A kind of preparation method of all-solid polymer electrolyte and all-solid polymer battery

Abstract

A preparation method of an all-solid polymer electrolyte and an all-solid polymer battery. The preparation steps of the electrolyte are as follows: polycarbonate monomers and carboxyl or hydroxyl polycarbonate monomers are polymerized to obtain polymer A; polyether Add monomer, polyethylene glycol propylene-based monomer and functional polymer into the solvent, add lithium salt, initiator, selectively add auxiliary agent and functional filler, and carry out initiation reaction to obtain polymer B; combine polymer A and Add polymer B into the solvent, and optionally add carboxyl crosslinking agent and mix uniformly to obtain a polymer mixing system; add hydroxyl crosslinking agent to the polymer mixing system and mix uniformly, and evenly coat the obtained mixed solution on the mold Above, the cross-linking reaction was carried out in an inert gas atmosphere in a vacuum drying oven; after the reaction, vacuum drying was carried out in an inert gas atmosphere to obtain an all-solid polymer electrolyte membrane. The solid polymer electrolyte of the invention has good compatibility and mechanical strength and high room temperature ion conductivity.

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 polymer electrolyte and a lithium-ion all-solid polymer battery. Background technique [0002] Due to its high energy density and good reliability, lithium-ion batteries have developed by leaps and bounds in the past three decades. Traditional lithium-ion batteries mostly use liquid electrolytes, such as organic solvents such as ethylene carbonate and propylene carbonate. Because the liquid electrolyte will lead to safety problems such as leakage, fire, and explosion of lithium-ion batteries, the further development of lithium-ion batteries is limited. [0003] All-solid polymer electrolytes can overcome the above shortcomings of liquid electrolytes and improve the safety performance of lithium-ion batteries. An ideal all-solid polymer electrolyte should have the following characteristics: 1. High ionic conductivity...

AI Technical Summary

Problems solved by technology

However, it is difficult for existing all-solid polymer electrolytes to have the above characteristics at the same time.

For example, the traditional polyether-based lithium-ion battery solid electrolytes have insufficient room temperature ionic conductivity and mechanical strength. One method to improve the room temperature ionic conductivity of polyether-based solid electrolytes is to introduce carbonate-based solid electrolytes, but the introduction of carbonate-based solid electrolytes The method of electrolyte is generally copolymerization or mixing. The copolymerization method is easy to change the flexibility of the molecular chain, reducing the mobility of the molecular chain and thus weakening the ionic conductivity, while the mixing method has compatibility problems, which is easy to reduce the mechanical strength and energy density of the electrolyte.

Images