Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa 999078, Macau SAR, China.
Department of Materials Science and Engineering & Center of Super-Diamond and Advanced Films, College of Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon 999077, Hong Kong SAR, China.
ACS Appl Mater Interfaces. 2023 Jun 21;15(24):29032-29041. doi: 10.1021/acsami.3c00905. Epub 2023 Jun 8.
Because of the high safety and environmental friendliness, aqueous zinc-ion batteries have gained a lot of attention in recent years. Prussian blue and its analogues are regarded as a promising cathode material of zinc-ion batteries. Manganese hexacyanoferrate is appropriate among them due to its high operating voltage, large capacity, and cheap price. However, the poor cycling stability of manganese hexacyanoferrate, mainly caused by transition metal dissolution, side reaction, and phase transition, greatly restricts its practical application. In this work, gelatin is used to limit the content of free water in the electrolyte, thus reducing the dissolution effect of transition metal manganese. The introduction of gelatin improves the durability of the Zn anode as well. The optimized MnHCF/gel-0.3/Zn battery displays a high reversible capacity (120 mAh·g at 0.1 A·g), an excellent rate performance (42.7 mAh·g at 2 A·g), and a good capacity retention (65% at 0.5 A·g after 1000 cycles).
由于高安全性和环境友好性，水合锌离子电池近年来受到了广泛关注。普鲁士蓝及其类似物被认为是一种很有前途的锌离子电池阴极材料。其中，亚铁氰化锰由于其高工作电压、大容量和低廉的价格而较为合适。然而，亚铁氰化锰较差的循环稳定性，主要是由于过渡金属溶解、副反应和相转变引起的，极大地限制了其实际应用。在这项工作中，明胶被用来限制电解液中游离水的含量，从而降低过渡金属锰的溶解作用。明胶的引入也提高了 Zn 阳极的耐久性。优化后的 MnHCF/gel-0.3/Zn 电池表现出高可逆容量（在 0.1 A·g 时为 120 mAh·g）、优异的倍率性能（在 2 A·g 时为 42.7 mAh·g）和良好的容量保持率（在 0.5 A·g 下循环 1000 次后保持 65%）。
