Jiangsu Key Laboratory of Electrochemical Energy Storage Technologies, College of Materials Science and Technologies, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, P. R. China.
Department of Chemistry and Materials Science, College of Science, Nanjing Forestry University, Nanjing, 210037, P. R. China.
Chemistry. 2023 May 22;29(29):e202300424. doi: 10.1002/chem.202300424. Epub 2023 Apr 11.
Given these advantages of widely designable structures and environmentally friendly characteristics, organic electrode materials (OEMs) are considered to be promising electrode materials for alkaline metal-ion batteries. However, their large-scale application is hampered by insufficient specific capacity and rate performance. Here, Fe is coupled to the anhydride molecule NTCDA to form a novel K-storage anode Fe-NTCDA. In this way, the working potential of Fe-NTCDA anode is reduced, which makes it more suitable to be used as an anode material. Meanwhile, the electrochemical performance is significantly improved due to the increase in K-storage sites. Moreover, electrolytes regulation is implemented to optimize the K-storage behavior, resulting into a high specific capacity of 167 mAh/g after 100 cycles at 50 mA/g and 114 mAh/g even at 500 mA/g in the 3 M KFSI/DME electrolytes.
鉴于结构设计灵活和环境友好的特点，有机电极材料（OEMs）被认为是有前途的碱性金属离子电池的电极材料。然而，其大规模应用受到比容量和倍率性能不足的限制。在这里，Fe 与酐分子 NTCDA 结合，形成了一种新型的 K 存储阳极 Fe-NTCDA。通过这种方式，降低了 Fe-NTCDA 阳极的工作电位，使其更适合用作阳极材料。同时，电化学性能得到显著提高，这是由于 K 存储位点的增加。此外，通过电解质调节来优化 K 存储行为，在 3 M KFSI/DME 电解质中，在 50 mA/g 下循环 100 次后，比容量高达 167 mAh/g，即使在 500 mA/g 下，比容量仍高达 114 mAh/g。
