▎ 摘　　要

NOVELTY - A composite positive electrode material comprises a complex of reduced graphene oxide and sodium-iron-nickel phosphate, and has loofah-like structure. USE - Composite positive electrode material for sodium ion battery. ADVANTAGE - The positive electrode material provides battery having high working voltage and cycle stability, and is prepared under mild reaction conditions by simple method. DETAILED DESCRIPTION - A composite positive electrode material comprises a complex of reduced graphene oxide and sodium-iron-nickel phosphate (Na2Fe1-xNixP2O7, where x is 0.05-1), and has loofah-like structure. An INDEPENDENT CLAIM is included for preparation of composite positive electrode material.