Preparation method of solid state lithium ion batteries

Abstract

The invention belongs to the technical field of material new energy, and more specifically relates to a preparation method of solid state lithium ion batteries. The preparation method comprises following steps: a cathode active substance, a conductive agent, and a binder are added into a solvent so as to prepare a cathode slurry, screen printing technology is adopted to prepare a positive plate, and drying treatment is carried out; at a protective atmosphere, polyoxyethylene, a lithium salt, a nanometer inorganic oxide, and ethyl cellulose are added into a solvent so as to obtain a polymer slurry, screen printing technology is adopted to prepare a polymer electrolyte film on the positive plate, and drying treatment is carried out; the positive plate, the polymer electrolyte film, and a negative lithium plate are subjected to sealing assembling in a punching machine so as to obtain a button solid state lithium ion battery. The shape of the prepared solid state lithium ion battery is controllable; the polymer electrolyte film and the electrode materials are combined preferably; interface performance is ensured; battery performance is better; the preparation method is simple in operation; and cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of new material energy, and in particular relates to a preparation method of a solid-state lithium ion battery. Background technique [0002] In recent years, with the continuous advancement of technology, the gradual reduction of costs, and the strong support of national policies, lithium-ion batteries have been widely used in electric vehicles, aerospace equipment, ships, mobile phones, notebook computers and other fields. Conventional lithium-ion batteries use liquid electrolytes. Due to the narrow temperature range of the safe and stable existence of organic solvents, the safety of liquid lithium-ion batteries is poor. In addition, liquid electrolytes are in contact with electrode materials for a long time, which can easily lead to corrosion of electrode materials and affect the battery. life. Solid-state lithium-ion batteries use solid-state electrolytes, which are inherently safe. At present, solid-s...

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Problems solved by technology

[0003] The common preparation methods of solid-state lithium-ion battery cathode sheets include magnetron sputtering and coating methods. The magnetron sputtering method is expensive and the cost is too high. The coating method needs to scrape the positive electrode slurry on the current collector. The process of cutting the film into specific properties is too cumbersome, and the process of cutting the film is prone to powder drop and other phenomena that affect the performance of the battery

[0004] The common preparation method of polymer electrolyte membrane for solid-state lithium-ion batteries is to coat the polymer colloid on the support, and after the solvent volatilizes, the membrane is removed from the support for use. It is inevitable that when the battery is assembled, it is necessary to Positive electrode sheet, polymer electrolyte membrane, and negative electrode sheet are stacked, which makes the interface performance between solids poor

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