With the rapid development of high-end electronic devices such as electric vehicles and portable electronics products,the currently widely used lithium (Li)-ion batteries are found greatly difficult to meet the growing demand for energy storage [1, 2].Li metal batteries are highly regarded as a promising alternative because Li metal possesses high theoretical capacity (3860 mAh·g-1) and low redox potential (-3.04 V vs.SHE) [3].However, the wide applications of Li metal batteries are still hindered by severe challenges.Li dendrite growth, unstable solid electrolyte interphase (SEI), inactive lithium deposition,and large volume change during the repeated plating/stripping process induce low discharging capacity and short cycling life accompanied by safety hazards [4, 5].To address the aforementioned problems, many effective strategies have been proposed to prevent Li metal anodes from dendrite growth and improve the stability of the anode/electrolyte interface, including adding additives toelectrolytes, using safer electrolytes, making artificial SEI,and modifying the anode structure [6-8].However, these strategies are still unsatisfied.For instance, SEI-stabilized electrolyte additives are easily consumed as the cyclic goes on, the interfacial SEI are insufficiently stable during longterm charge/discharge cycles, and the uneven growth of Li dendrites can hardly be completely hindered in the inner space of three-dimensional (3D) hosts, which greatly limit the development of Li metal batteries.Another prospective route is designing nanoporous structure with uniform lithium-ion flow at the electrolyte/electrode interface,which can fundamentally suppress lithium dendrites and effectively achieve a dendrite-free lithium anode.