“Anode-free” solid-state Li batteries have recently gained attention for achieving superior energy density by eliminating Li from the anode. However, they face significant challenges in practical applications, primarily due to the unstable interface between the solid electrolytes and the bare current collector. Here, we introduce an In-doped Ag metal coated current collector, which can induce a synergetic effect, and optimize the composition of Ag and In. Interestingly, with adding only small amount of In, the performance significantly improves compared to using Ag alone. Li undergoes the alloying reaction with Ag–In layer during Li deposition, as verified through scanning electron microscopy, X-ray photoelectron spectroscopy and X-ray diffraction analyses. In the full-cell tests with the NCM cathode, it delivered stable cycle life (>80 %) over 250 cycles at 1 C-rate and maintained a stable average Coulombic efficiency of 99.8 %. This study marks a significant step forward in enhancing interfacial stability and thereby extending the cycle life of anode-free solid-state Li batteries.

中文翻译：

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通过In掺杂Ag金属涂层的界面稳定策略可实现无阳极固态锂电池的高循环寿命

“无阳极”固态锂电池最近因通过消除阳极中的锂来实现卓越的能量密度而受到关注。然而，它们在实际应用中面临重大挑战，这主要是由于固体电解质和裸集流体之间的不稳定界面。在这里，我们介绍了一种In掺杂的Ag金属涂层集流体，它可以产生协同效应，并优化Ag和In的成分。有趣的是，仅添加少量 In，与单独使用 Ag 相比，性能显着提高。通过扫描电子显微镜、X射线光电子能谱和X射线衍射分析证实，Li在Li沉积过程中与Ag-In层发生合金化反应。在使用 NCM 阴极的全电池测试中，它在 1 C 倍率下可实现超过 250 个循环的稳定循环寿命 (>80%)，并保持稳定的平均库仑效率 99.8%。这项研究标志着在增强界面稳定性从而延长无阳极固态锂电池的循环寿命方面向前迈出了重要一步。