Electrochemical synthesizing electric active polyaniline unded higher pH condition, and application

Abstract

This invention relates to an electrochemical method for synthesizing electrically active polyaniline at high pH value. The method comprises: adding electrolyte into an electrolysis pool, and electrolyzing under an electrode potential of 0.8-1.5 V vs. SCE. The electrolyte is a mixed solution of aniline 0.1-0.6 mol/dm3, ionic liquid 1-methyl-3-ethylimazole ethyl sulfate 1.0-1.5 mol/dm3, and sulfuric acid 1.7-2.5 mol/dm3. The polyaniline has the same good properties as that synthesized in HCl or H2SO4, and can retain good electrochemical activity in electrolyte at pH less than 12. The polyaniline can be used in zinc-polyaniline secondary battery, whose Conlomb density and energy density at different charge/discharge current density are higher than those of zinc-polyaniline secondary battery with polyaniline synthesized in HCl or H2SO4.

Description

technical field [0001] The invention relates to the technical field of electrochemical synthesis of polyaniline and the technology of applying it to a zinc-polyaniline secondary battery. Background technique [0002] For a long time, polyaniline has been one of the most widely studied and applied conductive polymer materials. It has the advantages of high electrical conductivity, good redox reversibility, and environmental stability. The application of polyaniline in plastic batteries, electrocatalytic reactions, chemical biosensors, light-emitting diodes, metal anticorrosion, antistatic, electromagnetic shielding and other fields has received extensive attention. In order to reduce the corrosion of zinc flakes under low pH conditions, the pH of the electrolyte in secondary polyaniline batteries should be raised as much as possible. However, a large number of experiments have proved that polyaniline synthesized from inorganic acids such as hydrochloric acid and sulfuric ac...

AI Technical Summary

Problems solved by technology

However, a large number of experiments have proved that polyaniline synthesized from inorganic acids such as hydrochloric acid and sulfuric acid has almost no electrochemical activity in electrolytes with pH>4.0.

This limits the application of polyaniline in aqueous secondary batteries

Many researchers have improved the electrochemical activity of polyaniline at high pH by self-doping, but the polyaniline prepared in this way is generally soluble in water.

There are also many researchers using polyaniline complexes to improve their electrochemical activity at high pH, ​​but this complex is prone to phase separation with changes in conditions.

Therefore, polyaniline made by these two methods is not suitable for secondary batteries