近日,课题组硕士生张景瑞论文“Hydrothermal synthesis of ammonium vanadate [(NH4)2V7O16•3.6H2O] as a promising zinc-ion cathode: Experimental and theoretical study of its storage”被Electrochimica Acta(2021年中科院SCI期刊二区TOP期刊,IF=6.901)接收!
水系锌离子电池在安全、环保的能源存储方面具有很好的应用前景。然而,关键的挑战之一在于探索性能稳定并且具有较高锌离子扩散系数的先进正极材料。该工作采用一种简单的水热法合成了一种新型正极材料(NH4)2V7O16•3.6H2O。通过系统的实验探索和理论研究,揭示了在V7O16层中插入铵离子的结构优越性。电化学性能测试表明,其在0.1A·g-1下具有465mA h g-1的高容量、良好的倍率性能和稳定的循环性能(在5A·g-1下,在1000次循环后容量保持率超过98.4%)。这一工作将为探索锌离子电池或其他金属离子电池高性能的正极材料奠定基础。
Highlights
1. (NH4)2V7O16•3.6H2O with large spacing is prepared by a simple hydrothermal method.
2. The unique structure and phase transition accounts for outstanding Zn2+ storage.
3. The energetically favorable Zn2+ intercalation is confirmed by DFT calculations.
https://www.sciencedirect.com/science/article/pii/S0013468621020685