CN112750973A - Pole piece unit and preparation method thereof - Google Patents
Pole piece unit and preparation method thereof Download PDFInfo
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- CN112750973A CN112750973A CN202011634321.9A CN202011634321A CN112750973A CN 112750973 A CN112750973 A CN 112750973A CN 202011634321 A CN202011634321 A CN 202011634321A CN 112750973 A CN112750973 A CN 112750973A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 238000000576 coating method Methods 0.000 claims abstract description 75
- 239000011248 coating agent Substances 0.000 claims abstract description 67
- 238000000034 method Methods 0.000 claims abstract description 22
- 229920000642 polymer Polymers 0.000 claims abstract description 16
- 239000003792 electrolyte Substances 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000001035 drying Methods 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 8
- 238000005096 rolling process Methods 0.000 claims description 5
- -1 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000002033 PVDF binder Substances 0.000 claims description 3
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 3
- 239000004642 Polyimide Substances 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 229920000058 polyacrylate Polymers 0.000 claims description 3
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 15
- 229910052744 lithium Inorganic materials 0.000 abstract description 15
- 239000011149 active material Substances 0.000 abstract description 14
- 230000008569 process Effects 0.000 abstract description 13
- 238000001556 precipitation Methods 0.000 abstract description 7
- 230000003139 buffering effect Effects 0.000 abstract description 3
- 238000000354 decomposition reaction Methods 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract 1
- 239000011247 coating layer Substances 0.000 description 6
- 230000006378 damage Effects 0.000 description 4
- 230000008021 deposition Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000012797 qualification Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000013543 active substance Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
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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
- H01M4/0402—Methods of deposition of the material
- H01M4/0409—Methods of deposition of the material by a doctor blade method, slip-casting or roller coating
-
- 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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
-
- 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
- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0435—Rolling or calendering
-
- 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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
-
- 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
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention provides a pole piece unit and a preparation method thereof, the pole piece unit comprises a pole piece and diaphragms superposed on two sides of the pole piece, and coatings are respectively arranged on the edges of the end surfaces of the two sides of the pole piece, or coatings respectively covering the edges of the two sides of the pole piece are arranged on the end surface of one side of each diaphragm, which is opposite to the pole piece, and the coating raw materials adopt the following components in mass ratio of 1: 1 solution of mixed, electrolyte-insoluble polymer and N-methylpyrrolidone. According to the pole piece unit, the coating is arranged, so that the lithium precipitation of the negative electrode and the capacity loss of the battery can be reduced, the overcharge phenomenon caused by overlarge local current in the charging process of the battery is improved, the decomposition of electrolyte is reduced, the binding force of an active material at the edge of the pole piece and a current collector is increased, and the active material at the edge of the pole piece is prevented from falling off and being damaged, so that the safety of the battery is improved, and the production cost of the battery is reduced; in addition, the pole piece unit can play a role in buffering when being vibrated or extruded, so that the pole group is effectively protected, and the safety performance is further improved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a pole piece unit. Meanwhile, the invention also relates to a preparation method of the pole piece unit.
Background
With the intelligent development of the electrical appliance industry and the popularization of electric vehicles, people have increasingly growing demand for energy density of batteries, but the problem of safety of the batteries is increasingly prominent, and the production cost of the batteries is also rapidly increased. At present, various large battery manufacturers seek to improve the energy density of the battery, and pay more attention to the problems of reducing the production cost of the battery, improving the safety of the battery, and the like.
There are two main safety hazards to batteries: short circuit and overcharge. Among them, the short circuit is divided into an inner short circuit and an outer short circuit, the outer short circuit is uncontrollable due to a complicated external factor, but the inner short circuit can be improved by various strategies. Overcharge, that is, overcharge, may cause irreversible changes in the battery, resulting in excessive energy being stored in the battery, causing violent reactions, temperature rise, and even explosion in the battery; the harm can be improved by an external intelligent charging and discharging device; a local overcharge process exists in the battery, so that the damage is small, but the performance of the battery is greatly influenced, and the reversible capacity, the service life and the stability of the battery can be reduced; if the local overcharge is accumulated for a long time, the battery can be damaged, and even safety accidents can occur.
In addition, the laminated battery stacks the pole pieces together by folding the diaphragm into a Z shape, the number of the pole pieces is large, and the pole pieces are stacked; in the stacking process, the edge part of the pole piece is stressed more, and after the battery is subjected to long-time vibration or long-time circulation, the active material at the edge of the pole piece is easy to fall off and fold, so that potential short circuit risks and even safety accidents are caused for the battery.
In addition, because the thickness of the edge of the pole piece is not uniform, even after rolling, the flatness of the edge of the pole piece is still difficult to ensure, and the uneven pole piece is easy to cause larger overpotential, so that lithium is deposited on the surface of a negative electrode material, and the phenomenon of lithium precipitation occurs, thereby affecting the performance of the battery; the continuous occurrence of the lithium deposition phenomenon may penetrate the separator in severe cases, causing an internal short circuit of the battery.
In order to improve the performance of the battery, people pay more attention to the manufacturing process of the pole piece in the prior art, and generally improve the qualification rate of the pole piece by improving the methods of a binder, the viscosity of slurry, the proportion of an active material and the like; however, with the increase of productivity, the method of improving the adhesion between the pole pieces is difficult to cope with the current situation of pole piece loss caused in the production and transportation process, and has no great effect on the lithium precipitation phenomenon at the edge part of the pole piece and the local overcharge of the edge.
Disclosure of Invention
In view of the above, the present invention is directed to a pole piece unit, which can improve the safety performance of a battery.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a pole piece unit comprises pole pieces and diaphragms superposed on two sides of the pole pieces, wherein coatings are respectively arranged on the two side edges of the pole pieces on the end faces of the two sides of the pole pieces, or coatings respectively covering the two side edges of the pole pieces are arranged on the end faces of one side, right opposite to the pole pieces, of each diaphragm, and the coatings are prepared by the following steps: 1 mixed electrolyte insoluble polymer and N-methyl pyrrolidone.
Furthermore, the polymer is one or a mixture of more of polyvinylidene fluoride, polytetrafluoroethylene, polyacrylate, polyimide, polyacrylonitrile, polysilicone and polyethylene oxide resin.
Further, the thickness of the coating is between 20 and 1000 μm.
Further, the coating is arranged on the pole piece, and the width of the coating is between 10 and 20 mm.
Further, the coating is arranged on the diaphragm and aligned with the edge of the pole piece, and the width of the coating is between 10 and 20 mm.
Further, the coating is arranged on the diaphragm and positioned at the edge of the diaphragm, the inner side of the coating covers the edge of the pole piece, and the covering width is 5-15 mm.
Further, the pole piece is a negative pole piece.
Compared with the prior art, the invention has the following advantages:
according to the pole piece unit, the coating is arranged, so that the lithium precipitation of the negative electrode and the capacity loss of the battery can be reduced, the overcharge phenomenon caused by overlarge local current in the charging process of the battery is improved, the decomposition of electrolyte is reduced, the binding force of an active material at the edge of the pole piece and a current collector is increased, and the active material at the edge of the pole piece is prevented from falling off and being damaged, so that the safety of the battery is improved, and the production cost of the battery is reduced; in addition, the pole piece unit can play a role in buffering when being vibrated or extruded, so that the pole group is effectively protected, and the safety performance is further improved.
Another objective of the present invention is to provide a method for preparing the above pole piece unit, wherein the method comprises:
mixing a polymer insoluble in an electrolyte and N-methyl pyrrolidone according to a mass ratio of 1: 1, mixing the two components into a solution, respectively coating the solution on the edges of the two sides of the end faces of the two sides of the pole piece to form a coating, and respectively arranging the diaphragms on the two sides of the pole piece after drying to obtain a pole piece unit;
or,
mixing a polymer insoluble in an electrolyte and N-methyl pyrrolidone according to a mass ratio of 1: 1, mixing the two parts into a solution, coating the solution on the end face of one side of each diaphragm, which is opposite to the pole piece, to form a coating layer covering the edges of the two sides of the pole piece respectively, and drying the two parts, and then respectively arranging the diaphragms on the two sides of the pole piece to obtain the pole piece unit.
Furthermore, when the solution is coated, the flow channel speed of the spray head is between 1 and 5ml/s, and the drying temperature is between 60 and 160 ℃.
Further, after the coating is formed on the pole piece and dried, rolling the pole piece and cutting two side edges of the pole piece; or, after the coating layer is formed on the diaphragm and dried, rolling the diaphragm.
Compared with the pole piece unit in the Western Europe technology, the preparation method of the pole piece unit has the same beneficial effects as the pole piece unit in the Western Europe technology, and the details are not repeated.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a pole piece unit according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a pole piece according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a test result of the voltage at the negative electrode of the pole piece unit according to the embodiment of the present invention.
Description of reference numerals:
1. pole pieces; 2. coating; 3. a diaphragm.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The present invention relates to a pole piece unit, which mainly comprises a pole piece 1 and a diaphragm 3 superposed on both sides of the pole piece 1, as shown in fig. 1 and 2. In order to effectively improve the safety performance of the pole piece unit, the edge parts of the pole piece 1 or the diaphragm 3 corresponding to the two sides of the pole piece 1 are provided with coatings 2, and the coatings 2 are prepared by mass ratio of 1: 1 mixed electrolyte insoluble polymer and N-methyl pyrrolidone.
Therefore, in the present invention, first, a coating solution suitable for a coating process is provided, and the coating solution is specifically a coating solution comprising an electrolyte-insoluble polymer and N-methylpyrrolidone in a mass ratio of 1: 1, wherein the polymer can adopt one or a mixture of more of polyvinylidene fluoride, polytetrafluoroethylene, polyacrylate, polyimide, polyacrylonitrile, polysilicone and polyethylene oxide resin.
Meanwhile, the invention also relates to a preparation method for preparing the pole piece unit by applying the coating solution. For better understanding of the present invention, the structure of the electrode sheet 1 is briefly described, and the electrode sheet 1 mainly includes a current collector and conductive layers made of active materials and covering both sides of the current collector.
The preparation method comprises the following steps of coating the coating solution on the edges of two sides of the end faces of two sides of the pole piece 1 to form a coating 2, and respectively arranging diaphragms 3 on two sides of the pole piece 1 after drying according to the prior art to obtain the pole piece unit. In the step, the drying can be performed by any mode such as an oven, an infrared lamp tube or hot air.
After the coating 2 is formed on the pole piece 1 and dried, the pole piece 1 can be rolled to prevent the edge thickness of the pole piece 1 from exceeding the standard. Besides, the edges of the two sides of the pole piece 1 can be cut to remove the uneven coating part, so that the appearance quality of the pole piece 1 is effectively guaranteed.
In the above process, the flow path speed of the nozzle is preferably controlled to be 1 to 5ml/s, for example, 1ml/s or 5ml/s, when the solution is applied; and the drying temperature is preferably controlled between 60 ℃ and 160 ℃, such as 60 ℃, 80 ℃, 100 ℃, 110 ℃, 130 ℃, 150 ℃ or 160 ℃. The thickness of the coating 2 is preferably controlled between 20-1000 μm, e.g. it may be 20 μm, 120 μm, 200 μm, 400 μm, 600 μm, 800 μm or 1000 μm. The width of the coating 2 is preferably controlled between 10-20mm, e.g. it may be 10mm, 12mm, 15mm, 18mm or 20 mm.
The coating solution of the present invention is described below with reference to specific preparation examples, and the components and the proportions of the preparation examples can be specifically shown in table 1:
table 1: components and proportion of coating solution
The coating solutions of preparation examples 1 to 7 were applied to different pole pieces, respectively, at a coating thickness of 120 μm and a coating width of 10 mm. Compared with the existing pole piece without the coating, the pole piece unit with the coating 2 has the advantages that the falling of the active material on the edge of the pole piece 1 is obviously reduced compared with the existing pole piece unit without the coating 2 through visual inspection or microscopic inspection. Through the detection of the stripping force, the separation of the active material and the current collector on the pole piece 1 needs a larger stripping force, and the adhesion between the active material and the current collector is proved to be larger.
In order to further verify the safety performance of the pole piece 1, the invention also performs a voltage test, as shown in fig. 3, which is a comparison graph of test results of testing the voltage of the pole piece of the preparation example 1 and the existing pole piece by adopting a three-electrode system under 1C constant voltage and constant current, and the voltage at the negative electrode under 0V is taken as a possible occurrence stage of lithium analysis. As can be seen from fig. 3, the lithium-separation potential of the negative electrode sheet 1 provided with the coating 2 is significantly higher than that of the negative electrode sheet 1 not provided with the coating 2, so that the lithium-separation risk of the battery can be effectively reduced. The intrinsic mechanism of the method is that the overpotential caused by uneven current distribution is accumulated due to the large size of the pole piece 1, so that the lithium precipitation potential of the pole piece 1 is higher and generally more at the edge of the pole piece 1, and therefore the potential at the edge of the pole piece 1 can be effectively improved by adding the coating 2, and the lithium precipitation risk of the pole piece unit is reduced.
It should be noted that, in the above pole piece unit, in addition to the coating layer 2 disposed on the pole piece 1, the coating solution may be coated on the end surface of one side of each membrane 3 opposite to the pole piece 1 to form the coating layers 2 respectively covering the edges of the two sides of the pole piece 1, and after drying, each membrane 3 is disposed on the two sides of the pole piece 1, so as to obtain the pole piece unit. In the step, after the coating 2 is formed on the diaphragm 3 and dried, the diaphragm 3 can be rolled to prevent the edge thickness of the pole piece 1 from exceeding the standard.
In a preferred embodiment, the coating 2 is arranged in line with the edges of the pole piece 1 and the width of the coating 2 is between 10-20mm, e.g. it may be 10mm, 12mm, 15mm, 18mm or 20 mm. In addition, the coating 2 can be provided on the edge of the separator 3, and the inner side of the coating 2 can be covered on the edge of the pole piece 1, and the covering width is 5-15mm, such as 5mm, 8mm, 10mm, 12mm or 15 mm.
Here, it should be noted that, since the positive electrode sheet 1 has relatively few problems, the electrode sheet 1 that needs to be provided with the coating layer 2 in the electrode sheet unit is preferably the negative electrode sheet 1, and in addition to this, the coating layer 2 may be provided corresponding to the edge of the positive electrode sheet 1.
In addition, it should be noted that, two ways of adding the coating 2 on the pole piece 1 and adding the coating 2 on the diaphragm 3 are compared, and the coating 2 is preferably arranged on the pole piece 1, so that the problems of falling off of active materials at the edge of the pole piece 1, overpotential and the like in the battery circulation process can be effectively prevented, and the damage of the pole piece 1 in the transportation process can be prevented.
The pole piece unit of the invention has the following advantages by adding the coating 2 on the edge of the pole piece 1:
1. the thickness of the edge part of the pole piece unit can be increased, so that the binding force between the active material and the current collector in the pole piece 1 is improved.
2. The damage of the pole piece 1 caused by the transportation process of the pole piece 1 can be prevented, the defect of the pole piece 1 or the defect of a core package caused by uneven stress at the edge can be reduced, and the production cost of the battery can be reduced.
3. By coating the high-molecular polymer adhesive and utilizing the adhesiveness between the polymer adhesive and the solid active material, the local overpotential of the pole piece 1 can be reduced, the occurrence of the phenomenon of lithium precipitation of the negative electrode is reduced, the possibility of lithium deposition is reduced, the capacity loss of the battery is reduced, and the safety performance of the battery is improved.
4. The overcharge phenomenon caused by overlarge local current in the charging process of the battery is improved, the decomposition of electrolyte is reduced, and the safety performance of the battery is further improved.
5. Due to the influence of the Z-shaped lamination process, the problems of falling, folding and the like of active substances caused by uneven stress on four corners of the pole piece 1 can be solved in the cutting and lamination processes of the pole piece 1, so that the qualification rate of the battery can be further improved, and the production cost of the battery is reduced.
6. A gelation layer can be constructed on the pole piece 1, so that the pole piece unit can play a role in buffering when being vibrated or extruded, active substances on the surface of the pole piece 1 can be effectively prevented from falling off in the battery circulation process, the pole group can be effectively protected, and the safety performance can be improved.
The pole piece unit has the advantages that the edge of the pole piece 1 can be thickened and the lithium ion diffusion distance can be lengthened by arranging the coating 2, so that the influence of larger local current is counteracted and the risk of lithium deposition is reduced; in addition, through the coating of the high molecular polymer glue, the contact interface between the solid active material and the high molecular polymer glue can be improved, so that the lithium deposition is uniform, the problem of lithium dendrite of 'dead lithium' is not easy to generate, the safety of the battery is improved, the qualification rate can be effectively improved, the production cost is reduced, and the practicability is better.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A pole piece unit comprising a pole piece (1), and a separator (3) superposed on both sides of the pole piece (1), characterized in that: on the both sides terminal surface of pole piece (1), respectively in the both sides edge of pole piece (1) is equipped with coating (2), perhaps, each diaphragm (3) with be equipped with on the just right side terminal surface of pole piece (1) and cover respectively coating (2) of pole piece (1) both sides edge, just coating (2) adopt according to mass ratio 1: 1 mixed electrolyte insoluble polymer and N-methyl pyrrolidone.
2. The pole piece unit of claim 1, wherein: the polymer is one or a mixture of more of polyvinylidene fluoride, polytetrafluoroethylene, polyacrylate, polyimide, polyacrylonitrile, polysiloxane and polyethylene oxide resin.
3. The pole piece unit of claim 1, wherein: the thickness of the coating (2) is between 20 and 1000 μm.
4. The pole piece unit of claim 1, wherein: the coating (2) is arranged on the pole piece (1), and the width of the coating (2) is 10-20 mm.
5. The pole piece unit of claim 1, wherein: the coating (2) is arranged on the diaphragm (3) and is aligned with the edge of the pole piece (1), and the width of the coating (2) is 10-20 mm.
6. The pole piece unit of claim 1, wherein: the coating (2) is arranged on the diaphragm (3) and positioned at the edge of the diaphragm (3), the inner side of the coating (2) covers the edge of the pole piece (1), and the covering width is 5-15 mm.
7. The pole piece unit of any one of claims 1 to 6, wherein: the pole piece (1) is a negative pole piece (1).
8. The method of manufacturing a pole piece unit of claim 1, wherein: the preparation method comprises the following steps:
mixing a polymer insoluble in an electrolyte and N-methyl pyrrolidone according to a mass ratio of 1: 1, mixing the two components into a solution, respectively coating the solution on the edges of the two sides of the end surfaces of the two sides of the pole piece (1) to form a coating (2), and respectively arranging the diaphragms (3) on the two sides of the pole piece (1) after drying to obtain a pole piece unit;
or,
mixing a polymer insoluble in an electrolyte and N-methyl pyrrolidone according to a mass ratio of 1: 1, mixing the two parts into a solution, coating the solution on the end face of one side, which is just opposite to the pole piece (1), of each diaphragm (3) to form a coating (2) which covers the edges of the two sides of the pole piece (1) respectively, and drying the coating and then respectively arranging the diaphragms (3) on the two sides of the pole piece (1) to obtain the pole piece unit.
9. The method for preparing a pole piece unit according to claim 8, wherein the method comprises the following steps: when the solution is coated, the flow channel speed of the spray head is between 1 and 5ml/s, and the drying temperature is between 60 and 160 ℃.
10. The method for preparing a pole piece unit according to claim 8, wherein the method comprises the following steps: after the coating (2) is formed on the pole piece (1) and dried, rolling the pole piece (1) and cutting edges on two sides of the pole piece (1); or, after the coating (2) is formed on the diaphragm (3) and dried, rolling the diaphragm (3) is also included.
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| CN202011634321.9A CN112750973A (en) | 2020-12-31 | 2020-12-31 | Pole piece unit and preparation method thereof |
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| CN202011634321.9A CN112750973A (en) | 2020-12-31 | 2020-12-31 | Pole piece unit and preparation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113299878A (en) * | 2021-05-21 | 2021-08-24 | 珠海冠宇电池股份有限公司 | Negative plate and application thereof |
| CN114552130A (en) * | 2021-09-13 | 2022-05-27 | 万向一二三股份公司 | Pole piece structure for improving lithium ion battery thermal compounding process infiltration |
| CN115360477A (en) * | 2022-09-15 | 2022-11-18 | 珠海冠宇电池股份有限公司 | Separator and battery |
| CN116364852A (en) * | 2023-06-02 | 2023-06-30 | 宁德时代新能源科技股份有限公司 | Battery pole piece, preparation method thereof, electrode assembly, battery and electricity utilization device |
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| CN113299878A (en) * | 2021-05-21 | 2021-08-24 | 珠海冠宇电池股份有限公司 | Negative plate and application thereof |
| WO2022242429A1 (en) * | 2021-05-21 | 2022-11-24 | 珠海冠宇电池股份有限公司 | Negative electrode plate and application thereof |
| CN113299878B (en) * | 2021-05-21 | 2023-12-19 | 珠海冠宇电池股份有限公司 | Negative plate and application thereof |
| CN114552130A (en) * | 2021-09-13 | 2022-05-27 | 万向一二三股份公司 | Pole piece structure for improving lithium ion battery thermal compounding process infiltration |
| CN115360477A (en) * | 2022-09-15 | 2022-11-18 | 珠海冠宇电池股份有限公司 | Separator and battery |
| CN115360477B (en) * | 2022-09-15 | 2023-11-28 | 珠海冠宇电池股份有限公司 | Separator and battery |
| CN116364852A (en) * | 2023-06-02 | 2023-06-30 | 宁德时代新能源科技股份有限公司 | Battery pole piece, preparation method thereof, electrode assembly, battery and electricity utilization device |
| CN116364852B (en) * | 2023-06-02 | 2023-10-20 | 宁德时代新能源科技股份有限公司 | Battery pole piece, preparation method thereof, electrode assembly, battery and electricity utilization device |
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