CN114784289A - Bipolar current collector and preparation method thereof, lithium ion battery and vehicle - Google Patents
Bipolar current collector and preparation method thereof, lithium ion battery and vehicle Download PDFInfo
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- CN114784289A CN114784289A CN202210406436.5A CN202210406436A CN114784289A CN 114784289 A CN114784289 A CN 114784289A CN 202210406436 A CN202210406436 A CN 202210406436A CN 114784289 A CN114784289 A CN 114784289A
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Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/665—Composites
- H01M4/667—Composites in the form of layers, e.g. coatings
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
- H01M2004/029—Bipolar electrodes
Abstract
The invention relates to the technical field of lithium ion batteries, and particularly provides a bipolar current collector for a lithium ion battery, a preparation method of the bipolar current collector, the lithium ion battery and a vehicle, wherein the bipolar current collector comprises: an insulating layer; a positive current collector layer disposed on a first side of the insulating layer; the negative current collecting layer is arranged on the second side of the insulating layer; wherein the positive current collector layer and/or the negative current collector layer is provided with a carrier layer at a side remote from or close to the insulating layer, and the carrier layer is removably provided to the positive current collector layer and/or the negative current collector layer so as to: during the production of the bipolar current collector, the mechanical strength of the positive current collector layer and/or the negative current collector layer attached thereto is increased by the carrier layer. With such a configuration, the energy density of the lithium ion battery is improved on the premise of ensuring that the bipolar current collector has sufficient mechanical strength and current collection capability.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, and particularly provides a bipolar current collector for a lithium ion battery, a preparation method of the bipolar current collector, the lithium ion battery and a vehicle.
Background
A lithium ion battery, which is a kind of secondary battery, mainly operates on the principle that lithium ions move between a positive electrode and a negative electrode of the battery. Specifically, during charging, lithium ions are extracted from the positive electrode and inserted into the negative electrode through the electrolyte, so that the negative electrode is in a lithium-rich state. Accordingly, during discharge, lithium ions are extracted from the negative electrode and inserted into the positive electrode through the electrolyte, so that the positive electrode is in a lithium-rich state. As an energy storage device with high voltage, high energy density and long cycle life, a lithium ion battery is widely applied in the fields of consumer electronics, electric tools, new energy vehicles, energy storage and the like.
The current collector is one of indispensable components in the lithium ion battery and is mainly used for collecting current of positive and negative active materials in the charging and discharging processes. The current collectors widely used in the production of the battery core of the lithium ion battery at present are a positive metal aluminum foil current collector (positive current collecting layer) and a negative metal copper foil current collector (negative current collecting layer). In order to continuously improve the energy density of the lithium ion battery, reduce the weight of the foil, reduce the thickness of the foil and ensure the conductivity/tensile strength/flexibility, there is a continuous effort in the industry.
Accordingly, there is a need in the art for a new solution to the above problems.
Disclosure of Invention
Technical problem
The present invention has been made to solve at least some of the above problems, or at least some of the problems.
Technical scheme
In view of the above, a first aspect of the present invention provides a bipolar current collector for a lithium ion battery, the bipolar current collector comprising: an insulating layer; a positive current collector layer disposed on a first side of the insulating layer; and a negative current collector layer disposed on a second side of the insulating layer; wherein the positive current collector layer and/or the negative current collector layer is provided with a carrier layer at a side remote from or close to the insulating layer, and the carrier layer is removably provided to the positive current collector layer and/or the negative current collector layer so as to: during the production of the bipolar current collector, the mechanical strength of the positive current collector layer and/or the negative current collector layer attached thereto is increased by the carrier layer.
With this configuration, the bipolar current collector can be ensured to have sufficient mechanical strength by the addition of the carrier layer.
In particular, due to the addition of the support layer, the bipolar current collector can have the necessary mechanical strength during the coating, drying, rolling, etc. process (production stage) of the electrode comprising the bipolar current collector, since the support layer is not removed. In this way, the addition of the first and second support layers can reduce the thickness of the positive and negative current collector layers in the bipolar current collector in the stage of use while ensuring sufficient strength, and thus it is expected to improve the energy density of the lithium ion battery.
It is understood that those skilled in the art can determine the material, the number of layers, the thickness, etc. of the support layer according to actual requirements, and whether the support layer is specifically configured to be a positive current collecting layer or a negative current collecting layer, the manner of carrying the positive/negative current collecting layers thereto, the manner of removing the positive/negative current collecting layers from the positive/negative current collecting layers, etc. Illustratively, the support layer corresponding to the positive current collecting layer includes a layer a and a layer B stacked, and the support layer corresponding to the negative current collecting layer includes a layer a. Wherein the thicknesses of the two may be the same or different. For example, the thickness of the two layers a is the same, so that the thickness of the support layer corresponding to the positive current collector layer is greater than the thickness of the support layer corresponding to the negative current collector layer.
For the bipolar current collector for lithium ion batteries described above, in one possible embodiment, the support layer comprises: a first carrier layer removably disposed on the positive current collector layer; and a second carrier layer removably disposed to the negative current collector layer; wherein the first carrier layer and the second carrier layer are the same or different.
By means of this construction, a specific design of the carrier layer is provided.
For the bipolar current collector for lithium ion batteries described above, in one possible embodiment, the thickness of the positive current collector layer is 0.1-10 μm; and/or the thickness of the negative current collecting layer is 0.1-10 μm.
With such a configuration, the degree of quantization of the thickness of the positive/negative current collector layer is given.
Particularly, due to the arrangement of the carrier layer, the thickness of the positive/negative electrode current collecting layer is reduced, and the energy density of the lithium ion battery is expected to be improved on the basis.
For the bipolar current collector for lithium ion batteries described above, in one possible embodiment, the carrier layer is a metal foil layer, a plastic film layer, or a release paper.
By means of such a construction, possible material/structural forms of the carrier layer are given.
Taking the carrier layer as release paper as an example, after the process flow needing the carrier layer is completed, the release paper is removed from the corresponding positive/negative current collecting layer in a stripping mode.
For example, the plastic film layer may include, but is not limited to, PET, PE, OPP, BOPET, BOPP, BOPA, PVC, CPP, nylon, and the like.
For the bipolar current collector for lithium ion batteries described above, in one possible embodiment, the support layer has a thickness of 10-200 μm.
By such a construction, a possible thickness range of the carrier layer is given. Illustratively, the carrier layer is a 150 μm layer of metallic aluminum foil.
In a possible embodiment, the bipolar current collector for a lithium ion battery is attached to the carrier layer by electroplating, electroless plating or magnetron sputtering.
With such a construction, a possible way of attaching the positive/negative current collecting layers to the carrier layer is given.
For the bipolar current collector for lithium ion batteries described above, in one possible embodiment, the thickness of the insulating layer is 0.1-10 μm.
By such a construction, a range of possible thicknesses of the insulating layer is given.
For example, the insulating layer may be a thermosetting adhesive, which may be one or more of polyester, epoxy, polyurethane, polybutadienic acid, silicone, polyester imide, polyimide, or polyacrylic acid.
In a possible embodiment, for the bipolar current collector for a lithium ion battery, the positive current collector layer is an aluminum layer, and the negative current collector layer is a copper layer.
By such a constitution, possible materials of the positive/negative current collecting layers are given.
A second aspect of the present invention provides a method for preparing a bipolar current collector for a lithium ion battery, the bipolar current collector including: an insulating layer; a positive current collector layer disposed on a first side of the insulating layer; and a negative current collector layer disposed on a second side of the insulating layer; wherein the preparation method comprises the following steps: providing a carrier layer and attaching the positive current collecting layer and/or the negative current collecting layer thereon; removing at the support layer from the positive current collecting layer and/or the negative current collecting layer attached thereto so as to: during the production of the bipolar current collector, the mechanical strength of the positive current collector layer and/or the negative current collector layer attached thereto is increased by the carrier layer.
It can be understood that the preparation method of the bipolar current collector for the lithium ion battery has all the technical effects of any one of the bipolar current collectors for the lithium ion battery described in the foregoing, and details are not repeated herein.
With respect to the above-described manufacturing method, in one possible embodiment, the "removing at the support layer from the positive current collecting layer and/or the negative current collecting layer attached thereto" includes: before introducing the insulating layer, the carrier layer is removed from the positive current collecting layer and/or the negative current collecting layer attached thereto.
By such a construction a particular form of correlation between the introduction of the insulating layer and the removal of the carrier layer is given.
With respect to the above-described manufacturing method, in one possible embodiment, the "removing at the support layer from the positive current collecting layer and/or the negative current collecting layer attached thereto" includes: after the introduction of the insulating layer, the carrier layer is removed from the positive current collecting layer and/or the negative current collecting layer attached thereto.
By such a construction, another specific form of correlation between the introduction of the insulating layer and the removal of the carrier layer is given.
For the above manufacturing method, in one possible embodiment, the thickness of the positive electrode current collecting layer is 0.1 to 10 μm; and/or the thickness of the negative current collecting layer is 0.1-10 μm.
By such a constitution, a specific form of the positive/negative electrode current collector layer is given.
A third aspect of the invention provides a lithium ion battery comprising a bipolar current collector for a lithium ion battery according to any one of the preceding claims.
It can be understood that the lithium ion battery has all the technical effects of any one of the foregoing lithium ion batteries, and details are not repeated herein.
A fourth aspect of the invention provides a vehicle equipped with the aforementioned lithium ion battery.
It can be understood that the vehicle has all the technical effects of the lithium ion battery described in any one of the foregoing descriptions, and the details are not repeated here.
an insulating layer;
a positive current collector layer disposed on a first side of the insulating layer; and
a negative current collector layer disposed on a second side of the insulating layer;
wherein the positive current collector layer and/or the negative current collector layer is provided with a carrier layer on a side remote from or close to the insulating layer, and
the carrier layer is removably disposed on the positive current collector layer and/or the negative current collector layer so as to:
during the production of the bipolar current collector, the mechanical strength of the positive current collector layer and/or the negative current collector layer attached thereto is increased by the carrier layer.
Proposal 2. the bipolar current collector for lithium ion batteries according to proposal 1, characterized in that the carrier layer comprises:
a first carrier layer removably disposed on the positive current collector layer; and
a second carrier layer removably disposed on the negative current collector layer;
wherein the first carrier layer and the second carrier layer are the same or different.
Proposal 3 the bipolar current collector for a lithium ion battery according to proposal 1 or 2, characterized in that the thickness of the positive current collector layer is 0.1 to 10 μm; and/or
The thickness of the negative current collecting layer is 0.1-10 μm.
Proposal 4 the bipolar current collector for lithium ion batteries according to proposal 1, characterized in that the carrier layer is a metal foil layer, a plastic film layer or release paper.
Proposal 5. the bipolar current collector for lithium ion batteries according to proposal 4, characterized in that the support layer has a thickness of 10-200 μm.
Proposal 6. the bipolar current collector for lithium ion batteries according to proposal 4, characterized in that the positive current collector layer and/or the negative current collector layer is/are attached to the carrier layer by means of electroplating, electroless plating or magnetron sputtering.
Proposal 7 the bipolar current collector for a lithium ion battery according to proposal 1, characterized in that the thickness of the insulating layer is 0.1 to 10 μm.
The bipolar current collector for a lithium ion battery according to claim 1, wherein the positive current collector layer is an aluminum layer, and the negative current collector layer is a copper layer.
Proposal 9. a method for preparing a bipolar current collector for a lithium ion battery, characterized in that the bipolar current collector comprises:
an insulating layer;
a positive current collector layer disposed on a first side of the insulating layer; and
a negative current collector layer disposed on a second side of the insulating layer;
wherein the preparation method comprises the following steps:
providing a carrier layer and attaching the positive current collecting layer and/or the negative current collecting layer thereon;
removing the carrier layer from the positive current collecting layer and/or the negative current collecting layer attached thereto so as to:
during the production of the bipolar current collector, the mechanical strength of the positive current collector layer and/or the negative current collector layer attached thereto is increased by the carrier layer.
Proposal 10. the production method according to proposal 9, characterized in that the "removing a carrier layer from the positive current collecting layer and/or the negative current collecting layer attached thereto" comprises:
before the introduction of the insulating layer, the carrier layer is removed from the positive current collector layer and/or the negative current collector layer attached thereto.
Proposal 11 the production method according to proposal 9, characterized in that the "removing the carrier layer from the positive electrode current collecting layer and/or the negative electrode current collecting layer attached thereto" includes:
after the introduction of the insulating layer, the carrier layer is removed from the positive current collecting layer and/or the negative current collecting layer attached thereto.
A production method according to any one of claims 9 to 11, characterized in that the thickness of the positive electrode current collecting layer is 0.1 to 10 μm; and/or
The thickness of the negative current collecting layer is 0.1-10 μm.
A lithium ion battery comprising the bipolar current collector for a lithium ion battery of any one of claims 1 to 8.
A vehicle, characterized in that the lithium ion battery of claim 13 is disposed in the vehicle.
Drawings
The invention is described below with reference to the accompanying drawings. In the drawings:
fig. 1 shows a schematic structural view of a bipolar current collector according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a bipolar electrode according to an embodiment of the present invention;
fig. 3 shows a schematic structural diagram of a lithium ion battery according to an embodiment of the invention;
fig. 4 shows a schematic flow diagram of a method of preparing a bipolar current collector according to an embodiment of the invention; and
fig. 5 is a schematic flow chart illustrating a method for manufacturing a bipolar current collector (bipolar electrode) including positive and negative active coatings according to an embodiment of the present invention.
List of reference numerals:
100. a bipolar current collector; 200. a bipolar electrode; 300. a winding core; 1. an insulating layer; 21. a positive current collector layer; 22. a negative current collector layer; 31. a first carrier layer; 32. a second carrier layer; 41. a positive active coating layer; 42. and a negative active coating.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. As described above, in the present invention, the carrier layer is provided on both of the positive current collecting layer and the negative current collecting layer, and the structures of the both layers are substantially the same, and the carrier layer may be provided on only one of the positive current collecting layer and the negative current collecting layer, or the carrier layers may be provided on both of the positive current collecting layer and the negative current collecting layer, but the carrier layers are different from each other.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The singular forms "a", "an" and "the" may include plural forms as well.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present invention, and it will be apparent to one skilled in the art that the present invention may be practiced without some of the specific details. In some instances, the working principle of the lithium ion battery and the specific process of magnetron sputtering, etc. which are well known to those skilled in the art, are not described in detail in order to highlight the gist of the present invention.
Referring to fig. 1 to 3, fig. 1 illustrates a schematic structural view of a bipolar current collector according to an embodiment of the present invention, fig. 2 illustrates a schematic structural view of a bipolar electrode according to an embodiment of the present invention, and fig. 3 illustrates a schematic structural view of a lithium ion battery according to an embodiment of the present invention. As shown in fig. 1 to 3, the bipolar current collector 100 mainly includes an insulating layer 1, a positive current collecting layer 21 disposed on a first side of the insulating layer, and a negative current collecting layer 22 disposed on a second side of the insulating layer. The bipolar electrode 200 can be formed by coating the positive electrode active coating 41 and the negative electrode active coating 42 on the positive electrode current collecting layer and the negative electrode current collecting layer of the bipolar current collector, respectively. Further, by introducing a separator or a structure having the same function as the separator, the winding core 300 serving as a basic winding unit of the lithium ion battery can be formed.
The construction of the bipolar current collector/electrode can be varied both in the production phase and in the finished product phase by adding a positive/negative current collector layer on the first/second carrier layer (31, 32) and then by removably arranging the first/second carrier layer on the positive/negative current collector layer. In particular, at the stage of production of bipolar current collectors/electrodes by coating, drying, rolling, etc., the mechanical strength of the positive/negative current collector layer can be ensured by the clamping of the first/second carrier layer. And in the finished product stage, the thickness of the positive/negative electrode current collecting layer can be reduced through the removal of the first/second carrier layer, so that the energy density of the lithium ion battery containing the positive/negative electrode current collecting layer is improved. Specifically, during the processing of the electrode including the bipolar current collector, the positive/negative current collector layers need to have sufficient strength in the aspects of stretching and the like to ensure that the production process can be smoothly performed, otherwise, the foil of the positive/negative current collector layers is broken, so that the production cannot be smoothly performed. The currently available 6 μm copper foil is taken as an example, which has the tensile strength of 250-300MPa, and the currently available 12 μm aluminum foil is taken as an example, which has the tensile strength of 200-250 MPa. In fact, due to the excellent conductivity of copper/aluminum, a thickness of 1-2 μm can satisfy the basic function of current collector to collect current, and a reduction in thickness means an increase in energy density. However, since the tensile strength of foil decreases with decreasing thickness, thinning of copper/aluminum foil is a significant necessity from the point of view of energy density but presents a great technical challenge from the point of view of mechanical strength.
Based on the bipolar current collector of the present invention, the first/second carrier layer is only removed from the positive/negative current collector layer at a later stage (such as tearing, peeling, etc. as mentioned below). Based on this, the thickness of the positive/negative current collecting layer in the bipolar current collector can be reduced, and the total thickness of the bipolar current collector can be further reduced, so that the energy density of the lithium ion battery can be improved. And, the first/second carrier layer after being removed from the positive/negative current collecting layer also has a possibility of being reused, so the present invention also has a certain advantage of saving material costs.
Taking fig. 1 as an example, in one possible embodiment, the insulating layer 1 mainly includes a main body portion, the main body portion is formed with a first burring along one side (left side in fig. 1) in the width direction of the positive current collecting layer in a direction toward the positive current collecting layer (downward in fig. 1), and the main body portion and the first burring form an arrangement region of the first carrier layer of the positive current collecting layer. The main body portion is formed with a second burring along one side (right side in fig. 1) in the width direction of the negative current collecting layer in a direction toward the negative current collecting layer (upward in fig. 1), and the main body portion and the second burring form an arrangement region of a second carrier layer corresponding to the negative current collecting layer. Through the arrangement of the first/second flanging, the end insulation of the positive/negative electrode current collecting layer is ensured.
In a possible embodiment, the insulating layer 1 is made of a thermosetting insulating glue, for example polyurethane, and has a thickness of 0.1-10 μm. After the thermosetting insulating glue is introduced, the thermosetting insulating glue is subjected to a curing treatment so as to form a stable insulating layer. The curing treatment may be, for example: curing at 150 deg.C for about 30min in the drying tunnel of the curing machine. The material of the positive current collecting layer 21 is aluminum, and the thickness is 0.1-10 μm. The material of the negative current collecting layer 22 is copper, and the thickness is 0.1-10 μm.
In both examples described below, it is assumed for the same example that the first/second carrier layers are substantially identical in material, thickness, manner of introduction and removal of the positive/negative current collector layers thereon and therefrom.
In the embodiment shown in fig. 1, the positive electrode current collector layer 21 is provided with a first carrier layer 31 on the side (lower side) away from the insulating layer, and the first carrier layer 31 is removably provided on the positive electrode current collector layer. The negative collector layer 22 is provided with a second carrier layer 32 on the side (upper side) remote from the insulating layer, the second carrier layer 32 being provided in a removable manner to the negative collector layer.
It can be seen that for this form of bipolar collector, the first/second carrier layer and the insulating layer are on both sides of the positive/negative collector layer, so that no interference occurs between the removal of the first/second carrier layer and the introduction of the insulating layer, and in view of this, a processing can be used: the removal of the first/second carrier layer may be before, simultaneously with or after the addition of the insulating layer.
Referring to fig. 4, fig. 4 shows a schematic flow diagram of a method for manufacturing a bipolar current collector according to an embodiment of the invention, corresponding to the arrangement position of the first/second carrier layers shown in fig. 1. As shown in fig. 4, in a possible embodiment, the method for manufacturing a bipolar current collector comprises the following steps:
s401, provision of first/second carrier layers (introduction of positive/negative current collector layer): a metal foil (e.g., copper foil) layer having a thickness of 10 to 200 μm (e.g., 100 μm) is selected as a base material of the first/second carrier layers corresponding to the positive/negative current collector layers. The metal foil layers are respectively distributed outwards in a belt transmission mode through the unreeling mechanisms corresponding to the positive/negative electrode current collecting layers, and metal aluminum/copper layers with the thickness of about 0.2 mu m are plated on the surface of the base material in a film plating mode such as vacuum plating, namely: and a positive/negative electrode current collecting layer is plated on the first/second carrier layer.
S403, introduction of an insulating layer: an insulating adhesive (such as a flame-retardant thermosetting epoxy resin solid adhesive which can be selected) is coated on the surface of the positive current collecting layer, the coating thickness is about 1 mu m, and the positive current collecting layer (the metal foil layer plated with aluminum) and the negative current collecting layer (the metal foil layer plated with copper) are formed into a composite assembly by means of the insulating adhesive through rolling. And curing the insulating adhesive in the composite assembly, so that the composite assembly forms a stable insulating layer of the bipolar current collector at the position coated with the insulating adhesive.
S405, removing the first/second carrier layer: the two metal foil layers as the first/second carrier layers are peeled off from the surface of the positive/negative current collector layer. And then, cleaning the composite assembly with the first carrier layer/the second carrier layer removed by adopting a cleaning mode such as plasma and the like, thereby obtaining the ultra-thin bipolar current collector with the quality reaching the standard.
It can be seen that in this embodiment first a first/second carrier layer is provided and a positive/negative current collector layer is introduced thereon, then an insulating layer is introduced and finally the first/second carrier layer is torn off.
If the bipolar current collector is prepared, and the side of the positive/negative current collector layer, which is far away from the insulating layer, is coated with the positive/negative active coating, the ultrathin bipolar electrode with the quality reaching the standard can be obtained.
In the embodiment shown in fig. 2, the positive current collector layer 21 is provided with a first carrier layer 31 on one side (upper side) close to the insulating layer, and the first carrier layer 31 is removably provided on the positive current collector layer. The negative current collector layer 22 is provided with a second carrier layer 32 on the side (lower side) close to the insulating layer, the second carrier layer 32 being removably provided to the negative current collector layer.
It can be seen that for this form of bipolar current collector, the first/second carrier layer and the insulating layer are on the same side of the positive/negative current collector layer, so there must be a sequence between the removal of the first/second carrier layer and the introduction of the insulating layer, and since the insulating layer belongs to the functional layer of the finished bipolar current collector, it is necessary to introduce the insulating layer after the removal of the first/second carrier layer. In view of this, the following processing method can be adopted: the first/second carrier layer is removed first and then an insulating layer is added between the positive/negative current collectors. Wherein, the side needing to be coated with the positive/negative active coating and the side where the insulating layer/the first carrier layer/the second carrier layer are located belong to different sides of the positive/negative current collecting layer, so that the positive/negative active coating can be coated on the side of the positive/negative current collecting layer far away from the insulating layer at any time according to actual situations.
In fig. 2, the first/second carrier layer is shown with dashed lines. The meaning to be expressed by the expression: after the first/second carrier layer removing operation is performed on the two composite assemblies respectively composed of the first carrier layer, the positive electrode current collector, the positive electrode active coating layer and the second carrier layer, the negative electrode current collector and the negative electrode active coating layer, the operation of introducing the insulating layer is performed. The first/second carrier layer is thus present in the process of producing the bipolar electrode and not in the product of the bipolar electrode.
Referring to fig. 5, a flow chart of a method for manufacturing a bipolar electrode according to an embodiment of the present invention is shown in fig. 5, which corresponds to the position where the first/second carrier layers are disposed as shown in fig. 2. In one possible embodiment, as shown in fig. 5, the bipolar electrode is prepared by a method comprising the steps of:
s501, introduction of a first/second carrier layer (introduction of a positive/negative current collecting layer), introduction of a positive/negative active coating, specifically: a PET web having a thickness of 10-200 μm (e.g., 100 μm) is selected as the base material for the first/second support layer corresponding to the positive/negative current collector layer. After the surface of the base layer is coated with 0.2-0.6 mu m of release agent, the PET film with the release agent is wound on an unwinding roller of vacuum coating equipment to finish the loading of the base material. And then starting the vacuum coating equipment to unreel the PET film, and performing coating operation on the surface of the PET film close to the side coated with the release agent in a magnetron sputtering mode. The target material for coating is high-purity aluminum wire/copper with the purity of 99.999%, and finally, a metal aluminum/copper film with the thickness of about 2 mu m is deposited on the surface of the PET film close to the side coated with the release agent by controlling the working air pressure, the temperature, the time and other process parameters in a vacuum chamber of the coating equipment, namely: a positive/negative current collector layer is deposited on the first/second carrier layer. Then, a positive/negative active coating is coated on the positive/negative current collecting layer to form a positive/negative electrode assembly including first/second carrier layers corresponding to the positive/negative current collecting layer.
S503, removing the first/second carrier layer, specifically: and stripping off the PET film on the positive/negative electrode assembly to obtain an ultrathin positive current collecting layer (aluminum coating) and an ultrathin negative current collecting layer (copper coating). Such as a peel strength between the positive/negative current collector layer and the first/second support layer of 0.5N/mm or less (e.g., preferably 0.1-0.2N/mm). And then, cleaning the PET film release agent on the aluminum plating layer and the copper plating layer by adopting a cleaning mode such as plasma, and rolling to obtain the positive/negative electrode assembly with the total thickness of about 5 mu m and without the first/second carrier layer.
S505, introducing an insulating layer, specifically: taking a PET (positive electrode assembly without a first carrier layer) deposited with an aluminum film as an introduction base of an insulating layer, the surface of the PET (same side with the first carrier layer) is coated with a layer of flame-retardant thermosetting epoxy resin solid glue as an insulating layer, and the coating thickness is 1 μm. Then, the PET web (negative electrode assembly not including the second carrier layer) on which the copper film was deposited was unwound by an unwinding mechanism, and a surface of the PET web (on the same side as the previous second carrier layer) was brought close to the thermosetting epoxy resin solid glue, thereby bonding between the positive electrode assembly and the negative electrode assembly. For example, the stable insulating layer can be ensured to be obtained by the curing treatment mode after the bonding is finished, so that the ultra-thin bipolar electrode with the qualified quality can be obtained.
It can be seen that in this embodiment, the first/second carrier layer is first provided and the positive/negative current collector layer is introduced thereon, then the first/second carrier layer is peeled off from the positive/negative current collector layer, and finally the insulating layer is introduced. It is clear that the two preparation methods described above are only an illustrative description and are not intended to limit the scope of protection of the present invention. The material, structural form, thickness, etc. of the first/second carrier layer can also be adjusted according to the product form involved, and the equipment adopted for realizing the corresponding steps can be flexibly selected by those skilled in the art. The introduction of the positive/negative electrode current collecting layer can be completed by adopting electroplating, chemical plating vacuum sputtering and other modes according to actual conditions. In addition, the steps can be changed according to actual conditions without violating the core invention point. As for the embodiment corresponding to fig. 2, the introduction of the positive/negative active coating therein may be adjusted to be introduced at the end.
It can be seen that in the bipolar collector of the present invention, since the positive/negative collector layers are respectively added with the first/second carrier layers that can be removed in the production stage, the bipolar collector has sufficient mechanical strength in the production stage where the first/second carrier layers are not removed. Under the precondition, the positive/negative current collecting layer after removing the first/second carrier layer can provide enough capacity for collecting current of the positive/negative active coating in the charge and discharge process in the use stage. The energy density of the lithium ion battery containing the bipolar current collector is expected to be improved due to the fact that the thickness of the positive/negative current collector layer is reduced.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A bipolar current collector for a lithium ion battery, the bipolar current collector comprising:
an insulating layer;
a positive current collector layer disposed on a first side of the insulating layer; and
a negative current collector layer disposed on a second side of the insulating layer;
wherein the positive current collector layer and/or the negative current collector layer is provided with a carrier layer on a side remote from or close to the insulating layer, and
the carrier layer is removably disposed on the positive current collector layer and/or the negative current collector layer so as to:
during the production of the bipolar current collector, the mechanical strength of the positive current collector layer and/or the negative current collector layer attached thereto is increased by the carrier layer.
2. The bipolar current collector for lithium ion batteries according to claim 1, wherein said carrier layer comprises:
a first carrier layer removably disposed on the positive current collector layer; and
a second carrier layer removably disposed on the negative current collector layer;
wherein the first carrier layer and the second carrier layer are the same or different.
3. The bipolar current collector for lithium ion batteries according to claim 1 or 2, wherein the thickness of said positive current collector layer is 0.1-10 μ ι η; and/or
The thickness of the negative current collecting layer is 0.1-10 μm.
4. The bipolar current collector for lithium ion batteries according to claim 1, wherein said carrier layer is a metal foil layer, a plastic film layer or a release paper.
5. The bipolar current collector for lithium ion batteries according to claim 4, wherein said support layer has a thickness comprised between 10 and 200 μm.
6. The bipolar current collector for lithium ion batteries according to claim 4, wherein said positive current collector layer and/or said negative current collector layer are affixed to said carrier layer by means of electroplating, electroless plating or magnetron sputtering.
7. The bipolar current collector for lithium ion batteries according to claim 1, wherein the thickness of the insulating layer is 0.1-10 μ ι η.
8. The bipolar current collector for lithium ion batteries according to claim 1, wherein the positive current collector layer is an aluminum layer and the negative current collector layer is a copper layer.
9. A method of making a bipolar current collector for a lithium ion battery, the bipolar current collector comprising:
an insulating layer;
a positive current collector layer disposed on a first side of the insulating layer; and
a negative current collector layer disposed on a second side of the insulating layer;
wherein the preparation method comprises the following steps:
providing a carrier layer and attaching the positive current collecting layer and/or the negative current collecting layer thereon;
removing the carrier layer from the positive current collecting layer and/or the negative current collecting layer attached thereto so as to:
during the production of the bipolar current collector, the mechanical strength of the positive current collector layer and/or the negative current collector layer attached thereto is increased by the carrier layer.
10. The method according to claim 9, wherein the "removing the support layer from the positive current collecting layer and/or the negative current collecting layer attached thereto" includes:
before the introduction of the insulating layer, the carrier layer is removed from the positive current collector layer and/or the negative current collector layer attached thereto.
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