High-conductivity gel polymer electrolyte applied to aluminum-air battery as well as preparation method and application of high-conductivity gel polymer electrolyte

Abstract

The invention relates to a preparation method of a high-conductivity alkaline gel polymer electrolyte. The method comprises the following steps: mixing and stirring a polyvinyl alcohol solution and a polyethylene oxide solution to obtain a uniform and stable polymer solution; and then adding an N,N'-methylene bisacrylamide cross-linking agent solution and a potassium hydroxide solution, and performing uniform mixing to obtain the product. The gel polymer electrolyte is a three-dimensional network structure which has an amorphous structure, high thermal stability, high water-retaining property, high transparency and certain deformability and is prepared from polyvinyl alcohol and polyethylene oxide under the action of a cross-linking agent N,N'-dimethylformamide, the conductivity can be stably maintained at about 0.199 S cm<-1>, the power density is about 43.3 mW cm<-2>, and the requirements of a metal-air battery can be met. The preparation process of the electrolyte is simple, the cost is low, and the used raw materials are low in price and easy to obtain.

Description

technical field [0001] The invention belongs to the technical field of aluminum-air batteries, and relates to a high-conductivity alkaline gel polymer electrolyte prepared by utilizing polyvinyl alcohol, polyethylene oxide and N,N'-methylenebisacrylamide and a preparation method thereof and apply. Background technique [0002] Aluminum-air batteries have a high theoretical energy density (8100Wh kg -1 ), metal aluminum is light in weight, rich in raw materials, long battery life, non-toxic and harmless, environmentally friendly and other advantages have been widely studied, but the electrolyte of liquid aluminum-empty batteries is easy to leak, there are safety problems, and metals exist in alkaline solutions Severe self-corrosion greatly affects the performance of the battery in all aspects. [0003] In recent years, gel polymer electrolytes (GPEs), as a new type of electrolyte, have become a research hotspot due to their good mechanical properties and thermal stability, ...

AI Technical Summary

Problems solved by technology

The gel polymer electrolyte is difficult to absorb a large amount of alkaline electrolyte due to the low porosity of the formed network framework, resulting in low conductivity and power density of the metal-air battery.

At present, the methods to solve such problems include: adding inorganic substances as a network framework; adding pore-forming agents to increase the porosity of the electrolyte; adding corrosion inhibitors to inhibit the self-corrosion of metals and other methods to improve the electrochemical performance of metal-air batteries. performance, but these methods are more complicated and the preparation cost is higher

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