active material can be selected from nickel cobalt lithium manganate, lithium cobaltate, lithium iron phosphate and the like, and can be realized by the prior art.
And S3, coating the slurry on the surface of the aluminum foil, drying to remove the solvent to form a coating layer, and forming the battery pole piece by the coating layer and the aluminum foil.
After drying, the removed solvent includes the solvent in step S1 and N-methylpyrrolidone in the electrode inhibitor. In the coating layer, the hydroxyethyl cellulose accounts for 0.24-1.0% of the coating layer by mass.
In some embodiments, the drying may be performed in multiple sequential steps, such as sequentially heating and drying, and then cooling. For example, when six drying processes are performed in sequence, the first drying temperature is 75 ℃ ± 10 ℃, the second drying temperature is 85 ℃ ± 10 ℃, the third and fourth drying temperatures are 95 ℃ ± 10 ℃, the fifth drying temperature is 105 ℃ ± 10 ℃, and the sixth drying temperature is 85 ℃ ± 10 ℃.
When the battery inhibitor is used for a negative pole piece of a battery, the preparation method of the battery pole piece comprises the following steps:
s1, dissolving PVDF (polyvinylidene fluoride) in a solvent to form a first glue solution, adding an electrode inhibitor into the first glue solution, and uniformly mixing to form a second glue solution.
According to the PVDF choice, the solvent used is N-methylpyrrolidone (NMP).
And S2, adding a conductive agent and oxalic acid into the second glue solution to form a conductive glue solution.
And S3, adding an active material into the conductive glue solution, and dispersing at a high speed to form uniform and stable slurry.
The rotating speed during high-speed dispersion can be 1500r/min-4000 r/min.
The corresponding pole piece is a negative pole piece, and the active material can be silicon carbon, lithium titanate, carbon and the like, and can be realized by the prior art.
And S4, coating the slurry on the surface of the copper foil, drying to remove the solvent to form a coating layer, and forming the battery pole piece by the coating layer and the copper foil.
After drying, the removed solvent includes the solvent in step S1 and N-methylpyrrolidone in the electrode inhibitor. In the coating layer, the hydroxyethyl cellulose accounts for 0.24-1.0% of the coating layer by mass.
The preparation of the battery pole pieceIn the process, in the drying stage after coating, hydroxyethyl cellulose in the electrode inhibitor reacts to polyvinylidene fluoride (PVDF) - (C) when being heated2H2F2) The n-series adhesive has rearranged crystal form (including changing the crystal form from ordered form to disordered form), improves the adhesion force of the battery pole piece, improves the production yield of the pole piece and reduces the internal resistance of the battery. And the addition of the electrode inhibitor can inhibit the problem of pole piece cracking caused by the semi-crystallinity of polyvinylidene fluoride during film coating when a thick film is rapidly coated, so that the formed coating film layer has a smooth appearance, and the capacity, the rate capability and the like of the lithium ion battery are further improved.
The invention is further illustrated by the following specific examples.
Example 1
As an example, active material (LFP), SP (conductive carbon black), PVDF, electrode inhibitor 92.52:4:3: 0.48:
firstly, preparing 30g of PVDF glue solution with the solid content of 5% by using NMP, adding 0.82g of electrode inhibitor, and stirring to form uniform glue solution; weighing 2.01g of SP and 46.5g of LFP in sequence, adding 27.6g of NMP, dispersing at high speed (2000r/min) for 15min, and uniformly mixing to obtain slurry with the solid content of 47.0%; coating the slurry on the surface of an aluminum foil by using coating equipment, and drying the solvent at 105 ℃ to obtain a pole piece; the lithium ion battery is obtained through flaking, assembling, forming and grading.
Example 2
Take LCO (lithium cobaltate), SP: PVDF: electrode inhibitor 97.46:1:1.3:0.24 as an example:
firstly, preparing 13g of PVDF glue solution with the solid content of 5% by using NMP, adding 0.4g of electrode inhibitor, and stirring to form a uniform solution; 0.5g of SP and 48.85g of LCO are weighed in sequence, 11.0g of NMP is added, and the mixture is uniformly mixed after being dispersed at high speed (2000r/min) for 15min to obtain slurry with solid content of 68.0%. Coating the slurry on the surface of an aluminum foil by using coating equipment, and drying the solvent at 105 ℃ to obtain a pole piece; the lithium ion battery is obtained through flaking, assembling, forming and grading.
Example 3
Taking as an example the active material (LFP), SP (conductive carbon black), PVDF, electrode inhibitor 92:4:3: 1:
firstly, preparing 30g of PVDF glue solution with the solid content of 5% by using NMP, adding 1.72g of electrode inhibitor, and stirring to form uniform glue solution; weighing 2.02g of SP and 46.5g of LFP in sequence, adding 27.6g of NMP, dispersing at a high speed (2000r/min) for 15min, and uniformly mixing to obtain slurry with the solid content of 46.9%; coating the slurry on the surface of an aluminum foil by using coating equipment, and drying the solvent at 105 ℃ to obtain a pole piece; the lithium ion battery is obtained through flaking, assembling, forming and grading.
Comparative example 1
Taking the active material SP: PVDF 93:4:3 as an example:
firstly, preparing 30g of PVDF glue solution with the solid content of 5% by using NMP, and stirring to form uniform glue solution; sequentially weighing 2.0g of SP and 46.5g of LFP, adding 27.6g of NMP, dispersing at a high speed (2000r/min) for 15min, and uniformly mixing to obtain slurry with the solid content of 47.1%; coating the slurry on the surface of an aluminum foil by using coating equipment, and drying the solvent at 105 ℃ to obtain a pole piece; the lithium ion battery is obtained through flaking, assembling, forming and grading.
The pole pieces obtained in examples 1 to 3 and comparative example 1 above were compared as follows:
the surfaces of the pole pieces of examples 1 to 3 were flat and smooth, and the surfaces of the pole pieces of comparative example 1 were cracked to form irregular cracks.
The properties of the pole pieces of examples 1 to 3 and comparative example 1 are shown in table 1 below.
TABLE 1
As can be seen from the comparison, the peel strength of the pole pieces prepared in examples 1-3 of the present invention is significantly higher than that of the pole piece prepared in comparative example 1.
The gram capacities of the batteries obtained in examples 1 to 3 and comparative example 1, which were measured according to the standard charge and the standard discharge, are shown in the following table 2.
TABLE 2
As can be seen from comparison of the data in table 2, the internal resistances of the batteries prepared in examples 1 to 3 of the present invention were lower than the internal resistance of the battery prepared in comparative example 1, and the average efficiency, the specific charge capacity, and the specific discharge capacity were higher than those of comparative example 1.
The batteries obtained in examples 1 to 3 and comparative example 1 were subjected to an ordinary temperature rate discharge test, an ordinary temperature rate charge test, a 25 ℃ cycle test, and a 45 ℃ cycle test, respectively.
Normal temperature rate discharge test: discharging in standard charging and discharging manner, standing for 10min, and charging the battery at room temperature with constant current of 0.33C, 1C, 2C, 3C, 4C and upper limit voltage of 4.2V. The results are shown in Table 3.
Normal temperature multiplying power charging test: charging to 4.2V at 0.5C; 4.2V constant voltage charging to 0.05C; standing for 10min, and performing discharge test at room temperature with currents of 0.33C, 1C, 2C, 3C and 4C to obtain a final voltage of 3.0V. And after each discharge rate is finished, the battery is fully charged according to a standard charging mode. The results are shown in Table 4.
Cycle test at 25 ℃: standard charging mode 0.5C, discharging mode 0.33C; 3.0V-4.2V; off current 0.05C. The results are shown in Table 5.
45 ℃ cycle test: the standard charge and discharge mode is +0.5C, and the discharge mode is 0.33C; 3.0V-4.2V; the current was cut off at 0.05C and the cycle was 250 times. The results are shown in Table 6.
TABLE 3 Normal temperature Rate discharge test results
TABLE 4 Normal temperature Rate Charge test results
TABLE 5.25 ℃ Cyclic test results
Note: the test was averaged three times per cycle.
TABLE 6.45 ℃ Cyclic test results
Note: the test was averaged three times per cycle.
From the test results shown in tables 3-6, it can be seen that the battery of the present invention, with the addition of hydroxyethyl cellulose, not only solves the problem of cracking of the existing electrode sheet, but also has higher battery capacity and rate capability than the battery prepared by the prior art (e.g., comparative example 1).
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The electrode inhibitor is characterized by comprising the following components in percentage by mass: 10 to 30 percent of hydroxyethyl cellulose and 70 to 90 percent of N-methyl pyrrolidone.
2. The electrode inhibitor according to claim 1, wherein the electrode inhibitor is a solution obtained by mixing the hydroxyethylcellulose and the N-methylpyrrolidone.
3. Use of the electrode inhibitor according to claim 1 or 2 in a battery pole piece.
4. The preparation method of the battery pole piece is characterized by comprising the following steps:
s1, dissolving PVDF in a solvent to form a first glue solution, adding the electrode inhibitor of claim 1 or 2 into the first glue solution, and uniformly mixing to form a second glue solution;
s2, adding a conductive agent and an active material into the second glue solution, and dispersing at a high speed to form uniform and stable slurry;
and S3, coating the slurry on the surface of an aluminum foil, drying to remove the solvent to form a coating layer, and forming a battery pole piece together with the aluminum foil.
5. The preparation method of the battery pole piece according to claim 4, wherein in the coating layer, the hydroxyethyl cellulose accounts for 0.24-1.0% by mass of the coating layer.
6. The method for preparing the battery pole piece according to claim 4, wherein in the step S1, the solvent is N-methylpyrrolidone.
7. The method for preparing the battery pole piece according to claim 4, wherein in the step S3, the solvent removed in the drying process comprises the solvent in the step S1 and N-methyl pyrrolidone in the electrode inhibitor.
8. The preparation method of the battery pole piece is characterized by comprising the following steps:
s1, dissolving PVDF in a solvent to form a first glue solution, adding the electrode inhibitor of claim 1 or 2 into the first glue solution, and uniformly mixing to form a second glue solution;
s2, adding a conductive agent and oxalic acid into the second glue solution to form a conductive glue solution;
s3, adding an active material into the conductive glue solution, and dispersing at a high speed to form uniform and stable slurry;
and S4, coating the slurry on the surface of a copper foil, drying to remove the solvent to form a coating layer, and forming a battery pole piece together with the copper foil.
9. The preparation method of the battery pole piece according to claim 8, wherein in the coating layer, the hydroxyethyl cellulose accounts for 0.24-1.0% by mass of the coating layer.
10. The method of claim 8, wherein in step S4, the solvent removed during drying includes the solvent in step S1 and N-methylpyrrolidone in the electrode inhibitor.
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| WO2013085509A1 (en) * | 2011-12-07 | 2013-06-13 | CNano Technology Limited | Electrode composition for li ion battery |
| CN106374110A (en) * | 2016-11-23 | 2017-02-01 | 湖南三迅新能源科技有限公司 | Lithium ion battery cathode composite cathode, preparation method thereof, and lithium ion battery |
| CN107925091A (en) * | 2016-03-29 | 2018-04-17 | 株式会社Lg化学 | The method for preparing electrode slurry |
-
2021
- 2021-09-02 CN CN202111028493.6A patent/CN113937292B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030057226A (en) * | 2001-12-28 | 2003-07-04 | 주식회사 엘지화학 | Stripe coated electrode and method for preparing the same |
| CN102185126A (en) * | 2011-03-23 | 2011-09-14 | 中信国安盟固利动力科技有限公司 | Method for dispersing micro-scale and nano-scale electrode materials |
| WO2013085509A1 (en) * | 2011-12-07 | 2013-06-13 | CNano Technology Limited | Electrode composition for li ion battery |
| CN107925091A (en) * | 2016-03-29 | 2018-04-17 | 株式会社Lg化学 | The method for preparing electrode slurry |
| CN106374110A (en) * | 2016-11-23 | 2017-02-01 | 湖南三迅新能源科技有限公司 | Lithium ion battery cathode composite cathode, preparation method thereof, and lithium ion battery |
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