CN113497233B - Lithium ion battery current collector and preparation method and application thereof - Google Patents
Lithium ion battery current collector and preparation method and application thereof Download PDFInfo
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- CN113497233B CN113497233B CN202010256603.3A CN202010256603A CN113497233B CN 113497233 B CN113497233 B CN 113497233B CN 202010256603 A CN202010256603 A CN 202010256603A CN 113497233 B CN113497233 B CN 113497233B
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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
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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
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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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
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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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
- H01M4/663—Selection of materials containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres
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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
- H01M4/668—Composites of electroconductive material and synthetic resins
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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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention provides a lithium ion battery current collector and a preparation method and application thereof. The lithium ion battery current collector comprises a porous current collector matrix and a conductive adhesive layer arranged on the surface of the porous current collector matrix. The lithium ion battery current collector can effectively prevent the active material from falling off, thereby being beneficial to improving the cycle stability of the lithium ion battery; in addition, the lithium ion battery current collector can effectively reduce the quality of the battery current collector, enhance the binding force between the active material and the pole piece and further improve the energy density of the battery.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery current collector and a preparation method and application thereof.
Background
In the traditional lithium ion battery manufacturing industry, copper foil is used for multiple choices of a negative electrode and aluminum foil is used for multiple choices of a positive electrode as a current collector, the current collector usually only has the function of conducting electrons, and the function of the current collector is relatively single. In the negative electrode material of the lithium ion battery, the silicon material has rich resources, and the theoretical specific capacity is up to 4200mAhg -1 It is an ideal negative electrode material of next-generation high-specific energy lithium ion battery. However, the silicon negative electrode material has a large volume change during charge and discharge, so that the negative electrode material is separated from a current collector during the cycle process, thereby limiting the commercial application of the silicon negative electrode material. Meanwhile, the total mass of the positive and negative electrode current collectors made of the traditional foil accounts for about 14% -18% of the total mass of the single battery, and the pursuit of high energy density and light weight of the lithium ion battery cannot be met.
Currently, most solutions to the problem of active material shedding focus on the study of active materials. For example, chinese patent application publication No. CN106025243A discloses a silicon negative electrode composite material for lithium ion battery, which has a double shell layerThe structure is characterized in that a core layer is a composite nano silicon material with a cavity structure, an inner shell layer is a carbon material coating layer, and an outer shell layer is a conductive polymer film; firstly, nano silicon and nano Fe 3 O 4 Mixing the microspheres to carry out carbon coating, then coating a layer of conductive polymer film outside to form a double-shell structure, and coating nano Fe 3 O 4 The microspheres are used as sacrificial templates, and Fe is sacrificed by an acid etching agent 3 O 4 The microsphere enables the core layer to form the composite nano silicon material with a cavity structure, thereby effectively buffering the volume expansion of the nano silicon material.
For another example, chinese patent application with publication number CN208127315U discloses a positive electrode plate of a lithium ion battery and a current collector, where the positive electrode plate of the high-safety lithium ion battery includes a positive current collector and an electrode material layer coated on the positive current collector, the positive current collector includes at least two layers of aluminum foils stacked in parallel at intervals, and a binder layer is disposed between adjacent aluminum foils. On one hand, burrs generated by the aluminum foil with the thin thickness during mechanical damage are small, the membrane is not easy to pierce, and the risk of short circuit is obviously reduced; on the other hand, the binder layer can produce certain cushioning effect to mechanical damage such as extrusion, striking or impaling, and the production volume of burr when reducing the mass flow body and destroying, and then further reduce the risk of battery short circuit. Such a method undoubtedly increases the thickness of the current collector, and cannot meet the modern requirements of light weight of the battery.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a lithium ion battery current collector, a preparation method and application thereof, wherein the lithium ion battery current collector can prevent an active material from falling off, so that the cycle stability of a lithium ion battery is improved; in addition, the lithium ion battery current collector can effectively reduce the quality of the battery current collector, enhance the binding force between the active material and the pole piece and improve the energy density of the battery.
The invention provides a current collector of a lithium ion battery, which comprises a porous current collector matrix and a conductive adhesive layer arranged on the surface of the porous current collector matrix.
Research shows that the volume expansion of active materials such as silicon can be well buffered by the lithium ion battery current collector formed by coating the conductive adhesive layer on the surface of the porous current collector matrix, and then the active materials are prevented from falling off.
In the present invention, it refers to a current collector substrate having a porous structure; the porous current collector substrate is not strictly limited in the present invention, and conventional porous current collectors in the art, such as porous current collector substrate, porous conductive plastic film current collector, porous metal foil current collector, etc., may be used. More specifically, the porous current collector substrate may be prepared by conventional means such as laser drilling, chemical etching, 3D printing, and the like.
In addition, the shape, size, distribution mode, etc. of the pores in the porous current collector matrix are not strictly limited by the present invention. Specifically, a plurality of first holes are distributed on a first surface of the porous current collector matrix, and a plurality of second holes are distributed on a second surface opposite to the first surface; the first hole and the second hole can be oppositely arranged or arranged in a staggered mode, preferably in a staggered mode, and the mode has better structural stability.
In the invention, the conductive adhesive layer is formed by coating a conductive adhesive on the surface of the porous current collector substrate. The conductive adhesive layer mainly plays a role of adhesion to prevent the active material from falling off when the volume of the active material expands; the conductivity of the lithium ion battery is not strictly required, and the requirements on the conductivity of the current collector and the lithium ion battery can be met.
Specifically, in an embodiment, the conductive adhesive may include a conductive agent and an adhesive, and a mass ratio of the conductive agent to the adhesive in the conductive adhesive is (6-10): (1-4). The conductive agent and binder in the conductive binder are not strictly limited in the present invention, and those conventional in the art can be used.
More specifically, the binder is selected from at least one of sodium carboxymethylcellulose, polyvinyl alcohol, polyacrylic acid, carboxymethyl chitosan, polymethacrylic acid, carboxymethyl starch, polyvinylidene fluoride, and polyacrylic acid; the conductive agent is selected from at least one of graphene, carbon black, carbon nanotubes, carbon fibers and conductive graphite.
In another embodiment, the conductive adhesive is formed by in-situ compounding an amphiphilic conductive oligomer and a binder; wherein the amphiphilic conductive oligomer comprises at least one of aniline tetramer, aniline octamer, aniline hexadecamer, pyrrole tetramer, pyrrole octamer, pyrrole hexadecamer, thiophene tetramer, thiophene octamer, thiophene hexadecamer, and their respective derivatives; the derivatives are bromoacetyl substituted oligomers.
The invention also provides a preparation method of the lithium ion battery current collector, which comprises the following steps:
preparing a conductive adhesive;
coating a conductive adhesive on the surface of a porous current collector matrix to obtain a lithium ion battery current collector;
in the invention, the porous current collector substrate can be prepared by conventional methods such as laser drilling, chemical etching, 3D printing and the like.
Specifically, in an embodiment, preparing the conductive adhesive may include:
1) Adding the amphiphilic conductive oligomer and the binder into an acidic medium, and mixing to obtain a mixed solution;
2) And adding an initiator into the mixed solution for in-situ compounding to obtain the conductive adhesive.
Wherein the acidic medium is at least one selected from hydrochloric acid, dodecylsulfonic acid, dodecylbenzenesulfonic acid, camphorsulfonic acid, naphthalenesulfonic acid, and phytic acid; the initiator is selected from at least one of peroxydicarbonates and potassium dichromate; the mass ratio of the amphiphilic conductive oligomer to the binder in the mixed solution is 1; the molar ratio of the amphiphilic conductive oligomer to the acid in the acidic medium in the mixed solution is 1; the molar ratio of the amphiphilic conductive oligomer to the initiator is 10; the temperature of the in-situ compounding is controlled to be 30-60 ℃.
The invention also provides the application of the lithium ion battery current collector in the preparation of the lithium ion battery; the lithium ion battery current collector of the present invention is particularly suitable for active materials that have or undergo volume expansion.
The invention also provides a lithium ion battery, which comprises the lithium ion battery current collector; particularly, the negative electrode current collector of the lithium ion battery is adopted, and the negative electrode material is selected from at least one of silicon, graphite, a carbon material, a tin base, a silicon base and lithium titanate.
Compared with the prior art, the invention has the advantages that at least:
1. the lithium ion battery current collector can obviously improve the energy density of a battery on the premise of effectively reducing the quality of the battery current collector;
2. the lithium ion battery current collector can prevent the active material from falling off, and is particularly suitable for the active material with or capable of generating volume expansion;
3. the lithium ion battery provided by the invention is provided with the lithium ion battery current collector, and when the charge and discharge volume of the battery changes, the conductive adhesive can enhance the adhesive property between the current collector and the active material, so that the cycle performance of a battery monomer is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a current collector of a lithium ion battery according to an embodiment;
fig. 2 is a side SEM image of the negative plate after the pouch cell of example 1 cycled 100 cycles;
fig. 3 is a side SEM image of the negative plate after the pouch cell of comparative example 1 cycled 100 cycles;
fig. 4 is a graph of cell cycle performance for the current collectors of examples 2, 3 and comparative example 1;
FIG. 5 is a graph showing the thickness change rate during charging and discharging in example 4;
FIG. 6 is a graph showing the thickness change rate during charge and discharge of comparative example 1.
Description of the reference numerals:
1: a porous current collector substrate; 11: a first hole; 12: a second hole;
2: a conductive adhesive layer.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like are used in the orientations and positional relationships indicated in the drawings, which are merely for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be 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 in specific cases to those skilled in the art.
Example 1
1. Preparation of porous Current collector substrate
Taking a common copper foil as a base material, and performing laser drilling on two opposite surfaces of the copper foil to obtain a porous current collector matrix 1; as shown in fig. 1, a plurality of first holes 11 are distributed on a first surface of a porous current collector substrate 1, and a plurality of second holes 12 are distributed on a second surface opposite to the first surface, wherein the first holes 11 and the second holes 12 are arranged in a staggered manner.
2. Preparation of conductive adhesive
Adding 10g of N-bromoacetanilide tetramer and 300ml of 7M hydrochloric acid into a three-neck flask, performing ultrasonic treatment for 20min, and uniformly mixing; adding 40g of 30wt% polyvinyl alcohol aqueous solution into a three-neck flask, stirring at 300rpm for 1h, and uniformly stirring; placing the three-neck flask in a heating jacket, and keeping the temperature in the flask at about 30 ℃; 40g of 15% bis (2-ethylhexyl) peroxydicarbonate solution is slowly added into a three-neck flask at a dropping speed of 4 drops/second; and continuously keeping the temperature, stirring and reacting for 20 hours to obtain the polyaniline/polyvinyl alcohol composite conductive adhesive.
3. Preparation of lithium ion battery current collector
And spraying the prepared composite conductive adhesive on the surface of the porous current collector matrix by adopting a conventional spraying method to form a conductive adhesive layer 2 with the thickness of 300nm, thus obtaining the current collector of the lithium ion battery.
4. Preparing soft package battery
The ternary nickel cobalt lithium manganate material is used as a positive electrode material, and the silicon-carbon composite material is used as a negative electrode material.
And coating the positive electrode material on a conventional aluminum foil current collector, and coating the negative electrode material on the prepared lithium ion battery current collector to obtain the 22Ah soft package battery.
Example 2
1. Preparation of porous Current collector substrate
The method comprises the following steps of taking a common copper foil as a base material, carrying out chemical etching on two opposite surfaces of the copper foil to obtain a porous current collector matrix, wherein a plurality of first holes are distributed on the first surface of the porous current collector matrix, a plurality of second holes are distributed on the second surface opposite to the first surface, and the first holes and the second holes are arranged oppositely.
2. Preparation of conductive adhesive
Mixing graphene, carbon black SP and sodium alginate according to a mass ratio of 1:1:8, mixing to prepare the conductive adhesive.
3. Preparation of lithium ion battery current collector
And spraying the prepared composite conductive adhesive on the surface of the porous current collector matrix by adopting a conventional spraying method to form a conductive adhesive layer with the thickness of 500nm, thus obtaining the current collector of the lithium ion battery.
4. Preparation of Soft Package Battery
The ternary nickel cobalt lithium manganate material is used as a positive electrode material, and the silicon carbon negative electrode material is used as a negative electrode material.
And coating the positive electrode material on a conventional aluminum foil current collector, and coating the negative electrode material on the prepared lithium ion battery current collector to obtain the 22Ah soft package battery.
Example 3
1. Preparation of porous Current collector substrate
The method comprises the following steps of taking a common copper foil as a base material, carrying out chemical etching on two opposite surfaces of the base material to obtain a porous current collector matrix, wherein a plurality of first holes are distributed on the first surface of the porous current collector matrix, and a plurality of second holes are distributed on the second surface opposite to the first surface, wherein the first holes and the second holes are oppositely arranged.
2. Preparation of conductive adhesive
Mixing carbon black SP and carboxymethyl cellulose CMC in a mass ratio of 1:9, mixing to prepare the conductive adhesive.
3. Preparation of lithium ion battery current collector
And spraying the prepared composite conductive adhesive on the surface of the porous current collector matrix by adopting a conventional spraying method to form a conductive adhesive layer with the thickness of 600nm, thus obtaining the current collector of the lithium ion battery.
4. Preparing soft package battery
The ternary lithium nickel cobalt manganese oxide material is used as a positive electrode material, and graphite is used as a negative electrode material.
And coating the positive electrode material on a conventional aluminum foil current collector, and coating the negative electrode material on the prepared lithium ion battery current collector to obtain the 22Ah soft package battery.
Example 4
1. Preparation of porous Current collector substrate
The porous current collector substrate is prepared by adopting 3D printing, a plurality of first holes are distributed on the first surface of the porous current collector substrate, a plurality of second holes are distributed on the second surface opposite to the first surface, and the first holes and the second holes are arranged in a staggered mode.
3. Preparation of conductive adhesive
Mixing graphene, carbon black SP and sodium alginate according to a mass ratio of 1:2:7, mixing to prepare the conductive adhesive.
3. Preparation of lithium ion battery current collector
And spraying the prepared composite conductive adhesive on the surface of the porous current collector matrix by adopting a conventional spraying method to form a conductive adhesive layer with the thickness of 700nm, thus obtaining the current collector of the lithium ion battery.
4. Preparing soft package battery
The ternary lithium nickel cobalt manganese oxide material is used as a positive electrode material, and graphite is used as a negative electrode material.
And coating the positive electrode material on a conventional aluminum foil current collector, and coating the negative electrode material on the prepared lithium ion battery current collector to obtain the 22Ah soft package battery.
Comparative example 1
The ternary nickel cobalt lithium manganate material is used as a positive electrode material, and the silicon-carbon composite material is used as a negative electrode material.
And coating the positive electrode material on a conventional aluminum foil current collector, and coating the negative electrode material on a conventional copper foil current collector to obtain the 22Ah soft package battery.
Comparative example 2
The ternary nickel cobalt lithium manganate material is used as a positive electrode material, and the silicon-carbon composite material is used as a negative electrode material.
Coating a positive electrode material on a conventional aluminum foil current collector, and coating a negative electrode material on the porous current collector matrix in the embodiment 1 to obtain a 22Ah soft package battery; that is, the same as example 1 except that the conductive adhesive was not coated.
Comparative example 3
The ternary nickel cobalt lithium manganate material is used as a positive electrode material, and the silicon-carbon composite material is used as a negative electrode material.
Mixing the graphene, the carbon black SP and the sodium alginate in the embodiment 2 with a negative electrode material in the same amount, and coating the mixture on the porous current collector matrix in the embodiment 2 in the same manner to obtain a 22Ah soft package battery; that is, the same as example 2 except that the conductive binder was mixed with the negative electrode material and then coated at the same time.
Test examples
The pouch batteries prepared in examples 1 to 4 and comparative examples 1 to 3 were subjected to charge and discharge cycle tests, and the results are shown in fig. 2 to 6.
Fig. 2 is a cross-sectional SEM image of the negative electrode sheet after the pouch cell of example 1 was cycled 100 times, and fig. 3 is a cross-sectional SEM image of the negative electrode sheet after the pouch cell of comparative example 1 was cycled 100 times. The results show that: the lithium ion battery current collector prepared by the embodiment of the invention has the advantages that the cracks between the active material and the current collector are obviously reduced, and the lithium ion battery current collector can buffer the volume expansion of the active material, so that the falling of the active material is prevented.
Fig. 4 is a graph of cell cycling performance for examples 2, 3 and comparative example 1. The results show that: the lithium ion battery current collector prepared by the embodiment of the invention has better cycle performance.
Fig. 5 is a thickness change rate curve during charge and discharge of example 4, and fig. 6 is a thickness change rate curve during charge and discharge of comparative example 1. The results show that: the thickness change of the battery using the current collector is smaller than that of the traditional current collector in the charging and discharging processes, and the thickness change of the battery cell in the charging and discharging processes can be reduced by using the current collector.
The soft-package batteries prepared in examples 1 to 4 and the soft-package batteries of comparative examples 1 to 3 were weighed, respectively, and the soft-package batteries were subjected to charge and discharge tests and, at the same time, to a pole piece peel strength test, with the test results shown in table 1.
Table 1 soft-package battery cell weight and cell energy density test results
As can be seen from table 1, the weight of the battery using the current collector of the present invention is significantly reduced, the mass energy density of the battery cell is improved, and the peel strength of the electrode plate is significantly enhanced.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The lithium ion battery current collector is characterized by comprising a porous current collector matrix and a conductive adhesive layer arranged on the surface of the porous current collector matrix; the porous current collector comprises a porous current collector substrate, a plurality of first holes and a plurality of second holes, wherein the first holes are distributed on a first surface of the porous current collector substrate, the second holes are distributed on a second surface opposite to the first surface, and the first holes and the second holes are oppositely arranged or staggered; the conductive adhesive layer is formed by coating a conductive adhesive on the surface of the porous current collector substrate, the conductive adhesive is formed by compounding an amphiphilic conductive oligomer and the adhesive in situ, and the amphiphilic conductive oligomer comprises at least one of aniline tetramer, aniline octamer, aniline hexadecamer, pyrrole tetramer, pyrrole octamer, pyrrole hexadecamer, thiophene tetramer, thiophene octamer, thiophene hexadecamer and derivatives of the above substances.
2. The lithium ion battery current collector of claim 1, wherein the porous current collector matrix is selected from at least one of a porous conductive plastic film current collector and a porous metal foil current collector.
3. The lithium ion battery current collector of claim 1, wherein the derivative is a bromoacetyl substituted oligomer.
4. The lithium ion battery current collector of claim 1, wherein the conductive adhesive layer has a thickness of 200nm to 1 μ ι η.
5. The method for preparing a lithium ion battery current collector of any one of claims 1 to 4, comprising the steps of:
preparing a conductive adhesive;
coating a conductive adhesive on the surface of a porous current collector matrix to obtain a lithium ion battery current collector;
the preparation of the conductive adhesive comprises:
1) Adding the amphiphilic conductive oligomer and the binder into an acidic medium, and mixing to obtain a mixed solution;
2) And adding an initiator into the mixed solution for in-situ compounding to obtain the conductive adhesive.
6. The method according to claim 5, wherein the porous current collector substrate is prepared by laser drilling, chemical etching or 3D printing.
7. The method according to claim 5, wherein the acidic medium is at least one selected from the group consisting of hydrochloric acid, dodecylsulfonic acid, dodecylbenzenesulfonic acid, camphorsulfonic acid, naphthalenesulfonic acid, and phytic acid;
the initiator is selected from at least one of peroxydicarbonates and potassium dichromate;
the mass ratio of the amphiphilic conductive oligomer to the binder in the mixed solution is 1-20;
the molar ratio of the amphiphilic conductive oligomer in the mixed solution to the acid in the acidic medium is 1; the molar ratio of the amphiphilic conductive oligomer to the initiator is 10;
controlling the temperature of the in-situ compounding to be 30-60 ℃.
8. Use of the lithium ion battery current collector of any of claims 1 to 4 in the preparation of a lithium ion battery.
9. A lithium ion battery comprising the lithium ion battery current collector of any of claims 1-4.
10. The lithium ion battery of claim 9, wherein the lithium ion battery current collector is used as a negative electrode current collector of the lithium ion battery, and the negative electrode material is selected from at least one of a carbon material, a tin-based material, a silicon-based material, and lithium titanate.
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| CN109888295A (en) * | 2019-02-28 | 2019-06-14 | 合肥国轩高科动力能源有限公司 | A kind of affluxion body in lithium ion batteries coating paste, collector and preparation method thereof |
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