A Zn-Ni liquid battery

Abstract

The utility model relates to a zinc-nickel sap fluid cell, which comprises a galvanic pile which is a multi-section series connection of cell monomers, electrolyte, a storage tank, a liquid pump and a plurality of pipelines; wherein, the cell monomer comprises a nickel electrode anode, a cathode current collector of deposit zinc, and electrolyte; wherein, the electrolyte is a zincous alkaline solution, and two cell monomers are connected in series via a bipolar plate. In the process of charge and discharge, the electrolyte continuously flows between the storage tank and the galvanic pile via the pipelines driven by the liquid pump. Zinc settles onto the cathode current collector and becomes a cathode active substance from the electrolyte at the time of charging, while zinc dissolves into the electrolyte from the cathode current collector at the time of discharging. The utility model has the advantages of simple fabrication technology, low cost, high cycle life and other advantages.

Description

technical field [0001] The invention relates to the combination principle and preparation method of a novel battery, in particular to the principle and preparation of a zinc-nickel flow battery, which belongs to the field of chemical industry and can be widely used in the fields of electronics industry, transportation, electric power, mining and metallurgy. Background technique [0002] The existing alkaline zinc-nickel secondary batteries have high specific energy (55-85Wh / kg), high specific power (up to 200W / kg), high open-circuit voltage (1.75V), and wide operating temperature range (-20-60 ℃), can be charged with a large current, and has abundant raw materials, low cost, and will not pollute the environment. It also has the superior performance of the extremely high capacity of the zinc negative electrode in the zinc-silver electrode and the long life of the nickel positive electrode in the nickel-cadmium battery, so it is used as a power The power supply has a wide rang...

AI Technical Summary

Problems solved by technology

[0004] In the traditional zinc-nickel battery, the zinc electrode is rolled from zinc oxide (metal zinc powder), additives and polytetrafluoroethylene emulsion (70% porosity). When discharging, the zinc electrode generates zinc oxide and zinc hydroxide. These products A large amount of zinc is dissolved in strong alkaline electrolyte, and zincate has a high density and tends to sink; as the charge and discharge cycle proceeds, the upper part of the electrode is consumed and becomes thinner due to the loss of active materials; a large amount of zinc is deposited on the lower part of the electrode, and the active The substance becomes thicker and harder, which causes deformation of the electrodes, which reduces the effective area, reduces the discharge rate, and reduces the battery capacity

[0005] 2. Zinc dendrites

[0007] 3. Expansion and poisoning of nickel electrodes

Ion-exchange membranes are expensive and have low performance stability. Therefore, ion-exchange membranes are not only the determinants of the performance of flow batteries such as all-vanadium and ferrochromium, but also one of the determinants of the cost of these battery systems.

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