Composite lithium metal negative electrode material, preparation method thereof and metal lithium battery

Abstract

The invention provides a composite lithium metal negative electrode material. The composite lithium metal negative electrode material comprises a framework material, and Li3N, LiNOx and metal lithium which are compounded with the framework material, the framework material comprises one or more of a carbon nano tube, carbon cloth, a three-dimensional porous copper film, a three-dimensional porous aluminum film and a carbon nano tube film. A framework material, nitrate and molten metal lithium are mixed, the framework material, lithium nitride, nitrogen oxide and the like are generated through an in-situ chemical reaction, a CNT / Li3N / LiNOx / lithium dual-ion electronic conductive network is provided, and the composite lithium negative electrode with stable interface, high ionic conductivity and high electronic conductivity dual conductive network is obtained; meanwhile, the formation of interface holes in the battery circulation process can be inhibited, and the long circulation stability of the solid-state battery is realized. The invention also provides a preparation method of the composite lithium metal negative electrode material and a metal lithium battery.

Description

technical field [0001] The invention belongs to the technical field of metal lithium batteries, and in particular relates to a composite lithium metal negative electrode material, a preparation method thereof and a metal lithium battery. Background technique [0002] The lithium metal anode has a high specific capacity (3680mAh g -1 ), low electrode potential (-3.04V vs standard hydrogen electrode) and low density (0.59g cm -3 ) and other characteristics, inorganic solid-state electrolytes (LLZO) have the advantages of high ionic conductivity, wide electrochemical window, high thermal stability, high mechanical strength and chemical stability to lithium metal, so solid-state lithium metal batteries have become the research focus of next-generation lithium batteries. one. [0003] However, the most critical problem is that the inorganic ceramic solid electrolyte will chemically react with the air to generate lithium carbonate, and the lithium carbonate will cover the surfac...

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Problems solved by technology

[0003] But the most critical problem is that the inorganic ceramic solid electrolyte will chemically react with air to form lithium carbonate, which will cover the surface of the solid electrolyte, resulting in poor wettability between LLZO and lithium.

Although these methods can improve the interfacial contact between the solid electrolyte and the lithium anode and reduce the interfacial impedance, however, these modification strategies are relatively strict, and there are still many limitations for practical applications, such as the high temperature or corrosive environment required to remove the impurity layer. and the expensive equipment needed to deposit the lithium-philic layer, etc.

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