气候变化领域集成服务门户(CCPortal): Local spring effect in titanium-based layered oxides

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DOI	10.1039/d0ee02313b
	Local spring effect in titanium-based layered oxides
	Su H.; Guo G.; Ren Y.; Yu X.; Zhang X.; Ma T.; Lu Y.; Zhang Z.; Ma H.; Sui M.; Li H.; Sun C.; Chen Z.; Xu G.; Wang R.; Amine K.; Yu H.
发表日期	2020
ISSN	17545692
起始页码	4371
结束页码	4380
卷号	13 期号:11
英文摘要	Titanium-based layered oxides (TLOs) are one of the most promising electrode material families for sodium-ion batteries (NIBs) due to their smooth charge/discharge profiles and excellent cycle performance. However, the reaction mechanism of these materials, especially the reason for the disappearance of multiple voltage plateaus, is still not clear. Herein, two representative TLOs (Na2/3Ni1/3Ti2/3O2 and Na2/3Co1/3Ti2/3O2) with the same P2 crystal structure have been studied to scrutinize those unexplained issues. In situ synchrotron high-energy X-ray diffraction revealed a solid solution reaction mechanism for both, suggesting the absence of rigid phase transitions upon electrochemical cycling. An interesting "spring effect"of the TiO6 octahedron, i.e., the reversible vibration of the central Ti atom inside the local octahedron upon electrochemical redox, was demonstrated by advanced X-ray absorption spectroscopy and theoretical calculations. Such an effect could suppress the rigid phase transitions, and result in smooth charge/discharge profiles and enhanced cycle stability. This work not only accounts for the disappearance of multiple voltage plateaus of TLOs for NIBs, but also provides an effective local-structure viewpoint to increase the cycle stability of electrode materials for other advanced battery systems. © The Royal Society of Chemistry.
英文关键词	Crystal structure; Electrodes; Metal ions; Sodium-ion batteries; Titanium metallography; X ray absorption spectroscopy; Electrochemical cycling; Electrochemical redox; Electrode material; High energy x-ray diffraction; In-situ synchrotrons; Reaction mechanism; Solid solution reaction; Theoretical calculations; Titanium oxides; crystal structure; electrochemical method; electrode; reaction kinetics; solid solution; titanium; vibration; X-ray diffraction
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/189491
作者单位	Key Laboratory of Advanced Functional Materials, Education Ministry of China, Beijing University of Technology, Beijing, 100124, China; Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, IL 60439, United States; X-ray Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, United States; Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China; Institute of Solid State Microstructure and Properties, Beijing University of Technology Pingleyuan, #100 Chaoyang District, Beijing, 100124, China; Department of Material Science and Engineering, Stanford University, Stanford, CA 94305, United States; Institute for Research and Medical Consultations (IRMC), Imam Abdulrahman Bin Faisal University (IAU), Dammam, 34212, Saudi Arabia
推荐引用方式 GB/T 7714	Su H.,Guo G.,Ren Y.,et al. Local spring effect in titanium-based layered oxides[J],2020,13(11).
APA	Su H..,Guo G..,Ren Y..,Yu X..,Zhang X..,...&Yu H..(2020).Local spring effect in titanium-based layered oxides.Energy & Environmental Science,13(11).
MLA	Su H.,et al."Local spring effect in titanium-based layered oxides".Energy & Environmental Science 13.11(2020).