Fe Incorporated Near-Amorphous Mn Oxide for Mg Rechargeable Batteries
In this study, Fe incorporated Mn oxide was synthesized via simple cost-effective co-precipitation method. Unlike the preceded studies, crystalline nature of the obtained material was near-amorphous. As given in Figure 1(a), every sample synthesized via co-precipitation method exhibited an amorphous nature. For optimization of electrochemical performance, Fe addition amount was controlled from 0.1 M to 0.3 M. Each sample was galvanostatically cycled from 1 V to 4 V vs. Mg in 0.5 M Mg(ClO4)2in propylene carbonate.
Figure 1(b) shows the voltage profile at 1st cycle of no Fe contained, 0.1 M, 0.2 M and 0.3 M added sample. The capacity of 0.3 M added Fe (Best result) increased 33% with 91% coulombic efficiency compared to no Fe added oxide. Also, the charging potential showed a difference of 0.23V between no Fe added and 0.3 M Fe added sample. It is attributed to the pillar effect4 which supports the oxide structure during cycling.
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