Manufacturing method of flexible three-dimensional metal lithium negative electrode material

Abstract

The invention provides a manufacturing method of a flexible three-dimensional metal lithium negative electrode material. A three-dimensional carbon cloth material is used as a substrate of a flexibleelectrode, a layer of silicon nanowire grows on a surface of three-dimensional carbon cloth, wettability of a carbon cloth three-dimensional substrate to molten metal lithium is effectively improved by means of an alloying reaction between the silicon nanowire and the molten metal lithium, and a problem of ' 'lithium dredging' ' of a conventional three-dimensional skeleton is solved. Besides, a contact area of the three-dimensional skeleton with molten lithium is increased through a nano-sized silicon wire interlaced structure, a loading capacity of metal lithium in the skeleton is improved, and nucleation and growth of lithium dendrites are avoided.

Description

technical field [0001] The invention belongs to the technical field of negative electrodes of battery energy storage systems, and in particular relates to a preparation method of a flexible three-dimensional metal lithium negative electrode material. Background technique [0002] Currently, rechargeable batteries play an important role in electronic devices such as mobile phones, laptops, and smart watches. With the increasing demand for high capacity and flexibility of portable batteries, the development of flexible batteries with higher energy density has gradually become a key scientific issue in the development of current energy storage battery technology. Among them, lithium-ion batteries, lithium-sulfur batteries, and lithium-air batteries are considered to be the most promising future battery systems because the lithium metal anodes they use have the highest theoretical specific capacity (3860mAh / g) and the lowest battery capacity. Chemical potential (-3.04Vvs standa...

AI Technical Summary

Problems solved by technology

[0003] However, the metal lithium anodes of the prior art have the following defects: 1) poor flexibility, which seriously restricts the development of high-capacity flexible battery systems; 2) the wettability of the foamed nickel framework to molten lithium metal is poor, and these metal substrates are usually "Lithophobic" ones can only adsorb a small amount of metal lithium during the electrode preparation process, and tend to be adsorbed on the surface of the metal skeleton; when the battery is bent, metal lithium is easily detached from the substrate, which has poor performance. Flexibility and longevity

3) The side effects between lithium metal and electrolyte components, as well as the inhomogeneity of lithium in the deposition and dissolution process, can easily lead to low Coulombic efficiency and dendrite growth, affecting battery life and endangering battery safety

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