Liang Guojin, Wang Yanlei, Huang Zhaodong, Mo Funian, Li Xinliang, Yang Qi, Wang Donghong, Li Hongfei, Chen Shimou, Zhi Chunyi
Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, China.
Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China.
Adv Mater. 2020 Apr;32(14):e1907802. doi: 10.1002/adma.201907802. Epub 2020 Feb 20.
Nonmetallic ammonium (NH ) ions are applied as charge carriers for aqueous batteries, where hexagonal MoO is initially investigated as an anode candidate for NH storage. From experimental and first-principle calculated results, the battery chemistry proceeds with reversible building-breaking behaviors of hydrogen bonds between NH and tunneled MoO electrode frameworks, where the ammoniation/deammoniation mechanism is dominated by nondiffusion-controlled pseudocapacitive behavior. Outstanding electrochemical performance of MoO for NH storage is delivered with 115 mAh g at 1 C and can retain 32 mAh g at 150 C. Furthermore, it remarkably exhibits ultralong and stable cyclic performance up to 100 000 cycle with 94% capacity retention and high power density of 4170 W kg at 150 C. When coupled with CuFe prussian blue analogous (PBA) cathode, the full ammonium battery can deliver decent energy density 21.3 Wh kg and the resultant flexible ammonium batteries at device level are also pioneeringly developed for potential realistic applications.
非金属铵（NH ）离子被用作水系电池的电荷载体，其中六方相MoO最初被研究作为储铵的阳极候选材料。从实验和第一性原理计算结果来看，电池化学反应过程伴随着NH 与隧道状MoO电极框架之间氢键的可逆破坏行为，其中氨化/脱氨机制主要由非扩散控制的赝电容行为主导。MoO用于储铵展现出出色的电化学性能，在1 C时为115 mAh g ，在150 C时可保持32 mAh g 。此外，它在高达100 000次循环时显著展现出超长且稳定的循环性能，容量保持率为94%，在150 C时具有4170 W kg 的高功率密度。当与铜铁普鲁士蓝类似物（PBA）阴极耦合时，全铵电池可提供21.3 Wh kg 的良好能量密度，并且还开创性地开发了器件级的柔性铵电池以用于潜在的实际应用。
