Aluminum-plastic composite film for lithium battery and preparation method of aluminum-plastic composite film
A technology of aluminum-plastic composite film and lithium battery, which is applied in the direction of lithium storage battery, battery pack parts, chemical instruments and methods, etc. performance, avoid the effect of performance degradation
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Embodiment 1
[0051] Take an aluminum foil with a length of 300m and a width of 520mm, and set the line speed at 40m / min to pass through three-stage deionized water cleaning tanks and an oven at 120°C to elute foreign matter and grease on the surface of the aluminum foil. The dried aluminum foil is subjected to plasma treatment with a voltage of 3000V to further remove the grease on the surface of the aluminum foil and form a rough surface to increase adsorption.
[0052] Take 50 parts of the passivation solution stock solution and add 12.5 parts of pure water to dilute it to prepare a passivation solution with a pH value of 2 to 5, and apply the prepared passivation solution on both sides of the aluminum foil through a mesh roller, preferably 200 head. Dry the aluminum foil coated with the passivation solution at a temperature of 180°C to form a dense and inactive oxide layer on the surface of the aluminum foil.
[0053] Add 80 parts of ethyl acetate solvent to 20 parts of the outer layer...
Embodiment 2
[0060] The difference from Example 1 is that: 30 parts of alkaline substances are added to 90 parts of the raw material of the inner adhesive layer and mixed evenly, and 80 parts of ethyl acetate solvent is added to the mixed material of the inner adhesive layer to dissolve and mix to form the inner layer glue Then apply the inner glue suspension to the other side of the above-mentioned aluminum foil to form a 4um thick inner adhesive layer. After baking at a high temperature of 90°C, the heat-sealing layer film is laminated to the inner adhesive by a pressure of 0.3MPa. The knot layer forms a heat seal layer.
[0061] The basic substance used is a basic organic salt, preferably, the basic substance is lithium hexamethyldisilazide. Compared with Example 1, because the alkaline substance used in Example 2 is easy to dissolve in the solvent, the solid particle size has little effect on the use effect.
Embodiment 3
[0063] Add 30 parts of alkaline substances to 90 parts of the inner adhesive layer raw materials and mix well, add 80 parts of ethyl acetate solvent to the inner adhesive layer mixed material to dissolve and mix to form the inner layer glue suspension, and then the inner layer Apply the glue suspension to the other side of the above aluminum foil to form a 4um thick inner bonding layer. After baking at a high temperature of 90°C, the heat-sealing layer film added with alkaline substances is laminated to the inner bonding layer under a pressure of 0.35MPa. layer to form a heat seal layer.
[0064] The alkaline substance added to the inner bonding layer material is lithium hexamethyldisilazide, and the alkaline substance added to the heat-sealing layer film is sodium silicate.
[0065] The difference from Example 1 is that the raw material of the heat-sealing layer is melt-extruded at a temperature of 250°C, and the heat-sealing layer melt is compounded to the other side of the ...
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Abstract
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