Functional composite packaging aluminum plastic film for lithium battery

Abstract

The invention relates to a functional composite packaging aluminum plastic film for a lithium battery. The functional composite packaging aluminum plastic film comprises a modified polypropylene layer, a nanopartice layer, a first binder layer, a fluorocarbon coating layer, an aluminum foil layer, a second binder layer and a nylon layer, wherein the aluminum plastic film is formed by sequentially laminating the modified polypropylene layer, the nanopartice layer, the first binder layer, the fluorocarbon coating layer, the aluminum foil layer, the second binder layer and the nylon layer from inside to outside. According to the functional composite packaging aluminum plastic film disclosed by the invention, due to the fact that the nanoparticle layer with high water absorptivity is added, the condition that water vapor enters into electrolyte to generate corrosive acids such as hydrofluoric acid and other gases can be effectively inhibited, and further the comprehensive barrier property of the aluminum plastic film is improved; besides, an inner layer of an aluminum foil in the aluminum plastic film is coated with fluorocarbon coating, so that the corrosion of the electrolyte to the aluminum foil can be effectively resisted, and the corrosion resisting property of the aluminum foil is enhanced. The functional composite packaging aluminum plastic film disclosed by the invention is produced by adopting a multilayer bonding and laminating composite technique, is simple in processing and easy to implement, and has excellent barrier property, heat sealing property, extending property and corrosion resisting property.

Description

technical field [0001] The invention relates to the field of battery packaging materials, in particular to a functionalized aluminum-plastic film for lithium battery composite packaging. Background technique [0002] With the rapid popularization and application of energy storage electronic products, mobile phones, electric transportation, etc., the demand for the application of energy storage batteries has also increased rapidly in recent years. In energy storage batteries, polymer lithium-ion batteries have many cycles and high energy density. And long service life and other advantages, has become one of the most widely used energy storage batteries in the energy storage industry. [0003] Polymer lithium-ion batteries are the main direction for the application of lithium-ion energy storage batteries in the future. Polymer lithium-ion batteries are mainly composed of electrodes, electrolytes, separators and packaging films. The role of packaging films is mainly to protect ...

AI Technical Summary

Problems solved by technology

The packaging film currently used for polymer lithium-ion batteries in the industry is also called aluminum-plastic film. It is a composite material composed of aluminum foil and other high-molecular polymer materials. It requires excellent barrier properties, ductility and heat-sealing properties, but currently There is no corresponding high-quality aluminum-plastic film in China that meets the application requirements of polymer lithium-ion batteries. The domestic aluminum-plastic film market is still mainly monopolized by several Japanese aluminum-plastic film production companies. The main core problem is that the barrier property does not meet the requirements of batteries. Enterprise requirements

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