biostudies-literatureLiu SFundamental Research Funds for the Central UniversitiesFunds for Chongqing Talents PlanNational Natural Science Foundation of Chinae05311https://www.ebi.ac.uk/biostudies/studies/S-EPMC12376503biostudies-literatureUnknown12(31)Covalent organic frameworks (COFs) have emerged as promising electrode materials for sodium-ion batteries (SIBs) due to their well-ordered porous structures that facilitate ion storage and transport. However, conventional 2D and 3D COFs often require post-processing, such as ball milling or carbon compositing, to enhance electrochemical performance. In this study, a 1D imine-linked COF, N,N,N',N'-Tetrakis(4-aminophenyl)-1,4-phenylenediamine-2,6-pyridinedicarboxaldehyde (TP-PDA), is synthesized via a one-step Schiff base reaction, achieving a fully conjugated and porous structure that enables efficient sodium-ion transport. TP-PDA is insoluble in organic electrolytes, ensuring stable cycling performance. The material exhibits a high average discharge potential of 3.1 V and delivers a discharge capacity of 124 mAh g^-1 at 3 A g^-1 after 1800 cycles, with a capacity retention exceeding 90%. In a full-cell configuration with a hard carbon anode, the battery maintains a stable capacity of 122 mAh g^-1 after 10 000 cycles at 1 A g^-1 without noticeable capacity degradation. Furthermore, the flexible pouch cell retains its electrochemical integrity under bending conditions, demonstrating its potential for flexible and wearable energy storage applications.Advanced science (Weinheim, Baden-Wurttemberg, Germany)High Voltage Flexible Sodium-Ion Battery Cathode Materials Based on 1D Covalent Organic Framework.PMC123765032021CDJQY‐027522060892021CDJQY-027CQYC2021059563Sun MLeung PWalsh FCZuo YLiao QLiu SZhao TWei LfalseHigh Voltage Flexible Sodium-Ion Battery Cathode Materials Based on 1D Covalent Organic Framework.Covalent organic frameworks (COFs) have emerged as promising electrode materials for sodium-ion batteries (SIBs) due to their well-ordered porous structures that facilitate ion storage and transport. However, conventional 2D and 3D COFs often require post-processing, such as ball milling or carbon compositing, to enhance electrochemical performance. In this study, a 1D imine-linked COF, N,N,N',N'-Tetrakis(4-aminophenyl)-1,4-phenylenediamine-2,6-pyridinedicarboxaldehyde (TP-PDA), is synthesized via a one-step Schiff base reaction, achieving a fully conjugated and porous structure that enables efficient sodium-ion transport. TP-PDA is insoluble in organic electrolytes, ensuring stable cycling performance. The material exhibits a high average discharge potential of 3.1 V and delivers a discharge capacity of 124 mAh g^-1 at 3 A g^-1 after 1800 cycles, with a capacity retention exceeding 90%. In a full-cell configuration with a hard carbon anode, the battery maintains a stable capacity of 122 mAh g^-1 after 10 000 cycles at 1 A g^-1 without noticeable capacity degradation. Furthermore, the flexible pouch cell retains its electrochemical integrity under bending conditions, demonstrating its potential for flexible and wearable energy storage applications.2025-01-01T00:00:00Z2025 Aug2026-05-09T17:49:41.977Z2026-04-08T01:08:40.228ZS-EPMC123765034054846410.1002/advs.202505311