▎ 摘　　要

NOVELTY - An electrode composition comprises carbonaceous material consisting of graphene and reduced graphene oxide and sodium ions. USE - A composition for electrode used for battery e.g. coin cell batteries and cylindrical cell batteries (all claimed). ADVANTAGE - Composite electrode can exhibit stable charge capacity at - 15 degrees C. The battery has excellent cyclability of sodium ions without any appreciable degradation at 0.1-2.25 V for greater than or equal to 50 cycles at room temperature. The uniaxial tensile testing of composite papers demonstrates the exceptionally high fracture strength of the papers. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) electrode comprising the electrode composition; (2) battery comprising the electrode; (3) cycling method of sodium ions which involves providing composition comprising carbonaceous material e.g. graphene and reduced graphene oxide and a number of channels and introducing sodium ions into the channels; (4) preparation of exfoliated dichalcogenide which involves providing dichalcogenide to be exfoliated and contacting dichalcogenide with superacid; (5) formation of composition useful as an electrode which involves removing solids from suspension of graphene oxide and transition metal dichalcogenide to yield composite and heating composite to 300-900 degrees C for 100-140 minutes to yield heat-treated composite comprising reduced graphene oxide; (6) reduced graphene oxide electrode which has sodium capacity for greater than or equal to 40 cycles of greater than or equal to 110 mAh/g with respect to the weight of the electrode and at 100 mA/g; and (7) formation of high-sodium capacity, reduced graphene oxide electrode which involves heating composition comprising reduced graphene oxide at 450-550 degrees C for 60-180 minutes.