Zhang Yan, Li Min, Li Zongyang, Lu Yongyi, Li Houmou, Liang Jiaxin, Hu Xinyu, Zhang Libin, Ding Kun, Xu Qunjie, Liu Haimei, Wang Yonggang
Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, College of Environmental and Chemical Engineering, Shanghai University of Electric Power, 200090, Shanghai, China.
Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, Fudan University, 200433, Shanghai, China.
Angew Chem Int Ed Engl. 2024 Nov 25;63(48):e202410342. doi: 10.1002/anie.202410342. Epub 2024 Oct 24.
P-type organic cathode materials typically exhibit high redox potentials and fast redox kinetics, presenting broad application prospects in aqueous zinc batteries (AZBs). However, most of the reported p-type organic cathode materials exhibit limited capacity (<100 mAh g), which is attributable to the low mass content ratio of oxidation-reduction active functional groups in these materials. Herein, we report a high-capacity p-type organic material, 5,12-dihydro-5,6,11,12-tetraazatetracene (DHTAT), for aqueous zinc batteries. Both experiments and calculation indicate the charge storage of DHTAT mainly involves the adsorption/desorption of ClO on the -NH- group. Benefitting from the high mass content ratio of the -NH- group in DHATA molecule, the DHATA electrode demonstrates a remarkable capacity of 224 mAh g at a current density of 50 mA g with a stable voltage of 1.12 V. Notably, after 5000 cycles at a high current density of 5 A g, DHTAT retains 73 % of its initial capacity, showing a promising cycling stability. In addition, DHTAT also has good low-temperature performance and can stably cycle at -40 °C for 4000 cycles at 1 A g, making it a competitive candidates cathode material for low-temperature batteries.
P型有机正极材料通常具有高氧化还原电位和快速的氧化还原动力学，在水系锌电池（AZB）中展现出广阔的应用前景。然而，大多数已报道的P型有机正极材料容量有限（<100 mAh g），这归因于这些材料中氧化还原活性官能团的质量含量比低。在此，我们报道了一种用于水系锌电池的高容量P型有机材料5,12-二氢-5,6,11,12-四氮杂并四苯（DHTAT）。实验和计算均表明，DHTAT的电荷存储主要涉及ClO在-NH-基团上的吸附/解吸。受益于DHTA分子中-NH-基团的高质量含量比，DHTA电极在50 mA g的电流密度下表现出224 mAh g的显著容量，稳定电压为1.12 V。值得注意的是，在5 A g的高电流密度下循环5000次后，DHTAT保留了其初始容量的73%，显示出良好的循环稳定性。此外，DHTAT还具有良好的低温性能，在-40°C下以1 A g的电流密度可稳定循环4000次，使其成为低温电池中有竞争力的正极材料候选者。
