▎ 摘　　要

NOVELTY - Flexible self-supporting electrode material i.e. two dimensional sheet structure titanium carbide-reduced graphene oxide flexible film composite material with sodium ion intercalation ability, is new. USE - The composite material is useful for sodium ion battery (claimed), and in the field of energy storage for bendable electronic products. ADVANTAGE - The material is economical and environmental friendly, has high mass energy density and long life cycle, and simplifies the battery assembly process. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing the preparing the flexible self-supporting electrode material; and (2) preparing the sodium ion battery, comprising taking the obtained titanium carbide reduced graphene oxide flexible film composite as active material, cutting into moderate size as a electrode material, taking sodium sheet as counter electrode and the glass fiber membrane(GF/D whatman) as membrane, dissolving 1 mol/l of sodium perchlorate in propylene carbonate (PC) as electrolyte.