Detecting dynamic structural evolution based on in-situ high-energy X-ray diffraction technology for sodium layered oxide cathodes  

作　　者：Yan-Jiang Li Shu-Lei Chou Yao Xiao 

机构地区：[1]Wenzhou Key Laboratory of Sodium-Ion Batteries,Wenzhou University Technology Innovation Institute for Carbon Neutralization,Wenzhou 325035,China

出　　处：《Chinese Chemical Letters》2025年第2期118-132,共15页中国化学快报(英文版)

基　　金：supported by the State Grid Corporation Science and Technology Project(No.5419-202158503A-0-5-ZN)。

摘　　要：The detrimental phase transformations of sodium layered transition metal oxides(Na_(x)TMO_(2))during desodiation/sodiation seriously suppress their practical applications for sodium ion batteries(SIBs).Undoubtedly,comprehensively investigating of the dynamic crystal structure evolutions of Na_(x)TMO_(2)associating with Na ions extraction/intercalation and then deeply understanding of the relationships between electrochemical performances and phase structures drawing support from advanced characterization techniques are indispensable.In-situ high-energy X-ray diffraction(HEXRD),a powerful technology to distinguish the crystal structure of electrode materials,has been widely used to identify the phase evolutions of Na_(x)TMO_(2)and then profoundly revealed the electrochemical reaction processes.In this review,we begin with the descriptions of synchrotron characterization techniques and then present the advantages of synchrotron X-ray diffraction(XRD)over conventional XRD in detail.The optimizations of structural stability and electrochemical properties for P2-,O3-,and P2/O3-type Na_(x)TMO_(2)cathodes through single/dual-site substitution,high-entropy design,phase composition regulation,and surface engineering are summarized.The dynamic crystal structure evolutions of Na_(x)TMO_(2)polytypes during Na ion extraction/intercalation as well as corresponding structural enhancement mechanisms characterizing by means of HEXRD are concluded.The interior relationships between structure/component of Na_(x)TMO_(2)polytypes and their electrochemical properties are discussed.Finally,we look forward the research directions and issues in the route to improve the electrochemical properties of Na_(x)TMO_(2)cathodes for SIBs in the future and the combined utilizations of multiple characterization techniques.This review will provide significant guidelines for rational designs of high-performance Na_(x)TMO_(2)cathodes.

关 键 词：Layered oxides Sodium-ion batteries Phase evolutions In-situ high-energy X-ray diffraction ELECTROCHEMISTRY 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ131.12[化学工程—无机化工]