P2-Na0.6[Cr0.6Ti0.4]O2 cation-disordered electrode for high-rate symmetric rechargeable sodium-ion batteries.
P2-Na0.6[Cr0.6Ti0.4]O2 cation-disordered electrode for high-rate symmetric rechargeable sodium-ion batteries.
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高倍率对称可充电钠离子电池用P2-Na-0.6[Cr0.6Ti0.4]O-2阳离子无序电极
DOI：
10.1038/ncomms7954
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发表时间：
2015-04-24
影响因子：
16.6
通讯作者：
Chen, Liquan
中科院分区：
文献类型：
--
作者：
Wang, Yuesheng;Xiao, Ruijuan;Hu, Yong-Sheng;Avdeev, Maxim;Chen, Liquan
由于碱金属层中强的Na+-Na+相互作用和过渡金属层中的电荷有序，大多数P2型层状氧化物表现出Na+/空位有序超结构。电化学曲线中的电压平台所证明的这些超结构限制了可再充电电池中的Na+离子传输动力学和循环性能。在这里，我们表明，这样的Na+/空位排序可以避免通过选择具有相似的离子半径和不同的氧化还原电位的过渡金属离子，例如，Cr 3+和Ti 4+。所设计的P2-Na0.6[Cr0.6Ti0.4]O2在任何钠含量下都是完全Na+/空位无序的，并且显示出优异的倍率性能和长循环寿命。使用相同的P2-Na0.6[Cr0.6Ti0.4]O2电极的对称钠离子电池在12 C倍率下提供初始容量的75%。我们的贡献表明，通过打破过渡金属层中的电荷有序来防止Na+/空位有序的方法为设计具有高功率密度和长循环寿命的无序电极材料开辟了一条简单的途径。 含钠层状氧化物是有前途的电池阴极，但其性能受到钠离子空位有序超结构形成的影响。在这里，作者提出了一种具有无序阳离子的P2-Na0.6[Cr0.6Ti0.4]O2层状氧化物，从而获得高电池性能。
Most P2-type layered oxides exhibit Na+/vacancy-ordered superstructures because of strong Na+–Na+ interaction in the alkali metal layer and charge ordering in the transition metal layer. These superstructures evidenced by voltage plateaus in the electrochemical curves limit the Na+ ion transport kinetics and cycle performance in rechargeable batteries. Here we show that such Na+/vacancy ordering can be avoided by choosing the transition metal ions with similar ionic radii and different redox potentials, for example, Cr3+ and Ti4+. The designed P2-Na0.6[Cr0.6Ti0.4]O2 is completely Na+/vacancy-disordered at any sodium content and displays excellent rate capability and long cycle life. A symmetric sodium-ion battery using the same P2-Na0.6[Cr0.6Ti0.4]O2 electrode delivers 75% of the initial capacity at 12C rate. Our contribution demonstrates that the approach of preventing Na+/vacancy ordering by breaking charge ordering in the transition metal layer opens a simple way to design disordered electrode materials with high power density and long cycle life. Sodium-containing layered oxides are promising battery cathodes, but their performance suffers from the formation of sodium ion-vacancy ordered superstructures. Here, the authors present a P2-Na0.6[Cr0.6Ti0.4]O2 layered oxide with disordered cations, leading to high battery performance.
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