A preparation method of an all-solid-state polymer electrolyte and an all-solid-state polymer battery

Abstract

The invention relates to a preparation method of an all-solid-state polymer electrolyte and an all-solid-state polymer battery. The preparation steps of the electrolyte are as follows: polymerizing apolycarbonate monomer with a carboxyl or hydroxyl polycarbonate monomer to obtain a polymer A; Adding polyether monomer, polyethylene glycol propylene monomer and functional polymer into solvent, adding lithium salt, initiator, selectively adding auxiliary agent and functional filler, and carrying out initiation reaction to obtain polymer B; Adding polymer A and polymer B into solvent and selectively adding carboxyl crosslinking agent to uniformly mix to obtain polymer mixing system; The hydroxyl crosslinking agent is added into the polymer mixing system and uniformly mixed, the obtained mixedliquid is uniformly coated on a mold, and the crosslinking reaction is carried out under an inert gas atmosphere in a vacuum drying box; At that end of the reaction, the polymer electrolyte membraneis vacuum dry 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 ionic 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...

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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.

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