Lithium ion secondary battery composite electrolyte film, and making method and application thereof

Abstract

The invention concretely relates to a lithium ion secondary battery composite electrolyte film, and a making method and an application thereof. The making method of the lithium ion secondary battery composite electrolyte film comprises the following steps: 1) preparing inorganic electrolyte powder with the diameter of 10-100nm; 2) preparing a surface modified inorganic electrolyte powder material; and 3) making the composite electrolyte film. The lithium ion secondary battery composite electrolyte film with the advantages of high ion conductivity, good flexibility and easy processing can be made by adopting a conductive polymer containing a small amount of a lithium salt as a flexible conductive skeleton and adopting the high conductivity characteristic of the surface silanized inorganic electrode material through a slurry coating technology.

Description

【Technical field】 [0001] The invention relates to the technical field of electrolyte film preparation and application, in particular to a lithium-ion secondary battery composite electrolyte film and its preparation method and application. 【Background technique】 [0002] Lithium-ion batteries have become the main power source in the electronic product market since their appearance in the early 1990s, and they have increasingly occupied a larger market share in electric vehicle power supplies and energy storage systems. In recent years, with the upgrading of electronic products and the rapid development of new energy vehicles, lithium-ion batteries with high safety, deformability and high safety have become an important development direction of lithium-ion batteries in the future. [0003] The liquid electrolyte solution system is an important part of conventional lithium-ion batteries due to its high lithium ion conductivity. The main obstacle to the expansion of application...

AI Technical Summary

Problems solved by technology

[0004] In the patent application CN103515649.A, which was applied for and published in China, a preparation method of an organic / inorganic composite electrolyte is introduced. Lithium salt and modified lithium metaaluminate are dispersed in a polymer that also has oxyethylene repeating units to obtain Organic / inorganic composite electrolyte materials have been developed, but the conductivity of the obtained electrolyte is still not ideal, and the processing performance has not been improved.

In the patent application CN101045762.A, which was applied for and published in China, an organic-inorganic composite polymer electrolyte and its preparation method are introduced. The method uses the emulsion polymer method to carry out polymethyl acrylate coating modification on nano-titanium dioxide ions. Copolymerization of acrylonitrile and acrylonitrile methyl ester on the surface of nano-titanium dioxide particles by solution polymerization, although the electrical conductivity has been improved to a certain extent, these inorganic nanoparticles have high specific surface energy and are easy to agglomerate during the cycle, thus weakening the The role of nanoparticles in polymers to improve Li-ion conductivity and stabilize interfaces