Flexible lithium metal battery negative electrode, preparation method thereof and lithium metal battery

Abstract

The invention discloses a flexible lithium metal battery negative electrode, which comprises a current collector, a lithium-philic substance and lithium metal, wherein the lithium-philic substance and the lithium metal are loaded on the current collector; the lithium-philic substance is a substance capable of reducing the nucleation barrier of the lithium. The substance capable of reducing the nucleation barrier of lithium is loaded on the current collector, so that on one hand, the nucleation barrier of lithium can be reduced, the uniform compounding of lithium metal and the current collector is realized, and on the other hand, as a rivet-like effect, the binding force of lithium metal and the current collector can be enhanced, and the preparation of the flexible lithium metal electrode is realized. The invention also provides a preparation method of the flexible lithium metal battery negative electrode. According to the method, the lithium-philic substance can play a role in inhibiting the growth of lithium dendrites and play a rivet role in the negative electrode of the flexible lithium metal battery. The invention also discloses a lithium metal battery. The lithium metal battery has the advantages of reduced hidden trouble of short circuit, improved coulombic efficiency and prolonged service life.

Description

technical field [0001] The invention relates to a lithium metal electrode, in particular to a flexible lithium metal battery negative electrode, a preparation method thereof, and a lithium metal battery. Background technique [0002] Lithium metal batteries have the potential of ultra-high energy density and are considered to be the ultimate goal in the development of secondary batteries. The development of flexible lithium metal batteries can not only provide a choice of high-performance secondary batteries for traditional electronic products such as mobile phones, computers, and electric vehicles, but also provide a basis for secondary batteries to be used in new wearable electronic products such as monitoring bracelets and smart watches. applications are possible. The key to the development of flexible lithium metal batteries lies in the design and preparation of high-performance flexible lithium metal anodes. At present, there are the following technical difficulties i...

AI Technical Summary

Problems solved by technology

[0004] Although the preparation of flexible lithium metal electrodes has been realized, the above-mentioned technical solutions have certain defects in improving the electrochemical performance of lithium metal negative electrodes: 1. The conductivity of the framework material It has a decisive impact on the deposition behavior of lithium metal. When the framework material is an insulating material, it will inevitably cause uneven distribution of current density in the electrode, which will make the growth of lithium dendrites more serious; 2. The improvement of the electrochemical performance of lithium negative electrodes Relying on the regulation of current density, nucleation barrier, etc., and the framework material selected in the above patent is a single substance, it is difficult to achieve multifunctionality

In addition, the above-mentioned technical solution uses thermal fusion to realize the compounding of metal lithium and the skeleton material. Although the operation is simple, it relies on the solidification of liquid lithium or gaseous lithium, and the process controllability is poor, and it is difficult to obtain a smooth surface. Uniform lithium metal anode

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