Stretchable batteries are key components of stretchable/flexible electronic devices. However, they typically exhibit low energy density due to the low lithium storage capability. Lithium (Li) metal is the ideal anode material, but it is ductile and the unstable electrochemical performance further hinders its practical applications. Herein, for the first time, a stretchable Li metal anode with stable mechanical and electrochemical performance is fabricated. It consists of one-entity 3D-patterned Li metal microdomains connected by highly elastic polymer rubbers. Upon stretching, the rubber absorbs the mechanical energy while the electroactive Li domains are not mechanically strained. Moreover, the whole electrode is fabricated by simply winding one single Cu wire, which is facile and cost-effective. The stretchable Li metal anode is a key step in the development of novel stretchable “lithium batteries” rather than traditional stretchable “lithium-ion batteries” to boost the energy density of stretchable energy-storage devices.

可伸缩电池是可伸缩/柔性电子设备的关键组件。然而，由于锂存储能力低，它们通常表现出低能量密度。锂（Li）金属是理想的阳极材料，但它具有延展性，并且不稳定的电化学性能进一步阻碍了其实际应用。本文中，首次制备了具有稳定的机械和电化学性能的可拉伸锂金属阳极。它由通过高弹性聚合物橡胶连接的单实体3D图案Li金属微区组成。拉伸后，橡胶吸收机械能，而电活性Li域没有机械应变。而且，整个电极是通过简单地缠绕一根单根铜线来制造的，这是容易且经济的。