A kind of preparation method of aluminum-plastic film for lithium ion battery

Abstract

Provided is a method for preparing an aluminum-plastic film for a lithium-ion battery, which comprises the following steps: a) converting the solid polypropylene resin used in the preparation of the aluminum-plastic film by a casting composite method into a soluble polypropylene resin through a modified grafting treatment method , and then the soluble resin is formulated into an adhesive for coating; b) the adhesive is coated on the surface of one of the aluminum film and the polypropylene film, and dried to volatilize the solvent in the adhesive; c) Improving the fluidity of the adhesive coating, and then attaching it to the surface of the other of the aluminum film and the polypropylene film; d) performing low-temperature curing to allow the adhesive layer to creep between the aluminum film and the polypropylene film Leveling and completing the entire curing process to obtain aluminum-plastic films for lithium-ion batteries. The aluminum-plastic film obtained by the method of the present invention retains the superior performance of the thermal aluminum-plastic film in resisting electrolyte, avoids the high-temperature and high-pressure manufacturing conditions in the process of preparing the aluminum-plastic film by the thermal method, and effectively maintains the drawing performance and performance of the aluminum foil. Appearance.

Description

technical field [0001] The present invention generally relates to the technical field of aluminum-plastic films, in particular to a method for preparing aluminum-plastic films for lithium-ion batteries. Background technique [0002] With the development of smart phones, new energy vehicles and distributed power stations, lithium battery soft packs, power battery soft packs, and energy storage battery soft packs for smart devices have all experienced leapfrog development. Soft-pack lithium-ion batteries are getting closer and closer to life. While meeting people's needs for high energy density, thinness and shortness, their safety and reliability have increasingly become the focus of attention. [0003] At present, the preparation methods of aluminum-plastic films can be classified into two types: coating composite method (dry method) and casting composite method (thermal method). The advantage of dry-process aluminum-plastic film is that the product has a better appearance ...

AI Technical Summary

Problems solved by technology

The advantage of dry-process aluminum-plastic film is that the product has a better appearance and superior drawing performance. The disadvantage is that the adhesive used has weak resistance to the electrolyte and a low peeling force against the electrolyte.

The advantage of thermal aluminum-plastic film is that because of the use of hot-melt resin polypropylene (PP) as the adhesive layer, the electrolyte resistance of the aluminum-plastic film is improved, and the peeling force of the electrolyte is greatly improved. The disadvantage is the appearance Poor, more resin crystal points, affected by high temperature and high pressure conditions in the production process, the drawing performance of aluminum plastic film is poor

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