Zinc-nickel/air hybrid flow battery system

Abstract

The invention discloses a zinc-nickel / air hybrid flow battery system and relates to an energy storage technology of a flow battery. The zinc-nickel / air hybrid flow battery system comprises single batteries or a battery module formed by two or more single batteries, a liquid storage tank, a circulating pump and a pipeline, wherein each single battery comprises a positive electrode, a frame and a negative electrode; a composite electrode of a bivalent nickel compound layer and an oxygen reduction layer is adopted by each positive electrode; an electrolyte is an alkaline zincate water solution and is transferred into each frame when charged; an active material bivalent nickel on each positive electrode is oxidized into trivalent nickel and oxygen evolution reaction is carried out; and zinc ions in the electrolyte are deposited on each negative electrode in a form of a zinc element. The trivalent nickel on each positive electrode is reduced into bivalent oxide or hydroxide of nickel when discharged, and then subjected to oxygen reduction reaction; and the zinc element on each negative electrode is oxidized into the zinc ions to return to the liquid storage tank. According to the flow battery, the problems of incomplete zinc discharge and poor stability caused by the damage of the oxygen evolution reaction to a carbon-based electrode are solved, the energy density of the battery isimproved and the system of an application system of the flow battery is expanded.

Description

technical field [0001] The invention relates to a flow battery energy storage technology, in particular to a zinc-nickel / air hybrid flow battery system. technical background [0002] The development and utilization of renewable energy such as solar energy, wind energy and tidal energy cannot do without efficient and large-scale energy storage equipment. Among many energy storage devices, flow batteries have become one of the most promising energy storage devices due to their low cost, high efficiency, long life, and no geographical constraints. Patent CN101127393A invents a zinc-nickel flow battery, which uses nickel hydroxide or nickelous oxide as the positive electrode, deposited zinc as the negative electrode, and strongly alkaline zincate aqueous solution as the electrolyte, and the flowing electrolyte improves material transfer The process slows down the concentration polarization during the zinc deposition process, and effectively improves the dendrite and deformation...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of incomplete discharge of zinc and poor stability of carbon-based electrode caused by oxygen evolution reaction, the positive electrode adopts divalent nickel compound and oxygen reduction composite electrode. The oxidation-reduction reaction not only solves the problem of poor stability caused by incomplete zinc discharge and oxygen evolution reaction damage to carbon-based electrodes, but also increases the energy density of the battery and broadens the system of flow battery application systems

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