Lithium (Li) metal anodes have regained intensive interest in recent years due to the ever-increasing demand for next-generation high energy battery technologies. Li metal, unfortunately, suffers from poor cycling stability and low efficiency as well as from the formation of dangerous Li dendrites, raising safety concerns. Utilizing solid-state electrolytes (SSEs) to prevent Li dendrite growth provides a promising approach to tackle the challenge. However, recent studies indicate that Li dendrites easily form at high current densities, which calls for full investigation of the fundamental mechanisms of Li dendrite formation within SSEs. Herein, the origin and evolution of Li dendrite growth through SSEs have been studied and compared by using Li_6.1Ga_0.3La₃Zr₂O₁₂ (LLZO) and NASICON-type Li₂O–Al₂O₃–P₂O₅–TiO₂–GeO₂ (LATP) pellets as the separators. We discover that a solid electrolyte interphase (SEI)-like interfacial layer between Li and SSE plays a critical role in alleviating the growth of dendritic Li, providing new insights into the interface between SSE and Li metal to enable future all solid-state batteries.

中文翻译：

---

固态电解质界面层在防止固态电池中锂枝晶生长中的作用†

近年来，由于对下一代高能电池技术的需求不断增长，锂（Li）金属阳极引起了广泛的关注。不幸的是，锂金属遭受循环稳定性差和效率低以及形成危险的锂树枝状晶体的问题，从而引起安全问题。利用固态电解质（SSE）防止Li树枝状晶体生长为解决这一挑战提供了一种有前途的方法。但是，最近的研究表明，高电流密度下容易形成锂枝晶，这需要对SSE内部锂枝晶形成的基本机理进行全面研究。在本文中，通过使用Li _6.1 Ga _0.3 La ₃ Zr研究和比较了SSE引起的Li枝晶生长的起源和演化。₂ O ₁₂（LLZO）和NASICON型Li ₂ O–Al ₂ O ₃ –P ₂ O ₅ –TiO ₂ –GeO ₂（LATP）球团作为隔离物。我们发现，Li和SSE之间的固态电解质相（SEI）界面层在减轻树枝状Li的生长中起关键作用，从而为SSE和Li金属之间的界面提供了新的见识，从而使未来的所有固态电池都可以使用。