Probing thermally-induced structural evolution during the synthesis of layered Li-, Na-, or K-containing 3d transition-metal oxides

作     者：Weibo Hua Xiaoxia Yang Nicola PMCasati Laijun Liu Suning Wang Volodymyr Baran Michael Knapp Helmut Ehrenberg Sylvio Indris Weibo Hua;Xiaoxia Yang;Nicola P.M.Casati;Laijun Liu;Suning Wang;Volodymyr Baran;Michael Knapp;Helmut Ehrenberg;Sylvio Indris

作者机构：School of Chemical Engineering and TechnologyXi'an Jiaotong UniversityXi'anShaanxi710049China Institute for Applied Materials(IAM)Karlsruhe Institute of Technology(KIT)Hermann-von-Helmholtz-Platz 1D-76344Eggenstein-LeopoldshafenGermany College of Materials Science and EngineeringGuilin University of TechnologyGuilin541004China Paul Scherrer Institut(PSI)WLGA/2295232Villigen PSISwitzerland Deutsches Elektronen-Synchrotron(DESY)Notkestr.85Hamburg22607Germany 

出 版 物：《eScience》 (电化学与能源科学（英文）)

年 卷 期：2022年第2卷第2期

页      面：183-191页

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 070301[理学-无机化学] 

基　　金：the National Natural Science Foundation of China(grant no.22108218) “Young Talent Support Plan”of Xi'an Jiaotong University(71211201010723) This work was financially supported by the China Postdoctoral Science Foundation(Grant No.2021M693813) Guangxi Science and Technology Base and Talents Special Project(Grant No.AD21159007) the Natural Science Foundation of Guangxi(Grant No.2020GXNSFBA297029) the Foundation of Key Laboratory of New Processing Technology for Nonferrous Metal&Materials,Ministry of Education/Guangxi Key Laboratory of Optical and Electronic Materials and Devices,Guilin University of Technology(Contract No.20AA-13) the Foundation of Guilin University of Tech-nology(GLUTQDJJ2020003) High Level Innovation Team and Outstanding Scholar Program of Guangxi Institutes.We acknowledge DESY(Hamburg,Germany),a member of the Helmholtz Association HGF,and Paul Scherrer Institut(Villigen PSI,Switzerland)for the provision of experimental facilities contributes to the research performed at CELEST(Center for Electro-chemical Energy Storage Ulm-Karlsruhe)and was supported by the German Research Foundation(DFG)under Project ID 390874152(POLiS Cluster of Excellence) 

主　　题：In situ sXRD Structural evolution 3d transition-metal oxides Layered structure High-temperature solid-state reaction 

摘      要：Layered alkali-containing 3d transition-metal oxides are of the utmost importance in the use of electrode materials for advanced energy storage applications such as Li-,Na-,or K-ion batteries.A significant challenge in the field of materials chemistry is understanding the dynamics of the chemical reactions between alkali-free precursors and alkali species during the synthesis of these *** this study,in situ high-resolution synchrotron-based X-ray diffraction was applied to reveal the Li/Na/K-ion insertion-induced structural transformation mechanism during high-temperature solid-state *** in situ diffraction results demonstrate that the chemical reaction pathway strongly depends on the alkali-free precursor type,which is a structural matrix enabling phase *** phase analysis identifies for the first time the decomposition of lithium sources as the most critical factor for the formation of metastable intermediates or impurities during the entire process of Li-rich layered Li[Li_(0.2)Ni_(0.2)Mn_(0.6)]O_(2) *** the alkali ions have different ionic radii,Na/K ions tend to be located on prismatic sites in the defective layered structure(Na_(2/3-x)[Ni_(0.25)Mn_(0.75)]O_(2) or K_(2/3-x)[Ni_(0.25)Mn_(0.75)]O_(2))during calcination,whereas the Li ions prefer to be localized on the tetrahedral and/or octahedral sites,forming O-type structures.