Fast-charging lithium air battery with self-catalytic activity

Abstract

The invention relates to a fast-charging lithium air battery with self-catalytic activity, which comprises a positive electrode, a diaphragm, an electrolyte and a negative electrode, wherein a transition metal doped discharge product in a nanosheet array form is grown on the positive electrode in situ, the chemical formula expression of the transition metal doped discharge product is MxLiyO2, M is transition metal, x is more than 0 and less than or equal to 0.1, y is more than or equal to 0.90 and less than 1.00, the electrolyte is obtained by dissolving a lithium salt in an ether organic solvent, and the ether organic solvent comprises a fluorine-containing ether compound. The overpotential in the charge-discharge process is greatly reduced by the discharge product with self-catalytic activity, and the stability of battery operation is greatly improved. The lithium air battery with the self-catalytic performance is simple to prepare, a substance with catalytic activity is transition metal doped lithium peroxide generated in the charging and discharging process of the battery, independent preparation is not needed, the preparation can be completed by adopting commercialized low-cost raw materials, and the lithium air battery has industrial advantages.

Description

technical field [0001] The invention belongs to the field of lithium-air batteries, in particular to a fast-charging lithium-air battery with self-catalytic activity. Background technique [0002] Since the beginning of the 21st century, modern society has developed rapidly, and human demand for energy is increasing day by day. The extensive use of traditional fossil energy has led to many environmental problems, such as the greenhouse effect and smog. Therefore, energy issues have received extensive attention, and a research boom has been set off worldwide. The development and effective utilization of new green energy has increasingly become the current research focus and hotspot. Cars and light trucks reportedly consume up to 34 percent of fossil energy and are one of the major sources of air pollutants. The modern automobile industry has gradually developed towards clean energy pure electric vehicles, hybrid vehicles and other new energy vehicles. The necessary conditi...

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Problems solved by technology

[0008] Based on the problems of high cost, complex preparation, insufficient stability, poor cycle performance, and low energy efficiency in the prior art for metal-air battery cathode catalysts, the present invention uses the electrolyte dissolved in transition metal salts as the electrolytic solution for self-catalyzed metal-air batteries. Liquid, in a certain atmosphere, through in-situ electrochemical introduction of transition metals such as Zn, Ni, Co, Mn, Fe, etc., especially cobalt, to generate doped peroxides. Using this electrochemical reaction, you can Synthesize many catalysts with harsh synthesis conditions and apply them directly as cathode catalysts to lithium-air batteries

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