All-solid-state Li-ion batteries (ASSLIBs) are promising but face several challenges, especially regarding Li-metal anodes prone to dendrite formation and Si-based anodes with limited performance. To address this issue, we propose a self-stabilizing Sn-based anode. While Sn anodes suffer from agglomeration during cycling, transition metal-Sn anodes, specifically FeSn2 anodes, self-stabilize during cycling by exhibiting uniformity and densification without cycling-induced agglomeration, owing to their unique electrochemical-cycling-induced size reduction and distinctive mechanical properties. A full cell with an FeSn2 anode, a LiNi0.6Co0.2Mn0.2O2 cathode, and a Li6PS5Cl solid electrolyte exhibits highly reversible areal capacity (15.54 mAh cm−2 at 100 mg cm−2 cathode loading), excellent rate capability (74.5%/83.2% retention over 1,000 cycles at 10/20 C), and exceptional energy density at high current densities. The self-stabilizing FeSn2 anodes offer high energy density, compatibility with solid electrolytes, safety, wide operating temperature range, cost effectiveness, and scalability, thereby accelerating the realization of superior ASSLIBs.

中文翻译：

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为全固态锂离子电池提供自稳定 Sn 基负极


全固态锂离子电池 （ASSLIB） 前景广阔，但也面临一些挑战，尤其是在容易形成枝晶的锂金属负极和性能有限的硅基负极方面。为了解决这个问题，我们提出了一种自稳定的 Sn 基阳极。虽然 Sn 负极在循环过程中会结块，但过渡金属-Sn 负极，特别是 FeSn2 负极，由于其独特的电化学循环诱导的尺寸减小和独特的机械性能，它们在循环过程中表现出均匀性和致密化而没有循环诱导的团聚，从而自我稳定。具有 FeSn2 负极、LiNi0.6Co0.2Mn0.2O2 阴极和 Li6PS5Cl 固体电解质的全电池表现出高度可逆的面容量（在 100 mg cm-2 阴极负载下为 15.54 mAh cm-2）、出色的倍率能力（在 10/20 C 下 1,000 次循环中保持 74.5%/83.2%），以及在高电流密度下出色的能量密度。自稳定的 FeSn2 负极具有高能量密度、与固体电解质的兼容性、安全性、宽工作温度范围、成本效益和可扩展性，从而加速实现卓越的 ASSLIB。