▎ 摘　　要

NOVELTY - Preparing nano-sheet cathode material of sodium ion battery involves mixing potassium salt, titanium oxide and niobium oxide uniformly, calcining in an inert atmosphere to obtain layered potassium titanium nitride, carrying out acidification treatment, obtaining a layered tetrabutyl ammonium hydroxide by ion exchange. The layered tetrahydro-nitro-tetramethylhydroxide and aqueous solution of tetramethyl ammonium hydroxide is mixed uniformly. The liquid phase is exfoliated to obtain electro negative titanium nitroxide nanosheet dispersion. The electro positive graphene suspension is added to electro negative titanium nitroxide nanosheet dispersion to self-assemble to form a graphene nanoparticles/graphene nanoparticles heterojunction structure, and freeze-dried to obtain nanosheet anode material for sodium-ion batteries. The molar ratio of potassium salt, titanium oxide, niobium oxide is 1:2:(0.5-3), and calcination temperature is 900-1200 degrees Celsius, calcination time is 15-30 hours. USE - Method for preparing nano-sheet cathode material of sodium ion battery for use in sodium ion battery (claimed), lithium-ion battery used in energy storage device. ADVANTAGE - The method enables preparing nano-sheet cathode material of sodium ion battery, which has heterojunction built-in electric field, which can promote fast migration of sodium ion and electron in the battery charging and discharging process, exhibiting excellent multiplying power performance and cycle stability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a sodium ion battery, which is obtained by the preparation method of the nano-sheet cathode material of sodium ion battery