A Cation and Anion Dual Doping Strategy for the Elevation of Titanium Redox Potential for High‐Power Sodium‐Ion Batteries
In: Angewandte Chemie International Edition, Jg. 59 (2020-05-12), S. 12076-12083
Online
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Zugriff:
Titanium-based polyanions have been intensively investigated for sodium-ion batteries owing to their superior structural stability and thermal safety. However, their low working potential hindered further applications. Now, a cation and anion dual doping strategy is used to boost the redox potential of Ti-based cathodes of NaTiV(PO)N as a new cathode material for sodium ion batteries. Both the Ti/Ti and V/V redox couples are reversibly accessed, leading to two distinctive voltage platforms at ca. 3.3 V and ca. 3.8 V, respectively. The remarkably improved cycling stability (86.3 %, 3000 cycles) can be ascribed to the near-zero volume strain in this unusual cubic symmetry, which has been demonstrated by in situ synchrotron-based X-ray diffraction. First-principles calculations reveal its well-interconnected 3D Na diffusion pathways with low energy barriers, and the two-sodium-extracted intermediate NaTiV(PO)N is also a stable phase according to formation energy calculations.
Titel: |
A Cation and Anion Dual Doping Strategy for the Elevation of Titanium Redox Potential for High‐Power Sodium‐Ion Batteries
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Autor/in / Beteiligte Person: | Chen, Mingzhe ; Liu, Hua-Kun ; Wang, Wanlin ; Xiao, Jin ; Shi Xue Dou ; Chou, Shulei ; Hu, Zhe ; Hua, Weibo ; Gu, Qinfen ; Tang, Yuxin |
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Zeitschrift: | Angewandte Chemie International Edition, Jg. 59 (2020-05-12), S. 12076-12083 |
Veröffentlichung: | Wiley, 2020 |
Medientyp: | unknown |
ISSN: | 1521-3773 (print) ; 1433-7851 (print) |
DOI: | 10.1002/anie.202003275 |
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