Integrated covalent organic framework/carbon nanotube composite as Li‐ion positive electrode with ultra-high rate performance

Gao, Hui and Zhu, Qiang and Neale, Alex R. and Bahri, Mounib and Wang, Xue and Yang, Haofan and Liu, Lunjie and Clowes, Rob and Browning, Nigel D. and Sprick, Reiner Sebastian and Little, Marc A. and Hardwick, Laurence J. and Cooper, Andrew I. (2021) Integrated covalent organic framework/carbon nanotube composite as Li‐ion positive electrode with ultra-high rate performance. Advanced Energy Materials, 11 (39). 2101880. ISSN 1614-6832 (https://doi.org/10.1002/aenm.202101880)

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Abstract

Covalent organic frameworks (COFs) are promising electrode materials for Li-ion batteries. However, the utilization of redox-active sites embedded within COFs is often limited by the low intrinsic conductivities of bulk-grown material, resulting in poor electrochemical performance. Here, a general strategy is developed to improve the energy storage capability of COF-based electrodes by integrating COFs with carbon nanotubes (CNT). These COF composites feature an abundance of redox-active 2,7-diamino-9,10-phenanthrenequinone (DAPQ) based motifs, robust β‑ketoenamine linkages, and well-defined mesopores. The composite materials (DAPQ-COFX—where X = wt% of CNT) are prepared by in situ polycondensation and have tube-type core-shell structures with intimately grown COF layers on the CNT surface. This synergistic structural design enables superior electrochemical performance: DAPQ-COF50 shows 95% utilization of redox-active sites, long cycling stability (76% retention after 3000 cycles at 2000 mA g−1), and ultra-high rate capability, with 58% capacity retention at 50 A g−1. This rate translates to charging times of ≈11 s (320 C), implying that DAPQ-COF50 holds excellent promise for high-power cells. Furthermore, the rate capability outperformed all previous reports for carbonyl-containing organic electrodes by an order of magnitude; indeed, this power density and the rapid (dis)charge time are competitive with electrochemical capacitors.

  • Item type:Article
    ID code:77898
    Dates:
    Date
    Event
    21 October 2021
    Published
    12 September 2021
    Published Online
    18 August 2021
    Accepted
    Subjects:Science > Chemistry
    Department:Faculty of Science > Pure and Applied Chemistry
    Depositing user: Pure Administrator
    Date deposited:23 Sep 2021 15:16
    Last modified:11 Apr 2024 02:18
    URI:https://strathprints.strath.ac.uk/id/eprint/77898
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