Abstract
The catalytic activity of the spinel oxide for the oxidative electrolyte decomposition depends on the valence band maximum (VBM) of the spinel oxide. The lower the VBM, the higher the potential at which the oxidative electrolyte decomposition starts.
Highlights
The demand for rechargeable batteries with high energy density has increased because the markets for longrange electric vehicles and high-performance mobile devices have expanded
We used experimental data and calculations to demonstrate that the catalytic activity for oxidative electrolyte decomposition was correlated with the valence band maximum (VBM) of spinel oxides; that is, low VBMs were correlated with high overpotentials for oxidative electrolyte decomposition
The cyclic voltammogram of a cell featuring a Pt plate as the working electrode (WE), a Mg ribbon as the counter electrode (CE), Ag/Ag+ as the reference electrode (RE), and a 0.5 M [Mg(G4)][TFSA]2/[Pyr1,3][TFSA] solution as the electrolyte was obtained at 100 C and a scan rate of 10 mV sÀ1 in the potential range of À3.6 to 1.4 V vs. Ag/Ag+ (Fig. 2a)
Summary
The demand for rechargeable batteries with high energy density has increased because the markets for longrange electric vehicles and high-performance mobile devices have expanded. The overpotential and kinetics of oxidative electrolyte decomposition significantly depend on the transition metal ion in spinel oxides (e.g., MgMn2O4, MgFe2O4, or MgCo2O4) used as positive electrode active materials.
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