Pallasch Sebastian M, Bhosale Manik, Smales Glen J, Schmidt Caroline, Riedel Sibylle, Zhao-Karger Zhirong, Esser Birgit, Dumele Oliver
Department of Chemistry & IRIS Adlershof, Humboldt-Universität zu Berlin, Brook-Taylor-Strasse 2, D-12489 Berlin, Germany.
Institute of Organic Chemistry II and Advanced Materials, Ulm University, Albert-Einstein-Allee 11, D-89081 Ulm, Germany.
J Am Chem Soc. 2024 Jun 26;146(25):17318-17324. doi: 10.1021/jacs.4c04044. Epub 2024 Jun 13.
Covalent organic frameworks (COFs) containing well-defined redox-active groups have become competitive materials for next-generation batteries. Although high potentials and rate performance can be expected, only a few examples of p-type COFs have been reported for charge storage to date with even fewer examples on the use of COFs in multivalent ion batteries. Herein, we report the synthesis of a p-type highly porous and crystalline azatruxene-based COF and its application as a positive electrode material in Li- and Mg-based batteries. When this material is used in Li-based half cells as a COF/carbon nanotube (CNT) electrode, a discharge potential of 3.9 V is obtained with discharge capacities of up to 70 mAh g at a 2 C rate. In Mg batteries using a tetrakis(hexafluoroisopropyloxy)borate electrolyte, cycling proceeds with an average discharge voltage of 2.9 V. Even at a fast current rate of 5 C, the capacity retention amounts to 84% over 1000 cycles.
含有明确氧化还原活性基团的共价有机框架（COF）已成为下一代电池的有竞争力的材料。尽管有望实现高电位和倍率性能，但迄今为止，仅有少数p型COF用于电荷存储的例子，而在多价离子电池中使用COF的例子更少。在此，我们报道了一种p型高孔隙率结晶氮杂苝基COF的合成及其作为锂基和镁基电池正极材料的应用。当该材料在锂基半电池中用作COF/碳纳米管（CNT）电极时，在2 C倍率下可获得3.9 V的放电电位，放电容量高达70 mAh g。在使用四（六氟异丙氧基）硼酸酯电解质的镁电池中，循环过程的平均放电电压为2.9 V。即使在5 C的快速电流倍率下，1000次循环后的容量保持率仍达84%。
