Preparation method of electrolyte-resistant adhesive tape for lithium battery

Abstract

The invention provides a preparation method of an electrolyte-resistant adhesive tape for a lithium battery, which comprises the following four steps: preparing materials, preparing a paper cup adhesive, preparing a film and forming the adhesive tape. An epoxy resin curing agent, a nitrite accelerant, a hydrogen peroxide catalyst, an ozone catalyst, a magnesium oxide filling agent, a calcium carbonate filling agent, an aluminum oxide filling agent, a polyurethane sealant, a zinc oxide antioxidant, a ferric oxide antioxidant and a nano-silver preservative are added, so that the prepared adhesive has excellent electrolyte resistance; the adhesive tape has the advantages that the adhesive tape can meet the bonding requirement of an electronic product in an electrolyte environment, the adhesive tape is matched with a film, electrolyte permeation can be effectively prevented, the safety and performance of a battery are improved, the film is subjected to surface treatment, the bonding performance of the film and the adhesive is improved, and the stability of the adhesive tape in the using process is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of adhesive tapes, and in particular to a method for preparing an electrolyte-resistant adhesive tape for lithium batteries. Background Art

[0002] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as positive / negative electrode materials and non-aqueous electrolyte solutions. Lithium batteries can be roughly divided into two categories: lithium metal batteries and lithium ion batteries. Lithium ion batteries do not contain metallic lithium and are rechargeable. The fifth generation of rechargeable batteries, lithium metal batteries, was born in 1996. Their safety, specific capacity, self-discharge rate and performance-price ratio are superior to lithium ion batteries. Due to their own high technical requirements, only companies in a few countries are producing such lithium metal batteries.

[0003] At present, lithium batteries need to use sealing materials in the manufacturing process to prevent electrolyte leakage. The main sealing material used in the market is (polypropylene) film. However, the existing film is prone to electrolyte penetration during long-term use, thereby affecting the performance and safety of the battery. Therefore, the present invention proposes a method for preparing a lithium battery electrolyte-resistant tape to solve the problems existing in the prior art. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to propose a method for preparing a lithium battery electrolyte resistant tape. The method for preparing a lithium battery electrolyte resistant tape has the advantage of preparing a tape with electrolyte resistant performance and solves the problems existing in the prior art.

[0005] To achieve the purpose of the present invention, the present invention is implemented by the following technical scheme: a method for preparing a lithium battery electrolyte resistant tape, comprising the following steps:

[0006] Step 1: Prepare materials

[0007] According to the materials required for the electrolyte-resistant tape, corresponding materials are prepared in sequence, and the materials include: film material, vinyl resin, epoxy resin curing agent, nitrite accelerator, magnesium oxide filler, calcium carbonate filler, aluminum oxide filler, zinc oxide antioxidant, iron oxide antioxidant, polyurethane sealant, hydrogen peroxide catalyst, ozone catalyst, nano silver preservative;

[0008] Step 2: Prepare adhesive

[0009] Firstly, vinyl resin is put into a mixing reactor, and the mixing reactor is opened, then epoxy resin curing agent, nitrite accelerator, hydrogen peroxide catalyst and ozone catalyst are added in sequence, and stirred and mixed for the first time, then magnesium oxide filler, calcium carbonate filler, aluminum oxide filler and polyurethane sealant are added, and stirred and mixed for the second time, and finally zinc oxide antioxidant, iron oxide antioxidant and nano silver preservative are added, stirred evenly, and vacuum degassing is performed to obtain an adhesive;

[0010] Step 3: Prepare the film

[0011] Putting polypropylene resin into a casting machine, preparing a film by a casting method, and then treating the surface of the film, and then winding it up for standby use;

[0012] Step 4: Tape Forming

[0013] The adhesive obtained in step 2 is coated on the back of the film in step 3 by using a coating machine, and then the film coated with the adhesive is combined with a release material to form an electrolyte-resistant tape, thereby completing the preparation.

[0014] A further improvement is that in step 1, the ratio of the magnesium oxide filler, the calcium carbonate filler and the aluminum oxide filler is 1:1:1.

[0015] A further improvement is that the ratio between the vinyl resin and the nano silver preservative is 60:1.

[0016] A further improvement is that the film material is one of polyethylene terephthalate or polystyrene.

[0017] A further improvement is that in step 2, the time for the first stirring and mixing and the second stirring and mixing are both 1-2 hours.

[0018] A further improvement is that in step three, the treatment method is one of corona treatment or plasma treatment.

[0019] A further improvement is that the thickness of the film is 0.05 mm-0.1 mm.

[0020] A further improvement is that in step 4, the anti-sticking material is one of release paper or release film.

[0021] A further improvement is that in step 4, the thickness and surface treatment of the anti-sticking material are adapted to the film.

[0022] The beneficial effects of the present invention are as follows: the method for preparing the lithium battery electrolyte-resistant adhesive tape has the following advantages:

[0023] (1) Excellent electrolyte resistance: Due to the use of special films and adhesives, the electrolyte-resistant tape of the present invention has excellent electrolyte resistance, can effectively prevent electrolyte penetration, and improve the safety and performance of the battery.

[0024] (2) Good bonding performance: By surface treating the film, the bonding performance between the film and the adhesive is improved, ensuring the stability of the tape during use.

[0025] (3) Wide applicability: The electrolyte-resistant tape of the present invention can be widely used in the manufacturing process of various types of lithium batteries, and can effectively solve the problem of poor electrolyte resistance of the film in the prior art, improve the safety and performance of the battery, and can also be used in other scenarios where it is necessary to prevent electrolyte leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the steps of the present invention.

[0027] Figure 2 It is a schematic diagram of the structure of the electrolyte resistant adhesive tape of the present invention. DETAILED DESCRIPTION

[0028] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with examples. The examples are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0029] In the following examples, all materials were purchased from commercial sources.

[0030] Embodiment 1

[0031] according to Figure 1-Figure 2 As shown, this embodiment proposes a method for preparing a lithium battery electrolyte resistant tape, comprising the following steps:

[0032] Step 1: Prepare materials

[0033] According to the materials required for the electrolyte-resistant tape, specifically, in this embodiment, the electrolyte-resistant tape is divided into three parts, a film layer, an adhesive layer and a release layer, which correspond to the film, the adhesive and the release paper respectively. Therefore, in the preparation process of the tape, the corresponding materials are prepared in sequence, and the materials include: film material, vinyl resin, epoxy resin curing agent, nitrite accelerator, magnesium oxide filler, calcium carbonate filler, aluminum oxide filler, zinc oxide antioxidant, iron oxide antioxidant, polyurethane sealant, hydrogen peroxide catalyst, ozone catalyst, nano silver preservative;

[0034] Specifically, in this embodiment, the film material is polypropylene resin (OPP) as the main material of the film, and vinyl resin as the resin matrix of the adhesive, which has excellent oxidation resistance, chemical corrosion resistance and mechanical strength, thus providing good adhesion and durability.

[0035] Step 2: Prepare adhesive

[0036] First, put the vinyl resin into the mixing reactor, and start the mixing reactor, then add the epoxy resin curing agent, nitrite accelerator, hydrogen peroxide catalyst and ozone catalyst in sequence, and stir and mix for the first time. The time for the first stirring and mixing is 1 hour. In this embodiment, by adding the epoxy resin curing agent, it can react with the vinyl resin to form a three-dimensional network structure, so that the glue has higher hardness and strength after curing. Then, the hydrogen peroxide catalyst and the ozone catalyst are used to increase the reaction speed between the curing agent and the resin, shorten the curing time of the glue, and improve its curing efficiency. Then, the magnesium oxide filler, the calcium carbonate filler, the oxide filler and the nitrite accelerator are added. Aluminum filler and polyurethane sealant are stirred and mixed for the second time, and the time of the second stirring and mixing is 1 hour. Correspondingly, magnesium oxide filler, calcium carbonate filler and aluminum oxide filler are added to increase the volume of glue and reduce its shrinkage rate, thereby improving its chemical corrosion resistance and mechanical strength. Finally, zinc oxide antioxidant, iron oxide antioxidant and nano silver preservative are added. By adding zinc oxide antioxidant and iron oxide antioxidant, the oxidation resistance of glue is improved, which can effectively inhibit the aging phenomenon of glue in an oxidizing environment and extend its service life. After further stirring evenly, vacuum degassing is performed to obtain electrolyte-resistant glue, that is, the electrolyte-resistant glue is used as an adhesive;

[0037] Step 3: Prepare the film

[0038] Put polypropylene resin into a casting machine and prepare a film by casting method. The thickness of the film is 0.05 mm. The basic principle of the film preparation by casting method is to coat the surface of the substrate in liquid form, solidify it with the help of an external electric field or an external heat source, and collapse it to form a film. Then, the surface of the film is treated by corona treatment. After the treatment, it is rolled up for standby use.

[0039] Step 4: Tape Forming

[0040] Use a coating machine to apply the adhesive obtained in step two to the back of the film in step three, and then combine the film coated with the adhesive with an anti-sticking material, wherein the anti-sticking material is release paper, to form an electrolyte-resistant tape to complete the preparation, and the corresponding thickness and surface treatment of the anti-sticking material are adapted to the film.

[0041] Embodiment 2

[0042] according to Figure 1-Figure 2 As shown, this embodiment proposes a method for preparing a lithium battery electrolyte resistant tape, comprising the following steps:

[0043] Step 1: Prepare materials

[0044] According to the materials required for the electrolyte-resistant tape, specifically, in this embodiment, the electrolyte-resistant tape is divided into three parts, a film layer, an adhesive layer and a release layer, which correspond to the film, the adhesive and the release paper respectively. Therefore, in the preparation process of the tape, the corresponding materials are prepared in sequence, and the materials include: film material, vinyl resin, epoxy resin curing agent, nitrite accelerator, magnesium oxide filler, calcium carbonate filler, aluminum oxide filler, zinc oxide antioxidant, iron oxide antioxidant, polyurethane sealant, hydrogen peroxide catalyst, ozone catalyst, nano silver preservative;

[0045] In this embodiment, the film material is polyethylene terephthalate (PET);

[0046] Step 2: Prepare adhesive

[0047] First, put the vinyl resin into the mixing reactor and start the mixing reactor. Then, add the epoxy resin curing agent, nitrite accelerator, hydrogen peroxide catalyst and ozone catalyst in sequence, and stir and mix for the first time. The time for the first stirring and mixing is 2 hours. In this embodiment, by adding the epoxy resin curing agent, it can react with the vinyl resin to form a three-dimensional network structure, so that the glue has higher hardness and strength after curing. Then, by using the hydrogen peroxide catalyst and the ozone catalyst, the reaction speed between the curing agent and the resin is increased, the curing time of the glue is shortened, and the curing efficiency is improved. Then, the magnesium oxide filler, the calcium carbonate filler, the oxide filler and the nitrite accelerator are added. Aluminum filler and polyurethane sealant are stirred and mixed for the second time, and the time for the second stirring and mixing is 2 hours. Correspondingly, magnesium oxide filler, calcium carbonate filler and aluminum oxide filler are added to increase the volume of glue and reduce its shrinkage rate, thereby improving its chemical corrosion resistance and mechanical strength. Finally, zinc oxide antioxidant, iron oxide antioxidant and nano silver preservative are added. By adding zinc oxide antioxidant and iron oxide antioxidant, the oxidation resistance of glue is improved, which can effectively inhibit the aging phenomenon of glue in an oxidizing environment and extend its service life. After further stirring evenly, vacuum degassing is performed to obtain electrolyte-resistant glue, that is, the electrolyte-resistant glue is used as an adhesive;

[0048] Step 3: Prepare the film

[0049] Put polyethylene terephthalate into a casting machine and prepare a film by a casting method. The thickness of the film is 0.1 mm. The basic principle of the casting method is to coat the surface of the substrate in liquid form, solidify it with the help of an external electric field or an external heat source, and collapse it to form a film. Then, the surface of the film is treated by plasma treatment, and then rolled up for standby use.

[0050] Step 4: Tape Forming

[0051] Using a coating machine, the adhesive obtained in step 2 is coated on the back of the film in step 3, and then the film coated with the adhesive is combined with an anti-sticking material, which is a release film, to form an electrolyte-resistant tape to complete the preparation.

[0052] In combination with Example 1 and Example 2, the present invention uses corona treatment or plasma treatment to treat the surface of the film to improve the bonding performance between the film and the adhesive. The corresponding treatment conditions are adjusted according to the specific film thickness and material properties. At the same time, the release paper or release film needs to be made of a material resistant to electrolyte corrosion, such as polypropylene, polyester, etc., and ensure that the thickness and surface treatment of the release paper or release film match the film to ensure good bonding performance.

[0053] Therefore, the present invention has the following advantages and effects:

[0054] (1) Excellent electrolyte resistance: Due to the use of special films and adhesives, the electrolyte-resistant tape of the present invention has excellent electrolyte resistance, can effectively prevent electrolyte penetration, and improve the safety and performance of the battery.

[0055] (2) Good bonding performance: By surface treating the film, the bonding performance between the film and the adhesive is improved, ensuring the stability of the tape during use.

[0056] (3) Wide applicability: The electrolyte-resistant adhesive tape of the present invention can be widely used in the manufacturing process of various types of lithium batteries, and can also be used in other scenarios where it is necessary to prevent electrolyte leakage.

[0057] Therefore, the present invention is mainly applicable to the lithium battery manufacturing process in the following scope:

[0058] (1) Sealing of battery case and cover;

[0059] (2) Coating of battery tabs and current collectors;

[0060] (3) Insulation protection of internal structural parts of the battery;

[0061] (4) Other scenarios where electrolyte leakage needs to be prevented.

[0062] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for preparing a lithium battery electrolyte-resistant tape, characterized in that: The following steps are involved: Step 1: Prepare materials According to the materials required for the electrolyte-resistant tape, corresponding materials are prepared in sequence, and the materials include: film material, vinyl resin, epoxy resin curing agent, nitrite accelerator, magnesium oxide filler, calcium carbonate filler, aluminum oxide filler, zinc oxide antioxidant, iron oxide antioxidant, polyurethane sealant, hydrogen peroxide catalyst, ozone catalyst, nano silver preservative; Step 2: Prepare adhesive Firstly, vinyl resin is put into a mixing reactor, and the mixing reactor is opened, then epoxy resin curing agent, nitrite accelerator, hydrogen peroxide catalyst and ozone catalyst are added in sequence, and stirred and mixed for the first time, then magnesium oxide filler, calcium carbonate filler, aluminum oxide filler and polyurethane sealant are added, and stirred and mixed for the second time, and finally zinc oxide antioxidant, iron oxide antioxidant and nano silver preservative are added, stirred evenly, and vacuum degassing is performed to obtain an adhesive; Step 3: Prepare the film The film material is placed in a casting machine, and the film is prepared by a casting method, and then the surface of the film is treated, and then the film is rolled up after the treatment for standby use; Step 4: Tape Forming The adhesive obtained in step 2 is coated on the back of the film in step 3 by using a coating machine, and then the film coated with the adhesive is combined with a release material to form an electrolyte-resistant tape, thereby completing the preparation.

2. The method for preparing a lithium battery electrolyte-resistant tape according to claim 1, characterized in that: In the step 1, the ratio of the magnesium oxide filler, the calcium carbonate filler and the aluminum oxide filler is 1:1:

1.

3. The method for preparing a lithium battery electrolyte-resistant tape according to claim 1, characterized in that: The ratio between the vinyl resin and the nano silver preservative is 60:

1.

4. The method for preparing a lithium battery electrolyte-resistant tape according to claim 1, characterized in that: The film material is one of polyethylene terephthalate or polystyrene.

5. The method for preparing a lithium battery electrolyte-resistant tape according to claim 1, characterized in that: In the step 2, the time for the first stirring and mixing and the second stirring and mixing are both 1-2 hours.

6. The method for preparing a lithium battery electrolyte-resistant adhesive tape according to claim 1, characterized in that: In the step three, the treatment method is one of corona treatment or plasma treatment.

7. The method for preparing a lithium battery electrolyte-resistant tape according to claim 1, characterized in that: The thickness of the film is 0.05 mm-0.1 mm.

8. The method for preparing a lithium battery electrolyte-resistant tape according to claim 1, characterized in that: In the step 4, the anti-sticking material is one of release paper or release film.

9. The method for preparing a lithium battery electrolyte-resistant tape according to claim 1, characterized in that: In the step 4, the thickness and surface treatment of the anti-sticking material are adapted to the film.

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