Zinc-bromine flow battery electrolyte, zinc-bromine flow battery and application

Abstract

The invention relates to the technical field of zinc-bromine flow battery preparation, in particular to zinc-bromine flow battery electrolyte, a zinc-bromine flow battery and application, and the zinc-bromine flow battery electrolyte comprises water, zinc bromide, supporting electrolyte and 1-propyl-3-methylimidazolium bromide; wherein in the electrolyte of the zinc-bromine flow battery, the concentration of the 1-propyl-3-methylimidazolium bromide is 0.2 mol / L to 2 mol / L. And in the aspect of a negative electrode, the 1-propyl-3-methylimidazolium bromide can regulate and control the solvation structure of Zn < 2 + >, so that the uniformity of zinc deposition is effectively improved, and the formation of zinc dendrites is inhibited. Meanwhile, in the aspect of a positive electrode, a 1-propyl-3-methylimidazolium bromide type complex is formed between imidazole cations and Br2 molecules, and free bromine is immobilized through pi-pi bond interaction and hydrogen-bond interaction, so that the concentration of Br3 <-> in the electrolyte is improved; therefore, the problems of dendritic crystal growth of a zinc negative electrode of the zinc-bromine flow battery and high activity and volatility of a positive electrode bromine elementary substance are solved.