The uncontrolled nucleation behavior and the “hostless” Li propagation seriously hinder the commercialization of metallic Li anodes in the next-generation energy-dense batteries. Here we propose a honeycomb-inspired, high-strength scaffold with the tunable microstructural features to accommodate the Li deposits via a “pore-filling” behavior. The complementary components in the Al-Al_xO_y-C composite comprise the alloy-induced Li-Al intermediate embryos for the preferential nucleation and mixed-conducting nanosheet scaffold to homogenize the ion/electron mass transfer; as a result, the in-plane mechanical stress is accommodated during the substantial metal loading. This composite scaffold delivers a sustained Li plating/stripping cycling for 1700 h and exhibits high-areal-capacity value up to 15 mA h cm⁻² with the stable Coulombic efficiency over 99.5%. In the as-constructed full-cell (2 mA h) which integrates the Al-Al_xO_y-C metallic anode and the LiNi_0.8Mn_0.1Co_0.1O₂ cathode, the impressive energy densities of 454.4 Wh kg⁻¹ and robust cyclability up to 300 cycles are realized. The alloy-induced metallic deposition process, validated by the operando X-ray diffraction and density functional theory calculations, illustrates the competitive lithiation mechanism within the honeycomb scaffold.

不受控制的成核行为和“无基质”的锂扩散严重阻碍了下一代能量密集型电池中金属锂阳极的商业化。在这里，我们提出一种蜂窝状，高强度的脚手架，具有可调节的微结构特征，以通过“孔填充”行为容纳锂沉积物。Al-Al _x O _y中的互补成分-C复合材料包括合金诱导的Li-Al中间胚，用于优先成核和混合导电纳米片支架，以使离子/电子传质均匀。结果，在相当大的金属负载期间承受了平面内机械应力。该复合支架可实现持续的Li电镀/剥离循环1700 h，并显示高达15 mA h cm ^-2的高面积容量值，稳定的库仑效率超过99.5％。在整合了Al-Al _x O _y -C金属阳极和LiNi _0.8 Mn _0.1 Co _0.1 O ₂阴极的完工全电池（2 mA h）中，惊人的能量密度为454.4 Wh kg ^-1并实现了高达300个循环的强大循环能力。通过操作X射线衍射和密度泛函理论计算验证的合金诱导的金属沉积过程说明了蜂窝支架内的竞争性锂化机理。