The numerous grainboundaries solid electrolyte interface, whether naturally occurring or artificially designed, leads to non-uniform Li metal deposition and consequently results in poor full-battery performance. Herein, a lithium-ion selective transport layer is reported to achieve a highly efficient and dendrite-free lithium metal anode. The layer-by-layer assembled protonated carbon nitride nanosheets present uniform macroscopical structure without grainboundaries. The carbon nitride with ordered pores in basal plane provides high-speed lithium-ion transport channels with low tortuosity. Consequently, the assembled 324 Wh kg⁻¹ pouch cell exhibits 300 stable cycles with a capacity retention of 90.0% and an average Coulombic efficiency up to 99.7%. The ultra-dense Li metal anode makes current collector-free anode possible, achieving high energy density and long cycle life of a 7 Ah cell (506 Wh kg⁻¹, 160 cycles). Thus, it is proved that a macroscopically uniform interface layer with lithium-ion conductive channels could achieve Li metal battery with promising application potential.

众多的晶界固体电解质界面，无论是自然存在的还是人工设计的，都会导致不均匀的锂金属沉积，从而导致电池满载性能不佳。在此，据报道，锂离子选择性传输层可实现高效且无枝晶的锂金属负极。逐层组装的质子化氮化碳纳米片呈现无晶界的均匀宏观结构。基平面中具有有序孔隙的氮化碳提供了低曲折度的高速锂离子传输通道。因此，组装的 324 Wh ^kg-1 软包电池表现出 300 次稳定循环，容量保持率为 90.0%，平均库仑效率高达 99.7%。超致密的锂金属负极使无集流体负极成为可能，实现了 7 Ah 电池的高能量密度和长循环寿命（506 Wh ^kg-1,160 次循环）。因此，证明具有锂离子导电通道的宏观均匀界面层可以实现具有良好应用潜力的锂金属电池。