Large-Scale Nanofiber Manufacturing| Competitive Coordination and Dual InterphaseRegulation of MOF-Modified Solid-State PolymerElectrolytes for High-Performance Sodium MetalBatteries

Nankai University’s Prof. Jiao Lifang (National Outstanding Young Scholar) Angew.: MOF-Modified Solid Polymer Electrolyte for High-Performance Sodium Metal Batteries

Challenge: Solid polymer electrolytes (SPEs) are promising candidates for solid-state sodium metal batteries (SMBs) due to enhanced flexibility and lower interfacial resistance. However, their performance is limited by poor Na⁺ conductivity at room temperature, disordered ion transport, and interfacial instability.

Approach: Prof. Jiao Lifang introduced 3D interconnected copper metal-organic frameworks (Cu-MOF) on polyacrylonitrile (PAN) nanofibers into poly(ethylene oxide) (PEO)-based SPEs to construct a composite electrolyte (PPNM).

Innovation 1: Leveraging Cu-MOF and PAN’s multifunctionality, PPNM achieved exceptional ionic conductivity (1.03×10⁻⁴ S cm⁻¹) and high Na⁺ transference number (0.58) at 25°C.

Innovation 2: Cu-MOF’s strong TFSI⁻ anchoring facilitated inorganic-rich (NaF/Na₃N) CEI/SEI layers, enhancing dual interfacial stability. The Na₃V₂(PO₄)₃@C/PPNM/Na full cell delivered 2000 stable cycles at 200 mA g⁻¹.