CN113675534A - Environment-friendly high-rate coating diaphragm - Google Patents
Environment-friendly high-rate coating diaphragm Download PDFInfo
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- CN113675534A CN113675534A CN202110973445.8A CN202110973445A CN113675534A CN 113675534 A CN113675534 A CN 113675534A CN 202110973445 A CN202110973445 A CN 202110973445A CN 113675534 A CN113675534 A CN 113675534A
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- coating
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
- H01M50/457—Separators, membranes or diaphragms characterised by the material having a layered structure comprising three or more layers
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
- H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M50/417—Polyolefins
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
- H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M50/423—Polyamide 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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
- H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M50/426—Fluorocarbon polymers
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/44—Fibrous material
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
- H01M50/454—Separators, membranes or diaphragms characterised by the material having a layered structure comprising a non-fibrous layer and a fibrous layer superimposed on one another
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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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Cell Separators (AREA)
Abstract
The invention discloses an environment-friendly high-rate coating diaphragm, which comprises a base film (1), a coating layer (2) and an adhesive layer (3); the PVDF layer (3) is arranged on one side or two sides of the base film (1), the coating layer (2) is coated on the bonding layer (3), and the high-magnification high-temperature-resistant coating layer (4) is coated above the coating layer (2), so that the composite film is formed. The product coating and the base material form an integral structure without obvious layer boundary, the bonding force of an interface is enhanced, the coating and the base material are firmly bonded and are not easy to separate, the battery is prevented from spontaneous combustion through the high-rate high-temperature-resistant coating, and the machining performance of the product and the application safety performance of the battery can be obviously improved.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to an environment-friendly high-rate coating diaphragm.
Background
The rechargeable lithium ion secondary battery has the advantages of high working voltage, high energy density, long cycle life, no memory effect, no pollution, quick charge and discharge and the like, is widely applied to daily electronic, electric and digital products, and has wide market and good development prospect. With the rapid development of power automobiles in recent years, in order to meet the requirements of electric automobiles on high endurance mileage and high charging speed, the pursuit of higher energy density of lithium ion secondary batteries is an important direction of current research, and the following technical problem of how to ensure the safety of lithium batteries is solved;
the diaphragm is one of four key materials of the lithium ion secondary battery, is the key for ensuring the safety performance of the lithium battery, and the quality of the diaphragm has great influence on the capacity of the lithium battery, the service life of the lithium battery and the safety of the lithium battery. Separators as separators for lithium ion secondary batteries must meet certain requirements: firstly, the diaphragm is electrically insulated, and separates the anode and the cathode of the battery, so as to prevent the two electrodes from contacting and short-circuiting; secondly, the diaphragm is made of porous material to meet the lithium ion conduction performance requirement; thirdly, the separator must have good heat resistance, and when the inside of the battery is heated to a certain temperature when the outside generates a very large current due to short circuit or erroneous connection, the separator can still maintain dimensional stability and keep the positive and negative electrodes from contacting. Finally, the separator must have sufficient chemical stability, resist electrolyte corrosion, be wettable by the electrolyte, have sufficient mechanical strength, and the like.
The coating of the coating diaphragm of the existing lithium ion secondary battery diaphragm has an obvious interface with a substrate, the binding force between the coating and the substrate is small, the coating is easy to peel off from the surface of the substrate, the machining performance of a product and the application safety performance of a battery are influenced, the requirement of a high-end market cannot be met, the high temperature resistance of the existing coating diaphragm is poor, the spontaneous combustion reaction of a lithium battery can be caused, and the safety problem exists.
Disclosure of Invention
The invention aims to solve the technical problem of providing an environment-friendly high-rate coating diaphragm, wherein a product coating and a base material form an integral structure without obvious layer boundary, the bonding force of an interface is enhanced, the coating and the base material are firmly bonded and are not easy to separate, the battery is prevented from spontaneous combustion through the high-rate high-temperature-resistant coating, and the machining performance of a product and the application safety performance of the battery can be obviously improved.
The environment-friendly high-rate coating diaphragm is realized by the following technical scheme: comprises a base film, a coating layer and an adhesive layer;
the PVDF layer is arranged on one side or two sides of the base film, the coating layer is coated on the bonding layer, and the high-rate high-temperature-resistant coating is coated above the coating layer, so that the composite film is formed.
As an optimal technical scheme, the coating layer is an aramid fiber coating layer, the aramid fiber coating layer positioned at the bottom layer is adhered to the base film through the adhesive layer, one side of the adhesive layer permeates into the base film, and the other side of the adhesive layer permeates into the aramid fiber coating layer.
As a preferred technical scheme, the number of the coating layers is 1-5.
As a preferable technical scheme, the thickness of the composite film is 10-33 μm.
As a preferred technical scheme, the base membrane is a polyolefin porous base membrane, and the thickness of the polyolefin porous base membrane is 5-25 μm.
As a preferred solution, the coating layer has a thickness of 1 to 5 μm.
The invention has the beneficial effects that: the product coating and the base material form an integral structure without obvious layer boundary, the bonding force of an interface is enhanced, the coating and the base material are firmly bonded and are not easy to separate, the battery is prevented from spontaneous combustion through the high-rate high-temperature-resistant coating, and the machining performance of the product and the application safety performance of the battery can be obviously 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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
In the description of the present invention, it is to be understood that the terms "one end", "the other end", "outside", "upper", "inside", "horizontal", "coaxial", "central", "end", "length", "outer end", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
Further, in the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
The use of terms such as "upper," "above," "lower," "below," and the like in describing relative spatial positions herein is for the purpose of facilitating description to describe one element or feature's relationship to another element or feature as illustrated in the figures. The spatially relative positional terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device may be otherwise oriented and the spatially relative descriptors used herein interpreted accordingly.
In the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "sleeved," "connected," "penetrating," "plugged," and the like are to be construed broadly, e.g., as a fixed connection, a detachable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1, the environment-friendly high-rate coated separator of the present invention comprises a base film 1, a coating layer 2 and an adhesive layer 3;
the PVDF layer 3 is arranged on one side or two sides of the base film 1, the coating layer 2 is coated on the bonding layer 3, and the high-rate high-temperature-resistant coating layer 4 is coated above the coating layer 2, so that the composite film is formed.
In this embodiment, coating 2 is the aramid fiber coating, and the aramid fiber coating that is located the bottom passes through adhesive linkage 3 and bonds on base film 1, and 3 one sides infiltration of adhesive linkage in base film 1, and 3 opposite sides of adhesive linkage permeate in the aramid fiber coating, make the bonding more firm.
In this embodiment, the number of coating layers 2 is 1 to 5.
In this example, the thickness of the composite film was 10 to 33 μm.
In this embodiment, the base film 1 is a polyolefin porous base film having a thickness of 5 to 25 μm.
In this example, the thickness of the coating layer 2 is 1 to 5 μm.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (6)
1. The utility model provides an environment-friendly high magnification coating diaphragm which characterized in that: comprises a base film (1), a coating layer (2) and an adhesive layer (3);
the PVDF layer (3) is arranged on one side or two sides of the base film (1), the coating layer (2) is coated on the bonding layer (3), and the high-magnification high-temperature-resistant coating layer (4) is coated above the coating layer (2), so that the composite film is formed.
2. The environment-friendly high-rate coated separator according to claim 1, wherein: the coating layer (2) is an aramid coating, the aramid coating located at the bottom layer is bonded on the base film (1) through the bonding layer (3), one side of the bonding layer (3) permeates into the base film (1), and the other side of the bonding layer (3) permeates into the aramid coating.
3. The environment-friendly high-rate coated separator according to claim 1, wherein: the number of the coating layers (2) is 1-5.
4. The environment-friendly high-rate coated separator according to claim 1, wherein: the thickness of the composite film is 10-33 μm.
5. The environment-friendly high-rate coated separator according to claim 1, wherein: the base membrane (1) is a polyolefin porous base membrane, and the thickness of the polyolefin porous base membrane is 5-25 mu m.
6. The environment-friendly high-rate coated separator according to claim 1, wherein: the thickness of the coating layer (2) is 1-5 mu m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110973445.8A CN113675534A (en) | 2021-08-23 | 2021-08-23 | Environment-friendly high-rate coating diaphragm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110973445.8A CN113675534A (en) | 2021-08-23 | 2021-08-23 | Environment-friendly high-rate coating diaphragm |
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| Publication Number | Publication Date |
|---|---|
| CN113675534A true CN113675534A (en) | 2021-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110973445.8A Pending CN113675534A (en) | 2021-08-23 | 2021-08-23 | Environment-friendly high-rate coating diaphragm |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114725622A (en) * | 2022-04-14 | 2022-07-08 | 中材锂膜(常德)有限公司 | Separator, method for producing separator, and electrochemical device |
| CN118943665A (en) * | 2024-10-14 | 2024-11-12 | 中国科学院大连化学物理研究所 | A composite diaphragm and its preparation method and application |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105552277A (en) * | 2015-12-22 | 2016-05-04 | 沧州明珠隔膜科技有限公司 | PVDF-coated lithium-ion battery separator and preparation method thereof |
| CN210778776U (en) * | 2019-09-20 | 2020-06-16 | 青岛蓝科途膜材料有限公司 | Composite lithium ion battery diaphragm and lithium ion battery |
-
2021
- 2021-08-23 CN CN202110973445.8A patent/CN113675534A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105552277A (en) * | 2015-12-22 | 2016-05-04 | 沧州明珠隔膜科技有限公司 | PVDF-coated lithium-ion battery separator and preparation method thereof |
| CN210778776U (en) * | 2019-09-20 | 2020-06-16 | 青岛蓝科途膜材料有限公司 | Composite lithium ion battery diaphragm and lithium ion battery |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114725622A (en) * | 2022-04-14 | 2022-07-08 | 中材锂膜(常德)有限公司 | Separator, method for producing separator, and electrochemical device |
| CN118943665A (en) * | 2024-10-14 | 2024-11-12 | 中国科学院大连化学物理研究所 | A composite diaphragm and its preparation method and application |
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Application publication date: 20211119 |