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A metal composite film, electrochemical device
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A metal composite and intermediate metal technology, applied in the field of aluminum-plastic film production, can solve problems such as unsatisfactory anti-corrosion treatment effects, affecting the promotion and use of metal composite films, and separation between layers of metal composite films, so as to improve the initial peel strength. Effect
Active Publication Date: 2021-08-10
JIANGXI RUIERGY NEW MATERIAL TECH CO LTD
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Problems solved by technology
However, during long-term use of the battery, moisture may permeate the outer packaging of the battery, causing the electrolyte to produce hydrogen fluoride (HF). The separation between metal composite films affects the promotion and use of metal composite films in the field of lithium-ion batteries
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Embodiment 1
[0218] The metal foil used is 8079 series annealed aluminum foil with a thickness of 30 μm and a surface wettability of 70 dyn / cm. It contains 25, 5, 10 and 5 parts by mass of trivalent chromium compound, inorganic acid, organic resin and titanate. The trivalent chromium compound is chromium fluoride, the inorganic acid is hydrofluoric acid, the organic resin is polyvinyl alcohol resin, and the titanate is fluorotitanic acid. The chromium content in the anti-corrosion layer is 20mg / m 2 .
[0219] The outer substrate resin layer 1 is made of asynchronous biaxially stretched nylon film with a thickness of 30 μm, and the inner adhesive layer 7 is compounded with the thermally welded resin layer 8 in the manner of B-1-a.
Embodiment 2
[0221] The metal foil used is 8021 series annealed aluminum foil with a thickness of 40 μm and a water contact angle of 10°. Both sides of the aluminum foil have undergone anti-corrosion treatment. The parts are 35 parts, 5 parts, 10 parts and 5 parts of trivalent chromium compound, inorganic acid, organic resin and titanate. The trivalent chromium compound is chromium fluoride, the inorganic acid is hydrofluoric acid, the organic resin is polyvinyl alcohol resin, and the titanate is fluorotitanic acid. The chromium content in the anti-corrosion layer is 10mg / m 2 .
[0222] The outer substrate resin layer 1 is made of asynchronous biaxially stretched polyethylene terephthalate film (PET) with a thickness of 25 μm, and the inner adhesive layer 7 is compounded with the heat-melt resin layer 8 in the manner of B-2-a.
Embodiment 3
[0224] The metal foil used is 8021 series annealed aluminum foil with a thickness of 35 μm and a water contact angle of 15°. Both sides of the aluminum foil have undergone anti-corrosion treatment. The parts are 25 parts, 3 parts, 10 parts and 3 parts of trivalent chromium compound, inorganic acid, organic resin and titanate. The trivalent chromium compound is chromium fluoride, the inorganic acid is hydrofluoric acid, the organic resin is polyvinyl alcohol resin, and the titanate is fluorotitanic acid. The chromium content in the anti-corrosion layer is 25mg / m 2 .
[0225] The outer substrate resin layer 1 is made of an asynchronous biaxially stretched nylon film with a total thickness of 15 μm, and the inner adhesive layer 7 is compounded with the thermally welded resin layer 8 in the manner of B-3-a.
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Abstract
The invention relates to the technical field of aluminum-plastic film production, and discloses a metal composite film, which includes an outer substrate resin layer, an intermediate metal layer, and a heat-welding resin layer; the middle metal layer is in contact with the heat-melting resin layer. The anti-corrosion layer is formed on the side; the composition of the anti-corrosion layer includes trivalent chromium compound, inorganic acid, organic resin; the composition of the anti-corrosion layer can also include titanate; the composition of the anti-corrosion layer can also include fluorine compounds. Using the above-mentioned anti-corrosion layer formula of the present invention can significantly improve the initial peel strength of the middle metal layer and the heat-welding resin layer of the metal composite film and the corrosion resistance in anhydrous or aqueous electrolyte environment.
Description
technical field [0001] The invention relates to the technical field of aluminum-plastic film production, in particular to a metal composite film and an electrochemical device using the metal composite film. Background technique [0002] At present, lithium-ion batteries are mainly divided into three categories: square, cylindrical, and soft. The square and cylindrical shells are mainly made of hard shells such as aluminum alloy and stainless steel. The aluminum alloy shell can be aluminum, and the soft shell made of metal and resin is laminated. The metal composite film is used for the case of the package, which greatly improves the problem of inflexible design of the hard-packed battery. [0003] However, as a battery outsourcing material, the metal composite film is required to be resistant to electrolyte corrosion, so as to prevent problems such as leakage of the battery case and ensure the service life of the battery. [0004] Generally, the metals in the metal composit...
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