Cl-rich Li-argyrodites are one type of sulfide solid electrolytes (SSEs) with a high ionic conductivity and suitable mechanical properties for practical application. However, their tolerance against moisture in air and compatibility with metallic Li need further improvements. Here, we demonstrate that Nb-O dual-doping can be a good strategy for advanced Cl-rich Li-argyrodite SSEs, prepared by high energy ball milling and annealing method. Our results show that the Nb-O co-doping enhances the interface compatibility towards metallic Li and improves the moisture resistance, while maintains a fast ion transport. The Nb-O incorporation improves the Young's modulus and mitigates the side reaction of Li-argyrodite with Li. The doping-optimized sample demonstrates a high critical current density of 2.28 mA cm−2 and a long-term Li plating/stripping stability under a relatively high current density (1 mA cm−2) for nearly 3000 cycles. Notably, the corresponding all-solid-state lithium batteries (ASSLBs), using a Li metal electrode, can maintain a superior cycling stability for over 1000 cycles at 1 C.

中文翻译：

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增强 Nb-O 掺杂 Cl 富锂银辉体的空气稳定性和界面兼容性，用于全固态锂金属电池


富 Cl 银辉石是一种硫化物固体电解质 （SSE），具有高离子电导率和适合实际应用的机械性能。然而，它们对空气中水分的耐受性和与金属锂的相容性需要进一步改进。在这里，我们证明了 Nb-O 双掺杂可以成为通过高能球磨和退火方法制备的高级富 Cl 锂银辉体 SSE 的良好策略。我们的结果表明，Nb-O 共掺杂增强了与金属 Li 的界面兼容性，提高了耐湿性，同时保持了快速的离子传输。Nb-O 掺入提高了杨氏模量并减轻了 Li-argyrodite 与 Li 的副反应。掺杂优化样品表现出 2.28 mA cm-2 的高临界电流密度，并且在相对较高的电流密度 （1 mA cm-2） 下具有近 3000 次循环的长期镀锂/剥离稳定性。值得注意的是，相应的全固态锂电池 （ASSLB） 使用锂金属电极，可以在 1 C 下保持超过 1000 次循环的卓越循环稳定性。