NOVELTY - Sulfur particles (1) are thermally treated, and a mesoporous conductive material (3) in macroscale is added to the sulfur solution (2) and pressurized to be immersed in the sulfur solution, and the pressurized and molten state is maintained. The sulfur particles and conductive material are cooled such that sulfur within pores of the conductive material is crystallized to form a sulfur-infiltrated mesoporous conductive composite (4). The composite is cooled and ground to obtain a sulfur-infiltrated mesoporous conductive nanocomposite (5).    USE - Fabrication of sulfur-infiltrated mesoporous conductive nanocomposite for use in fabrication of cathodes (claimed) of lithium-sulfur secondary batteries used in electric vehicles. Can also be used for power saving systems, mobile phones, camcorders, and laptop computers.    ADVANTAGE - The method provides sulfur-infiltrated mesoporous conductive nanocomposites which enable fabrication of cathode materials having a relatively high content of sulfur. The nanocomposite enables economical mass-production of lithium-sulfur secondary batteries having high energy density. The mesoporous conductive material used can be fabricated by a simple and economical method.    DETAILED DESCRIPTION - Sulfur particles are thermally treated in a reactor (10) at a high temperature to melt the sulfur particles. A mesoporous conductive material in macroscale is added to the sulfur solution in the reactor, and pressurized in the reactor at an upper portion of the reactor such that the conductive material is completely immersed in the sulfur solution, and the pressurized and molten state is maintained. The sulfur particles and conductive material are cooled such that sulfur within pores of the conductive material is crystallized to form a sulfur-infiltrated mesoporous conductive composite. The composite is ground after cooling to fabricate a sulfur-infiltrated mesoporous conductive nanocomposite. An INDEPENDENT CLAIM is included for fabrication of cathode material.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view explaining the fabrication of sulfur-infiltrated mesoporous conductive nanocomposite for cathode of lithium-sulfur secondary battery.    Sulfur particles (1)    Sulfur solution (2)    Mesoporous conductive material (3)    Sulfur-infiltrated mesoporous conductive composite (4)    Sulfur-infiltrated mesoporous conductive nanocomposite (5)    Reactor (10)