▎ 摘　　要

NOVELTY - Preparation of reduced graphene oxide-lithium-lanthanum-zirconium-tantalum oxide-lithium composite lithium powder negative electrode system involves uniformly mixing graphene oxide and lithium-lanthanum-zirconium-tantalum oxide, performing high-temperature thermal reduction under inert atmosphere to obtain reduced graphene oxide-lithium-lanthanum-zirconium-tantalum oxide, uniformly mixing reduced graphene oxide-lithium-lanthanum-zirconium-tantalum oxide with lithium powder, and performing powder-pressing process. USE - Preparation of reduced graphene oxide-lithium-lanthanum-zirconium-tantalum oxide-lithium composite lithium powder negative electrode system used for assembling lithium battery e.g. lithium/lithium battery and lithium//copper battery (all claimed). ADVANTAGE - The method enables preparation of negative electrode system with excellent electrochemical performance. The lithium-lanthanum-zirconium-tantalum oxide is easily and uniformly dispersed in the lithium metal negative electrode, which improves Columbic efficiency and cycle stability of the lithium metal negative electrode. DETAILED DESCRIPTION - Preparation of reduced graphene oxide-lithium-lanthanum-zirconium-tantalum oxide-lithium composite lithium powder negative electrode system involves uniformly mixing graphene oxide and lithium-lanthanum-zirconium-tantalum oxide (Li7-xLa3Zr2-xTaxO12, where x is 0.1-0.6), performing high-temperature thermal reduction under inert atmosphere to obtain reduced graphene oxide-lithium-lanthanum-zirconium-tantalum oxide, uniformly mixing the reduced graphene oxide-lithium-lanthanum-zirconium-tantalum oxide with lithium powder, and performing powder-pressing process. INDEPENDENT CLAIMS are included for the following: 1. application of the reduced graphene oxide-lithium-lanthanum-zirconium-tantalum oxide-lithium composite lithium powder negative electrode system, which involves uniformly dispersing the reduced graphene oxide-lithium-lanthanum-zirconium-tantalum oxide and lithium powder in an organic solvent to obtain slurry, and coating the slurry on a copper foil negative electrode collector; and 2. a lithium battery, which is assembled using the negative electrode system.