▎ 摘　　要

NOVELTY - Preparing three-dimensional dendritic nitrogen-doped graphene nanotube used in lithium-sulfur battery, involves preparing one-dimensional nickel nanorod by using hydrothermal method in soluble nickel salt, water-soluble polymer soft template and hydrazine hydrate, preparing the graphene nanotubes coated with one-dimensional nickel nanorods by chemical vapor deposition, and immersing the graphene nanotubes in inorganic salt precursor solution to obtain graphite coated with inorganic salt precursors. USE - Preparing three-dimensional dendritic nitrogen-doped graphene nanotube used in lithium-sulfur battery (claimed). ADVANTAGE - The method enables to prepare three-dimensional dendritic nitrogen-doped graphene nanotube has good conductivity of graphene and expanded as mass of sulfur reserved space to prevent cracking caused by stress on outer branch-shaped carbon nano tube doped with nitrogen element, it is capable of absorbing lithium polysulfide, stopps dissolution and diffusion through comprehensive action, improves discharging efficiency and capacity circulating stability of the anode. DETAILED DESCRIPTION - Preparing three-dimensional dendritic nitrogen-doped graphene nanotube used in lithium-sulfur battery, involves preparing one-dimensional nickel nanorod by using hydrothermal method in soluble nickel salt, water-soluble polymer soft template and hydrazine hydrate, preparing the graphene nanotubes coated with one-dimensional nickel nanorods by chemical vapor deposition, and immersing the graphene nanotubes in inorganic salt precursor solution to obtain graphite coated with inorganic salt precursors. The obtained coated graphene nanotubes are heated to promote the decomposition of inorganic salt precursor coating in which nitrogen-doped carbon nanotubes are grown outside the graphene tube to obtain dendrites nitrogen-doped graphene nanotubes. The sulfur-solubilized solution is mixed with dendritic nitrogen-doped graphene nanotubes by fusion method to obtain three-dimensional dendritic nitrogen-doped graphene nanotubes. An INDEPENDENT CLAIM is included for lithium-sulfur battery, which comprises positive and negative battery case, separator, electrolyte, elastic sheet, steel sheet, positive and negative electrode current collector, and positive and negative electrode material. DESCRIPTION OF DRAWING(S) - The drawing shows schematic view of lithium-sulfur battery Nitrogen-doped graphene nanotubes (1) Graphene nano-tube (2) Sulfur nanorods (3) Nickel nanorods (4) Inorganic salt precursor coating (5)