Zinc-nickel double-fluid flow battery

Abstract

The invention relates to a zinc-nickel double-fluid flow battery. A single battery sequentially comprises a nickel electrode anode, a cation exchange membrane, an annular frame, an anion exchange membrane and a cathode that are superimposed in order. Both sides of the annular frame are respectively attached to the cation exchange membrane and the anion exchange membrane, two side opening ends of the annular frame are sealed by the cation exchange membrane and the anion exchange membrane, and the central cavity of the annular frame is enclosed into an electrolyte solution storage cavity. A third solution is loaded in the electrolyte solution storage cavity to conduct ions so as to form an ion conducting loop. Two different ion exchange diaphragms are used between the anode and cathode of the battery, by introducing the annular frame into the center, acidity and alkalinity of the electrolyte solutions at the anode and cathode are designed separately and independently, so that the anode electrolyte solution of the zinc-nickel fluid flow battery can use a low concentration alkali fluid, and the cathode electrolyte solution can use a zinc ion containing neutral aqueous solution, thus effectively solving the corrosion defect caused by the need of conventional nickel-zinc fluid flow batteries for a high concentration alkaline zincate aqueous solution.

Description

technical field [0001] The invention relates to a zinc-nickel flow battery, in particular to a zinc-nickel double-liquid flow battery. technical background [0002] The development and utilization of renewable energy such as solar energy, wind energy, and tidal energy cannot do without efficient 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 problems during the zinc deposit...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the corrosion pollution problem of the strong alkaline electrolyte of the zinc-nickel flow battery, a cation exchange membrane and an anion exchange membrane are respectively introduced between the positive and negative electrodes, so that the pH of the positive and negative electrolytes can be independently designed, and the positive side is alkaline. The concentration of electrolyte can be as low as 0.5mol L -1 , while the electrolyte on the negative side can use a neutral aqueous solution containing zinc ions

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