▎ 摘　　要

NOVELTY - Preparing stannic oxide (SnO2)-graphene nanocomposite containing oxygen vacancy defects comprises (i) adding aqueous solution of graphene oxide to stannic chloride (SnCl4) solution slowly and shaking in an ultrasonic washing bath at 25 degrees C for 15-30 minutes to obtain yellow-brown transparent clear solution; (ii) packaging solution obtained in step (i) in 50 ml hydrothermal reaction kettle and heating to 140-160 degrees C for 16-24 hours; (iii) centrifuging solution after the step (ii), discarding supernatant liquid and placing resulting precipitate in an oven and vacuum drying at 50-80 degrees C for 12-16 hours; and (iv) placing dry powder obtained in step (iii) in atmosphere protection tube furnace, tempering at 400-600 degrees C and introducing reducing gas, controlling gas flow rate at 50-800 ml/minutes for 3-5 hours, where reducing gas introduced is 3-8 vol.% hydrogen/argon of H2 mixed gas. USE - The SnO2-graphene nanocomposite containing oxygen vacancy defects is useful for cathode of normal temperature sodium ion battery (claimed). ADVANTAGE - The SnO2-graphene nanocomposite containing oxygen vacancy defects exhibits good rate performance and circulation stability when used in cathode of a sodium ion battery. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for use method of SnO2-graphene nanocomposite containing oxygen vacancy defects, comprising mixing with Super P carbon black and polyvinylidene fluoride at a ratio of 75:15:10 wt.%, forming paste with N-methyl-2-pyrrolidone (NMP) solvent, coating on the surface of the copper foil, vacuum drying, cutting coated copper foil into disk having a diameter of 15 mm as sodium ion battery electrode, where electrolyte for sodium ion batteries (EC: PC = 1:1, NaClO4 concentration of 1 mol/l) and metal sodium foil are used as counter electrode.