Flexible lithium metal cell negative pole and preparation method thereof

Abstract

The invention discloses a flexible lithium metal cell negative pole and a preparation method thereof, and belongs to the technical field of lithium metal cells. The flexible lithium metal cell negative pole is prepared from two-phase structures of lithium metal and a framework material, wherein the content of the lithium metal is 10-99.9wt.%, and the framework material is a conductive material or an insulating material; the flexible lithium metal cell negative pole can be bent within 0-180 degrees, and the losses of electrochemical performance in the bending process is 0.001-50%. Solid metal lithium is melt into liquid or gasified into gas, and then the liquid or the gas is mixed with the framework material, so that the flexible lithium metal cell negative pole is prepared. Compared with a lithium sheet negative pole, the lithium metal cell negative pole effectively improves the mechanical property of lithium metal negative poles, restrains dendritic growth and alleviates the volume swelling of an electrode in the lithium removing and inlaying process; if a flexible positive pole is matched with the negative pole to obtain flexible cells, realization of the business application to flexible wearable electronic equipment with high energy density can be facilitated.

Description

technical field [0001] The invention belongs to the technical field of lithium metal batteries, and in particular relates to a flexible lithium metal battery negative electrode and a preparation method thereof. Background technique [0002] The successful commercial use of lithium-ion batteries has brought about the rapid development of portable electronic devices. As the demand for wearable electronics increases, the demand for flexible high-energy-density battery systems is more urgent. Among the known electrode materials, the lithium metal negative electrode is 3860mAh·g -1 The high capacity and the most negative potential (-3.040Vvs. standard hydrogen electrode) have become the "holy grail" in the energy storage industry and have attracted the attention of researchers. The battery energy storage system with metal lithium as the negative electrode and materials such as sulfur and oxygen as the positive electrode has a high theoretical energy density (lithium-sulfur batt...

AI Technical Summary

Problems solved by technology

[0004] The above research results have proposed many ideas for inhibiting dendrite growth, but there has been no good solution to the volume expansion problem of lithium metal anodes.

However, lithium-aluminum alloys still cannot completely solve the volume expansion problem of lithium metal negative electrodes, and are eventually replaced by lithium-ion batteries with graphite as negative electrodes.