Preparation method of polymer-inorganic composite electrolyte

Abstract

The invention belongs to the field of lithium batteries, and particularly relates to a preparation method of a polymer-inorganic composite electrolyte and a preparation method of a lithium battery. The preparation method of the polymer-inorganic composite electrolyte comprises the following steps: 1, adding a polymer, inorganic nanoparticles and an inorganic oxide electrolyte into a solvent, and performing stirring to form uniform slurry; 2, coating an electrode or a diaphragm matrix with the slurry, and performing drying to form a polymer-inorganic composite membrane; 3, soaking the polymer-inorganic composite membrane in a lithium salt solution to make the polymer-inorganic composite membrane fully contact a lithium salt, and carrying out vacuum drying to obtain the polymer-inorganic composite electrolyte. The invention provides the preparation method of the polymer-inorganic composite electrolyte for the lithium ion / lithium battery and the preparation method of the lithium battery,and the preparation methods can realize rapid, low-cost and large-scale production.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and in particular relates to a preparation method of a polymer-inorganic composite electrolyte and a preparation method of a lithium battery. Background technique [0002] Existing techniques and drawbacks: [0003] Lithium-ion battery is one of the most widely used batteries at present. It has the advantages of high specific energy, high specific power, good low temperature performance, long life, and no memory effect. Traditional lithium-ion batteries use flammable liquid organic electrolytes. Various accidents inside and outside the battery during use will cause internal short circuits and thermal runaway in the battery, resulting in safety issues such as fire and explosion. To deal with this problem, the use of non-flammable polymer-inorganic composite electrolytes as separators for Li-ion batteries is an effective means. At present, the preparation of polymer-inorganic composite electrolyt...

AI Technical Summary

Problems solved by technology

At present, these two membrane-making methods are mostly used in preliminary experiments or small-scale production, and are rarely used in mass production. There are two main reasons. One is that most polymer-inorganic composite electrolytes containing lithium salts It still has a high viscosity and cannot be rolled, otherwise the electrode roll or electrolyte diaphragm roll will be completely stuck and cannot be opened; the second is that the lithium salt used in the polymer-inorganic composite electrolyte may be extremely sensitive to moisture, so the preparation The process has extremely high requirements for environmental moisture, which may not be satisfied by the general drying room environment, resulting in a substantial increase in production costs

Therefore, the existing preparation methods of polymer-inorganic composite electrolytes are difficult to achieve mass production