Lithium Insertion in Carbons Containing Nanodispersed Silicon

摘要: Graphite and pregraphitic carbons are intercalation hosts commonly used in Li ion cells. Using chemical vapor deposition of benzene silicon-containing precursors, the authors have prepared containing nanodispersed silicon. The silicon resides within unorganized regions carbons. Materials with up to 11% atomic been prepared. These materials reversibly react lithium electrochemical cells reversible specific capacity increases from {approximately}300 mAh/g, absence silicon, near 500 mAh/g as is added. For content < 6 percent, linearly a slope approximately 30 per percentage point This suggests that each atom can bond {approximately}1.5 atoms. increased due appears broad feature differential between 0.1 0.6 V vs. metal. large capacities maintained over many charge/discharge cycles. carbonaceous matrix provides pathway for diffusion atoms, while it still intercalate substantial amount lithium. Nanodispersions other alloying atoms carbon probably be