A kind of preparation method of modified carbon nanotube doped solid polymer electrolyte

Abstract

The invention discloses a method for preparing a modified carbon nanotube-doped solid polymer electrolyte, specifically mixing hydroxyl carbon nanotubes, vinyl silane coupling agent, ammonia water, absolute ethanol and deionized water in a certain proportion , heated to 80°C and magnetically stirred for 8 to 12 hours, filtered, washed and dried, the obtained modified carbon nanotubes, polyethylene glycol methacrylate, lithium salt, potassium persulfate, and deionized water were mixed in a certain proportion Sonicate for half an hour at room temperature, stir magnetically until a well-dispersed suspension is formed, then pour it into a polytetrafluoroethylene mold, put it in an oven at 70°C for 6-10 hours, then raise the temperature to 80°C for 24 hours to dry The modified carbon nanotube doped solid polymer electrolyte membrane is obtained. The method has simple production process and high production efficiency; the prepared modified carbon nanotube doped solid polymer electrolyte has high ion conductivity and good mechanical strength at room temperature, and can meet the application requirements of lithium batteries.

Description

technical field [0001] The invention belongs to the technical field of batteries, in particular to a preparation method of a solid polymer electrolyte for a lithium-ion secondary battery. Background technique [0002] Lithium-ion batteries are the most widely commercially available energy storage devices. Traditional lithium-ion batteries are prone to leakage due to the use of electrolytes, and the growth of lithium dendrites can cause short circuits, which can cause safety accidents. The use of gel polymer electrolyte, although it can ensure high ionic conductivity, has low mechanical strength and cannot inhibit the growth of lithium dendrites, resulting in poor battery cycle performance. Therefore, it is necessary to develop polymer electrolytes with high electrical conductivity and good mechanical strength. [0003] Although the polyoxyethylene-based solid polymer electrolyte has low conductivity at room temperature due to its chain segment crystallinity, its mechanical...

AI Technical Summary

Problems solved by technology

Traditional lithium-ion batteries are prone to leakage due to the use of electrolytes, and the growth of lithium dendrites can cause short circuits, causing safety accidents

However, the use of gel polymer electrolytes can ensure high ionic conductivity, but its mechanical strength is low and cannot inhibit the growth of lithium dendrites, resulting in poor battery cycle performance.