Although solid-state lithium (Li) batteries theoretically have higher energy density and better safety than organic solvent-based Li-ion batteries, they currently suffer from problems such as poor power density and rapid performance degradation, hindering their wide applications. The cause of these problems can be largely related to the electrode material|solid-state electrolyte (SSE) interface, which sets a significant barrier for Li⁺ ions to transport across. As a result, an in-depth fundamental understanding of the reaction and process occurring at the electrode material|SSE interface is of paramount importance to alleviate the interfacial impedance and enhance the performance of solid-state Li batteries. This Perspective focuses on the Li|SSE interface, points out the critical challenges for a reversible, dendrite-free, and high-rate Li electrode, recapitulates potential resolutions for these challenges, and highlights the significance of advanced research techniques having the ability to interrogate the buried Li|SSE interfaces.

尽管理论上固态锂（Li）电池比有机溶剂基锂离子电池具有更高的能量密度和更好的安全性，但它们目前仍面临诸如功率密度低和性能快速下降之类的问题，从而阻碍了其广泛应用。这些问题的原因在很大程度上与电极材料（SSE）界面有关，这对Li ⁺设置了很大的障碍。离子穿越。结果，深入了解电极材料在SSE界面上发生的反应和过程，对于减轻界面阻抗并增强固态Li电池的性能至关重要。本“观点”着重于Li | SSE界面，指出了可逆，无枝晶和高速率Li电极的关键挑战，概述了应对这些挑战的潜在解决方案，并强调了具有研究能力的先进研究技术的重要性掩埋的Li | SSE接口。