▎ 摘　　要

NOVELTY - An electrochemically active material (30) comprises composite particles (26), each composite particle containing core material encapsulated within a shell (28) which contains reduced graphene oxide and/or graphene oxide. The composite particles have a Brunauer-Emmett-Teller (BET) surface area of less than or equal to 75 m2/g. USE - An electrochemically active material for electrode used for a battery (all claimed). ADVANTAGE - The composite particle structure of the electrochemically active material comprises a shell having a void space that allows for mechanical expansion of electrochemically active particles, i.e. silicon. As a result, silicon particles remain intact, minimizing capacity loss and reduction in cell capacity. Also, lithium ions within the cathode active material are more fully utilized to generate reversible capacity through active exchange of lithium ions between anode and cathode, and as a result, intended capacity of the cathode and lithium-ion cell is preserved, minimizing reduced capacity, particularly over a significant number of charge/discharge cycles. The electrode using the electrochemically active material has increased capacity and cycle life. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) electrode comprising the electrochemically active material (30) and a binder (2) battery comprising the electrode as an anode, cathode, casing housing the anode and cathode, and an electrolyte disposed between the anode and cathode; and (3) fabrication of electrochemically active material which involves forming dispersion containing solvent, graphene oxide, and silicon nanoparticles, nebulizing dispersion to form droplets, and heating droplets at 100-300 degrees C. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of a particle of the electrochemically active material having a spherical structure. Composite particle (26) Graphene-based shell (28) Electrochemically active nanoparticles (30)