Preparation method of surface coating modified lithium battery metal lithium negative electrode

Abstract

The invention relates to a preparation method of a surface coating modified lithium battery metal lithium negative electrode. The method comprises the steps of putting a metal lithium plate into a closed reaction container, and introducing nitrogen in an argon atmosphere environment to react for a certain time so as to obtain a surface-modified lithium metal plate; carrying out surface polishing treatment on a solid electrolyte ceramic plate; and enabling the surface-modified lithium metal plate and the solid electrolyte ceramic plate to be tightly attached together and then carrying out packaging treatment. The method has relatively good repeatability; the interface resistance can be better reduced and can be stabilized in a range of 0-20 ohm.cm<2>; compared with the interface resistanceof 34-100 ohm.cm<2> in the prior art, the problem of the interface resistance can be fundamentally solved; the preparation process is simple and easy to control; the metal lithium battery lithium metal negative electrode can be massively produced, and no large-scale deposition instrument is needed; and the surface of lithium is treated, so that the binding property of an in-situ growth substance and the lithium is particularly strong, and the reliability of a product is further improved.

Description

technical field [0001] The invention relates to the technical field of battery lithium metal negative electrode treatment, in particular to a method for preparing a surface-coated and modified lithium metal lithium negative electrode of a lithium battery. Background technique [0002] Lithium-ion battery is a new type of battery developed on the basis of lithium batteries. It mainly relies on the movement of lithium ions between the positive and negative electrodes to work. Its chemical properties mainly depend on the electrode materials. Devices are used in all aspects of life, but because of the bottleneck of energy density and safety issues, people are researching various new batteries, including lithium metal batteries, lithium-sulfur batteries and lithium-air batteries. The above batteries also have their own problems, such as lithium metal batteries are prone to lithium dendrites, which will cause serious safety problems, lithium-sulfur batteries, sulfur electrodes wil...

AI Technical Summary

Problems solved by technology

However, in the contact interface between the solid electrolyte and the electrode, a very large interface resistance is generated. In the conventional inorganic solid electrolyte, taking LLZTO as an example, 10 2 、10 3 、10 4 Even higher order of magnitude interface resistance (unit: Ω cm 2 ), thus hindering the large-scale application of solid electrolytes

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