A kind of high-conductivity gel polymer electrolyte applied to aluminum-air battery and its preparation method and application

Abstract

The invention relates to a preparation method of a high-conductivity alkaline gel polymer electrolyte, which comprises mixing and stirring a polyvinyl alcohol solution and a polyethylene oxide solution to obtain a uniform and stable polymer solution; then adding N,N'- Methylenebisacrylamide cross-linking agent solution and potassium hydroxide solution, mix well. The gel polymer electrolyte of the present invention is composed of polyvinyl alcohol and polyethylene oxide under the action of cross-linking agent N,N'-methylenebisacrylamide, forming a non-crystalline structure with high thermal stability, high water retention and Transparency, and a three-dimensional network structure with certain deformation ability, the conductivity can be stably maintained at 0.199 S cm ‑1 around, the power density is about 43.3 mW cm ‑2 , can meet the requirements of the metal-air battery; the preparation process of the electrolyte of the invention is simple, the cost is low, and the raw materials used are cheap 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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