Graphite-FeSi alloy composites as anode materials for rechargeable lithium batteries

초록

Iron-silicon are prepared by annealing elemental mixtures at 1000 °C followed by mechanical milling. Graphite-Fe<inf>20</inf>Si<inf>80</inf> alloy composites have been prepared by ball-milling a mixture of Fe<inf>20</inf>Si<inf>80</inf> alloy and graphite powder. The microstructure and electrochemical performance of the composites are characterized by X-ray diffraction and an electrochemical method. The FeSi<inf>2</inf> matrix is stable for extended cycles and acts as a buffer for the active centre, Si. The Fe<inf>20</inf>Si<inf>80</inf> alloy electrode delivers large initial capacity, but the capacity degrades rapidly with cycling. Fe<inf>20</inf>Si<inf>80</inf> alloy-graphite composite electrodes, however, show good cycleability and a high reversible capacity of about 600 mAh g-1. These composites appear to be promising candidates for negative electrodes in lithium rechargeable batteries. © 2002 Elsevier Science B.V. All rights reserved.

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