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Iodine doping induced activation of covalent organic framework cathodes for Li-ion batteries† † Electronic supplementary information (ESI) available. See DOI: https://doi.org/10.1039/d3ra01414b

ABSTRACT: Covalent organic frameworks (COFs) are considered as promising candidate organic electrode materials for lithium-ion batteries (LIBs) because of their relatively high capacity, ordered nanopores, and limited solubility in electrolyte. However, the practical capacity of COF materials is mainly affected by their low electronic/ionic conductivity and the deep-buried active sites inside the COFs. Here, we synthesize an iodine doped β-ketoenamine-linked COF (2,6-diaminoanthraquinone and 1,3,5-triformylphloroglucinol, denoted as COF-I) by a facile one-pot solvothermal reaction. The introduction of iodine can make the COF more lithiophilic inside and exhibit high intrinsic ion/electron transport, ensuring more accessible active sites of the COFs. Consequently, when used as the cathode of LIBs, COF-I demonstrates a high initial discharge capacity of 140 mA h g−1 at 0.2 A g−1, and excellent cycling stability with 92% capacity retention after 1000 cycles. Furthermore, a reversible capacity of 95 mA h g−1 at 1.0 A g−1 is also achieved after 300 cycles. Our study provides a facile way to develop high-performance COF electrode materials for LIB applications. An iodine doping flower-like DAAQ-based COF was prepared by a facile one-pot solvothermal reaction. The prepared COF-I exhibited high intrinsic ion/electron transport and electrochemical performance for Li-ion batteries.

SUBMITTER: Ren G

PROVIDER: S-EPMC10286563 | biostudies-literature | 2023 Jun

REPOSITORIES: biostudies-literature

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