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A lithium battery inner layer composite film with super corrosion resistance and preparation method thereof

A corrosion-resistant, composite film technology, used in lithium batteries, battery pack parts, battery boxes/jackets, etc., can solve problems such as high heat sealing strength and high insulation, and achieve high heat sealing strength, excellent electrical insulation, and excellent electrical insulation. The effect of mechanical properties

Active Publication Date: 2022-04-26
JIESHOU CITY TIANHONG PACKAGING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide a lithium battery inner layer composite film with super corrosion resistance and its preparation method, to solve the above background and propose to realize the inner layer of the power lithium battery soft packaging film to be puncture-resistant, electrolyte-resistant, high barrier, high insulation , The problem of high heat seal strength

Method used

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  • A lithium battery inner layer composite film with super corrosion resistance and preparation method thereof
  • A lithium battery inner layer composite film with super corrosion resistance and preparation method thereof
  • A lithium battery inner layer composite film with super corrosion resistance and preparation method thereof

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Embodiment 1

[0045] see Figure 1-3 As shown, a lithium battery inner layer composite film with super corrosion resistance, the lithium battery inner layer composite film is coated with polyethylene terephthalate and polyvinyl acetal After butyraldehyde, it is compounded by extrusion method;

[0046] The inner basement film is obtained by the following preparation steps:

[0047] 1), 20 parts of ternary copolymerization polypropylene, 0.5 part of graphene, 0.2 part of pentaerythritol tetraacrylate, and 0.2 part of dicumyl peroxide are mixed to obtain the first mixture; graphene is mixed with ternary copolymerization polypropylene to achieve mixing the purpose of the modification;

[0048] 2), mixing 30 parts of homopolypropylene, 0.5 part of graphene, 0.2 part of pentaerythritol tetraacrylate, and 0.2 part of dicumyl peroxide to obtain a second mixture;

[0049] 3), first mix polypropylene and polyethylene according to the mass fraction of 4:1 to obtain mixed polypropylene, then mix 20 ...

Embodiment 2

[0070] see Figure 1-3 As shown, a lithium battery inner layer composite film with super corrosion resistance, the lithium battery inner layer composite film is coated with polyethylene terephthalate and polyvinyl butyrate in sequence on the upper and lower surfaces of the inner base film After the aldehyde, it is compounded by the method of extrusion;

[0071] The inner basement film is obtained by the following preparation steps:

[0072] 1), 30 parts of ternary copolymerized polypropylene, 0.7 parts of graphene, 0.4 parts of glycerol triacrylate, 0.3 parts of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane mixing to obtain a first mixture;

[0073] 2), 50 parts of homopolypropylene, 0.6 parts of graphene, 0.3 parts of glycerol triacrylate, and 0.3 parts of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane are mixed to obtain the second mixture;

[0074] 3) Mix polypropylene and polyethylene according to the mass fraction of 4:1 to obtain mixed polypropylene; mix 40 parts of pol...

Embodiment 3

[0087] see Figure 1-3 As shown, a lithium battery inner layer composite film with super corrosion resistance, the lithium battery inner layer composite film is coated with polyethylene terephthalate and polyvinyl butyrate in sequence on the upper and lower surfaces of the inner base film After the aldehyde, it is compounded by the method of extrusion;

[0088] The inner basement film is obtained by the following preparation steps:

[0089] 1), 50 parts of terpolymerized polypropylene, 1.1 parts of graphene, 0.55 parts of triacryl isocyanurate, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexyl 0.75 parts of alkane are mixed to obtain the first mixture;

[0090] 2), 50 parts of homopolypropylene, 1.5 parts of graphene, 0.62 parts of tripropenyl isocyanurate, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane 0.68 parts were mixed to obtain the second mixture;

[0091] 3), first mix polypropylene and polyethylene according to the mass fraction of 4:1 to obtain mixed polypropylene, then m...

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Abstract

The invention discloses a lithium battery inner layer composite film with super corrosion resistance and a preparation method thereof. The lithium battery inner layer composite film is formed by sequentially coating polyethylene terephthalate and polyethylene terephthalate on the upper and lower surfaces of the inner layer base film. After the polyvinyl butyral, it is obtained by extruding and compounding; the inner layer base film is composed of 18.5-51.7 parts of terpolymer polypropylene, 28.4-52.8 parts of homopolymerized polypropylene, and 17.6 parts of mixed polypropylene in parts by weight. -55.6 parts, graphene 1.3-15.5 parts, cross-linking monomer 0.52-9 parts, initiator 0.28-9.4 parts, nylon 4.3-10.6 parts are prepared, which solves the problem of puncture resistance, electrolyte resistance and high barrier of the inner layer base film , high insulation and poor heat seal strength.

Description

technical field [0001] The invention belongs to the technical field of lithium battery inner layer composite film production, and in particular relates to a lithium battery inner layer composite film with super corrosion resistance and a preparation method thereof. Background technique [0002] The electrolyte of lithium batteries contains a variety of organic solvents. Organic solvents usually swell, dissolve, and absorb flexible packaging materials. In addition, the organic solvent can dissolve the adhesive of the composite film, destroy the bonding effect between the composite layers, and change the composition of each group in the electrolyte. Part concentration, which in turn affects the electrical properties of the battery, so the inner membrane of the lithium battery must be resistant to the electrolyte. [0003] There are burrs on the copper mesh and aluminum mesh around the lithium-ion battery core. During the vacuuming operation of the package, the soft packaging f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/129H01M50/105H01M10/052C08J5/18C08L23/14C08L23/12C08K3/04H01M50/403H01M50/409H01M50/489
CPCH01M50/116H01M50/124H01M50/446H01M50/403Y02E60/10
Inventor 李汪洋胡伟吴磊周正发任凤梅张伟孙晓华徐凤锦刘志强王若愚张德顺郭浩
Owner JIESHOU CITY TIANHONG PACKAGING MATERIAL