Zinc-nickel double-flow battery

Abstract

Disclosed is a zinc-nickel double-flow battery, wherein the battery comprises a single battery or an battery pile which is formed by connecting more than two single batteries in series, a positive electrode electrolyte storage tank, a negative electrode electrolyte storage tank, a positive and negative electrode circulating pipeline and a pump; the single battery comprises a positive electrode endplate, a positive electrode current collector, an electrode frame, an electrode frame, a positive electrode, a battery diaphragm, an electrode frame, a negative electrode, a negative electrode current collector and a negative electrode end plate which are stacked in sequence, wherein the positive electrode and the negative electrode are both flexible electrodes; and the positive electrode electrolyte and the negative electrode electrolyte are the same and are both alkaline aqueous solutions containing soluble zinc salt. The battery has the advantages of being simple in structure, high in energy density, high in power density, simple in processing and manufacturing process and the like.

Description

technical field [0001] The invention relates to the technical field of flow batteries, in particular to a zinc-nickel flow battery. technical background [0002] 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. [0003] 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 1.0M ZnO+0.5M LiOH+10M KOH aqueous solution, and the positive and negative electrodes are There is no diaphragm in between. Since the battery has no diaphragm, the battery cannot be connected in serie...

AI Technical Summary

Problems solved by technology

[0003] 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 1.0M ZnO+0.5M LiOH+10M KOH aqueous solution, and the positive and negative electrodes are 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 battery structure such as all-vanadium, zinc-bromine, etc., making it impossible for the battery to achieve 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

Images