Oxygen vacancy promising highly reversible phase transition in layered cathodes for sodium-ion batteries
作者机构：Center of Energy Storage Materials&TechnologyCollege of Engineering and Applied SciencesNational Laboratory of Solid State MicrostructuresCollaborative Innovation Center of Advanced MicrostructuresJiangsu Key Laboratory of Artificial Functional MaterialsNanjing UniversityNanjing210093China Institute for Superconducting&Electronic MaterialsSchool of MechanicalMaterials and Mechatronics EngineeringUniversity of WollongongWollongongNSW2522Australia China Spallatoin Neutron SourceInstitute of High Energy PhysicsChinese Academy of SciencesDongguan523808China School of Nuclear Science and TechnologyUniversity of Chinese Academy of SciencesBeijing101408China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing100190China School of Physical SciencesUniversity of Chinese Academy of SciencesBeijing101408China Songshan Lake Materials LaboratoryDongguan523808China School of materials science and engineeringJiangsu UniversityZhenjiang212013China Energy Technology Research InstituteNational Institute of Advanced Industrial Science and Technology(AIST)Umezono 1-1-1Tsukuba305-8568Japan
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2021年第14卷第11期
页 面：4100-4106页
核心收录：
学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学]
基 金：The financial is supported by the National Natural Science Foundation of China (Nos. 22075132, 51802149, and U1801251) the Fundamental Research Funds for the Central Universities, and Nanjing University Technology Innovation Fund Project. The authors are also grateful to the High Performance Computing Center (HPCC) of Nanjing University for doing the numerical calculations in this paper on its blade cluster system. W. K. P. is grateful to the financial support by the Australian Research Council through a Future Fellowship project (No. FT160100251) The operational support of ANSTO staffs, especially Dr. Vanessa Peterson and Dr. Christophe Didier, on the collection of neutron powder diffraction data of NaNCMT is highly appreciated. The neutron diffraction data were collected at ANSTO (Australia), CSNS (China), and NIST (USA).
主 题：sodium-ion battery layered oxide O_(3)phase oxygen vacancy reversible phase transition
摘 要：Phase transition is common during (de)-intercalating layered sodium oxides, which directly affects the structural stability and electrochemical performance. However, the artificial control of phase transition to achieve advanced sodium-ion batteries is lacking, since the remarkably little is known about the influencing factor relative to the sliding process of transition-metal slabs upon sodium release and uptake of layered oxides. Herein, we for the first time demonstrate the manipulation of oxygen vacancy concentrations in multinary metallic oxides has a significant impact on the reversibility of phase transition, thereby determining the sodium storage performance of cathode materials. Results show that abundant oxygen vacancies intrigue the return of the already slide transition-metal slabs between O_(3) and P_(3) phase transition, in contrast to the few oxygen vacancies and resulted irreversibility. Additionally, the abundant oxygen vacancies enhance the electronic and ionic conductivity of the Na0.9Ni0.3Co0.15Mn0.05Ti0.5O2 electrode, delivering the high initial Coulombic efficiency of 97.1%, large reversible capacity of 112.7 mAh·g−1, superior rate capability upon 100 C and splendid cycling performance over 1,000 cycles. Our findings open up new horizons for artificially manipulating the structural evolution and electrochemical process of layered cathodes, and pave a way in designing advanced sodium-ion batteries.
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