A kind of preparation method of fluoride gel polymer electrolyte membrane and lithium ion battery

Abstract

In order to obtain an electrolyte membrane with high electrochemical stability, the present invention provides a preparation method of a fluoride gel polymer electrolyte membrane, which belongs to the technical field of lithium ion batteries. Add 100-300 parts of fluorine-containing vinyl monomer, 40-80 parts of gelable monomer, and 0-3 parts of polyethylene glycol methacrylate-based monomer into 100-300 parts of solvent, continue to blow nitrogen, stir evenly, and then add 0.05-1.00 parts of initiator, react at 60°C for 24 hours, and obtain polymer A after purification; Step 2: Add 30-80 parts of polymer A and 0-20 parts of filler into 100-300 parts of solvent, dry in nitrogen atmosphere Stir evenly under low pressure, add 0-2.00 parts of hydroxyl crosslinking agent into the mixing system, the mixed solution is evenly coated on a smooth mold, and react in a nitrogen atmosphere; Step 3: After the reaction is completed, vacuum dry to obtain fluoropolymer gel polymerization 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 a fluoride gel polymer electrolyte membrane and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, no memory effect, wide operating temperature range, and environmental friendliness. They have been widely used in electric vehicles, digital, large-scale energy storage, and national defense and military fields. At present, commercial lithium-ion batteries mainly use liquid electrolytes. During the use of lithium-ion batteries, liquid electrolytes may have safety problems such as leakage, flammability, and explosions due to external collisions, extrusion, and heat, which severely limit lithium-ion batteries. Large-scale application of ion batteries. At present, although there are certain measures to improve the safety of liquid lithium-ion batteries, the effect is minimal....

AI Technical Summary

Problems solved by technology

[0004] Fluorine-containing polymers have always been the main material in lithium-ion batteries. The Chinese invention patent application with the publication number CN201710181998.3 discloses a single-ion polymer electrolyte formed by copolymerization of sodium styrene sulfonate and fluorine-containing acrylate, although Lithium ion migration number is high, but the electrical conductivity is too low for industrial application

The Chinese invention patent application with the application number CN 201610487646.6 discloses a multi-polymerization of sodium styrene sulfonate, polyethylene glycol methacrylate, hexafluorobutyl methacrylate, and ethylene carbonate. Introduce a strong electron-withdrawing perfluoroalkyl group at the molecular level. This structure can promote the ionization of lithium ions to a certain extent and improve the mechanical properties of the electrolyte membrane, but the effect is limited.

According to current patents and literature reports, although individual performance is outstanding, there is still a certain distance from industrial application

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