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High-capacity Si-based electrodes could replace carbon-based electrodes in the next generation of Li-ion batteries. Although Si-based electrodes have large gravimetric capacities, they typically suffer from poor cyclability. One reason for the poor cyclability is large volume expansion associated with 3.75 mol of Li reacting with 1 mol of Si. A theoretical approach to design electrodes that can accommodate this large volume expansion is discussed. It is shown that experimental results agree well with the theoretical approach. We show that Si-based electrodes with a relatively low Si content ͑Ͻ33 wt %͒ and high binder content ͑33-56 wt %͒ cycle at large capacities ͑ϳ660 mAh/g͒ for hundreds of cycles. No special electrode processing or cycling procedures are required to achieve high capacities with good cyclability.

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