Solid-state interfaces play a significant role in the overall electrochemical performance of solid-state batteries (SSBs). However, the understanding of interface dynamics between solid-state electrolytes (SSEs) and Li metal remains limited, especially their effects on Li dendrite growth. Herein, three different interfaces are fabricated based on garnet-type SSEs and the Li penetration behaviors across the interfaces are investigated. The lithiophilic garnet/Li interface, with an initially low resistance, can be gradually broken and the growing voltage hysteresis drives the Li nucleation and proliferation through the grain boundary of the garnet ceramic bulk. The results indicate that a three-dimensional garnet/Li interface can remain stable due to the decreased local current density and minimized Li volume change, thus suppressing the dendrite formation. This work not only provides further understanding of the relationship between the SSE/Li interface and Li dendrite growth but also provides guidelines for the future design of dendrite-free SSBs.

中文翻译：

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Garnet / Li接口的无树突状固态电池的动力学

固态界面在固态电池（SSB）的整体电化学性能中起着重要作用。但是，对固态电解质（SSE）和锂金属之间的界面动力学的理解仍然有限，尤其是它们对锂枝晶生长的影响。在本文中，基于石榴石型SSE制作了三种不同的界面，并研究了Li跨界面的渗透行为。最初具有低电阻的亲硫石榴石/ Li界面可以逐渐被破坏，并且不断增加的电压滞后作用会促使Li形核并通过石榴石陶瓷块体的晶界扩散。结果表明，由于局部电流密度的减小和锂体积的变化最小，三维石榴石/锂界面可以保持稳定，因此抑制了枝晶的形成。这项工作不仅可以进一步了解SSE / Li界面与Li树枝状晶体生长之间的关系，而且还可以为无枝状SSB的未来设计提供指导。