Zhang Dapeng, Sun Lianhang, Wang Changhao, Xue Qing, Feng Jin, Ran Weiguang, Yan Tingjiang
School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China.
ACS Appl Mater Interfaces. 2022 Apr 13;14(14):16197-16203. doi: 10.1021/acsami.2c00143. Epub 2022 Apr 1.
Open-framework structured materials such as Prussian blue analogues and sodium superionic conductor (NASICON) materials have been regarded as promising electrode candidates for aqueous batteries. These materials exhibit outstanding long cycle stability and high rate capacity retention, due to their high ion diffusive rate in the crystal and the stable structure maintenance in the electrochemical reaction process. Herein, an open-framework structured material [Ni(en)][Fe(CN)] (NienHCF) is prepared and first used as a cathode material for aqueous sodium- and potassium-ion batteries. The resultant material exhibits a high output potential and outstanding cycle performance (93.4% after 500 cycles at 1 A g) in K-ion batteries. Meanwhile, the electrochemical reaction mechanism is investigated. After coupling with the activated carbon anode, the K-ion full cell has 91.5% capacity retention at 5 A g and retains 77.2% after 1000 cycles at 0.5 A g, exhibiting the potential as an electrode material for rechargeable aqueous K-ion and Na-ion batteries.
诸如普鲁士蓝类似物和钠超离子导体（NASICON）材料等开放框架结构材料被视为水系电池有前景的电极候选材料。这些材料表现出出色的长循环稳定性和高倍率容量保持率，这归因于它们在晶体中的高离子扩散速率以及在电化学反应过程中稳定的结构维持。在此，制备了一种开放框架结构材料[Ni(en)][Fe(CN)]（NienHCF）并首次用作水系钠离子和钾离子电池的正极材料。所得材料在钾离子电池中表现出高输出电位和出色的循环性能（在1 A g下循环500次后为93.4%）。同时，研究了电化学反应机理。与活性炭负极耦合后，钾离子全电池在5 A g下容量保持率为91.5%，在0.5 A g下循环10,000次后保持77.2%，展现出作为可充电水系钾离子和钠离子电池电极材料的潜力。
