Novel K-V-Fe Prussian blue analogues nanocubes for high-performance aqueous ammonium ion batteries

• DOI: 10.1016/j.apsusc.2020.148843
• Publication Date: 2020-12-26T15:44:32Z
• Authors: Junjie Xing; Xiuli Fu; Shundong Guan; Yu Zhang; Ming Lei; Zhijian Peng
• Keywords: Prussian blue; Oxalic Acid

Abstract The development of aqueous ammonium ion batteries is currently in its infancy. Searching for suitable electrode materials is one of the most important jobs in preparing high-performance batteries. In this work, we report a one-step hydrothermal method to successfully synthesize novel K-V-Fe Prussian blue analogues nanocubes (PBAs NCs) by using oxalic acid as the reducing agent. The obtained electrode materials effectively combine the high electrochemical activity of vanadium-contained ions with the excellent structural stability of Prussian blue frame, thus ensuring their high capacity for electrochemical energy storage and excellent cycling stability. The optimal K-V-Fe PBAs NCs can achieve a high specific capacity of 92.85 mAh·g−1 at a current density of 2 A·g−1, outstanding cycling stability with a capacity retention of 91.44% (84.9 mAh·g−1) after 2000 cycles at 2 A·g−1 and good rate capability with a specific capacity of 46.2 mAh·g−1 at 5 A·g−1. This strategy of combine vanadium element with open three-dimensional framework provides a new way for selecting and improving electrode materials suitable for electrochemical energy storage. And the present K-V-Fe PBAs NCs will be a promising candidate for aqueous rechargeable ammonium-ion batteries due to their high capacity, reasonable cost and excellent cycling stability.