Inorganic solid-state electrolyte (SSE) has offered a promising option for the safe rechargeable Li metal batteries. However, the solid–solid interfacial incompatibility greatly hampers the practical use. The interface becomes even worse during repeated Li plating/stripping, especially under high current density and long cycling operation. To promise an intimate contact and uniform Li deposition during cycling, we herein demonstrate a stress self-adapted Li/Garnet interface by integrating Li foil with a hyperelastic substrate. Consecutive and conformal physical contact was ensured at Li/Garnet interface during Li plating/stripping, therefore dissipating the localized stress, suppressing Li dendrite formation, and preventing Garnet cracks. Record long cycling life over 5000 cycles was achieved with the ultrasmall hysteresis of 55 mV at high current density of 0.2 mA cm^–2. Our strategy provides a new way to stabilize Li/Garnet interface from the perspective of anode mechanical regulation and paves the way for the next generation solid-state Li metal batteries.

中文翻译：

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具有应力自适应锂/石榴石界面的长循环寿命固态锂金属电池

无机固态电解质（SSE）为安全的可充电锂金属电池提供了有希望的选择。但是，固-固界面不相容性极大地妨碍了实际应用。在重复的锂电镀/剥离过程中，界面变得更糟，尤其是在高电流密度和长循环操作下。为了保证在循环过程中的紧密接触和均匀的Li沉积，我们在本文中通过将Li箔与超弹性基材集成在一起，展示了一种应力自适应Li / Garnet界面。在镀锂/剥离过程中，确保在Li /石榴石界面连续和共形的物理接触，从而消除了局部应力，抑制了Li枝晶的形成，并防止了石榴石裂纹。^–2。从阳极机械调节的角度来看，我们的策略提供了一种稳定锂/石榴石界面的新方法，并为下一代固态锂金属电池铺平了道路。