Polyethylene oxide-polypropylene oxide copolymerized solid polymer electrolyte and preparation method thereof

Abstract

The invention discloses polyethylene oxide-polypropylene oxide copolymerized solid polymer electrolyte and a preparation method thereof. Block copolymerization of materials comprising double-bond capped polyethylene oxide and amino-capped polypropylene oxide and lithium salt is implemented at high temperature to obtain a solid polymer electrolyte material. The weight ratio of the double-bond capped polyethylene oxide to the polypropylene oxide with two amino-modified ends is 1:10-5:1. According to the method, overall technology procedures of key preparation processes, reaction conditions of steps and the like are improved, an organic block copolymer solid electrolyte is correspondingly formed, the room-temperature conductivity of the solid electrolyte can be improved as compared with the prior art, a preparation process is simple and easy, production cost is reduced, and production efficiency is improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery electrolytes, and in particular relates to a block copolymer solid electrolyte and a preparation method thereof, in particular to a polyethylene oxide-polypropylene oxide copolymer solid polymer electrolyte and a preparation method thereof. Background technique [0002] Energy storage devices are a key technology for modern human progress. Lithium-ion secondary batteries have many advantages such as high working voltage, long cycle life, and less environmental pollution, and have become a very common green chemical energy source. A new generation of high-energy lithium batteries is the development direction of energy storage devices in the future. However, due to the use of organic electrolytes in high-energy-density lithium batteries, there are a series of safety hazards such as leakage, fire, and explosion. Improving battery safety has become the current The focus of the research. [0003] I...

AI Technical Summary

Problems solved by technology

The specific methods include: adding a plasticizer, this method can greatly increase the electrical conductivity, the preparation is simple, and the price is cheap, but it will lead to a decrease in mechanical properties, and the compatibility and stability between the components will decrease; adding an ionic liquid, this method The method can improve the ionic conductivity, and the prepared material has good thermochemical and electrochemical stability, but the mechanical properties of the material are reduced, the ion mobility is not significantly improved, and the price is expensive; adding nanoparticles, this method takes into account the electrical conductivity and mechanical properties, cheap, high security, but still can not meet commercial requirements

The raw materials used in the above methods are all expensive experimental grade reagents, and the preparation process is relatively harsh, which cannot meet the needs of large-scale industrial production.

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