Zinc ion battery

Abstract

The invention discloses a zinc ion battery, and the battery comprises a positive electrode, a negative electrode and an electrolyte; the positive electrode comprises an alpha-MnO2 / carbon nanotube composite material, the negative electrode comprises a zinc / carbon nanotube foam composite material, and the electrolyte comprises a soluble zinc salt and a soluble manganese salt. According to the zinc ion battery provided by the embodiment of the invention, the alpha-MnO2 / carbon nanotube composite material is used as the positive electrode, and the zinc / carbon nanotube foam composite material is used as the negative electrode, so the problem of dendritic crystal growth of the traditional zinc negative electrode in the cycle process is solved, the cycle life of the battery is greatly prolonged, and the stability of the battery is greatly improved; and the zinc ion battery provided by the embodiment of the invention can maintain higher specific capacity under high magnification, so the cycle life of the battery is greatly prolonged, and long cycle under high magnification is realized.

Description

technical field [0001] The invention relates to a zinc ion battery, in particular to an aqueous zinc ion battery with high rate and long cycle life, and belongs to the technical field of nanometer materials. Background technique [0002] The problem of energy and environmental pollution is a serious problem in the development of modern society. The depletion of traditional petroleum, coal and other fossil resources and serious environmental pollution all require the development of green and efficient new energy sources; among them, the two under the water-based system Secondary batteries have attracted much attention, especially the aqueous zinc-ion batteries proposed in recent years. [0003] Zinc-ion batteries are evolved from traditional alkaline zinc-manganese batteries, which are primary batteries and cannot be used repeatedly. Alkaline electrolytes are not easy to recycle, are highly corrosive, and leak and pollute the environment; based on this system, a secondary alk...

AI Technical Summary

Problems solved by technology

[0006] However, the existing water-based zinc-ion batteries have the following disadvantages: due to the phenomenon of short circuit and stripping inactivation caused by the dendrite growth of the zinc negative electrode during the cycle, the cycle life and stability are greatly reduced; under certain conditions of the positive electrode, The traditional zinc flake negative electrode suffers from severe capacity fading during high-rate charge and discharge, and the zinc flake has serious hydrogen evolution under high-current conditions, and its two-dimensional planar structure has large charge transfer and ion diffusion resistance, poor kinetic performance, and cannot be matched at high rates. The positive electrode leads to serious capacity fading; and, due to the introduction of the zinc sheet’s own mass, its energy density is not high, and the capacity fading at high rates leads to its low power density

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