| 초록 |
Aqueous zinc ion batteries (AZIBs), composed of a zinc (Zn) metal anode paired with a metal oxide cathode, are promising candidates for post lithium ion batteries. The bivalence of Zn opens up possibilities for multi-electron redox, which has spurred a fierce search for suitable cathode materials (namely metal oxides) that intercalate Zn2+ ions. Despite the recent rise in publications, however, little is known about the intercalation dynamics of Zn2+ ions. As such, there is much room to explore the interaction between these ions and their host cathode. In this respect, we focus on a type of vanadium oxide, V6O13, not only as an electrochemically promising material, but also as a platform with which key Zn2+ intercalation parameters can be elucidated. Electrochemical results are correlated with a series of synchrotron XAFS/XRD studies along with DFT calculations to understand the underlying reaction mechanisms. Interestingly, we find that 'hydrated intercalation' is crucial to facilitating Zn2+ intercalation kinetics. In this talk, I will correlate the electrochemical properties with the structural changes of the cathode and explain how water comes into play during this process. |
