A zinc-nickel flow battery

Abstract

The invention relates to a zinc-nickel dual-flow battery, which comprises a single battery or a battery stack formed by connecting two or more single batteries in series, an electrolyte storage tank filled with electrolyte, a circulation pipeline, and a pump; The electrolyte in the storage tank flows through the positive electrode through the circulation pipeline through the pump, flows out from the positive electrode and flows into the negative electrode through the circulation pipeline, and finally flows back from the negative electrode to the electrolyte storage tank through the circulation pipeline; the positive electrode is based on carbon felt 1. A positive electrode active material is coated on the side close to the current collector. The positive electrode active material is composed of nickel hydroxide; the negative electrode is a flexible electrode. The battery has the advantages of simple structure, high energy density, high power density, and simple processing and manufacturing process.

Description

technical field [0001] The invention relates to the technical field of flow batteries, in particular to a zinc-nickel flow battery. [0002] technical background [0003] Zinc-nickel flow battery is a new type of low-cost, high-efficiency, and environment-friendly flow battery. 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 grids Peak shaving, wind energy and solar energy and other renewable energy power generation, electric vehicles and other fields. [0004] Disadvantages of traditional zinc-nickel single flow battery: 1. The positive electrode is a sintered nickel oxide electrode, the negative electrode is a deposited zinc electrode on nickel foil, the electrolyte is an alkaline aqueous solution of ZnO+LiOH+KOH, and there is no diaphragm. Since the battery has no diaphragm, the battery cannot be connected in series with multiple cells. In the same flowing ...

AI Technical Summary

Problems solved by technology

[0004] Disadvantages of traditional zinc-nickel single flow battery: 1. The positive electrode is a sintered nickel oxide electrode, the negative electrode is a deposited zinc electrode on nickel foil, the electrolyte is an alkaline aqueous solution of ZnO+LiOH+KOH, and there is no diaphragm

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. 2. Because the traditional zinc-nickel The positive electrode material of a single 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 dual flow battery structure such as all-vanadium, zinc-bromine, etc., making it impossible for the battery to realize multi-cell series connection

3. 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 zinc element generated by the negative electrode 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 absence of zinc metal with a high hydrogen evolution overpotential, and the generation of hydrogen gas during use increases the danger of the battery

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

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