▎ 摘　　要

NOVELTY - A three-dimensional composite lithium metal negative electrode with multifunction interface layer comprises a three-dimensional conductive substrate, a multifunction lithium of the interface layer and a load. The multifunction interfaces layer comprises lithium tin alloy and lithium fluoride. USE - Three-dimensional composite lithium metal negative electrode with multifunctional interface layer for lithium metal battery used in electric bicycles and electric automobiles. ADVANTAGE - The three-dimensional composite lithium metal negative electrode has high ion conductivity and stable with respect to the electrolyte solution of the modified layer, controls the uniform deposition of lithium and inhibits the volume expansion of the metal lithium negative electrode during the charging and discharging process, exhibits a lower lithium deposition over-potential and stable electrochemical cycle performance, and prolongs the service life. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the preparation of composite lithium metal multifunction negative electrode which involves (s1) preparing a stannous fluoride solution by heating and dissolving stannous fluoride in a polar solvent, (s2) adding the prepared solution into the three-dimensional conductive substrate for soaking treatment, cooling, taking out the soaked substrate and drying to obtain a stannous fluoride-loaded three-dimensional conductive substrate, (s3) carrying out high-temperature fused lithium deposition on the obtained substrate loaded with stannous fluoride in a protective atmosphere, pouring fused lithium into a three-dimensional conductive frame and cooling.