Ceramic-based composite solid-state electrolyte and preparation method thereof

Abstract

The invention discloses a preparation method of ceramic-based composite solid-state electrolyte. The specific preparation method is characterized by comprising the following steps: preparation of gelelectrolyte, preparation of ceramic-based electrolyte and preparation of ceramic-based composite electrolyte, wherein the preparation of the gel electrolyte comprises the steps: mixing an acrylate material, a crosslinking agent and electrolyte, adding an initiator into the mixed solution and uniformly stirring after adding the initiator; in step 2, the preparation of the ceramic-based electrolytecomprises the following steps: preparing a binding agent and an N-methylpyrrolidone solvent into a solution according to the mass ratio of 1 to (10 to 20); weighing a fast ion conductor and lithium salt according to a stoichiometric ratio and adding into the solution; carrying out stirring, ultrasonic treatment and the like to obtain uniformly-dispersed slurry; uniformly coating the slurry on a glass plate and drying at 30 to 60 DEG C for 24h; then drying for 24h in vacuum and at 50 to 60 DEG C, so as to obtain an electrolyte film with the thickness of 10 to 150mu m.

Description

technical field [0001] The invention relates to a solid electrolyte for a lithium battery, relates to a ceramic matrix composite solid electrolyte, and also relates to a preparation method of the ceramic matrix composite solid electrolyte. Background technique [0002] At present, lithium-ion batteries generally use LiPF 6 carbonate solution as an organic liquid electrolyte. Because such batteries contain volatile and flammable liquid organic substances, there are safety hazards such as fire and explosion. Gel electrolytes have similar ionic conductivity to liquid electrolytes, and have high interfacial compatibility with positive and negative electrodes. Compared with liquid electrolytes, gel electrolytes are safer, but they cannot eradicate potential safety hazards. [0003] Among the solid electrolyte materials, there are mainly two types of polymer solid electrolytes and inorganic solid electrolytes. Among them, the polymer solid electrolyte is composed of organic pol...

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Problems solved by technology

[0004] Polymer solid electrolyte has good thermal stability, high safety performance, high electrolyte stability to lithium, and good cycle performance; however, polymer electrolyte has poor ability to wet electrodes, low lithium ion conductivity, and chemical reactions at the interface, etc. Problems Limit Polymer Solid Electrolyte Applications

Inorganic solid electrolytes have high lithium ion conductivity, wide electrochemical window, good thermal stability, and stable interface properties, but the preparation of solid electrolytes is difficult, poor interface contact, poor mechanical properties, and volume during battery cycling Problems such as battery performance attenuation caused by the carbon dioxide effect restrict the development of inorganic solid-state electrolytes

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