▎ 摘　　要

NOVELTY - A hollow component (100) comprises a hollow structure (120) comprising accumulated graphene (110), and transition metal oxide particles (130) positioned between the accumulated graphene and on the surface of graphene. USE - Hollow component is used for forming active material of negative electrode used for lithium-ion secondary battery (all claimed) used for portable electronic device such as notebook personal computer and mobile telephone. ADVANTAGE - The hollow component has high conductivity, versatility and binding performance without using a binder. Graphene accumulating the volume change accompanying occlusion/release of lithium ions can be suppressed. The negative electrode formed using the hollow component provides battery with excellent durability, improved rate characteristics, and rapid charging/discharging characteristics while attaining high energy density and power density. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) manufacture of hollow component, which involves dispersing graphene oxide and a transition metal salt in a solvent and stirring to obtain transition metal oxide particles positioned on the surface of graphene oxide, adding the solvent in which transition metal oxide particles are located on graphene oxide, to an aqueous solution in which a polymeric core is dispersed, stirring the obtained solution to obtain a core-shell structure in which graphene oxide is accumulated and coated with the transition metal oxide particles, and heating the core-shell structure for removing the polymeric core; and (2) lithium-ion secondary battery, which comprises a negative electrode comprising a negative electrode active material comprising the hollow component, a cathode and an electrolyte. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the hollow component. Hollow component (100) Graphene (110) Hollow structure (120) Transition metal oxide particles (130) Connection portion (140)