Confining Polymer Electrolyte in MOF for Safe and High‐Performance All‐Solid‐State Sodium Metal Batteries

• DOI: 10.1002/anie.202318822
• Publication Date: 2024-02-19T13:49:45Z
• Authors: Jinfang Zhang; Yuanyuan Wang; Qingbing Xia; Xiaofeng Li; Bin Liu; Tuoping Hu; Mike Tebyetekerwa; Shengliang Hu; Ruth Knibbe; Shulei Chou
• Keywords: Polymer Electrolytes

Abstract Nanoconfined polymer molecules exhibit profound transformations in their properties and behaviors. Here, we present the synthesis of a polymer‐in‐MOF single ion conducting solid electrolyte, where segments are partially confined within nanopores ZIF‐8 particles through Lewis acid‐base interactions for solid‐state sodium‐metal batteries (SSMBs). The unique nanoconfinement effectively weakens Na coordination with anions, facilitating dissociation from salt. Simultaneously, well‐defined provide oriented ordered migration channels migration. As result, this pioneering design allows electrolyte to achieve transference number 0.87, conductivity 4.01×10 −4 S cm −1 , an extended electrochemical voltage window up 4.89 V vs. Na/Na + . assembled SSMBs (with 3 2 (PO 4 ) as cathode) dendrite‐free Na‐metal deposition, promising rate capability, stable cycling performance 96 % capacity retention over 300 cycles. This innovative offers compelling strategy advancing high‐performance safe metal battery technologies.