Insights into layered-tunnel dynamic structural evolution based on local coordination chemistry regulation for high-energy-density and long-cycle-life sodium-ion oxide cathodes
作者机构：Institute for Carbon NeutralizationCollege of Chemistry and Materials EngineeringWenzhou UniversityWenzhouthe People's Republic of China Wenzhou Key Laboratory of Sodium-Ion BatteriesWenzhou University Technology Innovation Institute for Carbon NeutralizationWenzhouthe People's Republic of China State Key Laboratory of Electrical Insulation and Power EquipmentSchool of Electrical EngineeringXi'an Jiaotong UniversityXi'anthe People'sRepublic of China School of Chemistry and Materials ScienceHunan Agricultural UniversityChangshathe People's Republic of China Institute for Superconducting and Electronic Materials AustralianInstitute for Innovative Materials University of Wollongong Innovation CampusNorth WollongongNew South WalesAustralia Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy MaterialsCollege of Physics and EnergyFujian Normal UniversityFuzhouthe People's Republic of China
出 版 物：《InfoMat》 (信息材料（英文）)
年 卷 期：2023年第5卷第10期
页 面：32-42页
核心收录：
基 金：National Natural Science Foundation of China,Grant/Award Numbers:51772093,51971124,52171217,52202284 National Key Research and Devel opment Programs,Grant/Award Number:2021YFB2400400 Zhejiang Natural Science Foundation,Grant/Award Number:LQ23E020002 WenZhou Natural Science Foundation,Grant/Award Numbers:G20220019,G20220021 State Key Laboratory of Electrical Insulation and Power Equipment,Xi'an Jiaotong University,Grant/Award Number.EIPE22208 Cooperation between Industry and Education Project of Ministry of Education,Grant/Award Number:220601318235513 Doctoral Innovation Foundation of Wenzhou University,Grant/Award Number.3162023001001
主 题：dynamic structural evolution high-energy-density layered-tunnel structure local coordination chemistry sodium-ion oxide cathodes
摘 要：The pursuit of high energy density while achieving long cycle life remains a challenge in developing transition metal(TM)oxide cathode materials for sodium-ion batteries(SIBs).Here,we present a concept of precisely manipulating structural evolution via local coordination chemistry regulation to design high-performance composite cathode *** controllable structural evolution process is realized by tuning magnesium content in Na0.6Mn1-xMgxO2,which is elucidated by a combination of experimental analysis and theoretical *** substitution of Mg into Mn sites not only induces a unique structural evolu-tion from layered–tunnel structure to layered structure but also mitigates the Jahn–Teller distortion of Mn3+.Meanwhile,benefiting from the strong ionic inter-action between Mg2+and O2-,local environments around O2-coordinated with electrochemically inactive Mg2+are anchored in the TM layer,providing a pinning effect to stabilize crystal structure and smooth electrochemical *** layered–tunnel Na0.6Mn0.95Mg0.05O2 cathode material delivers 188.9 mAh g-1 of specific capacity,equivalent to 508.0 Wh kg-1 of energy density at 0.5C,and exhibits 71.3%of capacity retention after 1000 cycles at 5C as well as excellent compatibility with hard carbon *** work may provide new insights of manipulating structural evolution in composite cathode materials via local coordi-nation chemistry regulation and inspire more novel design of high-performance SIB cathode materials.
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