The use of oxide cathodes in Mg batteries would unlock a potential energy storage system that delivers high-energy density. However, poor kinetics of Mg diffusion in known solid oxide lattices strongly limits reversible intercalation, which motivates the sustained exploration of new candidates. Herein, nanocrystals of a few-layer phyllomanganate, reminiscent of the mineral vernadite, were shown to have considerable electrochemical activity toward Mg intercalation at room temperature, where it delivered ∼190 mAh g^–1 at ∼1.9 V (vs Mg/Mg²⁺) in batteries paired with a Mg metal anode. Multimodal characterization confirmed the notable degree of reversible intercalation by probing the structural, compositional, and redox changes undertaken by the oxide. Distinct levels of Mg activity were also observed while varying the content of small amounts of lattice water and the temperature of the reaction. The results reaffirm the prospects for operational Mg batteries using oxide cathodes in moderate conditions, overcoming current limits of performance of this prospective technology.

中文翻译：

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室温下将Mg插入几层苯锰中

在镁电池中使用氧化物阴极可以解锁提供高能量密度的潜在能量存储系统。但是，已知的固体氧化物晶格中Mg扩散动力学较差，强烈限制了可逆插层，这促使人们不断探索新的候选物。在此，几层次锰酸锰的纳米晶体让人想起矿物白云母，它在室温下对Mg嵌入具有相当大的电化学活性，在1.9V时可递送190 mAh g ^–1（vs Mg / Mg ²⁺）与Mg金属阳极配对的电池中）。多峰表征通过探查氧化物所发生的结构，组成和氧化还原变化，证实了可逆插层的显着程度。在改变少量晶格水的含量和反应温度的同时，还观察到了不同水平的镁活性。结果重申了在中等条件下使用氧化物阴极运行镁电池的前景，克服了该预期技术目前的性能极限。