Special aluminum foil for soft package polymer lithium-ion battery film and preparation technology of special aluminum foil

Abstract

The invention relates to a special aluminum foil for a soft package polymer lithium-ion battery film. The special aluminum foil comprises a first carbon-coated layer, a first silicide layer, an aluminum foil alloy layer, a second silicide layer and a second carbon-coated layer, wherein the aluminum foil has a layered structure; and the special aluminum foil for the soft package polymer lithium-ion battery film sequentially comprises the first carbon-coated layer, the first silicide layer, the aluminum foil alloy layer, the second silicide layer and the second carbon-coated layer from inside to outside. Alloy aluminum is adopted by the aluminum foil, so that the aluminum foil has relatively good ductility. The surface of the alloy aluminum foil is subjected to siliconization, so that the barrier property and the antiseptic property of the aluminum foil can be improved. Meanwhile, a carbon coating is added to the outmost layer of the aluminum foil, so that excellent static conductivity is provided; and micro-current of active materials is collected. Therefore, the contact resistance between a positive/negative material and collected current can be greatly reduced; the adhesive ability between the positive/negative material and the collected current can be improved; and the dosage of an adhesive can be reduced to obviously improve the overall performance of a battery. The aluminum foil can meet the requirements of a soft package film material of the polymer lithium-ion battery on the ductility, the barrier property and strong caking property of the aluminum foil; and the aluminum foil material provided by the invention can be used as a raw material for preparing the soft package film.

Description

technical field [0001] The invention relates to the field of battery packaging materials, in particular to an aluminum foil material for soft packaging polymer lithium-ion battery special membranes. Background technique [0002] Polymer lithium-ion batteries are the main development direction of lithium-ion batteries in the future. How to ensure and improve the energy storage and charging time of polymer lithium-ion batteries is not only related to the positive and negative electrode materials of the battery and the polymer electrolyte, but also to the polymer electrolyte. Lithium-ion battery packaging film is closely related. [0003] The choice of polymer lithium-ion battery outer packaging film is directly related to the stable operation and service life of the battery, because this type of battery outer packaging film is required to have better barrier properties, heat sealability and stretchability, and the outer packaging film is resistant to moisture. , The barrier p...

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Problems solved by technology

[0003] The choice of polymer lithium-ion battery outer packaging film is directly related to the stable operation and service life of the battery, because this type of battery outer packaging film is required to have better barrier properties, heat sealability and stretchability, and the outer packaging film is resistant to moisture. , The barrier property of oxygen is 10,000 times higher than that of ordinary outer packaging composite film, because the entry of a small amount of water or oxygen will change the composition of the electrolyte and produce highly corrosive hydrofluoric acid. When hydrofluoric acid exists, it will seriously Corrosion of aluminum foil to separate the inner film from the aluminum foil, and then corrode and perforate the aluminum foil, thereby destroying the entire outer packaging

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