Development of al‐doped MgMn₂O₄‐based cathode materials for magnesium ion cells

Abstract

Magnesium ion battery is an alternative for secondary battery instead of lithium ion battery due to its advantages of low cost, safety and environment friendly. Magnesium (Mg) is safer compared to lithium (Li) where it has high stability in contact of air and prevent the formation of dendrites during electrochemical cycling. The cathode materials of un‐doped MgMn2O4 and Al‐doped MgMn2‐xAlxO4, x = .01, .02, .03 were prepared using self‐propagating combustion method with triethanolamine fuel as a reducing agent. All samples (powder form) were annealed at 700˚C in 6 h based on the thermogravimetric analysis results. The samples were been characterized using X ray diffraction, field emission electron microscopy, energy‐dispersive X‐ray spectroscopy and high‐resolution transmission electron microscopy to study structural and morphological properties of the samples. Electrochemical properties of linear sweep voltammetry, cyclic voltammetry, and charge‐discharge capacity were performed in 1 M Magnesium Trifluoromethanesulfonate (MgTf2) with ratio 1:1 of ethylene carbonate: dimethyl ether electrolyte. The discharge capacity of magnesium ion cells using Al‐doped cathode material showed the improvement of 68% compared to the un‐doped sample.