CN112652775A - Microporous current collector electrode structure and preparation method thereof - Google Patents

Microporous current collector electrode structure and preparation method thereof Download PDF

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Publication number
CN112652775A
CN112652775A CN202011615987.XA CN202011615987A CN112652775A CN 112652775 A CN112652775 A CN 112652775A CN 202011615987 A CN202011615987 A CN 202011615987A CN 112652775 A CN112652775 A CN 112652775A
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China
Prior art keywords
current collector
microporous
electrode structure
tab
coating
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CN202011615987.XA
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Chinese (zh)
Inventor
何东
刘云峰
吴骐
张伟
王洋洋
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Zhongchuan Zhonggong Huanggan Water Equipment Power Co ltd
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Zhongchuan Zhonggong Huanggan Water Equipment Power Co ltd
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Priority to CN202011615987.XA priority Critical patent/CN112652775A/en
Publication of CN112652775A publication Critical patent/CN112652775A/en
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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
    • H01M4/70—Carriers or collectors characterised by shape or form
    • H01M4/80—Porous plates, e.g. sintered carriers
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Cell Electrode Carriers And Collectors (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

The invention provides a microporous current collector electrode structure, comprising: the current collector comprises a current collector body and an external coating, wherein a plurality of micropore groups are formed in the current collector body, and the external coating is filled in the micropore groups and covers the outer surface of the current collector body. The invention also provides a preparation method of the microporous current collector electrode structure, which comprises the following steps: s1, etching the current collector to form a plurality of micropores; and S2, covering the front surface and the back surface of the current collector with an external coating. The current collector is provided with the plurality of micropores, so that the weight and the volume of the current collector are reduced, the mass ratio energy and the volume ratio energy of the electrode are favorably provided, on the other hand, the positive side and the negative side of the current collector are communicated, the adsorption force of the material and the current collector is improved, meanwhile, the consistency of the performance of the material on the positive side and the negative side is ensured, and the performance of the battery is improved.

Description

Microporous current collector electrode structure and preparation method thereof
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a microporous current collector electrode structure and a preparation method thereof.
Background
With the progress of society, energy problems increasingly become key factors restricting economic development. The lithium ion battery has the advantages of high energy density, long cycle life, environmental friendliness and the like; the power supply not only has been widely used as the power supply of portable electronic equipment such as mobile phones, notebook computers, digital cameras and video cameras, but also has good application prospect in the fields of electric tools, electric mopeds, electric automobiles and the like.
The electrode is the core component of the battery and mainly consists of an active material and a current collector. The conventional electrode at present is formed by covering materials on the surface of a plane metal foil, and has the adverse phenomena of inconsistent contact between the materials on the front side and the back side of a current collector and the current collector, complete isolation and independence of the materials on the front side and the back side, easy separation of the current collector and the like, so that the service life of the electrode is shortened.
Disclosure of Invention
The invention provides a microporous current collector electrode structure and a preparation method thereof, and aims to solve the technical problem that positive and negative coating layers on a current collector are completely isolated and independent in the prior art.
The scheme for solving the technical problems is as follows:
a microporous current collector electrode structure, comprising:
the current collector comprises a current collector body and an external coating, wherein a plurality of micropore groups are formed in the current collector body, and the external coating is filled in the micropore groups and covers the outer surface of the current collector body.
Furthermore, the micropore group comprises 4 micropores, and circle center connecting lines of adjacent micropores form a square.
Furthermore, each micropore group comprises 3 micropores, and the circle centers of adjacent micropores are connected to form a triangle.
Further, still include utmost point ear, utmost point ear with the mass flow body is connected, utmost point ear can be full utmost point ear, unipolar ear, many utmost point ears or antipodal ear.
Further, the material of utmost point ear can be copper or aluminium or nickel or steel, the material of mass flow body with utmost point ear is the same.
A method for preparing a microporous current collector electrode structure, comprising the steps of:
s1, etching the current collector to form a plurality of micropores;
and S2, covering the front surface and the back surface of the current collector with an external coating.
Further, step S1 is specifically: and etching the surface of the current collector by using 12W ultraviolet light or a 100W mopa laser.
Further, step S2 includes:
s21, preparing an outer coating, and executing the steps when the outer coating is in a powdery form;
s22; when the overcoat layer is in the bulk form, go to step S23;
s22, coating the powdery outer coating on the front and back surfaces of the current collector, and rolling to form an electrode;
and S23, directly pressing the block-shaped external coating on the front surface and the back surface of the current collector to form the electrode.
Further, step S2 includes:
s21, preparing an outer coating, and executing the steps when the outer coating is in a powdery form;
s22; when the overcoat layer is in the bulk form, go to step S23;
s22, preparing the powdery outer coating into a solid membrane form, and then pressing the solid membrane form on the front surface and the back surface of the current collector to form electrodes;
and S23, directly pressing the block-shaped external coating on the front surface and the back surface of the current collector to form the electrode.
The current collector is provided with the plurality of micropores, so that the weight and the volume of the current collector are reduced, the mass ratio energy and the volume ratio energy of the electrode are favorably provided, on the other hand, the positive side and the negative side of the current collector are communicated, the adsorption force of the material and the current collector is improved, meanwhile, the consistency of the performance of the material on the positive side and the negative side is ensured, and the performance of the battery is improved.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a schematic structural view of a microporous current collector electrode structure provided by the present invention;
fig. 2 is a schematic cross-sectional view of a microporous current collector electrode structure provided by the present invention;
FIG. 3 is a schematic diagram of two arrangements of microwell groups;
fig. 4 is a discharge test chart of a battery using the electrode structure of the present invention and a battery using a conventional electrode structure.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention. The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
As shown in fig. 1 and 2, a microporous current collector electrode structure according to a first embodiment of the present invention includes: utmost point ear 1, the mass flow body 2 and external coating 3, utmost point ear 1 with the mass flow body 2 is connected, a plurality of micropore groups 4 have been seted up on the mass flow body 2, external coating 3 fills micropore group 4 covers 2 surfaces of the mass flow body.
The structure of the invention reduces the weight and the volume of the current collector, is beneficial to providing the mass ratio energy and the volume ratio energy of the electrode, and enables the coatings on the front and the back of the current collector to be communicated, so that the front and the back of the current collector are integrated, the adsorption force of the coating and the current collector is improved, and the consistency of the performances of the coatings on the front and the back of the current collector is ensured. The electrode structure finally enables the manufactured battery to improve the specific energy, and simultaneously effectively prolongs the cycle life of the battery and the consistency of the battery.
In this embodiment, the tab 1 has multiple specifications, including a full tab, a single tab, multiple tabs, a pair of tabs, etc., and the material thereof may be copper or aluminum or nickel or steel, and the thickness range of the tab 1 is 5 um-20 um.
In this embodiment, the current collector 2 may be made of copper, aluminum, nickel, or steel.
In this embodiment, the outer coating layer 3 has two forms of powder and block, and the main component thereof can be a mixture of transition metal oxide such as manganese dioxide, binder and conductive agent; or a mixture of lithium iron phosphate, lithium cobaltate, lithium nickel cobalt manganese oxide, lithium titanate and the like, a binder and a conductive agent; or a mixture of a carbon material and a binder; and may also be a metallic lithium material.
As shown in fig. 3, in the present embodiment, the microwell group 4 has two arrangements: square arrangement and triangular arrangement.
When the micro-hole groups 4 are arranged in a square shape, each micro-hole group 4 comprises 4 micro-holes 41, and the circle centers of the adjacent micro-holes 41 are connected to form a square shape.
When the micro-hole groups 4 are arranged in a triangle, each micro-hole group 4 comprises 3 micro-holes 41, and the circle centers of the adjacent micro-holes 41 are connected to form a triangle.
On the current collector 2 with the same area, the number of the micropores 41 arranged in a triangular shape is less than that of the micropores 41 arranged in a square shape. Therefore, the integration of the front and back surfaces of the current collectors 2 arranged in a triangular manner is weaker than that of the current collectors 2 arranged in a square manner; however, since the number of the micropores 41 is relatively small, the overall strength of the current collector 2 in the triangular arrangement is stronger than that of the current collector 2 in the square arrangement.
The diameter of the micropores 41 is 3um to 50 um.
The invention also provides a preparation method of the microporous current collector electrode structure, which comprises the following steps:
s1, etching the current collector to form a plurality of micropores;
and S2, covering the front surface and the back surface of the current collector with an external coating.
Step S1 specifically includes: and etching the surface of the current collector by using 12W ultraviolet light or a 100W mopa laser.
In the present embodiment, step S2 includes:
s21, preparing an outer coating, and executing the step S22 when the outer coating is in a powder form; when the overcoat layer is in the bulk form, go to step S23;
s22, coating the powdery outer coating on the front and back surfaces of the current collector, and rolling to form an electrode;
and S23, directly pressing the block-shaped external coating on the front surface and the back surface of the current collector to form the electrode.
In another embodiment, step S2 includes:
s21, preparing an outer coating, and executing the step S22 when the outer coating is in a powder form; when the overcoat layer is in the bulk form, go to step S23;
s22, preparing the powdery outer coating into a solid membrane form, and then pressing the solid membrane form on the front surface and the back surface of the current collector to form electrodes;
and S23, directly pressing the block-shaped external coating on the front surface and the back surface of the current collector to form the electrode.
The discharge test was conducted on the battery using the electrode structure of the present invention and the battery using the conventional electrode structure, and the discharge curve thereof was as shown in fig. 4.
From fig. 4, it can be clearly seen that the battery cell employing the electrode structure of the present invention has significantly better performance than the battery cell employing the conventional electrode structure.
The current collector is provided with the plurality of micropores, so that the weight and the volume of the current collector are reduced, the mass ratio energy and the volume ratio energy of the electrode are favorably provided, on the other hand, the positive side and the negative side of the current collector are communicated, the adsorption force of the material and the current collector is improved, meanwhile, the consistency of the performance of the material on the positive side and the negative side is ensured, and the performance of the battery is improved.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; the present invention may be readily implemented by those of ordinary skill in the art as illustrated in the accompanying drawings and described above; however, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the scope of the invention as defined by the appended claims; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.

Claims (9)

1. A microporous current collector electrode structure, comprising: the current collector comprises a current collector body and an external coating, wherein a plurality of micropore groups are formed in the current collector body, and the external coating is filled in the micropore groups and covers the outer surface of the current collector body.
2. The microporous current collector electrode structure of claim 1, wherein the microporous group comprises 4 micropores, and a line connecting centers of adjacent micropores forms a square.
3. The microporous current collector electrode structure of claim 1, wherein each of the microporous groups comprises 3 micropores, and a line connecting centers of adjacent micropores forms a triangle.
4. The microporous current collector electrode structure of claim 1, further comprising a tab, wherein the tab is connected to the current collector and may be a full tab, a single tab, a multi-tab or a counter tab.
5. The microporous current collector electrode structure of claim 1, wherein the tab is made of copper, aluminum, nickel or steel, and the current collector is made of the same material as the tab.
6. A preparation method of a microporous current collector electrode structure is characterized by comprising the following steps:
s1, etching the current collector to form a plurality of micropores;
and S2, covering the front surface and the back surface of the current collector with an external coating.
7. The method for preparing a microporous current collector electrode structure according to claim 6, wherein the step S1 is specifically: and etching the surface of the current collector by using 12W ultraviolet light or a 100W mopa laser.
8. The method of claim 6, wherein the step S2 comprises:
s21, preparing an outer coating, and executing the steps when the outer coating is in a powdery form;
s22; when the overcoat layer is in the bulk form, go to step S23;
s22, coating the powdery outer coating on the front and back surfaces of the current collector, and rolling to form an electrode;
and S23, directly pressing the block-shaped external coating on the front surface and the back surface of the current collector to form the electrode.
9. The method of claim 6, wherein the step S2 comprises:
s21, preparing an outer coating, and executing the steps when the outer coating is in a powdery form;
s22; when the overcoat layer is in the bulk form, go to step S23;
s22, preparing the powdery outer coating into a solid membrane form, and then pressing the solid membrane form on the front surface and the back surface of the current collector to form electrodes;
and S23, directly pressing the block-shaped external coating on the front surface and the back surface of the current collector to form the electrode.
CN202011615987.XA 2020-12-30 2020-12-30 Microporous current collector electrode structure and preparation method thereof Pending CN112652775A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011615987.XA CN112652775A (en) 2020-12-30 2020-12-30 Microporous current collector electrode structure and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011615987.XA CN112652775A (en) 2020-12-30 2020-12-30 Microporous current collector electrode structure and preparation method thereof

Publications (1)

Publication Number Publication Date
CN112652775A true CN112652775A (en) 2021-04-13

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Country Status (1)

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CN (1) CN112652775A (en)

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