▎ 摘　　要

NOVELTY - Magnetic nanoparticles comprises a core containing silver; and a shell containing triiron tetraoxide surrounding all or part of the core. USE - The magnetic nanoparticle is useful for lithium-ion battery anode materials (claimed). ADVANTAGE - The magnetic nanoparticle provides anode material having excellent electrical conductivity, specific surface area capacity, and cycle stability, and increases efficiency of lithium-ion battery. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) lithium-ion battery anode material comprising magnetic nanoparticles, a carbon-based material, and a binder; and (2) producing magnetic nanoparticles comprising (a) preparing reaction solution by adding silver precursor to solution containing iron precursor, organic alkali metal salt, and organic solvent, and (b) heating the reaction solution at 180-250 degrees C for 10-30 hours.