Biodegradable blend-type polymer electrolyte membrane and preparation method thereof

Abstract

The invention relates to a polymer electrolyte, and especially relates to a biodegradable blend-type polymer electrolyte membrane and a preparation method thereof. The polymer electrolyte membrane comprises biodegradable polymer, non-biodegradable polymer and conductive lithium salts. The preparation method comprises the following steps: blending the biodegradable polymer and the non-biodegradable polymer according to a certain ratio to prepare a polymer electrolyte substrate membrane, soaking the polymer electrolyte substrate membrane in an electrolyte solution for activation so as to prepare the biodegradable blend-type polymer electrolyte membrane. The polymer electrolyte membrane prepared by the invention has good mechanical properties and conductivity, and has biodegradability. The preparation method of the invention has high efficiency, low cost, simple operations, and a wide application scope, and is applicable to industrial production.

Description

technical field [0001] The invention relates to polymer electrolytes, in particular to a biodegradable blended polymer electrolyte membrane and a preparation method thereof. Background technique [0002] Since Thomas Edison invented the rechargeable iron-nickel battery in 1890, after more than a century of development, the battery has spread all over every corner of people's production and life, ranging from aerospace, national defense and security, to household appliances and children's toys, everywhere. Looking at the battery figure. Batteries have become an integral part of people's lives. [0003] However, the emergence of batteries has brought great threats to the ecological environment. Whether it is the early nickel-cadmium battery, the later lead-acid battery, the later nickel-metal hydride battery or the still popular alkaline dry battery, without exception, if it is not managed, it will bring a huge disaster to the ecological environment. The heavy metal ions co...

AI Technical Summary

Problems solved by technology

[0005] However, although lithium batteries have made great breakthroughs in environmental protection, they still pose a certain threat to the ecological environment.

The lithium battery electrolyte still contains a small amount of heavy metal ions such as nickel and cobalt. If they are allowed to accumulate, they will definitely cause harm to the environment.

In recent years, polymer lithium-ion batteries with higher safety performance have developed rapidly. The main feature of this battery is that the electrolyte matrix of the battery is a solid polymer gel or dry film. Among them, the materials that constitute these solid electrolyte matrix are mainly It is polyethylene oxide, polyvinylidene fluoride, polyacrylonitrile, polymethyl methacrylate, etc., but these materials have a common fatal shortcoming: it is difficult to biodegrade

However, the high brittleness, low strength, and low thermal stability of pure polylactic acid make its film-forming performance poor, which determines that pure polylactic acid is difficult to become a solid electrolyte matrix material, and can only be achieved by modifying polylactic acid. The purpose of electrolyte matrix membrane material

[0007] Blending is a commonly used method to improve material performance in material research. This method can combine the advantages of two or more materials with certain compatibility in one material. Polylactic acid has good biodegradability performance, but the electrical conductivity is poor. Traditional electrolyte materials have good electrical conductivity but poor biodegradability. If biodegradable materials such as polylactic acid are blended with traditional electrolyte matrix membrane materials, they can be used as electrolyte matrix membranes. The purpose of the material can meet the requirement of biodegradable