To achieve good rate capability of lithium metal anodes for high-energy-density batteries, one fundamental challenge is the slow lithium diffusion at the interface. Here we report an interpenetrated, three-dimensional lithium metal/lithium tin alloy nanocomposite foil realized by a simple calendering and folding process of lithium and tin foils, and spontaneous alloying reactions. The strong affinity between the metallic lithium and lithium tin alloy as mixed electronic and ionic conducting networks, and their abundant interfaces enable ultrafast charger diffusion across the entire electrode. We demonstrate that a lithium/lithium tin alloy foil electrode sustains stable lithium stripping/plating under 30 mA cm-2 and 5 mAh cm-2 with a very low overpotential of 20 mV for 200 cycles in a commercial carbonate electrolyte. Cycled under 6 C (6.6 mA cm-2), a 1.0 mAh cm-2 LiNi0.6Co0.2Mn0.2O2 electrode maintains a substantial 74% of its capacity by pairing with such anode.

中文翻译：

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机械轧制超高倍率电池阳极用互穿锂金属/锂锡合金箔。

为了实现用于高能量密度电池的锂金属阳极良好的倍率能力，一个基本挑战是界面处缓慢的锂扩散。在这里，我们报告了一种互穿的，三维的锂金属/锂锡合金纳米复合箔，该箔通过锂和锡箔的简单压延和折叠过程以及自发的合金反应而实现。金属锂和锂锡合金之间作为混合的电子和离子导电网络具有很强的亲和力，并且它们丰富的界面使充电器能够在整个电极上快速扩散。我们证明，锂/锂锡合金箔电极可在30 mA cm-2和5 mAh cm-2下维持稳定的锂剥离/镀覆，在商用碳酸盐电解质中200次循环的超低电势为20 mV。在6 C下循环（6。