Preparation method of all-solid-state fluorine-containing polymer electrolyte membrane and lithium ion battery

Abstract

In order to obtain an electrolyte membrane with high electrochemical stability, the invention provides a preparation method of an all-solid-state fluorine-containing polymer electrolyte membrane, which belongs to the technical field of lithium ion batteries. The preparation method comprises the following steps: step I, adding 5 to 50 parts of fluorine-containing vinyl monomer, 40 to 80 parts of polyether monomer, and 0 to 3 parts of polyethylene glycol methyl acrylate monomer into 100 to 300 parts of solvent, continuously introducing nitrogen, stirring at a rotation speed of 100 to 800 r / min,adding 0.05 to 1.00 part of initiator, reacting for 5 to 48 hours at 60 to 110 DEG C, purifying to obtain a polymer A; step II, adding 30 to 80 parts of polymer A, 5 to 20 parts of lithium salt, and 0to 20 parts of filler and auxiliary into 100 to 300 parts of solvent, stirring at the rotation speed of 100 to 800 r / min in dry nitrogen atmosphere, stirring for 1 to 10 hours, adding 0 to 2.00 partsof hydroxyl cross-linking agent into a mixed system, uniformly smearing a mixed solution onto a special mold, and reacting for 6 to 24 hours at 60 to 100 DEG C in the nitrogen atmosphere of a vacuumdrying box; and step III, after the reaction is ended, drying for 30 to 60 hours at 90 to 98 DEG C in the nitrogen atmosphere, so as to obtain the all-solid-state fluorine-containing polymer electrolyte membrane.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of an all-solid fluorine-containing polymer electrolyte membrane and a lithium ion battery. Background technique [0002] Lithium-ion batteries are currently widely used in the field of energy storage and power vehicles due to their high power density, long service life, and high energy density. Lithium-ion batteries are generally safe, but because they use liquid electrolytes as electrolytes, there are safety issues such as explosion and fire during the use of lithium-ion batteries. Up to now, safety still limits the use of lithium-ion batteries in high-ratio Energy, high power and other special fields of application. As the most likely next-generation lithium-ion battery, solid-state batteries have the advantages of high safety and high energy density. The solid-state battery removes the electrolyte, avoids the dangers of electro...

AI Technical Summary

Problems solved by technology

The main representative of polymer electrolytes is polyethylene oxide. The special ether oxygen structure of polyethylene oxide can dissociate lithium salts and transport lithium ions. However, at present, there are low room temperature conductivity, narrow electrochemical window, and poor machinability. problems, which limit its application

[0004] In order to improve the shortcomings of the all-solid polymer electrolyte, the Chinese invention patent application with the application number CN 201610487646.6 discloses a kind of sodium styrene sulfonate, polyethylene glycol methacrylate, hexafluorobutyl methacrylate and ethylene carbonate Ethylene ester is used as a monomer to prepare a copolymerized polymer electrolyte. Although the polymer electrolyte has outstanding mechanical properties, its electrical conductivity is low.

The Chinese invention patent application with the application number CN 201710181998.3 discloses a single-ion polymer electrolyte formed by the copolymerization of sodium styrene sulfonate and fluorine-containing acrylate. Although the lithium ion migration number is high, the electrical conductivity is too low for industrial application

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