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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >A novel P3-type Na2/3Mg1/3Mn2/3O2 as high capacity sodium-ion cathode using reversible oxygen redox
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A novel P3-type Na2/3Mg1/3Mn2/3O2 as high capacity sodium-ion cathode using reversible oxygen redox

机译:一种新的P3型NA2 / 3MG1 / 3MN2 / 3O2,使用可逆氧氧化还原为高容量钠离子阴极

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摘要

There is great interest in the discovery of Li/Na-ion cathode materials with capacity exceeding the limitation of conventional intercalation-based oxide cathodes. One plausible but challenging path is to reversibly use the charge compensation of both lattice oxygen redox and transition metal (TM) redox. Here, we report that lattice oxygen redox alone contributes over 190 mA h g(-1) charge capacity (cut-off at 4.65 V vs. Na+/Na) for the newly synthesized P3-type Na2/3Mg1/3Mn(IV) 2/3O(2). Similar amounts of discharge capacity are reversibly achieved. The discharge capacity exceeds 220 mA h g(-1) when Mn3+/Mn4+ redox is partially used in addition to the oxygen redox reaction. This represents one of the highest energy density sodium-ion cathodes with superior low-cost. Our results reveal that cations with strong ionic bonding nature with oxygen (such as Mg2+) are very effective in inducing the reversible oxygen redox reaction. We also identified the origin of voltage hysteresis to be a P3-to-O3 phase transition in concomitance with Mg2+ migration, suggesting further structure design that reduces the structure transition induced cation migration is critical for increasing the energy efficiency of the oxygen redox reactions.
机译:对Li / Na离子阴极材料的发现具有很大的兴趣,其容量超过常规嵌入氧化物阴极的限制。一个合理但具有挑战性的路径是可逆地使用格子氧氧化还原和过渡金属(TM)氧化还原的电荷补偿。在这里,我们报告了单独的晶格氧氧化还原有助于新合成的P3型NA2 / 3mg1 / 3Mn(IV)2 /的190 mA Hg(-1)电荷容量(4.65V与Na + / Na)的贡献3o(2)。相似的放电容量是可逆的。除氧氧化还原反应外,放电容量超过220mA hg(-1)。除氧氧化还原反应外,部分地使用MN3 + / MN4 +氧化还原。这表示具有优异的低成本的最高能量密度钠离子阴极之一。我们的研究结果表明,具有氧气强的离子粘合性质(如Mg2 +)的阳离子在诱导可逆氧氧化还原反应方面非常有效。我们还确定了电压滞后的起源,以伴随MG2 +迁移,达到P3-o-O3相转变,表明降低结构过渡诱导的阳离子迁移的进一步结构设计对于增加氧氧化还原反应的能量效率至关重要。

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