Understanding the Stability for Li‐Rich Layered Oxide Li2RuO3 Cathode,Advanced Functional Materials

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Understanding the Stability for Li‐Rich Layered Oxide Li2RuO3 Cathode
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2016-02-08 , DOI: 10.1002/adfm.201504836
Biao Li ₁ , Ruiwen Shao ₂ , Huijun Yan ₁ , Li An ₁ , Bin Zhang ₂ , Hang Wei ₁ , Jin Ma ₁ , Dingguo Xia ₁ , Xiaodong Han ₂

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Lithium‐rich layered oxides are considered as promising cathode materials for Li‐ion batteries with high energy density due to their higher capacity as compared with the conventional LiMO₂ (e.g., LiCoO₂, LiNiO₂, and LiNi_1/3Co_1/3Mn_1/3O₂) layered oxides. However, why lithium‐rich layered oxides exhibit high capacities without undergoing a structural collapse for a certain number of cycles has attracted limited attention. Here, based on the model of Li₂RuO₃, it is uncovered that the mechanism responsible for the structural integrity shown by lithium‐rich layered oxides is realized by the flexible local structure due to the presence of lithium atoms in the transition metal layer, which favors the formation of O₂²⁻‐like species, with the aid of in situ extended X‐ray absorption fine structure (EXAFS), in situ energy loss spectroscopy (EELS), and density functional theory (DFT) calculation. This finding will open new scope for the development of high‐capacity layered electrodes.

中文翻译：

了解富含Li的层状氧化物Li2RuO3阴极的稳定性

富含锂的层状氧化物由于具有比常规LiMO ₂（例如LiCoO ₂，LiNiO ₂和LiNi _1/3 Co _1/3的更高的容量）而被认为是具有高能量密度的锂离子电池的有前途的正极材料Mn _1/3 O ₂）层状氧化物。但是，为什么富含锂的层状氧化物表现出高容量而在一定数量的循环中不会发生结构塌陷，却引起了有限的关注。这里，基于Li ₂ RuO ₃的模型，它揭露了负责由富锂层状氧化物中示出的结构完整性的机制由所述柔性局部结构由于锂原子的过渡金属层的存在，这有利于的O的形成实现₂^2-样物种，借助原位扩展X射线吸收精细结构（EXAFS），原位能量损失光谱（EELS）和密度泛函理论（DFT）计算。这一发现将为高容量分层电极的开发开辟新的领域。

更新日期：2016-02-08

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