Co-intercalation of Mg2+ and Na+ in Na0.69Fe2(CN)6 as a High-Voltage Cathode for Magnesium Batteries

• DOI: 10.1021/acsami.6b01352
• Publication Date: 2016-03-11T14:58:48Z
• Authors: Dong-Min Kim; Youngjin Kim; Durairaj Arumugam; Sang Won Woo; Yong Nam Jo; Min-Sik Park; Young-Jun Kim; Nam-Soon Choi; Kyu Tae Lee
• Keywords: 600; 02 engineering and technology; 0210 nano-technology; 01 natural sciences; 7. Clean energy; 0104 chemical sciences

Thanks to the advantages of low cost and good safety, magnesium metal batteries get limelight as substituent for lithium ion batteries. However, energy density state-of-the-art is not high enough because their operating potential; thus, it necessary improve by developing new high-voltage cathode materials. In this study, nanosized Berlin green Fe2(CN)6 Prussian blue Na0.69Fe2(CN)6 are compared materials Interestingly, while Mg2+ ions cannot be intercalated in Fe2(CN)6, shows reversible intercalation deintercalation ions, although they have same crystal structure except presence Na+ ions. This phenomenon attributed fact that more stable Na+-containing than Na+-free indicating plays a crucial role stabilizing delivers capacity approximately 70 mA h g–1 at 3.0 V vs Mg/Mg2+ cycle performance over 35 cycles. Therefore, analogues promising structures Mg Furthermore, co-intercalation effect suggests avenues development hybrid use both charge carriers.