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- Title
Understanding the Stability for Li-Rich Layered Oxide Li<sub>2</sub>RuO<sub>3</sub> Cathode.
- Authors
Li, Biao; Shao, Ruiwen; Yan, Huijun; An, Li; Zhang, Bin; Wei, Hang; Ma, Jin; Xia, Dingguo; Han, Xiaodong
- Abstract
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 LiNi1/3Co1/3Mn1/3O2) 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.
- Subjects
LITHIUM; OXIDE-coated cathodes; LITHIUM-ion batteries; EXTENDED X-ray absorption fine structure; ELECTRON energy loss spectroscopy; DENSITY functional theory
- Publication
Advanced Functional Materials, 2016, Vol 26, Issue 9, p1330
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.201504836