Potential positive electrodes for high-voltage/high-power magnesium-ion batteries

镁离子电池由于其二价离子的存在和低的氧化还原电位，具有高能量密度和高电动势的联合收割机。然而，据报道，迄今为止，MIB的电池电压不够高（~ 1. 5V），远低于锂离子电池（LIB）（4？5 V）。在这项工作中，我们已经调查了潜在的镁？什么？O和Mg？倪？O复合氧化物作为MIB的正极，其由这些正极和Mg负极组成，在乙腈中，以Mg（ClO 4）2盐作为电解质。这些MIB可以表现出相对高的开路电压OCV。然而，由于乙腈电解质和金属Mg的组合可以在Mg电极的表面上产生钝化，我们还检查了这些材料用于完善的Li离子电池系统，并确认充电的电池可以显示高OCV。为了获得如此高的电池电压，利用主体复合氧化物中充电后的不稳定离子将是重要的。

Magnesium-ion batteries(MIBs) with a Mg-metal negative electrode are expected to combine high energy density and high electromotive force, owing to the divalent ion careers and its low redox potential. However, it has been reported to date that the cell voltage of MIBs is not high enough(~ 1. 5 V), being far below that of lithium-ion batteries(LIBs)(4? 5 V). In this work, we have investigated the potentiality of Mg? Co? O and Mg? Ni? O complex oxides as the positive electrode for MIBs, which are composed of these positive electrodes and a Mg negative electrode in acetonitrile with Mg(ClO4) 2 salt as an electrolyte. These MIBs can exhibit a relatively high open circuit voltage, OCV. However, as the combination of the acetonitrile electrolyte and metal Mg can yield the passivation on the surface of the Mg electrode, we have also checked these materials for a well-established Li ion battery system, and confirmed that the charged battery can show high OCV. In order to attain such a high cell voltage, it would be significant to exploit the unstabilized ionafter charge in the host complex oxide.