Flexible three-dimensional layered MXene@indium composite film and preparation method and application thereof

Abstract

The invention discloses a flexible three-dimensional layered MXene@indium composite film and a preparation method and application thereof. The flexible composite film is prepared by depositing metal indium (In) with a low melting point onto a flexible self-supporting MXene film by a simple and industrial electrodeposition method, wherein indium can be subjected to alloying reaction with metal lithium, and indium has excellent lithium affinity, so nucleation barriers can be effectively reduced, the actual current density in the lithium deposition and dissolution process is reduced, the reduction of deposition dissolution overpotential is facilitated, the uniformity of deposition is improved, the preparation method is simple, the internal lithium ion transmission rate is increased, the lithium deposition direction can be changed, and the battery safety problem caused by the fact that the lithium dendrites pierce the diaphragm is relieved; the composite material has an excellent effect ofinhibiting the growth of the lithium dendrites, the electrodeposition operation is simple and convenient, and large-scale production can be realized, so that the preparation method has the great application value and scientific research value.

Description

technical field [0001] The invention belongs to the field of composite material preparation and lithium metal battery technology, and specifically relates to a flexible three-dimensional layered MXene@indium composite film and its preparation method and application. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] With the increasing demand for electric vehicles, large-scale energy storage, and light electric vehicles, the global non-renewable resources are decreasing. Based on the current urgent demand for green, efficient, and practical energy storage materials, high-performance The development of rechargeable and dischargeable batteries for secondary energy storage is i...

AI Technical Summary

Problems solved by technology

However, during the charging process of lithium metal secondary batteries, dendritic metal lithium, that is, metal lithium dendrites, is likely to form on the surface of the negative electrode during the repeated deposition and precipitation of lithium ions during reduction, and the sharp metal lithium dendrites are likely to pierce The diaphragm, thus contacting the positive electrode material of the battery will cause internal short circuit, and may even cause safety issues such as explosion; and the growth of a large number of metal lithium dendrites will lead to repeated damage to the SEI film, thereby continuously consuming the electrolyte and greatly shortening the use of the battery life; in addition, the formation of irreversible "dead lithium" will also reduce the capacity of lithium metal batteries

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