Preparation method of modified carbon nanotube doped solid polymer electrolyte

Abstract

The invention discloses a preparation method of a modified carbon nanotube doped solid polymer electrolyte. The preparation method comprises the concrete steps of mixing a hydroxyl carbon nanotube, a vinyl silane coupling agent, ammonia water, anhydrous alcohol and deionized water at a certain ratio, performing heating to be 80 DEG C, performing magnetic stirring for 8-12h, performing suction filtration, washing and drying, performing ultrasonic for half an hour on an obtained modified carbon nanotube, polyethylene glycol methacrylate, lithium salt, potassium persulfate and the deionized water at a certain ratio at a room temperature, performing magnetic stirring until a well dispersed suspension is formed, casting the suspension into a polytetrafluoroethylene die, performing a reaction for 6-10h in an oven at 70 DEG C, performing temperature rise to be 80 DEG C, performing keeping for 24h, and then performing drying to obtain a modified carbon nanotube doped solid polymer electrolyte membrane. The method is simple in production process and high in production efficiency; and the prepared modified carbon nanotube doped solid polymer electrolyte has high ionic conductivity and good mechanical strength at the room temperature, and can meet an application demand of a lithium battery.

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.