Effect of Ti-substitution on the properties of P3 structure Na2/3Mn0.8Li0.2O2 showing a ribbon superlattice

Stephanie Frances Linnell, Eun Jeong Kim, Le Anh Ma, Aaron Benjamin Naden, John Thomas Sirr Irvine, Reza Younesi, Laurent Duda, Robert Armstrong*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
2 Downloads (Pure)


Oxygen anion redox offers an effective strategy to enhance the energy density of layered oxide positive electrodes for sodium- and lithium-ion batteries. However, lattice oxygen loss and irreversible structural transformations over the first cycle may result in large voltage hysteresis, thereby impeding practical application. Herein, ribbon superstructure ordering of Li/transition-metal-ions was applied to suppress the voltage hysteresis combined with Ti-substitution to improve the cycling stability for P3-Na0.67Li0.2Ti0.15Mn0.65O2. When both cation and anion redox reactions are utilized, Na0.67Li0.2Ti0.15Mn0.65O2 delivers a reversible capacity of 172 mA h g−1 after 25 cycles at 10 mA g−1 between 1.6–4.4 V vs. Na+/Na. Ex-situ X-ray diffraction data reveal that the ribbon superstructure is retained with negligible unit cell volume expansion/contraction upon sodiation/desodiation. The performance as a positive electrode for Li-ion batteries was also evaluated and P3-Na0.67Li0.2Ti0.15Mn0.65O2 delivers a reversible capacity of 180 mA h g−1 after 25 cycles at 10 mA g−1 when cycled vs. Li+/Li between 2.0–4.8 V.
Original languageEnglish
Article numbere202200929
Issue number19
Early online date13 Oct 2022
Publication statusPublished - 14 Oct 2022


  • Anion redox chemistry
  • Layered compounds
  • Positive electrode material
  • Sodium
  • Superstructure


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