Solid–Solution-Based Metal Alloy Phase for Highly Reversible Lithium Metal Anode

作者：Song Jin, Yadong Ye, Yijie Niu, Yan‐Song Xu, Hongchang Jin, Jinxi Wang, Zhaowei Sun, Amin Cao, Xiaojun Wu, Yi Luo, Hengxing Ji, Li‐Jun Wan · 发表于：Journal of the American Chemical Society · 年份：2020 · DOI：10.1021/jacs.0c01811 · 被引用次数：399 · 研究领域：Advancements in Battery Materials、Advanced Battery Materials and Technologies、Advanced Battery Technologies Research

Lithium metal batteries are vital devices for high-energy-density energy storage, but the Li metal anode is highly reactive with electrolyte and forms uncontrolled dendrite that can cause undesirable parasitic reactions and, thus, poor cycling stability and raise safety concerns. Despite remarkable progress to partially solve these issues, the Li metal still plates at the electrode/electrolyte interface where the parasitic reactions and dendrite formation invariably occur. Here, we demonstrate the inward-growth plating of Li atoms into a metal foil of thickness of tens of micrometers while avoiding surface deposition, which is driven by the reversible solid–solution-based alloy phase change. Lithiation of the solid–solution alloy phase allows the freshly generated Li atoms at the surface to sink into the metal foil, while the reversible alloy phase change is companied by the dealloying reaction during delithiation, which extracts Li atoms from inside of the metal foil. The yielded dendrite free Li anode produces an enhanced Coulombic efficiency of 99.5 ± 0.2% with a reversible capacity of 1660 mA h g –1 (3.3 mA h cm –2 ).