The dendrites is deemed to be one of the most crucial problems for lithium-ion batteries because it hampers their safety and cycling performance severely. Herein, a cellulose acetate-based separator with uniformly distributed nanopores was engineered and successfully prepared through a simple one-step process. The controlled nanopores promoted uniform transmission of ions and the cellulose acetate backbone inhibited the transference of anions, and prevented large-scale accumulation of lithium ions, thereby restricting the nucleation and growth of dendrites. The 3D-networked separator exhibited capacity retention of 78.6% after 900 cycles at 1C, with the breaking elongation and the strength increased by 620% and 28.4%, respectively, which originated from the porosity controlling of the nanofiber inter-bridging. The nanopore-assembled structure of 3D-hierarchy with MOFs provided the channels for the lithium ions transference through the separator and hence tackled the major challenge of mechanical vulnerability and electrochemical instability, which have never been reported before. Therefore, the developed strategy may offer a powerful and effective alternative for conventional approach of occurring dendrites post-treatments for higher ionic conductivity.

枝晶被认为是锂离子电池最关键的问题之一，因为它严重影响了它们的安全性和循环性能。在此，通过简单的一步工艺设计并成功制备了一种具有均匀分布的纳米孔的醋酸纤维素基隔膜。受控的纳米孔促进了离子的均匀传输，醋酸纤维素骨架抑制了阴离子的迁移，阻止了锂离子的大规模积累，从而限制了枝晶的成核和生长。3D 网络化隔膜在 1C 下循环 900 次后容量保持率为 78.6%，断裂伸长率和强度分别提高了 620% 和 28.4%，这源于纳米纤维间桥接的孔隙率控制。具有 MOF 的 3D 层级的纳米孔组装结构为锂离子通过隔膜的转移提供了通道，从而解决了以前从未报道过的机械易损性和电化学不稳定性的主要挑战。因此，所开发的策略可以为传统的发生枝晶后处理以获得更高离子电导率的方法提供强大而有效的替代方案。