CN107946523B - Base film layer structure for lithium ion battery and preparation method - Google Patents
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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
- H01M50/463—Separators, membranes or diaphragms characterised by their shape
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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
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
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- H—ELECTRICITY
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- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a base film layer structure for a lithium ion battery and a preparation method thereof, wherein the base film layer structure comprises a base film A film and a base film B film; the preparation method comprises the following steps: preparing a base film A film, a base film B film and a base film layer structure; the invention improves the microcosmic and objective distribution uniformity and consistency of the active carbon and the conductive carbon in the electrode, improves the strength of the electrode film and reduces the internal resistance of the electrode, has scientific and reasonable structure, can remove static electricity in the lithium ion battery through the antistatic particles, prevents interference, improves the conductivity of lithium ions through the gel polymer electrolyte, can resist high temperature through the PP film layer and the PE film layer, avoids swelling of a base film layer in the battery and leakage of electrolyte caused by overhigh internal temperature, can achieve the bonding effect through the resin film, and can bond the insulating strip and the gel polymer electrolyte together, and the preparation method is scientific, reasonable, simple and efficient.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a base film layer structure for a lithium ion battery and a preparation method thereof.
Background
A lithium ion battery is a secondary battery (rechargeable battery) that mainly operates by movement of lithium ions between a positive electrode and a negative electrode. During the charge and discharge process, Li + is inserted and extracted back and forth between the two electrodes, during the charge, Li + is extracted from the positive electrode and inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state, and during the discharge, the opposite is true. The battery generally adopts a material containing lithium element as an electrode, and is a representative of modern high-performance batteries. Lithium batteries are classified into lithium batteries and lithium ion batteries. Lithium ion batteries are used in mobile phones and notebook computers, and are commonly called as lithium batteries, but real lithium batteries are rarely applied to daily electronic products due to high danger. Along with the rapid development of the electronic industry at present, the requirements of people on batteries are also continuously improved, but the conventional lithium ion battery is lack of a high-temperature-resistant built-in PP film layer and a built-in PE film layer inside, so that the batteries are often swelled and damaged due to overhigh internal temperature of the batteries, and the conventional lithium ion battery on the market generally adopts a copper foil as a motor inside, so that the cost of the copper foil is high, the manufacturing cost is increased, the popularization of the lithium battery is limited, and a flame-retardant component is lacked, so that the lithium ion battery is often used as a medium of fire due to high temperature.
Therefore, how to design a base film layer structure for a lithium ion battery and a preparation method thereof becomes a problem to be solved currently.
Disclosure of Invention
The invention provides a base film layer structure for a lithium ion battery and a preparation method thereof, which improve the microcosmic and objective distribution uniformity and consistency of active carbon and conductive carbon in an electrode, improve the strength of an electrode film and reduce the internal resistance of the electrode, have scientific and reasonable structure, can remove static electricity in the lithium ion battery and prevent interference through antistatic particles, improve the conductivity of lithium ions through gel polymer electrolyte, resist high temperature through a PP film layer and a PE film layer, avoid the swelling of the base film layer in the battery and the leakage of electrolyte caused by overhigh internal temperature, simultaneously enhance the permeability of internal air holes and the tensile strength between the film layers, are safe and convenient to use, can filter impurities in the electrolyte through a microporous film, improve the storage of electric quantity and prevent the insufficiency of the electric quantity, can achieve the adhesion effect through the resin film, and can enable an insulating strip and the gel polymer electrolyte to be adhered together, the preparation method is scientific, reasonable, simple and efficient, and can effectively solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a lithium ion battery is with basic membrane layer structure, basic membrane layer structure includes base film A membrane and base film B membrane, base film A membrane is by norbornene copolymer, PC, EVA and pack or norbornene copolymer, POE, EVA and pack or norbornene copolymer, PP, EVA and pack or norbornene copolymer and PET's eutectic structures's single-layer structure, base film B membrane includes basic unit, shock attenuation diaphragm bubble, weaving membrane, microporous membrane, antistatic particle, roll extrusion membrane, resin film, non-woven membrane, aluminum hull rete, PP rete and PE rete, the upper portion of basic unit is provided with the shock attenuation diaphragm bubble, shock attenuation diaphragm bubble bottom is provided with weaving membrane bottom end installs the microporous membrane, the inside embedding of microporous membrane has antistatic particle, microporous membrane bottom installs roll extrusion membrane, and roll extrusion membrane bottom and install the resin film, the non-woven membrane is installed to the resin film bottom, the bottom of non-woven membrane is provided with the aluminum hull rete, the bottom of aluminum hull rete is provided with the PP rete, the bottom of PP rete is provided with the PE rete.
A preparation method of a base film layer structure for a lithium ion battery comprises the following steps:
1) preparing a base film A film: the film preparation method comprises the following steps of firstly, uniformly dry-mixing norbornene copolymer, PC, EVA and filler or norbornene copolymer, POE, EVA and filler or eutectic of norbornene copolymer, PP, EVA and filler or norbornene copolymer and PET in a high-speed mixer to prepare a coating, and then uniformly coating the coating on a collector electrode which is subjected to surface treatment and is used in a lithium ion battery to obtain a film of a base film A;
2) preparing a base film B film: firstly, preparing a base layer, uniformly dry-mixing activated carbon, graphite and adhesive powder in a high-speed mixer for 5-50min, heating a three-roll plasticator to 350 ℃ at 100 ℃, slowly adding the materials into the three-roll plasticator for plastication for about 10-120min, and preparing a composite B film with the thickness of 50-500 mu m and the length of 10-2000; the weight percentages of the activated carbon, the graphite and the adhesive are as follows: 40-99 parts of activated carbon, 2-50 parts of graphite and 2-25 parts of adhesive, wherein the total weight is 100; the surface area of the activated carbon is more than 500m2(ii) activated carbon per gram, said graphite is KS6 or AB-065M, said binder is a thermoplastic that can be extruded into a film, an ethylene-tetrafluoroethylene copolymer; then preparing a woven membrane, a microporous membrane, a rolled membrane, a resin membrane, a non-woven membrane, an aluminum shell membrane layer, a PP membrane layer and a PE membrane layer in sequence, and then carrying out hot press molding on the base layer, the woven membrane, the microporous membrane, the rolled membrane, the resin membrane, the non-woven membrane, the aluminum shell membrane layer, the PP membrane layer and the PE membrane layer through a hot press machine to obtain a base membrane B;
3) preparing a base film layer structure: the step of compounding the base film A and the base film B to prepare the electrode base film is to press the prepared base film A and the base film B into a base film structure by a rolling machine at the temperature of 100-400 ℃ and the linear pressure of 80-120T.
According to the technical scheme, the insulating strip is arranged inside the resin film, and the gel polymer electrolyte is arranged outside the insulating strip.
According to the above technical solution, the resin film includes: hollow silica particles having an average particle diameter of more than 20 nm and 100 nm or less, solid silica particles having an average particle diameter of 20 nm or less, a photopolymerizable fluoropolymer, and a thermally polymerizable fluoropolymer.
According to the above technical solution, the method for preparing a resin film comprises preparing a coating solution for a resin film, the coating solution comprising a binder monomer, hollow silica particles having an average particle diameter of more than 20 nm and less than or equal to 100 nm, solid silica particles having an average particle diameter of 20 nm or less than 20 nm, a photo-polymerizable fluoropolymer, and a thermally polymerizable fluoropolymer; applying the coating solution to a substrate to form a coating layer; forming a protective layer by bleeding the photo-polymerizable fluoropolymer and the thermally-polymerizable fluoropolymer to the surface of the coating.
According to the technical scheme, the coating machine in the step 1) is a gravure anilox coating head, and the coating weight is 2-10g/m2The coating thickness is 4-12 μm, the coating machine speed is 1-80m/min, the resistance value of the base film A film is less than 50m omega/square, the coating is double-sided coating, the double-sided alignment precision is +/-0.5 mm, and the coating has no impurities, white spots, wrinkles, curling and bubbles.
According to the technical scheme, the preparation environments of the step 1), the step 2) and the step 3) are all closed dust-free environments.
Compared with the prior art, the invention has the beneficial effects that: the micro and objective distribution uniformity and consistency of the active carbon and the conductive carbon in the electrode are improved, the strength of an electrode film is improved, the internal resistance of the electrode is reduced, the structure is scientific and reasonable, static electricity in the lithium ion battery can be removed through the antistatic particles, interference is prevented, the conductivity of lithium ions is improved through the gel polymer electrolyte, high temperature can be resisted through the PP film layer and the PE film layer, swelling of a base film layer in the battery and leakage of electrolyte caused by overhigh internal temperature are avoided, the permeability of internal air holes and the tensile strength between the film layers are enhanced, the use is safe and convenient, impurities in the electrolyte can be filtered through the microporous film, the electric quantity storage is improved, the electric quantity is prevented from being insufficient, the adhesive effect can be achieved through the resin film, the insulating strip and the gel polymer electrolyte can be adhered together, and the preparation method is scientific and reasonable, is simple and efficient.
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 specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
In the drawings:
FIG. 1 is a flow chart of the preparation of the present invention;
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Example 1: as shown in fig. 1, the present invention provides a base film layer structure for a lithium ion battery, the base film layer structure includes a base film a and a base film B, the base film a is a single-layer structure composed of norbornene copolymer, PC, EVA and filler or norbornene copolymer, POE, EVA and filler or norbornene copolymer, PP, EVA and filler or eutectic of norbornene copolymer and PET, the base film B includes a base layer, a shock-absorbing diaphragm bubble, a woven film, a microporous film, antistatic particles, a rolled film, a resin film, a non-woven film, an aluminum shell film, a PP film and a PE film, the shock-absorbing diaphragm bubble is disposed on the upper portion of the base layer, the woven film is disposed at the bottom end of the shock-absorbing diaphragm bubble, the microporous film is mounted at the bottom end of the woven film, the antistatic particles are embedded in the microporous film, the rolled film is mounted at the bottom end of the microporous film, and the resin film is mounted at the bottom end of the rolled film, the bottom end of the resin film is provided with a non-woven film, the bottom end of the non-woven film is provided with an aluminum shell film layer, the bottom end of the aluminum shell film layer is provided with a PP film layer, and the bottom end of the PP film layer is provided with a PE film layer.
A preparation method of a base film layer structure for a lithium ion battery comprises the following steps:
1) preparing a base film A film: the film preparation method comprises the following steps of firstly, uniformly dry-mixing norbornene copolymer, PC, EVA and filler or norbornene copolymer, POE, EVA and filler or eutectic of norbornene copolymer, PP, EVA and filler or norbornene copolymer and PET in a high-speed mixer to prepare a coating, and then uniformly coating the coating on a collector electrode which is subjected to surface treatment and is used in a lithium ion battery to obtain a film of a base film A;
2) preparing a base film B film: firstly, preparing a base layer, uniformly dry-mixing activated carbon, graphite and adhesive powder in a high-speed mixer for 5-50min, heating a three-roll plasticator to 350 ℃ at 100 ℃, slowly adding the materials into the three-roll plasticator for plastication for about 10-120min, and preparing a composite B film with the thickness of 50-500 mu m and the length of 10-2000; the weight percentages of the activated carbon, the graphite and the adhesive are as follows: 40-99 parts of activated carbon, 2-50 parts of graphite and 2-25 parts of adhesive, wherein the total weight is 100; the surface area of the activated carbon is more than 500m2(ii) activated carbon per gram, said graphite is KS6 or AB-065M, said binder is a thermoplastic that can be extruded into a film, an ethylene-tetrafluoroethylene copolymer; then preparing a woven membrane, a microporous membrane, a rolled membrane, a resin membrane, a non-woven membrane, an aluminum shell membrane layer, a PP membrane layer and a PE membrane layer in sequence, and then carrying out hot press molding on the base layer, the woven membrane, the microporous membrane, the rolled membrane, the resin membrane, the non-woven membrane, the aluminum shell membrane layer, the PP membrane layer and the PE membrane layer through a hot press machine to obtain a base membrane B;
3) preparing a base film layer structure: the step of compounding the base film A and the base film B to prepare the electrode base film is to press the prepared base film A and the base film B into a base film structure by a rolling machine at the temperature of 100-400 ℃ and the linear pressure of 80-120T.
According to the technical scheme, the insulating strip is arranged inside the resin film, and the gel polymer electrolyte is arranged outside the insulating strip.
According to the above technical solution, the resin film includes: hollow silica particles having an average particle diameter of more than 20 nm and 100 nm or less, solid silica particles having an average particle diameter of 20 nm or less, a photopolymerizable fluoropolymer, and a thermally polymerizable fluoropolymer.
According to the above technical solution, the method for preparing a resin film comprises preparing a coating solution for a resin film, the coating solution comprising a binder monomer, hollow silica particles having an average particle diameter of more than 20 nm and less than or equal to 100 nm, solid silica particles having an average particle diameter of 20 nm or less than 20 nm, a photo-polymerizable fluoropolymer, and a thermally polymerizable fluoropolymer; applying the coating solution to a substrate to form a coating layer; forming a protective layer by bleeding the photo-polymerizable fluoropolymer and the thermally-polymerizable fluoropolymer to the surface of the coating.
According to the technical scheme, the coating machine in the step 1) is a gravure anilox coating head, and the coating weight is 2-10g/m2The coating thickness is 4-12 μm, the coating machine speed is 1-80m/min, the resistance value of the base film A film is less than 50m omega/square, the coating is double-sided coating, the double-sided alignment precision is +/-0.5 mm, and the coating has no impurities, white spots, wrinkles, curling and bubbles.
According to the technical scheme, the preparation environments of the step 1), the step 2) and the step 3) are all closed dust-free environments.
Based on the above, the invention has the advantages of improving the microcosmic and objective distribution uniformity and consistency of the activated carbon and the conductive carbon in the electrode, improving the strength of the electrode film and reducing the internal resistance of the electrode, having scientific and reasonable structure, removing the static electricity in the lithium ion battery through the antistatic particles, preventing interference, improving the conductivity of lithium ions through the gel polymer electrolyte, resisting high temperature through the PP film layer and the PE film layer, avoiding the swelling of the base film layer in the battery and the leakage of electrolyte due to overhigh internal temperature, simultaneously enhancing the internal air hole permeability and the tensile strength between the film layers, having safe and convenient use, filtering impurities in the electrolyte through the microporous film, improving the electric quantity storage, preventing the electric quantity from being insufficient, achieving the adhesion effect through the resin film, and bonding the insulating strip and the gel polymer electrolyte together, and the preparation method is scientific, reasonable, simple and efficient.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described above, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A kind of lithium ion battery uses the structure of the basic membrane layer, characterized by that: the base film layer structure comprises a base film layer A and a base film layer B, the base film layer A is of a single-layer structure consisting of norbornene copolymer, PC, EVA, filler or norbornene copolymer, POE, EVA, filler or norbornene copolymer, PP, EVA, filler or norbornene copolymer and PET eutectic, the base film layer B comprises a base layer, a damping diaphragm bubble, a woven film, a microporous film, antistatic particles, a rolling film, a resin film, a non-woven film, an aluminum shell film layer, a PP film layer and a PE film layer, the damping diaphragm bubble is arranged on the upper portion of the base layer, the weaving film is arranged at the bottom end of the damping diaphragm bubble, the microporous film is arranged at the bottom end of the woven film, the antistatic particles are embedded in the microporous film, the rolling film is arranged at the bottom end of the microporous film, the resin film is arranged at the bottom end of the rolling film, the non-woven film is arranged at the bottom end of the non-woven film, the aluminum shell film layer is arranged at the bottom end of the non-woven film, the bottom of aluminium hull rete is provided with the PP rete, the bottom of PP rete is provided with the PE rete.
2. The base film layer structure for a lithium ion battery according to claim 1, characterized in that: the resin film is internally provided with an insulating strip, and the outer side of the insulating strip is provided with gel polymer electrolyte.
3. The base film layer structure for a lithium ion battery according to claim 1, characterized in that: the resin film includes: hollow silica particles having an average particle diameter of more than 20 nm and 100 nm or less, solid silica particles having an average particle diameter of 20 nm or less, a photopolymerizable fluoropolymer, and a thermally polymerizable fluoropolymer.
4. The base film layer structure for a lithium ion battery according to claim 1, characterized in that: the method for preparing the resin film includes preparing a coating solution for the resin film, the coating solution including a binder monomer, hollow silica particles having an average particle diameter of more than 20 nm and less than or equal to 100 nm, solid silica particles having an average particle diameter of 20 nm or less than 20 nm, a photopolymerizable fluoropolymer, and a thermally polymerizable fluoropolymer; applying the coating solution to a substrate to form a coating layer; forming a protective layer by bleeding the photo-polymerizable fluoropolymer and the thermally-polymerizable fluoropolymer to the surface of the coating.
5. A preparation method of a base film layer structure for a lithium ion battery is characterized by comprising the following steps: the method comprises the following steps:
1) preparing a base film A film: the film preparation method comprises the following steps of firstly, uniformly dry-mixing norbornene copolymer, PC, EVA and filler or norbornene copolymer, POE, EVA and filler or eutectic of norbornene copolymer, PP, EVA and filler or norbornene copolymer and PET in a high-speed mixer to prepare a coating, and then uniformly coating the coating on a collector electrode which is subjected to surface treatment and is used in a lithium ion battery to obtain a film of a base film A;
2) preparing a base film B film: firstly, preparing a base layer, uniformly dry-mixing activated carbon, graphite and adhesive powder in a high-speed mixer for 5-50min, heating a three-roll plasticator to 350 ℃ at 100 ℃, slowly adding the materials into the three-roll plasticator for plastication for about 10-120min, and preparing a composite B film with the thickness of 50-500 mu m and the length of 10-2000; the weight percentages of the activated carbon, the graphite and the adhesive are as follows: 40-99 parts of activated carbon, 2-50 parts of graphite and 2-25 parts of adhesive, wherein the total weight is 100; the surface area of the activated carbon is more than 500m2In terms of/gActivated carbon, said graphite is KS6 or AB-065M, said binder is a thermoplastic that can be extruded into a film, an ethylene-tetrafluoroethylene copolymer; then preparing a woven membrane, a microporous membrane, a rolled membrane, a resin membrane, a non-woven membrane, an aluminum shell membrane layer, a PP membrane layer and a PE membrane layer in sequence, and then carrying out hot press molding on the base layer, the woven membrane, the microporous membrane, the rolled membrane, the resin membrane, the non-woven membrane, the aluminum shell membrane layer, the PP membrane layer and the PE membrane layer through a hot press machine to obtain a base membrane B;
3) preparing a base film layer structure: the step of compounding the base film A and the base film B to prepare the electrode base film is to press the prepared base film A and the base film B into a base film structure by a rolling machine at the temperature of 100-400 ℃ and the linear pressure of 80-120T.
6. The method for preparing the base film layer structure for the lithium ion battery according to claim 2, wherein the method comprises the following steps: the coating machine in the step 1) is a gravure anilox coating head, and the coating weight is 2-10g/m2The coating thickness is 4-12 μm, the coating machine speed is 1-80m/min, the resistance value of the base film A film is less than 50m omega/square, the coating is double-sided coating, the double-sided alignment precision is +/-0.5 mm, and the coating has no impurities, white spots, wrinkles, curling and bubbles.
7. The method for preparing the base film layer structure for the lithium ion battery according to claim 2, wherein the method comprises the following steps: the preparation environments of the step 1), the step 2) and the step 3) are all closed dust-free environments.
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| CN118040074B (en) * | 2024-04-11 | 2024-07-19 | 蜂巢能源科技股份有限公司 | Semi-solid lithium ion battery and preparation method thereof |
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| CN1512607A (en) * | 2002-12-26 | 2004-07-14 | �ն��繤��ʽ���� | Porous film, battery partition containing said film and non-aqueous electrolytic battery using said partition |
| CN102640329A (en) * | 2009-09-30 | 2012-08-15 | 日本瑞翁株式会社 | Porous membrane for secondary battery, and secondary battery |
| CN105355815A (en) * | 2015-12-14 | 2016-02-24 | 苏州锂盾储能材料技术有限公司 | Preparation method of lithium ion battery high-heat-resistance and high-infiltration diaphragm |
| US20170263908A1 (en) * | 2016-03-08 | 2017-09-14 | Giner, Inc. | Separator For Use in Electrochemical Cells and Method of Fabrication Thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1512607A (en) * | 2002-12-26 | 2004-07-14 | �ն��繤��ʽ���� | Porous film, battery partition containing said film and non-aqueous electrolytic battery using said partition |
| CN102640329A (en) * | 2009-09-30 | 2012-08-15 | 日本瑞翁株式会社 | Porous membrane for secondary battery, and secondary battery |
| CN105355815A (en) * | 2015-12-14 | 2016-02-24 | 苏州锂盾储能材料技术有限公司 | Preparation method of lithium ion battery high-heat-resistance and high-infiltration diaphragm |
| US20170263908A1 (en) * | 2016-03-08 | 2017-09-14 | Giner, Inc. | Separator For Use in Electrochemical Cells and Method of Fabrication Thereof |
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