▎ 摘　　要

NOVELTY - Lithium ion battery composite negative electrode material is magnesium-graphite intercalation compound (Mg-GIC), which comprises magnesium nanoparticles which are dispersed between graphite layers, and graphite is not exfoliated into graphene or multilayer graphene, and still retains three-dimensional layered structure intact. USE - Lithium ion battery composite negative electrode material. ADVANTAGE - The lithium ion battery composite negative electrode material enables to provide high specific capacity and long cycle stability; has unique characteristics; increases active sites of graphite, increases lithium storage capacity of graphite, and broaden lithium insertion potential of graphite; where Vander Waals force between graphite layers ensures reversible expansion and contraction of Mg-GIC, and maintains stability of structure; provides magnesium with excellent conductive network and fast ion channels, and improves rate performance of magnesium.