▎ 摘　　要

NOVELTY - Method for preparing ultra-thin porous bismuth oxide nano-sheet loaded graphene composite material, involves (a) dissolving bismuth salt in dilute hydrochloric acid, adding cetyltrimethylammonium bromide and carbonate, uniformly mixing, hydrothermally reacting, calcining the hydrothermal product at a high temperature to obtain an ultra-thin bismuth oxide nanosheet material, and (b) adding the material and oxalic acid to a dispersed graphene suspension, uniformly mixing and hydrothermally reacting to obtain a bismuth oxide/graphene composite nanomaterial. USE - The method is useful for preparing ultra-thin porous bismuth oxide nano-sheet loaded graphene composite material a lithium ion battery as negative electrode (claimed). ADVANTAGE - The composite material has high specific surface area, capacity and cycle stability, and is prepared by simple preparation process and cost-effective. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a lithium ion battery negative electrode, which is prepared by using the composite material as an active material.