Suppressing the irreversible phase transition from P2 to O2 in sodium-layered cathode via integrating P2- and O3-type structures
|Corresponding Author||Ji，Wenhai; Wang，Jun; Xiao，Yinguo|
Layered transition metal oxides have been broadly studied due to their great potential in application as cathodes for sodium-ion batteries. However, many single-phase layered transition metal oxides, especially those crystallized in P2- or O3-type structure, possess their individual characteristics incurring unsatisfactory overall performances with respect to the reversible capacity, rate capability, and cycling stability. Here, an effective strategy of constructing the P2/O3 biphasic structure is realized in layered cathode NaNiMnTiO through Ti substitution. Through high-resolution scanning transmission electron microscopy and X-ray diffraction, the formation of P2/O3 intergrowth structure was clarified and the proportion of the two phases was determined. Benefitting from the presence of intergrowth structure, the layered cathode provides a competitive rate capability of 100 mAh/g at a high rate of 5 C as well as a prominent cycling stability of 80.04% capacity retention after 300 cycles at 5 C. The improved performance is closely related to the highly reversible phase transition process from P2/O3 to OP4/P3 with less strain and enhanced Na kinetics. These findings evidence that exploring novel multiphase cathodes is an effective approach to improve the electrochemical performances of cathode for sodium-ion batteries.
National Key R&D Program of China[2020YFA0406203] ; National Natural Science Foundation of China["52072008","U2032167"] ; Shenzhen Fundamental Research Program[GXWD20201231165807007-20200807125314001]
|WOS Research Area|
Chemistry ; Energy & Fuels ; Materials Science
Chemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary
|WOS Accession No|
Cited Times [WOS]:2
|Document Type||Journal Article|
|Department||Academy for Advanced Interdisciplinary Studies|
1.School of Advanced Materials,Peking University,Shenzhen Graduate School,Shenzhen,518055,China
2.Deutsches Elektronen-Synchrotron DESY,Hamburg,Notkestrasse 85,D22607,Germany
3.Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons,Forschungszentrum Jülich GmbH,Jülich,52425,Germany
4.Department of Materials Science & Engineering,Academy for Advanced Interdisciplinary Studies,Southern University of Science and Technology,Shenzhen,518055,China
|Corresponding Author Affilication||Academy for Advanced Interdisciplinary Studies; Department of Materials Science and Engineering|
Zhai，Jingjun,Ji，Haocheng,Ji，Wenhai,et al. Suppressing the irreversible phase transition from P2 to O2 in sodium-layered cathode via integrating P2- and O3-type structures[J]. Materials Today Energy,2022,29.
Zhai，Jingjun.,Ji，Haocheng.,Ji，Wenhai.,Wang，Rui.,Huang，Zhongyuan.,...&Xiao，Yinguo.(2022).Suppressing the irreversible phase transition from P2 to O2 in sodium-layered cathode via integrating P2- and O3-type structures.Materials Today Energy,29.
Zhai，Jingjun,et al."Suppressing the irreversible phase transition from P2 to O2 in sodium-layered cathode via integrating P2- and O3-type structures".Materials Today Energy 29(2022).
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