Both electrochemically and chemically delithiated layered rock-salt LixNi0.5Mn0.5O2 were successfully synthesized to investigate their crystal structures and cathode properties in the Mg rechargeable batteries. While the electrochemically delithiated LixNi0.5Mn0.5O2 (x = 0.1 or 0.5) showed reversible behavior only two cycles in a Mg cell with subphase after initial discharge, the chemically delithiated Li0.45Ni0.5Mn0.5O2 delivered a discharge capacity of 175 mAh g−1 with an average potential of 2.4 V vs Mg/Mg2+ during several cycles. The chemically delithiated structure with x = 0.45 was found to be able to intercalate Mg ions according to the Rietveld analysis for synchrotron XRD patterns and XANES spectra for discharged electrode. It was concluded that the chemically delithiated Li0.45Ni0.5Mn0.5O2 provided the favored structure for Mg intercalation due to the appropriate interlayer distance.

中文翻译：

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化学和电化学脱锂的 Li _x Ni _0.5 Mn _0.5 O _{2 的}晶体结构和阴极特性及其在镁可充电电池中的应用

成功合成了电化学和化学脱锂层状岩盐 LixNi0.5Mn0.5O2，以研究它们在镁可充电电池中的晶体结构和阴极性能。虽然电化学脱锂的 LixNi0.5Mn0.5O2（x = 0.1 或 0.5）在具有亚相的镁电池中在初始放电后仅显示两个循环的可逆行为，但化学脱锂的 Li0.45Ni0.5Mn0.5O2 提供了 175 mAh g 的放电容量-1 与 Mg/Mg2+ 在几个循环中的平均电位为 2.4 V。根据同步加速器 XRD 图案的 Rietveld 分析和放电电极的 XANES 光谱，发现 x = 0.45 的化学脱锂结构能够嵌入 Mg 离子。得出的结论是化学脱锂的 Li0.45Ni0.5Mn0。