▎ 摘　　要

NOVELTY - A negative electrode material of lithium ion battery preparing method involves ultrasonic mixing a graphene powder with water, adding an iron source precursor and ultrasonically mixing to make iron (3+) self-assemble and attaching on both sides of the graphene sheet layer, adding graphene powder again to mix, adding the graphene again is self-assembled, after the centrifugal dehydration treatment, heat-treating the material to obtain the finished product. USE - Method for preparing negative electrode material of lithium ion battery for use in lithium ion battery negative electrode pole piece (claimed). ADVANTAGE - The method enables preparing negative electrode material of lithium ion battery with improved specific capacity and cycle life, and enhanced conductivity. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following: (1) a method for preparing negative electrode material of lithium ion battery (2) a lithium ion battery negative electrode pole piece, comprises a composite material layer, where the composite material layer is utilized negative electrode material of lithium ion battery (3) a buckle type battery.