The commercialization of rechargeable Li metal batteries is hindered by dendrite growth and volumetric variation. Herein, we report a Li-rich dual-phase Li-Cu alloy with built-in 3D conductive skeleton to replace conventional planar Li anode. The Li-Cu alloy is simply prepared by fusion of Li and Cu metals at a relatively low-temperature of 500 °C, followed by a cooling process where phase-segregation leads to metallic Li phase distributed in the network of LiCu_x solid solution phase. Different from the common Li alloy, the electrochemical alloying reaction between Li and Cu metals is not observed. Therefore, the lithiophilic LiCu_x nanowires guides conformal plating of Li and the porous framework provides superior dimensional stability for the anode. This unique ferroconcrete-like structure of Li-Cu alloy enables dendrite-free Li plating for an expanded cycling lifetime. Constructing a new type of Li alloy with in situ formed electrochemically inactive framework is a promising and easily scaled-up strategy toward practical application of Li metal anodes.

可充电锂金属电池的商业化受到枝晶生长和体积变化的阻碍。在此，我们报道了一种具有内置 3D 导电骨架的富锂双相 Li-Cu 合金，以取代传统的平面锂负极。Li-Cu 合金是通过在 500 °C 的相对低温下将 Li 和 Cu 金属熔化，然后通过冷却过程简单制备的，其中相分离导致金属 Li 相分布在 LiCu _x固溶体相网络中. 与普通的锂合金不同，没有观察到锂和铜金属之间的电化学合金化反应。因此，亲锂 LiCu _x纳米线引导 Li 的保形电镀，多孔框架为阳极提供了卓越的尺寸稳定性。这种独特的类似钢筋混凝土的锂铜合金结构可实现无枝晶镀锂，从而延长循环寿命。构建一种具有原位形成的电化学惰性框架的新型锂合金是一种有前途且易于放大的锂金属负极实际应用策略。