LITHIUM ANODE SURFACE MODIFICATION METHOD FOR LITHIUM METAL BATTERY AND LITHIUM METAL BATTERY

摘要

Disclosed are a lithium anode surface modification method for a lithium metal battery and a lithium metal battery. The modification method comprises the following steps: immersing, in a dry protective gas atmosphere, a lithium metal anode in a fluorine ion-containing liquid, or smearing a fluorine ion-containing liquid on a surface of the lithium metal anode; after fluorination and removal, a protective layer rich in lithium fluoride is formed on the surface of the lithium metal anode, and a lithium metal-coated lithium metal anode is obtained. The lithium fluoride protective layer obtained by the surface fluorination of the invention is highly uniform and dense, so as to reduce the consumption of lithium metal and electrolyte and inhibit the formation of lithium dendrite, such that the lithium metal anode has the advantages of higher discharge specific capacity, longer cycle life and better safety performance. The invention achieves stability and high efficiency of a lithium metal battery during long cycle processes, as well as the operational requirements of high energy and high power of a power battery, conducive to promotion of an industrialization process for lithium metal batteries and having broad application prospects.