▎ 摘　　要

NOVELTY - The fabrication method involves exposing suspension of exfoliated, oxidized graphene sheets (102) to acid at acid concentration high enough, and exposure time long enough, to generate defect pores formed from carbon vacancies in the oxidized graphene sheets, and removing oxidized graphene sheets from suspension. The oxidized graphene sheets are reduced to form a vertical stack of graphene sheets (104) having random distribution of defect pores (106). The oxidized graphene sheets in suspension are mixed with electrochemically active nanoparticles e.g. silicon nanoparticles. USE - Fabrication method for making electrode material used in electrode of battery such as lithium ion battery. ADVANTAGE - The electrochemically active materials such as silicon are incorporated into the present structures to provide composite materials that take advantage of the enhanced Lithium ion diffusion and are able to provide electrodes having high power capabilities and storage capacities, without sacrificing mechanical properties and machinability. Offers combined advantages of high electrical conductivity and structural stability of graphite with the flexibility of graphene sheets, as well as high Lithium ion storage capacity of the electrochemically active material. Eliminates principal causes of battery performance degradation due to the ability to maintain electrical contact even when electrochemically active material undergoes morphological changes and/or agglomeration or fracturing during cycling. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the cross-section of a vertical stack made of graphene sheets with randomly distributed two-dimensional defect pores and a vertical stack of graphene sheets that includes disordered portions. Graphene-based material (100) Graphene sheets (102) Vertical stack of graphene sheets (104) Defect pores (106)