Zinc-nickel single-redox-flow battery

Abstract

The invention relates to a zinc-nickel single-redox-flow battery. The zinc-nickel single-redox-flow battery comprises a single battery or an electric pile of more than two single batteries in series,an anode electrolyte storage tank, an anode circulation pipe conduit, and a pump; the single battery comprises a cathode end plate, a cathode current collector, a cathode placed in a cathode electrodeframe, a battery diaphragm, an anode placed in an anode electrode frame, an anode current collector, and an anode end plate which are successively overlapped from bottom to top, an anode electrolytein the anode electrolyte storage tank flows through the anode through the pump, and cathode electrolyte does not flow and is sealed in a closed chamber surrounded by the cathode current collector, thecathode electrode frame, the cathode and the battery septum, wherein the cathode and the anode are flexible electrodes, the cathode electrolyte and the anode electrode are the same, and are both alkaline aqueous solutions containing soluble zinc salt. The zinc-nickel single-redox-flow battery has the advantages of simple structure, high energy density, high power density, good safety and the like.

Description

technical field [0001] The invention relates to the technical field of liquid flow battery energy storage, in particular to the field of a zinc-nickel flow battery. technical background [0002] Zinc-nickel single flow battery is a new type of low-cost, high-efficiency, and environment-friendly flow battery energy storage technology. It has the advantages of high energy density and current efficiency, simple and easy-to-operate device, long service life, and low cost. It is mainly used in power grid peak shaving, renewable energy power generation such as wind energy and solar energy, electric vehicles and other fields. [0003] The traditional zinc-nickel single-flow battery is a sintered nickel oxide electrode on the positive electrode, and a deposited zinc electrode on nickel foil on the negative electrode. The electrolyte is 1.0M ZnO+0.5M LiOH+10M KOH aqueous solution, and there is no separator between the positive and negative electrodes. Since the battery has no diaphr...

AI Technical Summary

Problems solved by technology

Since the battery has no diaphragm, the battery cannot be connected in series with multiple cells. In the same flowing electrolyte without physical barriers and conduction, the cells can only be connected in parallel; because the traditional zinc-nickel single The positive electrode material of the flow battery has poor conductivity, and the current cannot be conducted from the thickness direction of the electrode, so it cannot be operated with a double battery structure such as all-vanadium, zinc-bromine, etc., making it impossible for the battery to realize multi-cell series connection

Traditional zinc-nickel single-flow batteries are limited by negative electrode materials (metals with low hydrogen evolution overpotential and insoluble in alkali), the probability of side reactions at the negative electrode is greatly increased (hydrogen evolution), and when the battery is left standing for a long time, the negative electrode will generate The simple substance of zinc will dissolve into the electrolyte again, so that when the battery is turned on again, the negative electrode does not have a hydrogen evolution side reaction due to the lack of zinc metal with a high hydrogen evolution overpotential, and the generation of hydrogen gas during use increases the danger of the battery

Limited by the overall structure of the battery, the capacity of the positive electrode of the traditional zinc-nickel single-flow battery is too low, resulting in limited battery capacity

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