Smart MOF separator towards long-cycling high-energy-density sodium-metal batteries

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ID: 326508
2026
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Abstract
Abstract The practical advancement of sodium-metal batteries (SMBs) is hindered by unstable anode/cathode interfaces and suboptimal ion transport kinetics. Traditional separators, functioning as passive elements, fail to effectively regulate ionic flux and interfacial chemistry, leading to low Na+ transference numbers, pronounced concentration polarization, and unstable electrode interphases. This study introduces a novel smart separator based on medium-entropy metal-organic framework (EMOF). By incorporating ion-confinement mechanisms within sub-nanochannels, it synergistically regulates Na+ transport and interfacial reaction kinetics. The EMOF separator establishes a hierarchical capillary system: macroscale channels ensure rapid electrolyte wettability, while nanoconfinement channels guide uniform Na+ flux distribution. Its multicomponent medium-entropy architecture endows channel surfaces with specific electrostatic environments that effectively anchor PF6− anions, elevating the Na+ transference number to 0.81. Significantly, this configuration further promotes PF6− decomposition, promoting the in-situ formation of inorganic-rich and stable electrode-electrolyte interphase layers. Leveraging these synergistic mechanisms, SMBs employing the EMOF separator in Na3V2(PO4)2O2F systems achieve an ultra-high energy density of 296.5 Wh kg−1 based on the mass of electrode materials, and outstanding fast-charging capability, maintaining 87.1% capacity retention even at 10 C rate, showcasing superior comprehensive performance. This work transcends the conventional paradigm of separators as inert barriers, establishing a new design framework for high-performance SMBs.
Reference Key
openalex_W7204233954 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Han‐Hao Liu, Yue Liu, Jialin Yang, Xin-Yi Zhang, Hong‐Yan Lü, Xiao-Tong Wang, Changshan Xu, Zhen‐Yi Gu, Xing‐Long Wu
Journal national science review
Year 2026
DOI
10.1093/nsr/nwag542
URL
https://doi.org/10.1093/nsr/nwag542
Keywords Keywords not found

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