Aqueous zinc ion battery

Abstract

The invention belongs to the technical field of batteries, and particularly relates to an aqueous zinc ion battery. The aqueous zinc ion battery comprises an anode, a cathode, an electrolyte and a diaphragm, wherein the diaphragm is arranged between the anode and the cathode; the cathode is a graphene-assisted zinc cathode; the electrolyte comprises a solvent and a solute, the solvent is water, and the solute comprises soluble zinc salt and manganese salt. Compared with the prior art, the aqueous zinc ion battery has the advantages that the graphene-assisted zinc cathode is applied to the aqueous zinc ion battery system; by adopting the graphene with excellent property and stable structure, the stability and conductivity of the zinc cathode are enhanced, so that the cycle property of the graphene-assisted zinc cathode is enhanced; especially, by adding the trace manganese salt and the corrosion inhibitor into the electrolyte, the problems of zinc corrosion, passivating and the like canbe effectively relieved; the cycle life of the graphene-assisted zinc cathode is further prolonged.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a water system zinc ion battery. Background technique [0002] As an efficient energy storage device, rechargeable batteries have been widely used in mobile communications, electronic equipment, electric vehicles and other fields. Existing rechargeable batteries, such as lithium-ion batteries, lead-acid batteries, and nickel-metal hydride batteries, all have problems such as poor safety, pollution, high cost, and inability to charge and discharge quickly. Rechargeable batteries that are safe, cheap, environmentally friendly and fast charge and discharge are the development direction of future batteries. The development of the next generation of batteries with higher energy density, faster charge and discharge speed, and stronger safety is the cornerstone of the future development of human life. [0003] Chinese patent (CN 101540417A) invented a zinc-ion battery, wh...

AI Technical Summary

Problems solved by technology

The reaction mechanism of this aqueous zinc-ion battery is based on the intercalation / extraction of zinc ions in the crystal structure of the electrode material, but because the radius of zinc ions is much larger than that of lithium ions and sodium ions, electrode materials are more likely to occur during the intercalation / extraction process. Structural collapse and thus short cycle life of aqueous Zn-ion batteries hinders their widespread application as rechargeable batteries

In addition, the zinc negative electrode has problems such as corrosion and passivation in the electrolyte, which seriously affects the reaction efficiency of zinc as the active material of the negative electrode.

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