CN114759163A - Preparation method of positive pole piece structure and positive pole piece structure - Google Patents
Preparation method of positive pole piece structure and positive pole piece structure Download PDFInfo
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- CN114759163A CN114759163A CN202210466599.2A CN202210466599A CN114759163A CN 114759163 A CN114759163 A CN 114759163A CN 202210466599 A CN202210466599 A CN 202210466599A CN 114759163 A CN114759163 A CN 114759163A
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- 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
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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Abstract
The application provides a preparation method of a positive pole piece structure and the positive pole piece structure. The preparation method of the positive pole piece structure comprises the following steps: coating a first active material on one side of a current collector to obtain a first active material layer; coating a second active material on one side of the current collector, which is far away from the first active material layer, to obtain a second active material layer; coating a third active material on one side of the second active material layer, which is far away from the current collector, to obtain a third active material layer; coating a fourth active material on one side of the first active material layer, which is far away from the current collector, to obtain a fourth active material layer, and further obtain a multilayer coating structure; wherein, an insulating region is left on one surface of the current collector, which is adjacent to the fourth active material layer; cold pressing the multilayer coated structure; the insulating layer is coated or attached to the fourth active material layer and the insulating area, so that the insulating layer covers the edge of the fourth active material layer adjacent to the insulating area, the problem that the insulating layer causes overvoltage of the positive pole piece is avoided, and the service performance of the lithium battery is improved.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a preparation method of a positive pole piece structure and the positive pole piece structure.
Background
The conventional positive plate of the current lithium ion battery is to coat active substances on an aluminum foil, but the safety performance of the battery is difficult to ensure along with the improvement of the capacity of the lithium ion battery. In order to improve the safety performance of the battery, an insulating layer is generally coated on the aluminum foil, however, since a certain gap exists between the active material layer and the insulating layer, if the gap is punched, there is a risk of short circuit of the lithium battery. In order to avoid the above gap, in the conventional art, one end of an insulating layer is stacked between adjacent two active material layers, and the other end of the insulating layer is provided on an aluminum foil. However, because the active material layer and the insulating layer have an overlapping portion therebetween, the thickness of the pole piece at the overlapping portion is increased, and then the pole piece has the risk of overvoltage in cold pressing, and further the performance of the battery cell is influenced.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a preparation method of a positive pole piece structure and the positive pole piece structure, which can avoid needle short circuit and avoid overvoltage of the positive pole piece, thereby improving the installation performance and the use performance.
The purpose of the invention is realized by the following technical scheme:
A preparation method of a positive pole piece structure comprises the following steps:
coating a first active material on one side of a current collector to obtain a first active material layer;
coating a second active material on one side of the current collector, which is far away from the first active material layer, so as to obtain a second active material layer;
coating a third active material on one side, away from the current collector, of the second active material layer to obtain a third active material layer;
coating a fourth active material on one side of the first active material layer, which is far away from the current collector, so as to obtain a fourth active material layer and further obtain a multilayer coating structure; wherein an insulating area is reserved on one surface, adjacent to the fourth active material layer, of the current collector;
performing cold pressing operation on the multilayer coating structure to obtain a multilayer compacted structure;
and coating or attaching an insulating layer on the fourth active material layer and the insulating area so that the insulating layer covers the edge of the fourth active material layer adjacent to the insulating area to obtain the positive pole piece structure.
In one embodiment, the first active material, the second active material, the third active material and the fourth active material are at least one of lithium cobaltate, lithium iron phosphate, lithium manganese iron phosphate, sodium iron phosphate, lithium vanadium phosphate, sodium vanadium phosphate, lithium vanadyl phosphate, sodium vanadyl phosphate, lithium vanadyl vanadate, lithium manganate, lithium nickelate, lithium nickel cobalt manganese manganate, lithium rich manganese based material, lithium nickel cobalt aluminate and lithium titanate.
In one embodiment, the first active material, the second active material, the third active material and the fourth active material further comprise a binder.
In one embodiment, the binder is at least one of polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, polyamide, polyacrylonitrile, polyacrylate, polyacrylic acid, polyacrylate, sodium carboxymethyl cellulose, polyvinylpyrrolidone, polyvinyl ether, polymethyl methacrylate, polytetrafluoroethylene, polyhexafluoropropylene, and styrene butadiene rubber.
In one embodiment, the first active material, the second active material, the third active material and the fourth active material further comprise a conductive agent.
In one embodiment, the conductive agent is at least one of carbon nanotubes, conductive carbon black, acetylene black, graphene, ketjen black, and carbon fibers.
In one embodiment, the insulating layer includes at least one of inorganic particles and a polymer.
In one embodiment, the inorganic particles are at least one of alumina, silica, magnesia, titania, hafnia, tin oxide, ceria, nickel oxide, zinc oxide, calcium oxide, zirconia, yttria, silicon carbide, boehmite, aluminum hydroxide, magnesium hydroxide, calcium hydroxide, and barium sulfate.
In one embodiment, the polymer is at least one of a homopolymer of vinylidene fluoride, a copolymer of hexafluoropropylene, polystyrene, polyphenylacetylene, sodium polyvinyl acetate, potassium polyvinyl acetate, polymethyl methacrylate, polyethylene, polypropylene, and polytetrafluoroethylene.
A positive pole piece structure is prepared by the preparation method of the positive pole piece structure in any embodiment.
Compared with the prior art, the invention has at least the following advantages:
1. because the insulating layer covers the boundary line of fourth active material layer and insulating region, the edge that fourth active material layer is close to the insulating region promptly is covered by the insulating layer, does not have exposed clearance between the edge that also promptly the fourth active material layer and the insulating layer, has avoided the acupuncture to cause the problem of short circuit, has improved the security performance of lithium cell.
2. Because the insulating layer is in the coating of cold pressing operation back or laminate in fourth active material layer and insulating area, avoided the insulating layer to lead to the problem of positive pole piece excessive pressure, improved the performance of lithium cell.
3. Because the insulating layer can carry out coating or laminating after the pole piece is colded pressed for the connection quality of insulating layer does not receive the influence of cold pressing operation, and then has improved the connection quality of insulating layer, helps improving the short circuit effect of preventing of insulating layer, and then makes the performance of lithium cell better.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a flowchart illustrating steps of a method for manufacturing a positive electrode sheet structure according to an embodiment;
FIG. 2 is a positive electrode sheet structure obtained by the method for manufacturing a positive electrode sheet structure shown in FIG. 1;
FIG. 3 is a schematic view of a partial structure of the positive electrode sheet shown in FIG. 2;
FIG. 4 is an enlarged schematic view of the positive electrode tab shown in FIG. 3 at A;
fig. 5 is an enlarged schematic view of a position B in the positive electrode sheet structure shown in fig. 4.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The application provides a preparation method of a positive pole piece structure, which comprises the following steps: coating a first active material on one side of a current collector to obtain a first active material layer; coating a second active material on one side of the current collector, which is far away from the first active material layer, to obtain a second active material layer; coating a third active material on one side of the second active material layer, which is far away from the current collector, to obtain a third active material layer; coating a fourth active material on one side of the first active material layer, which is far away from the current collector, to obtain a fourth active material layer, and further obtain a multilayer coating structure; wherein, an insulating region is left on one surface of the current collector, which is adjacent to the fourth active material layer; carrying out cold pressing operation on the multilayer coating structure to obtain a multilayer compacted structure; and coating or attaching the insulating layer to the fourth active material layer and the insulating area so that the insulating layer covers the edge of the fourth active material layer adjacent to the insulating area to obtain the positive pole piece structure.
According to the preparation method of the positive pole piece structure, the insulating layer covers the boundary line of the fourth active material layer and the insulating area, namely the edge of the fourth active material layer adjacent to the insulating area is covered by the insulating layer, namely no exposed gap exists between the edge of the fourth active material layer and the insulating layer, so that the problem of short circuit caused by needling is avoided, and the safety performance of the lithium battery is improved. Because the insulating layer coats or laminates in fourth active material layer and insulating area after the cold pressing operation, avoided the insulating layer to lead to the problem of positive pole piece excessive pressure, improved the performance of lithium cell. Because the insulating layer can carry out coating or laminating after the pole piece is colded pressed for the connection quality of insulating layer does not receive the influence of cold pressing operation, and then has improved the connection quality of insulating layer, helps improving the short circuit effect of preventing of insulating layer, and then makes the performance of lithium cell better.
In order to better understand the technical scheme and the beneficial effects of the present application, the following detailed description is further provided in conjunction with specific embodiments:
as shown in fig. 1, a method for manufacturing a positive electrode sheet structure according to an embodiment includes:
s101: and coating the first active material on one side of the current collector to obtain a first active material layer.
In this embodiment, the current collector is an aluminum foil, and the function of the current collector is mainly to collect the current generated by the active material layer so as to form a larger current to be output. The first active material is prepared into a positive electrode slurry, and then the positive electrode slurry is coated on one side of a current collector to form a first active material layer on one side of the current collector. Further, the positive electrode slurry is coated on part of the surface of one side of the current collector, so that one side of the current collector forms an insulating area.
S103: and coating the second active material on the side of the current collector, which is far away from the first active material layer, so as to obtain a second active material layer.
In this embodiment, the current collector is an aluminum foil, and the current collector mainly functions to collect the current generated by the active material layer so as to form a larger current for outputting. Preparing the second active material into positive electrode slurry, and coating the positive electrode slurry on one side of the current collector, which is far away from the first active material layer, so as to form a second active material layer on one side of the current collector, which is far away from the first active material layer. Further, the first active material layer and the second active material layer are oppositely arranged on two side surfaces of the current collector.
S105: and coating the third active material on the side of the second active material layer, which is far away from the current collector, to obtain a third active material layer.
In this embodiment, the third active material is prepared as a positive electrode slurry, and then the above-described positive electrode slurry is coated on the side of the second active material layer facing away from the current collector to form the third active material layer on the second active material layer.
S107: coating a fourth active material on one side of the first active material layer, which is far away from the current collector, so as to obtain a fourth active material layer and further obtain a multilayer coating structure; and an insulating area is reserved on one surface of the current collector, which is adjacent to the fourth active material layer.
In this example, a fourth active material was prepared as a positive electrode slurry, and the positive electrode slurry was coated on the first active material layer to form a fourth active material layer, so that the current collecting sheet, the first active material layer, the second active material layer, the third active material layer, and the fourth active material layer collectively constituted a multilayer coating structure. Wherein the insulating zone is left to the one side that the mass flow body is close to the fourth active material layer, and the insulating zone is used for adhering to the insulating layer.
S109: and carrying out cold pressing operation on the multilayer coating structure to obtain the multilayer compacted structure.
In the present embodiment, the multilayer coating structure is compacted by the rollers to increase the density of the first, second, third and fourth active material layers to improve the performance of the cell structure.
S111: and coating or attaching the insulating layer to the fourth active material layer and the insulating area so that the insulating layer covers the edge of the fourth active material layer adjacent to the insulating area to obtain the positive pole piece structure.
In this embodiment, the insulating layer is attached to the fourth active material layer and the insulating region by coating or attaching, so that the insulating layer covers an edge of the fourth active material layer adjacent to the insulating region, that is, a gap between the edge of the fourth active material layer and the insulating layer is prevented from being exposed.
According to the preparation method of the positive pole piece structure, the insulating layer covers the boundary line of the fourth active material layer and the insulating area, namely the edge of the fourth active material layer adjacent to the insulating area is covered by the insulating layer, and an exposed gap does not exist between the edge of the fourth active material layer and the insulating layer, so that the problem of short circuit caused by needling is avoided, and the safety performance of the lithium battery is improved. Because the insulating layer is in the coating of cold pressing operation back or laminate in fourth active material layer and insulating area, avoided the insulating layer to lead to the problem of positive pole piece excessive pressure, improved the performance of lithium cell. Because the insulating layer can carry out coating or laminating after the pole piece is colded pressed for the connection quality of insulating layer does not receive the influence of cold pressing operation, and then has improved the connection quality of insulating layer, helps improving the short circuit effect of preventing of insulating layer, and then makes the performance of lithium cell better.
In one embodiment, the first active material, the second active material, the third active material and the fourth active material are at least one of lithium cobaltate, lithium iron phosphate, lithium manganese iron phosphate, sodium iron phosphate, lithium vanadium phosphate, sodium vanadium phosphate, lithium vanadyl phosphate, sodium vanadyl phosphate, lithium vanadate, lithium manganate, lithium nickelate, lithium nickel cobalt manganese manganate, a lithium rich manganese based material, lithium nickel cobalt aluminate and lithium titanate. In the embodiment, the lithium cobaltate is applied to the positive pole piece structure, so that the advantages of 1. restraining battery polarization, reducing heat effect and improving rate performance are achieved; 2. the internal resistance of the battery is reduced, and the dynamic internal resistance amplification in the circulation process is obviously reduced; 3. the consistency is improved, and the cycle life of the battery is prolonged; 4. the adhesive force between the active substance and the current collector is improved, and the manufacturing cost of the pole piece is reduced; 5. protecting the current collector from being corroded by the electrolyte; 6. the processing performance of lithium iron phosphate and lithium titanate materials is improved. In another embodiment, the negative active material is at least one of artificial graphite, natural graphite, mesocarbon microbeads, soft carbon, hard carbon, silicon oxy-compound, silicon-carbon composite, tin alloy, niobium titanate, and lithium titanate.
In one embodiment, the first active material, the second active material, the third active material and the fourth active material further comprise a binder. In this example, the binder is a polymer compound that adheres the active material to the current collector in the fabrication of the electrode. The electrode plate has the main functions of bonding and keeping active substances, enhancing the contact between the active materials and the conductive agent and between the active materials and the current collector, and simultaneously stabilizing the structure of the electrode plate. Further, since the conventional water-soluble binder SBR contains unsaturated double bonds and can be oxidized by a voltage of 4V or more theoretically, the rebound of SBR is relatively large in the processing of the pole piece. Secondly, water can cause damage to almost all cathode materials, lithium iron phosphate is minor, but for high nickel, lithium is eluted too much, which can result in increased slurry PH and decreased capacity. Third, aqueous systems are difficult to dry and residual moisture can have an impact on capacity recycling. Fourth, the density of the existing anode materials such as lithium cobaltate, ternary materials and the like is large, the mass of substances in unit volume is also large, water is used as a solvent when an SBR + CMC bonding system is adopted, but the deposition of the materials in the slurry is easily caused in the batching process of the anode materials with large density, and no method is provided for fully dispersing the slurry. Once the agitation stopped, the slurry settled down sharply. And PVDF oil-soluble material is used as a binder, and is dissolved by an organic solvent, wherein the organic solvent is N-methyl pyrrolidone (NMP), so that the problems can be effectively solved, the structure of the pole piece is stabilized, and the protection effect on the pole piece is improved.
Further, the binder may be at least one selected from the group consisting of a vinylidene fluoride-hexafluoropropylene copolymer, a polyamide, a polyacrylonitrile, a polyacrylate, a polyacrylic acid, a polyacrylate, a sodium carboxymethylcellulose, a polyvinylpyrrolidone, a polyvinyl ether, a polymethyl methacrylate, a polytetrafluoroethylene, a polyhexafluoropropylene, and a styrene butadiene rubber. In this example, the use of polyacrylonitrile as the binder has the following advantages: 1. swelling hardly occurs in an electrolyte carbonate solvent, and the electrode plate structure is stable in the charging and discharging processes; 2. the carboxyl content in the structure is higher than that of sodium carboxymethyl cellulose, and the structure can form stronger hydrogen bond action with an active substance material containing hydroxyl and other groups on the surface, so that more uniform coating is formed on the surface of an electrode than the sodium carboxymethyl cellulose; 3. a compact film can be formed in the electrode plate, and the electric contact between the active substance and the current collector is increased; 4. excellent tensile mechanical strength and is beneficial to mechanical processing. The polytetrafluoroethylene also has excellent chemical stability, electrical insulation, self-lubricating property, non-combustibility, atmospheric aging resistance and high and low temperature adaptability, and has high mechanical strength, thereby being beneficial to improving the stability of the pole piece structure.
In one embodiment, the first active material, the second active material, the third active material and the fourth active material further include a conductive agent. It can be understood that the normal charge and discharge process of the lithium battery requires the participation of lithium ions and electrons, which requires that the electrodes of the lithium ion battery must be mixed conductors of ions and electrons, and the electrode reaction can only occur at the junctions of the electrolyte, the conductive agent and the active material. Secondly, most of the positive active materials are transition metal oxides or transition metal phosphates, which are semiconductors or insulators and have poor conductivity, and a conductive agent must be added to improve the conductivity. In this embodiment, by adding the conductive agent to the first active material, the second active material, the third active material, and the fourth active material, the conductive contact between the active materials can be increased, and the electron conductivity can be improved, that is, micro-current can be collected between the active materials and the current collector, so as to reduce the contact resistance of the electrodes and accelerate the movement speed of electrons.
Further, the conductive agent is at least one of carbon nanotubes, conductive carbon black, acetylene black, graphene, ketjen black, and carbon fibers. In this embodiment, the conductive agent can form an electronic conduction network cooperating with the active material of the positive plate, so that the electrode active particles can be electrically connected well, and the carbon nanotube conductive agent can be more easily and fully mixed in the above glue solution compared with other conductive agents, thereby reducing the stirring time, improving the gram specific capacity of the positive electrode of the battery, indirectly improving the internal space of the battery core, and improving the energy density of the battery core. The conductive graphite also has better conductivity, the particles of the conductive graphite are closer to the particle size of active substance particles, and the particles are in point contact with each other, so that a conductive network structure with a certain scale can be formed, and the conductive rate is improved, and the capacity of the negative electrode can be improved when the conductive graphite is used for the negative electrode. The conductive carbon fiber has a linear structure, and a good conductive network is easily formed in the electrode to show better conductivity, so that the polarization of the electrode is reduced, the internal resistance of the battery is reduced, and the performance of the battery is improved. In the battery using carbon fiber as the conductive agent, the contact form of the active substance and the conductive agent is point-line contact, and compared with the point-point contact form of conductive carbon black and conductive graphite, the contact form is not only beneficial to improving the conductivity of the electrode, but also capable of reducing the consumption of the conductive agent and improving the capacity of the battery. Graphene is used as a novel conductive agent, and due to the unique sheet structure (two-dimensional structure), the contact with an active substance is in a point-surface contact mode instead of a conventional point contact mode, so that the effects of the conductive agent and the like can be maximized, the using amount of the conductive agent is reduced, the active substance can be used more, and the capacity of a lithium battery is improved.
In one embodiment, the insulating layer includes at least one of inorganic particles and a polymer. It can be understood that, through at blank area coating insulating layer, and the insulating layer respectively with fourth active material layer and first active material layer juncture parallel and level for neither overlapping between first active material layer, fourth active material layer and the insulating layer three, also there is the clearance, so, not only can improve the security performance of battery, can also guarantee that positive pole piece is not excessive pressure, guarantees the electrical property of battery. In order to further improve the insulating effect of the insulating layer and the structural stability of the pole piece, in the present embodiment, the insulating layer includes at least one of inorganic particles and polymers. The inorganic insulating particles have better insulating property, and the inorganic insulating particles are mutually combined to form the inorganic insulating layer, so that the flatness of the insulating layer is improved, and the flatness and the stability of the pole piece structure are further improved.
Further, the inorganic particles are at least one of alumina, silica, magnesia, titania, hafnia, tin oxide, ceria, nickel oxide, zinc oxide, calcium oxide, zirconia, yttria, silicon carbide, boehmite, aluminum hydroxide, magnesium hydroxide, calcium hydroxide, and barium sulfate. In this embodiment, the silicon dioxide has better insulation, the resistivity of the silicon dioxide film grown by thermal oxidation is about 1015-1016 ohm.m, and the silicon dioxide has higher dielectric strength and higher breakdown voltage. The aluminum hydroxide used as the inorganic particles of the insulating layer has a good insulating effect, has good flame retardance, and can achieve a corrosion-resistant effect, so that the safety and stability of the pole piece structure are effectively improved.
In one embodiment, the polymer is at least one of a homopolymer of vinylidene fluoride, a copolymer of hexafluoropropylene, polystyrene, polyphenylacetylene, sodium polyvinyl acetate, potassium polyvinyl acetate, polymethyl methacrylate, polyethylene, polypropylene, and polytetrafluoroethylene. It can be understood that the polymer insulating layer has the advantages of good insulating property, light weight and good rolling flatness, so that the structural stability and flatness of the pole piece structure can be effectively improved. In order to further improve the stability of the polymer insulation layer, in this embodiment, the polymer is at least one of a homopolymer of vinylidene fluoride, a copolymer of hexafluoropropylene, polystyrene, polyphenylacetylene, sodium polyvinyl acetate, potassium polyvinyl acetate, polymethyl methacrylate, polyethylene, polypropylene, and polytetrafluoroethylene. The homopolymer of the vinylidene fluoride has good insulativity and good chemical corrosion resistance, so that the stability of the pole piece structure can be effectively improved.
In one embodiment, the insulating layer is attached to the fourth active material layer and the insulating region, so that the insulating layer covers the edge of the fourth active material layer, which is adjacent to the insulating region, and thus, no exposed gap exists between the edge of the fourth active material layer and the insulating layer, the problem of short circuit caused by needling is avoided, and the safety performance of the lithium battery is improved.
It can be understood that in the subsequent operation of the positive electrode cell structure, the insulating layer is easy to warp due to heating or scratch, so that the firmness of the insulating layer is reduced, the insulating layer has a risk of separation, and the safety performance of the lithium battery is reduced. In one embodiment, the insulating layer is coated or attached to the fourth active material layer and the insulating region, so that the insulating layer covers the edge of the fourth active material layer adjacent to the insulating region, and after the step of obtaining the positive electrode sheet structure, the method for preparing the positive electrode sheet structure further includes: and grooving operation is carried out on the edge of the insulating layer, so that a plurality of anti-falling grooves are formed at intervals on the edge of the insulating layer, and a plurality of anti-falling parts are formed at intervals on the edge of the insulating layer.
In this embodiment, the insulating layer includes insulator and a plurality of anticreep portion, and a plurality of anticreep portion interval are connected in insulator's edge, form the anticreep groove between two adjacent anticreep portions. Because there is the anticreep groove between two adjacent anticreep portions for each anticreep portion can not directly drive other anticreep portions and stick up the limit when sticking up the limit, has avoided the whole condition of sticking up the limit of insulating layer, has improved the firmness of insulating layer, makes the short circuit effect of preventing of insulating layer better.
However, when the rubbing force is large, each anti-falling portion tilts to the edge between two adjacent anti-falling portions, so that each anti-falling portion still drives the insulating layer to tilt integrally, the insulating layer still has a risk of falling off, and the short-circuit prevention function of the insulating layer still has a possibility of failure. In one embodiment, after the step of performing a grooving operation on the edge of the insulating layer to form a plurality of spaced apart separation-preventing grooves on the edge of the insulating layer, and forming a plurality of spaced apart separation-preventing parts on the edge of the insulating layer, the method for preparing the positive electrode plate structure further comprises: trimming each anti-drop part to form a plurality of fracture grooves arranged at intervals. In this embodiment, the insulating layer includes insulator and a plurality of anticreep portion, and a plurality of anticreep portion intervals are connected in insulator's edge, form the anticreep groove between two adjacent anticreep portions, and the rupture groove that a plurality of intervals set up is seted up to each anticreep portion for each anticreep portion reduces with insulator's joint strength. When the rubbing force is large, each anti-off part warps to the fracture groove and is fractured, so that the phenomenon that each anti-off part drives other anti-off parts to warp is avoided, the problem that the edges of the anti-off parts warp integrally when the rubbing force is large is further avoided, the firmness of the insulating layers is improved, and the anti-short circuit effect of the insulating layers is further improved.
It can be understood that after each anti-falling part is broken, the corresponding broken part is scratched and then the insulating layer is still pulled to be integrally tilted, so that the risk of firmness reduction still exists in the insulating layer, and further the risk of failure in short circuit prevention of the insulating layer exists. In one embodiment, in the step of performing the trimming operation on each of the retaining portions so that each of the retaining portions forms a plurality of breaking grooves arranged at intervals, after the trimming operation is completed, the insulating layer forms an embedded portion in the breaking groove. In this embodiment, the insulating layer includes insulator, anticreep portion and inlays the portion of establishing, and the figure of anticreep portion is a plurality of, and a plurality of anticreep portion interval connection are in insulator's edge, form the anticreep groove between two adjacent anticreep portions, and the rupture groove that a plurality of intervals set up is seted up to each anticreep portion, inlays the figure of establishing the portion to be a plurality of, and a plurality of portions of establishing and a plurality of rupture groove one-to-one set up, each portion of establishing that inlays is located corresponding rupture groove and is connected with anticreep portion.
Further, after the step of performing a trimming operation on each of the separation preventing portions to form a plurality of fracture grooves arranged at intervals, the method for manufacturing a positive electrode sheet structure further includes: and the pressing operation is carried out on each embedding part, so that each embedding part is embedded into the fourth active material layer, the position stability of the embedding part is improved, the situation that the fracture part tilts and the whole tilting of the insulating layer is driven is facilitated to be inhibited, the position stability of the insulating layer is improved, and the short circuit prevention effect of the insulating layer is further improved.
It can be understood that because the pressfitting inlays the pressfitting spare of establishing the portion and need occupy the certain space of fourth active material layer when the pressfitting for there is the clearance in each back glue face of establishing the portion and the fourth active material layer of inlaying, and then make each inlay the joint strength who establishes portion and fourth active material layer lower, make the insulating layer still have the risk of whole perk. In one embodiment, after the step of performing a pressing operation on each embedding portion to embed each embedding portion into the fourth active material layer, the method for preparing the positive electrode sheet structure further includes: the gap between each embedded part and the fourth active material layer is filled so as to improve the connection strength between each embedded part and the fourth active material layer.
The back adhesive surface of each embedded part cannot be bonded with the fourth active material layer, so that the connection strength between each embedded part and the fourth active material layer is low. In order to improve the connection strength between each embedded part and the fourth active material layer, further, in the step of filling the gap between each embedded part and the fourth active material layer, glue is filled in the gap between each embedded part and the fourth active material layer, so that two opposite side surfaces of each embedded part are bonded with the fourth active material layer, the problem of the whole tilting of the insulating layer is effectively avoided, and the short-circuit prevention effect of the insulating layer is further ensured.
In one embodiment, after the step of performing a cold pressing operation on the multilayer coated structure to obtain a multilayer compacted structure, and before the step of coating or attaching the insulating layer to the fourth active material layer and the insulating region, so that the insulating layer covers the edge of the fourth active material layer adjacent to the insulating region, to obtain the positive electrode sheet structure, the method for preparing the positive electrode sheet structure further includes the following steps: and spraying inorganic particles on one side of the fourth active material layer, which is away from the current collector, the edge of the first active material layer, which is adjacent to the insulation area, the edge of the fourth active material layer, which is adjacent to the insulation area, and the surface of the insulation area. It can be understood that, since the fourth active material layer and the first active material layer have been preliminarily cured, the insulating layer has a better fluidity and the insulating region has a poor adsorbability, so that the coating or bonding operation of the insulating layer is not easily controlled, and the problem of poor leveling property is easily caused. In order to improve the leveling nature of insulating layer, in this embodiment, to the fourth active substance layer one side that deviates from the current collector, the edge of the adjacent insulating zone in first active substance layer, the edge of the adjacent insulating zone in fourth active substance layer and the surface of insulating zone spout inorganic particle operation, make inorganic particle adhesion in the fourth active substance layer one side that deviates from the current collector, the edge of the adjacent insulating zone in first active substance layer, the edge of the adjacent insulating zone in fourth active substance layer and the surface of insulating zone, thereby strengthen the one side that the fourth active substance layer deviates from the current collector, the edge of the adjacent insulating zone in first active substance layer, the edge of the adjacent insulating zone in fourth active substance layer and the adsorption affinity of insulating zone, make the material of insulating layer change the coating and set, be favorable to improving the leveling nature of insulating layer. In addition, the inorganic particles are the main substances of the insulating layer coating, have better insulativity and better intermiscibility with the insulating layer, so that the contact surface of the insulating layer and the coating multilayer structure can be more compact, and the stability of the structure of the positive pole piece is improved.
The application also provides a positive pole piece structure which is prepared by the preparation method of the positive pole piece structure in any embodiment.
As shown in fig. 2, further, the positive electrode tab structure 20 includes a current collector 210, a first active material layer 220, a second active material layer 230, a third active material layer 240, a fourth active material layer 250, and an insulating layer 260, wherein one side of the current collector 210 is provided with a first coating region 211 and an insulating region 212 which are adjacently disposed, one side of the current collector 210 facing away from the first coating region 211 is provided with a second coating region 213, the first active material layer 220 is connected to the first coating region 211, the second active material layer 230 is connected to the second coating region 213, the third active material layer 240 is connected to one side of the second active material layer 230 facing away from the current collector 210, the fourth active material layer 250 is connected to one side of the first active material layer 220 facing away from the current collector 210, the insulating layer 260 is connected to one side of the insulating region 212 and the fourth active material layer 250 facing away from the current collector 210, so that the insulating layer 120 covers an intersection line of the fourth active material layer 250 and the insulating region 212, that is, such that the edge of the fourth active material layer 250 adjacent to the insulating region 212 is covered by the insulating layer 260. In the present embodiment, the current collector 210 is an aluminum sheet, the first active material layer 220, the second active material layer 230, the third active material layer 240 and the fourth active material layer 250 are used for embedding lithium ions, and the insulating layer 260 can isolate the current collector 210 from the outside to prevent the current collector 210 from short circuit.
In the positive electrode sheet structure 20, since the insulating layer 120 covers the boundary line between the fourth active material layer 250 and the insulating region 212, that is, the edge of the fourth active material layer 250 adjacent to the insulating region 212 is covered by the insulating layer 260, the boundary between the insulating region 212 and the fourth active material layer 250 is covered by the insulating layer 260, thereby avoiding the short circuit problem caused by needle punching and improving the safety performance of the lithium battery. Moreover, the part that insulating layer 260 and fourth active substance layer 250 overlap is located the outside that fourth active substance layer 250 deviates from current collector 210 for insulating layer 260 can be connected after the positive pole piece is colded pressing, and then has avoided insulating layer 260 to lead to the problem of positive pole piece excessive pressure, has improved the performance of lithium cell. Because insulating layer 260 can be connected after the pole piece is colded pressed for the connection quality of insulating layer 260 does not receive the influence of cold pressing operation, and then has improved the connection quality of insulating layer 260, helps improving the short circuit prevention effect of insulating layer 260.
As shown in fig. 2, in one embodiment, the insulating layer 260 is further connected to the edge of the first active material layer 220 adjacent to the insulating region 212, so that the bonding area of the insulating layer 260 is larger, and further, the firmness of the insulating layer 260 is improved, which is helpful for improving the short-circuit prevention effect of the insulating layer 260. Further, the insulating layer 260 is further connected to the edge of the fourth active material layer 250 adjacent to the insulating region 212, so that the bonding area of the insulating layer 260 is larger, the firmness of the insulating layer 260 is higher, and the short-circuit prevention effect of the insulating layer 260 is further improved.
As shown in fig. 2, further, an edge of the first active material layer 220 adjacent to the insulation region 212 is flush with an edge of the fourth active material layer 250 adjacent to the insulation region 212, so that the connection surface of the insulation layer 260 has a high flatness, and thus the number of bending times of the insulation layer 260 is small, and the connection efficiency of the insulation layer 260 is improved. Moreover, since the number of bending times of the insulating layer 260 is small, the resilience of the insulating layer 260 is reduced, and the insulating layer 260 is prevented from being separated from the corresponding connection portion, that is, the firmness of the insulating layer 260 is improved, which is helpful for improving the short circuit prevention effect of the insulating layer 260.
As shown in fig. 2, in one embodiment, the thickness of the portion of the insulating layer 260 located on the insulating region 212 is greater than the thickness of the first active material layer 220, so that the boundary line between the first active material layer 220 and the fourth active material layer 250 is shielded by the insulating layer 260, and the boundary line is prevented from being scratched to the boundary between the first active material layer 220 and the fourth active material layer 250 when the insulating layer 260 is connected, thereby preventing the first active material layer 220 and the fourth active material layer 250 from being scratched from the current collector 210 when the insulating layer 260 is connected, and helping to ensure the usability of the positive electrode sheet structure 20.
As shown in fig. 2, in one embodiment, the periphery of the first active material layer 220 coincides with the periphery of the fourth active material layer 250, that is, the first active material layer 220 completely coincides with the fourth active material layer 250, so that the edge formed by the first active material layer 220 and the fourth active material layer 250 is flat, which helps to prevent the first active material layer 220 and the fourth active material layer 250 from being rubbed off, thereby improving the position stability of the first active material layer 220 and the fourth active material layer 250 and improving the service performance of the lithium battery.
As shown in fig. 2, in one embodiment, the periphery of the second active material layer 230 is overlapped with the periphery of the third active material layer 240, that is, the second active material layer 230 is completely overlapped with the third active material layer 240, so that the edge formed by the second active material layer 230 and the third active material layer 240 is smooth, which helps to prevent the second active material layer 230 and the third active material layer 240 from being rubbed off from the outside, thereby improving the position stability of the second active material layer 230 and the third active material layer 240 and improving the service performance of the lithium battery.
As shown in fig. 2, in one embodiment, the thickness of the first active material layer 220 is the same as that of the second active material layer 230. In this embodiment, in the rolling process, since the thickness of the first active material layer 220 is equal to the thickness of the second active material layer 230, the pressures applied to the two sides of the current collector 210 are the same, and the positive electrode sheet structure 20 has better symmetry, thereby improving the consistency and stability of the positive electrode sheet structure 20.
As shown in fig. 2, in one embodiment, the thickness of the fourth active material layer 250 is the same as that of the third active material layer 240. In this embodiment, in the rolling process, since the thickness of the fourth active material layer 250 is equal to the thickness of the third active material layer 240, the pressures applied to the two sides of the current collector 210 are the same, and the positive electrode sheet structure 20 has better symmetry, so as to improve the consistency and stability of the positive electrode sheet structure 20.
As shown in fig. 3, in one embodiment, the insulating layer 260 includes an insulating body 261 and a plurality of anti-separation portions 262, the plurality of anti-separation portions 262 are connected to an edge of the insulating body 261 at intervals, so that an anti-separation groove 2601 is formed between two adjacent anti-separation portions 262, the insulating body 261 is attached to a side of the fourth active material layer 250, which faces away from the current collector 210, the insulating body 261 is attached to a side of the fourth active material layer 250, which faces away from the insulating region 212, the insulating body 261 is further attached to a side of the first active material layer 220, which faces away from the insulating region 212, the insulating body 261 is further attached to the insulating region 212, and each anti-separation portion 262 is attached to a side of the fourth active material layer 250, which faces away from the current collector 210. In this embodiment, because there is anticreep groove 2601 between two adjacent anticreep portions 262 for each anticreep portion 262 can not directly drive other anticreep portions 262 and stick up the limit when sticking up the limit, has avoided the whole condition of sticking up the limit of insulating layer 260, has improved the firmness of insulating layer 260, makes the short circuit effect of preventing of insulating layer 260 better.
As shown in fig. 3 and fig. 4, further, each anti-disengaging part 262 is provided with a plurality of fracture grooves 2621 arranged at intervals to reduce the connection strength between each anti-disengaging part 261 and the insulator 261, in this embodiment, when the rubbing force is large, because the connection strength between each anti-disengaging part 262 and the insulator 261 is low, each anti-disengaging part 262 tilts to the fracture groove 2621 and fractures, so as to prevent each anti-disengaging part 262 from driving other anti-disengaging parts 262 to warp, thereby avoiding the problem of overall edge warping when the rubbing force is large, which is helpful for improving the firmness of the insulating layer 260, and further improving the short-circuit prevention effect of the insulating layer 260.
As shown in fig. 4 and 5, the insulating layer 260 further includes a plurality of embedded portions 263, the number of the embedded portions 263 is plural, the plurality of embedded portions 263 and the plurality of breaking grooves 2621 are arranged in a one-to-one correspondence, each embedded portion 263 is located in the corresponding breaking groove 2621 and connected to the anti-falling portion 262, and each embedded portion 263 is embedded inside the fourth active material layer 250, so as to improve the position stability of each embedded portion 263, help to suppress the tilting of the breaking portion and to pull the overall tilting of the insulating layer 260, improve the position stability of the insulating layer 260, and further improve the short-circuit prevention effect of the insulating layer 260.
Further, the fourth active material layer 250 is provided with a plurality of embedded grooves, the embedded grooves and the embedded portions 263 are arranged in a one-to-one correspondence, and each embedded portion 263 is located in the corresponding embedded groove and connected with the fourth active material layer 250, so that each embedded portion 263 is embedded in the fourth active material layer 250.
As shown in fig. 2 and fig. 3, in one embodiment, the insulating body 261 includes a first connection portion 2611, a second connection portion 2612 and a third connection portion 2613, the first connection portion 2611 is connected to the insulating region 212, the second connection portion 2612 is connected to the edge of the first active material layer 220 adjacent to the insulating region 212, the second connection portion 2613 is further connected to the edge of the fourth active material layer 250 adjacent to the insulating region 212, and the third connection portion 2613 is connected to a side of the fourth active material layer 250 facing away from the current collector 210. In this embodiment, the third connection portion 2613 is connected to a partial region of the fourth active material layer 250 on the side away from the current collector 210. The second connection portion 2612 is perpendicular to the first connection portion 2611, and the third connection portion 2613 is perpendicular to the second connection portion 2612, so that the insulating body 261 is closely attached to a side of the fourth active material layer 260 facing away from the current collector 210, an edge of the fourth active material layer 260 adjacent to the insulating region 212, an edge of the first active material layer 220 adjacent to the insulating region 212, and the insulating region 212.
Compared with the prior art, the invention has at least the following advantages:
1. because the insulating layer covers the boundary line of the fourth active material layer and the insulating region, namely the edge of the fourth active material layer adjacent to the insulating region is covered by the insulating layer, and no exposed gap exists between the edge of the fourth active material layer and the insulating layer, the problem of short circuit caused by needling is avoided, and the safety performance of the lithium battery is improved.
2. Because the insulating layer coats or laminates in fourth active material layer and insulating area after the cold pressing operation, avoided the insulating layer to lead to the problem of positive pole piece excessive pressure, improved the performance of lithium cell.
3. Because the insulating layer can carry out coating or laminating after the pole piece is colded pressed for the connection quality of insulating layer does not receive the influence of cold pressing operation, and then has improved the connection quality of insulating layer, helps improving the short circuit effect of preventing of insulating layer, and then makes the performance of lithium cell better.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A preparation method of a positive pole piece structure is characterized by comprising the following steps:
coating a first active material on one side of a current collector to obtain a first active material layer;
coating a second active material on one side of the current collector, which is far away from the first active material layer, so as to obtain a second active material layer;
coating a third active material on one side of the second active material layer, which is far away from the current collector, so as to obtain a third active material layer;
coating a fourth active material on one side of the first active material layer, which is far away from the current collector, to obtain a fourth active material layer, and further obtain a multilayer coating structure; wherein an insulating region is reserved on one surface of the current collector, which is adjacent to the fourth active material layer;
carrying out cold pressing operation on the multilayer coating structure to obtain a multilayer compacted structure;
and coating or attaching an insulating layer on the fourth active material layer and the insulating area so that the insulating layer covers the edge of the fourth active material layer adjacent to the insulating area to obtain the positive pole piece structure.
2. The method of claim 1, wherein the first active material, the second active material, the third active material, and the fourth active material are at least one of lithium cobaltate, lithium iron phosphate, lithium manganese iron phosphate, sodium iron phosphate, lithium vanadium phosphate, sodium vanadium phosphate, lithium vanadyl phosphate, sodium vanadyl phosphate, lithium vanadate, lithium manganate, lithium nickelate, lithium nickel manganese manganate, lithium manganese rich-based material, lithium nickel cobalt aluminate, and lithium titanate.
3. The method for preparing the positive electrode plate structure according to claim 2, wherein the first active material, the second active material, the third active material and the fourth active material further comprise a binder.
4. The method for preparing the positive electrode plate structure of claim 3, wherein the adhesive is at least one of polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, polyamide, polyacrylonitrile, polyacrylate, polyacrylic acid, polyacrylate, sodium carboxymethylcellulose, polyvinylpyrrolidone, polyvinyl ether, polymethyl methacrylate, polytetrafluoroethylene, polyhexafluoropropylene and styrene butadiene rubber.
5. The method for preparing the positive electrode plate structure according to claim 2, wherein the first active material, the second active material, the third active material and the fourth active material further comprise a conductive agent.
6. The method for preparing the positive electrode plate structure according to claim 5, wherein the conductive agent is at least one of carbon nanotubes, conductive carbon black, acetylene black, graphene, ketjen black and carbon fibers.
7. The method for manufacturing a positive electrode sheet structure according to claim 1, wherein the insulating layer includes at least one of inorganic particles and polymers.
8. The method for preparing a positive electrode plate structure according to claim 7, wherein the inorganic particles are at least one of aluminum oxide, silicon dioxide, magnesium oxide, titanium oxide, hafnium oxide, tin oxide, cerium oxide, nickel oxide, zinc oxide, calcium oxide, zirconium dioxide, yttrium oxide, silicon carbide, boehmite, aluminum hydroxide, magnesium hydroxide, calcium hydroxide, and barium sulfate.
9. The method for preparing the positive electrode plate structure of claim 7, wherein the polymer is at least one of a homopolymer of vinylidene fluoride, a copolymer of hexafluoropropylene, polystyrene, polyphenylacetylene, sodium polyvinyl acetate, potassium polyvinyl acetate, polymethyl methacrylate, polyethylene, polypropylene, and polytetrafluoroethylene.
10. A positive pole piece structure, which is characterized by being prepared by the preparation method of the positive pole piece structure of any one of claims 1 to 9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115548260A (en) * | 2022-11-29 | 2022-12-30 | 江苏正力新能电池技术有限公司 | Positive pole piece, preparation method thereof and lithium ion battery |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115548260A (en) * | 2022-11-29 | 2022-12-30 | 江苏正力新能电池技术有限公司 | Positive pole piece, preparation method thereof and lithium ion battery |
| CN115548260B (en) * | 2022-11-29 | 2023-02-28 | 江苏正力新能电池技术有限公司 | Positive pole piece, preparation method thereof and lithium ion battery |
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