A kind of lithium-ion battery flexible packaging film

A lithium-ion battery and flexible packaging film technology, applied in the field of packaging, can solve problems such as electrolyte leakage, potential safety hazards, and reduce the bonding strength of aluminum foil and heat-sealing layer, so as to prevent deterioration, long service life, and simple and easy preparation method Effect

Active Publication Date: 2018-02-16
乐凯胶片股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the lithium-ion battery is packaged by bonding the heat-sealing layer, water molecules intruding from the end face of the sealing part may enter the interior of the lithium-ion battery. 6 and LiBF 6 The reaction of lithium salt electrolyte can produce strong corrosive HF acid, the existence of HF acid will cause corrosion of the metal surface and reduce the bonding strength of aluminum foil and heat seal layer, which further aggravates the intrusion of water molecules
This vicious cycle will rapidly reduce the performance and service life of the battery, and even cause the infiltration of oxygen and bring safety hazards to the battery
On the other hand, lithium-ion batteries also contain solvents such as propylene carbonate and ethylene carbonate that can dissolve the electrolyte. When these extremely penetrating solvents pass through the heat-sealing layer, they will reduce the adhesion between the aluminum foil and the heat-sealing layer. , resulting in electrolyte leakage hazards

Method used

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  • A kind of lithium-ion battery flexible packaging film
  • A kind of lithium-ion battery flexible packaging film
  • A kind of lithium-ion battery flexible packaging film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1) Prepare a passivation layer of titanium and zirconium salts on a 50 μm thick iron-containing aluminum foil;

[0043] 2) Prepare graphene / siloxane coating solution

[0044] Prepare 970g of acid solution with pH=4.5 with acetic acid and sodium acetate in advance, slowly add 30 grams of siloxane KH550 to the acid solution under stirring conditions, add 0.2 grams of glycerin, stir well, and place it at room temperature for one day;

[0045] Add 1 gram of single-layer pure graphene microflakes with a width of 0.5-1.0 μm, an oxygen content of 0, and an aspect ratio of 500-1000 and 0.5 gram of polyacrylic acid with a molecular weight of 1000 into the siloxane solution, and ultrasonically disperse them evenly , standing still for 3 to 4 hours to obtain a coating solution.

[0046] 3) Preparation of graphene oxide / siloxane physical barrier layer

[0047] The coating solution was evenly coated on the surface of the passivation layer of the aluminum foil by using a gravure co...

Embodiment 2

[0050] 1) Prepare a passivation layer of titanium and zirconium salts on a 45 μm thick iron-containing aluminum foil;

[0051] 2) Prepare graphene / siloxane coating solution

[0052] Prepare 900g of acid solution with pH=3 with carboxysuccinic acid and sodium dodecylbenzenesulfonate in advance, slowly add 90g of siloxane KH550 into the acid solution under stirring condition, add 0.9g of ethanol, stir well, and place at room temperature one day;

[0053] Add 4g of pure graphene microflakes with a width of 2-3μm, an oxygen content of 0 and an aspect ratio of 300-1500 and 1g of polyethylene oxide with a molecular weight of 5000 into the siloxane solution, and ultrasonically disperse them evenly. After standing still for 3 to 4 hours, a coating liquid was obtained.

[0054] 3) Preparation of graphene oxide / siloxane physical barrier layer

[0055] The coating solution was uniformly coated on the surface of the aluminum foil passivation layer by using a gravure coater, and heat-tr...

Embodiment 3

[0058] 1) Prepare a passivation layer of titanium and zirconium salts on a 40 μm thick iron-containing aluminum foil;

[0059] 2) preparing graphene / siloxane coating solution;

[0060] Prepare 950g of acid solution with pH=3.5 with acetic acid and sodium lauryl sulfate in advance, slowly add 50g of siloxane KH560 into the acid solution while stirring, add 0.3g of 1,3-propanediol, stir evenly, and place it at room temperature for one day ;

[0061] Add 2 g of graphene oxide microflakes with a width of 2 to 3 μm, an oxygen content of 40 to 45 wt%, and an aspect ratio of 300 to 1500 and 1.5 g of hydroxypropyl methylcellulose with a molecular weight of 8000 into the siloxane solution , ultrasonically disperse evenly, and stand still for 3 to 4 hours to obtain a coating liquid.

[0062] 3) Preparation of graphene oxide / siloxane physical barrier layer

[0063] The coating solution was evenly coated on the surface of the passivation layer of the aluminum foil by using a gravure co...

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Abstract

The invention relates to a lithium-ion battery flexible packaging film. The packaging film is sequentially provided with a heat-resistant protective layer, a first adhesive layer, an aluminum foil layer, a passivation layer, a second adhesive layer and a thermoplastic resin from outside to inside. A film layer, a physical barrier layer is arranged between the passivation layer and the second adhesive layer, and the physical barrier layer is formed by drying and curing the coating solution containing graphene microchips and siloxane on the surface of the aluminum foil passivation layer wherein, the pH value of the coating solution is 3-5, and the composition and mass percentage are 0.5-2wt% of small molecule organic acid; 2-10wt% of organosiloxane; 0.01-0.1wt% of small molecule alcohol %; graphene microflakes 0.1-1wt%; dispersant 0.05-0.2wt%; the balance is deionized water. The invention can make it difficult for water vapor and oxygen molecules on the outside of the battery to penetrate into the inside of the battery through the physical barrier layer, preventing the deterioration of the battery material, and can also isolate the HF acid in the electrolyte from penetrating into the aluminum foil layer, preventing the HF acid from corroding the aluminum foil. It causes the aluminum foil and the inner membrane to separate, thus having the advantage of long service life.

Description

technical field [0001] The invention relates to the technical field of packaging, in particular to a flexible packaging film for lithium ion batteries. Background technique [0002] At present, the flexible packaging film used for lithium-ion batteries is usually made of a heat-resistant resin protective layer, an adhesive layer, an aluminum foil layer, a passivation layer, an adhesive layer or an adhesive resin layer, and a thermoplastic resin film layer (heat-sealing layer). . However, since the lithium-ion battery is packaged by bonding the heat-sealing layer, water molecules intruding from the end face of the sealing part may enter the interior of the lithium-ion battery. 6 and LiBF 6 The reaction of lithium salt electrolyte can produce strong corrosive HF acid. The existence of HF acid will cause corrosion of the metal surface and reduce the bonding strength of aluminum foil and heat seal layer, which further intensifies the intrusion of water molecules. This vicious...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/02H01M10/0525H01M50/105H01M50/126H01M50/129H01M50/141H01M50/145
CPCH01M10/0525H01M50/116H01M50/124Y02E60/10
Inventor 徐孟进马亚男宋建龙张学建
Owner 乐凯胶片股份有限公司
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