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Two-sided adhesive membrane for lithium ion battery and lithium ion battery

A lithium-ion battery, double-sided adhesive technology, applied to secondary batteries, battery pack components, separators/films/diaphragms/spacer components, etc., can solve battery safety hazards, poor bonding effect, and easy to fall off dust and other problems, to achieve the effect of improving high-rate discharge performance, increasing customer satisfaction, and reducing dust adsorption

Pending Publication Date: 2017-10-20
SHENZHEN RUILONG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first type is that the water-coated PVDF separator has poor bonding effect to the positive electrode, and the positive electrode is easy to drop powder, which is easy to cause short circuit and flatulence, and the lithium-ion battery produced has poor cycle performance and poor high-rate discharge performance.
The second type is the oil-coated PVDF diaphragm. Due to the dip coating method, it can only be coated on both sides, and the static electricity is large, so it is easy to absorb dust during the battery production process. On the one hand, it causes battery safety hazards, and the core is easy to short circuit , and the cycle performance of the battery is not good, on the other hand, the qualified rate is reduced and the manufacturing cost is increased

Method used

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  • Two-sided adhesive membrane for lithium ion battery and lithium ion battery
  • Two-sided adhesive membrane for lithium ion battery and lithium ion battery
  • Two-sided adhesive membrane for lithium ion battery and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] like figure 1 As shown, a double-sided adhesive separator for a lithium ion battery includes a base film 1, one side of the base film 1 is coated with a water-based PVDF adhesive layer 2 to form the A side of the separator, and the other side of the base film 1 is Coated with a polyacrylate adhesive layer 3, forming the B side of the diaphragm. The thickness of the water-based PVDF adhesive layer 2 is 0.5-2 μm, and the thickness of the polyacrylate adhesive layer 3 is 0.5-2 μm.

[0033] Wherein, the active components contained in the adhesive used in the water-based PVDF adhesive layer are PVDF, Al 2 o 3 , the PVDF and Al 2 o 3 The mass ratio is 80:20, and the solvent is water. The adhesive used in the polyacrylate adhesive layer contains an active component of 100% polyacrylate, and a solvent of water. The base film is made of PE.

Embodiment 2

[0035] On the basis of Example 1, the other side of the base film was coated with a polyacrylate adhesive layer to form the B side of the diaphragm. The thickness of the water-based PVDF adhesive layer is 1.0-3.0 μm, and the thickness of the polyacrylate adhesive layer is 1.0-3.0 μm.

[0036] Wherein, the active components contained in the adhesive used in the water-based PVDF adhesive layer are PVDF, Al 2 o 3 , the PVDF and Al 2 o 3 The mass ratio is 40:60, and the solvent is water. The adhesive used in the polyacrylate adhesive layer contains an active component of 100% polyacrylate, and a solvent of water. The base film is made of PE.

Embodiment 3

[0038] On the basis of Example 1, the other side of the base film was coated with a polyacrylate adhesive layer to form the B side of the diaphragm. The thickness of the water-based PVDF adhesive layer is 1.0-3.0 μm, and the thickness of the polyacrylate adhesive layer is 1.0-3.0 μm.

[0039] Wherein, the active components contained in the adhesive used in the water-based PVDF adhesive layer are PVDF, Al 2 o 3 , the PVDF and Al 2 o 3 The mass ratio is 50:50, and the solvent is water. The adhesive used in the polyacrylate adhesive layer contains an active component of 100% polyacrylate, and a solvent of water. The acrylate is ethyl acrylate. The base film is made of PE.

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Abstract

The invention provides a two-sided adhesive membrane for a lithium ion battery and the lithium ion battery. The two-sided adhesive membrane for the lithium ion battery comprises a base membrane, wherein a water-based PVDF adhesion agent layer or a coating layer made of any material including substances capable of being adhered with a binder in a positive mixed material coats one face of the base membrane; a polyacrylate adhesion agent layer coats the other face of the base membrane. By adopting the technical scheme provided by the invention, the short circuit rate of a roll core is reduced, and the product percent of pass is improved; in addition, the hardness of a battery cell is remarkably improved, so that the swelling ratio is greatly reduced; the high-rate discharge property and the cycle performance of the lithium ion battery are improved, the service life is longer, and the lithium ion battery is more reliable.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a double-sided adhesive diaphragm for lithium ion batteries and a lithium ion battery. Background technique [0002] At present, there are two main types of diaphragms with bonding effect on the market: [0003] 1. The solvent is water-based PVDF, which is evenly coated on one or both sides of the base film by gravure printing; [0004] 2. The solvent is oil-based PVDF, which is coated on both sides of the base film by dip coating; [0005] There are some problems with the above-mentioned diaphragms. The first type is that the water-coated PVDF diaphragm has poor adhesion to the positive electrode, and the positive electrode is prone to powder loss, which is easy to cause short circuit and flatulence, and the lithium-ion battery produced has poor cycle performance and poor high-rate discharge performance. The second type is the oil-coated PVDF diaphragm. Due to the dip coa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/0525
CPCH01M10/0525H01M50/409H01M50/449Y02E60/10
Inventor 梁东建杨宽耿建芳阮香良
Owner SHENZHEN RUILONG NEW ENERGY TECH
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