▎ 摘　　要

NOVELTY - Nanocomposite material comprises manganese oxide nanowire covered with the nitrogen-doped graphene. USE - Nanocomposite material. ADVANTAGE - The nanocomposite material has improved electrochemical property, and ensures simple and cost-effective preparation method. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing nanocomposite material, which involves: (A) dissolving graphene oxide, potassium permanganate and formamide in water; (B) mixing the obtained materials to obtain a liquid, and then keeping it into a reaction vessel; (C) sealing the reaction vessel and then putting the sealed material into muffle furnace; (D) heating the obtained material and then performing hydro-thermal reaction of the liquid to obtain reaction product; and (E) cooling the reaction product to room temperature and then washing and drying it to obtain desired product.