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The composite of porous silicon (Si) and amorphous carbon (C) is prepared by pyrolysis of a nano-porousSi + pitch mixture. The nano-porous Si is prepared by mechanical milling of magnesium powder with silicon monoxide(SiO) followed by removal of MgO with hydrochloric acid (etching process). The Brunauer-Emmett-Teller (BET) sur-face area of porous Si (64.52 m 2 g −1 ) is much higher than that before etching Si/MgO (4.28 m 2 g −1 ) which indicates poresare formed in Si after the etching process. Cycling stability is examined for the nano-porous Si + C composite and theresult is compared with the composite of nonporous Si + C. The capacity retention of the former composite is 59.6%after 50 charge/discharge cycles while the latter shows only 28.0%. The pores of Si formed after the etching process isbelieved to accommodate large volumetric change of Si during charging and discharging process.Keywords: Porous, Silicon, Anode, Lithium ion battery, Composite

Preparation and Characterization of Porous Silicon and Carbon Composite as an Anode Material for Lithium Rechargeable Batteries