Li metal is considered to be an ultimate anode for metal batteries owing to its extremely high theoretical capacity and lowest potential. However, numerous issues such as short lifespan and infinite volume expansion caused by the dendrite growth during Li plating/stripping hinder its practical usage. These challenges become more grievous under high current densities. Herein, 3D porous MXene aerogels are proposed as scaffolds for high‐rate Li metal anodes using Ti₃C₂ as an example. With high metallic electron conductivity, fast Li ion transport capability, and abundant Li nucleation sites, such scaffolds could deliver high cycling stability and low overpotential at current density up to 10 mA cm⁻². High rate performance is also demonstrated in full cells with LiFePO₄ as cathodes. This work provides a new type of scaffolds for Li metal anodes and paves the way for the application of non‐graphene 2D materials toward high energy density Li metal batteries.

中文翻译：

---

用于高速率锂金属阳极的MXene气凝胶支架

锂金属由于其极高的理论容量和最低的电位而被认为是金属电池的最终阳极。然而，由于锂电镀/剥离期间枝晶生长而引起的诸如寿命短和无限的体积膨胀之类的许多问题阻碍了其实际使用。在高电流密度下，这些挑战变得更加严峻。在本文中，以Ti ₃ C ₂为例，提出了3D多孔MXene气凝胶作为高速率锂金属阳极的支架。具有高金属电子传导性，快速的锂离子迁移能力和丰富的锂成核位点，此类支架可以在高达10 mA cm ^-2的电流密度下提供高循环稳定性和低超电势。在以LiFePO ₄为阴极的全电池中也证明了高倍率性能。这项工作为锂金属阳极提供了一种新型的支架，并为将非石墨烯2D材料应用于高能量密度锂金属电池铺平了道路。