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A Cation and Anion Dual Doping Strategy for the Elevation of Titanium Redox Potential for High-Power Sodium-Ion Batteries

Journal Article


Abstract


  • © 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim 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 Na3Ti0.5V0.5(PO3)3N as a new cathode material for sodium ion batteries. Both the Ti3+/Ti4+ and V3+/V4+ 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 NaTi0.5V0.5(PO3)3N is also a stable phase according to formation energy calculations.

Authors


  •   Chen, Mingzhe (external author)
  •   Xiao, Jin (external author)
  •   Hua, Weibo (external author)
  •   Hu, Zhe (external author)
  •   Wang, Wanlin (external author)
  •   Gu, Qinfen (external author)
  •   Tang, Yuxin (external author)
  •   Chou, Shulei
  •   Liu, Hua K.
  •   Dou, Shi Xue

Publication Date


  • 2020

Citation


  • Chen, M., Xiao, J., Hua, W., Hu, Z., Wang, W., Gu, Q., Tang, Y., Chou, S., Liu, H. & Dou, S. (2020). A Cation and Anion Dual Doping Strategy for the Elevation of Titanium Redox Potential for High-Power Sodium-Ion Batteries. Angewandte Chemie - International Edition,

Scopus Eid


  • 2-s2.0-85084426566

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/4144

Has Global Citation Frequency


Place Of Publication


  • Germany

Abstract


  • © 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim 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 Na3Ti0.5V0.5(PO3)3N as a new cathode material for sodium ion batteries. Both the Ti3+/Ti4+ and V3+/V4+ 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 NaTi0.5V0.5(PO3)3N is also a stable phase according to formation energy calculations.

Authors


  •   Chen, Mingzhe (external author)
  •   Xiao, Jin (external author)
  •   Hua, Weibo (external author)
  •   Hu, Zhe (external author)
  •   Wang, Wanlin (external author)
  •   Gu, Qinfen (external author)
  •   Tang, Yuxin (external author)
  •   Chou, Shulei
  •   Liu, Hua K.
  •   Dou, Shi Xue

Publication Date


  • 2020

Citation


  • Chen, M., Xiao, J., Hua, W., Hu, Z., Wang, W., Gu, Q., Tang, Y., Chou, S., Liu, H. & Dou, S. (2020). A Cation and Anion Dual Doping Strategy for the Elevation of Titanium Redox Potential for High-Power Sodium-Ion Batteries. Angewandte Chemie - International Edition,

Scopus Eid


  • 2-s2.0-85084426566

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/4144

Has Global Citation Frequency


Place Of Publication


  • Germany