S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Chemical and Biological Engineering (화학생물공학부) Journal Papers (저널논문_화학생물공학부)
Co-intercalation of Mg2+ and Na+ in Na0.69Fe2(CN)(6) as a high-voltage cathode for magnesium batteries
- Kim, Dong-Min; Kim, Youngjin; Arumugam, Durairaj; Woo, Sang Won; Jo, Yong Nam; Park, Min-Sik; Kim, Young-Jun; Choi, Nam-Soon; Lee, Kyu Tae
- Issue Date
- ACS Applied Materials and Interfaces, Vol.8 No.13, pp.8554-8560
- magnesium battery; Prussian blue analogue; cathode; electrochemical performance; electrochemistry
- Thanks to the advantages of low cost and good safety, magnesium metal batteries get the limelight as substituent for lithium ion batteries. However, the energy density of state-of-the-art magnesium batteries is not high enough because of their low operating potential; thus, it is necessary to improve the energy density by developing new high-voltage cathode materials. In this study, nanosized Berlin green Fe-2(CN)(6) and Prussian blue Na0.69Fe2(CN)(6) are compared as high-voltage cathode materials for magnesium batteries. Interestingly, while Mg2+ ions cannot be intercalated in Fe-2(CN)(6), Na0.69Fe2(CN)(6) shows reversible intercalation and deintercalation of Mg2+ ions, although they have the same crystal structure except for the presence of Na+ ions. This phenomenon is attributed to the fact that Mg2+ ions are more stable in Nat-containing Na0.69Fe2(CN)(6) than in Na+-free Fe-2(CN)(6), indicating Nat ions in Na0.69Fe2(CN)(6) plays a crucial role in stabilizing Mg2+ ions. Na0.69Fe2(CN)(6) delivers reversible capacity of approximately 70 mA h g(-1) at 3.0 V vs Mg/Mg2+ and shows stable cyde performance over 35 cycles. Therefore, Prussian blue analogues are promising structures for high-voltage cathode materials in Mg batteries. Furthermore, this co-intercalation effect suggests new avenues for the development of cathode materials in hybrid magnesium batteries that use both Mg2+ and Na+ ions as charge carriers.
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