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Synthesis and electrochemical study of Mg1.5MnO3: A defect spinel cathode for rechargeable magnesium battery
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DOI：10.1016/j.mseb.2015.08.008.png)
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Abstract
En 中文
Mg1.5MnO3, a defect oxide spinel (space group: Fd3m; unit cell: 0.833294 nm) of particle size similar to 100 nm derived by the Pechini route was tested as a cathode for rechargeable magnesium battery. Cyclic voltammetry illustrates a reversible reaction occurring in the 0.3-2.0 V potential window versus magnesium. The spinel however exhibits a low capacity of similar to 12.4 mAh/g up to 20 cycle when cycled at a current rate of similar to C/27. X-ray photoelectron spectroscopy surface probe of magnesiated/de-magnesiated electrodes confirms the oxidation state change of Mn during intercalation/de-intercalation of Mg-ion from the Mg1.5MnO3 electrode. The low capacity of Mg1.5MnO3 electrode mainly stem from the kinetic limitation of Mg-ion removal from the defect oxide spinel as the electrochemical impedance spectroscopy results of electrodes show that charge transfer resistance, R-e increases in the de-magnesiated state. (C) 2015 Elsevier B.V. All rights reserved.
Keywords:
Magnesium
Defect oxide spinel
Nanocrystalline materials
Electrochemistry
X-ray photoelectron spectroscopy
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