Redox-Bipolar Covalent Organic Framework Cathode for Advanced Sodium-Organic Batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 39529539.
- Also identified by DOI 10.1002/adma.202411625.
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Abstract
Redox-active covalent organic frameworks (COFs) are promising candidates for sodium-ion batteries (SIBs). However, the construction of redox-bipolar COFs with the anions and cations co-storage feature for SIBs is rarely reported. Herein, redox-bipolar COF constructed from aniline-fused quinonoid units (TPAD-COF) is developed as the cathode material in SIBs for the first time. The unique integration of conductive aniline skeletons and quinone redox centers endows TPAD-COF with high ionic/electrical conductivity, abundant redox-active sites, and fascinating bipolar features. Consequently, the elaborately tailored TPAD-COF cathode exhibits higher specific capacity (186.4 mAh g<sup>-1</sup> at 0.05 A g<sup>-1</sup>) and superior cycling performance (over 2000 cycles at 1.0 A g<sup>-1</sup> with 0.015% decay rate per cycle). Impressively, TPAD-COF also displays a high specific capacity of 101 mAh g<sup>-1</sup> even at -20 °C. As a proof of concept, all-organic SIBs (AOSIBs) are assembled using TPAD-COF cathode and disodium terephthalate anode, which also show impressive electrochemical properties, indicating the potential application of TPAD-COF cathode in AOSIBs. The work will pave the avenue toward advanced COFs cathode for rechargeable batteries through rational molecular design.