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Advanced P2-Na

Qiong Yang1, Peng-Fei Wang2,3, Jin-Zhi Guo1

  • 1National & Local United Engineering Laboratory for Power Batteries, Faculty of Chemistry , Northeast Normal University , Changchun 130024 , Jilin , P. R. China.

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|September 18, 2018
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Summary
This summary is machine-generated.

Iron doping stabilizes P2-type sodium layered oxide cathodes for sodium-ion batteries. This enhancement improves cycling stability and rate performance, paving the way for practical energy storage applications.

Keywords:
full cellhigh-performance cathodeiron substitutionlow-temperature performancesodium-ion battery

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • P2-type Na2/3Ni1/3Mn2/3O2 (NNMO) is a promising cathode material for sodium-ion batteries due to its high theoretical capacity and voltage.
  • Poor cycling stability, primarily caused by the P2-O2 phase transition, limits the practical application of NNMO.

Purpose of the Study:

  • To enhance the structural stability and electrochemical performance of P2-type NNMO by introducing iron (Fe) doping.
  • To investigate the effect of Fe substitution on the P2-O2 phase transition and sodium-ion diffusion kinetics.

Main Methods:

  • Synthesis of Fe-substituted NNMO materials (Na2/3Ni1/3Mn2/3-xFe xO2) with varying Fe content.
  • Electrochemical characterization including cycling tests, rate capability tests, and low-temperature performance evaluation.
  • Structural analysis using ex situ X-ray diffraction (XRD) to study phase transitions during cycling.
  • Electrode kinetic studies to understand the influence of doping on sodium diffusion.

Main Results:

  • Fe doping effectively stabilizes the P2-type crystalline structure, suppressing the undesirable P2-O2 phase transition.
  • The optimized Na2/3Ni1/3Mn7/12Fe1/12O2 (1/12-NNMF) cathode exhibits excellent long-term cycling stability (0.05% capacity fading per cycle over 300 cycles at 5 C).
  • 1/12-NNMF demonstrates superior rate capabilities (65 mAh g-1 at 25 C) and remarkable low-temperature performance (94% capacity retention at -25 °C after 80 cycles).
  • Enhanced Na diffusion kinetics were observed in Fe-doped materials.

Conclusions:

  • Fe substitution is a viable strategy to improve the structural and electrochemical properties of P2-type layered oxides for sodium-ion batteries.
  • The optimized 1/12-NNMF cathode shows significant potential for practical applications, evidenced by its stable cycling, rate performance, and low-temperature behavior.
  • The study highlights the possibility of using 1/12-NNMF in full cells when paired with suitable anodes like LS-Sb@G.