▎ 摘　　要

NOVELTY - Porous graphene nanosheet, having width of 1-20 mu m, thickness of 1-20 nm, aperture of 0.5-100 nm, main collective at 2-50 nm, specific surface area is 80-300 m2/g is claimed. USE - The nanosheet is used in lithium ion battery cathode material. ADVANTAGE - The nanosheet has high capacity and excellent performance. The method has simple preparation, is economical, causes less pollution, is easy to realize large scale production. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing porous graphene nanosheet comprising (i) using metal source, carbon source and curing agent according to metal and carbon atom ratio of (1:20)-(1:2), mixing with solvent, drying, removing solvent, curing obtained solid at 100-180 degrees C, placing product under the inert gas atmosphere, carbonizing at 400-1000 degrees C for 2-10 hours, (ii) taking carbonized product with excess of inorganic acid for leaching process to remove metal and metal oxide, then filtering, cleaning, drying, to obtain porous structure coal piece, and (iii) using the porous coal piece under inert atmosphere protection, carrying out graphitization at 2000-3000 degrees C for 0.5-3 hours to obtain porous graphite diluted nano sheet; and (2) lithium-ion battery cathode material comprising porous graphene nano sheet.