Interfacial regulation on Na metal/solid electrolytes benefits for realizing room temperature solid-state sodium metal battery for energy storage technique, yet remains challenging due to rigid solid-solid contact and unmanageable dendrite growth. To suit the remedy to the annoying interfacial trouble, a highly efficient ultrasound welding (UW) strategy is rolled out and successfully verified by Na/Beta-Al₂O₃ interface in one minute. The UW-Na/Beta-Al₂O₃/UW-Na symmetric cell accompanied by a critical current density of 0.65 mA cm⁻² can be cycled stably for over 800 h at 0.1 mA cm⁻² at room temperature. Integrating into polyanion-typed Na₃V₂(PO4)₃ cathode with three-dimensional Na⁺ transport, the room-temperature sodium metal full battery delivers a high energy density of 234 Wh kg⁻¹ under a high power density of 1773 W kg⁻¹. Such full battery provides a reversible capacity of 86 mA h g⁻¹ after 700 cycles at 0.5 C with a capacity retention of 86.66%. This work elucidates the atom-level ultrasonic welding strategy for constructing compact Na/Beta-Al₂O₃ interface, providing rational design on engineering Na/solid electrolyte interface for solid-state sodium metal battery.

钠金属/固体电解质的界面调控有利于实现用于储能技术的室温固态钠金属电池，但由于刚性固-固接触和难以控制的枝晶生长，仍然具有挑战性。为了解决烦人的界面问题，推出了一种高效的超声焊接（UW）策略，并在一分钟内通过Na/Beta-Al ₂ O _{3界面成功验证。}伴随着0.65 mA cm ^-2临界电流密度的UW-Na/Beta-Al ₂ O ₃ /UW-Na 对称电池可以在室温下以0.1 mA cm ^{-2稳定循环超过800小时。}融入聚阴离子型 Na ₃ V ₂(PO4) ₃正极具有三维Na ⁺传输，室温钠金属全电池在1773 W kg ^{-1的高功率密度下提供234 Wh kg -1}的高能量密度。这种充满电的电池在 0.5 C 下 700 次循环后提供 86 mA hg ^-1的可逆容量，容量保持率为 86.66%。_{该工作阐明了构建致密Na/Beta-Al 2} O ₃界面的原子级超声焊接策略，为固态钠金属电池的工程Na/固体电解质界面提供了合理的设计。