Insights into Ti doping for stabilizing the Na2/3Fe1/3Mn2/3O2 cathode in sodium ion battery

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

12 Scopus Citations
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  • Jian Zhang
  • He Zhu
  • Tianyi Li
  • Leighanne C. Gallington
  • Si Lan
  • Ligao Yang


Original languageEnglish
Pages (from-to)542-548
Journal / PublicationJournal of Energy Chemistry
Online published18 Jun 2022
Publication statusPublished - Oct 2022


Iron- and manganese-based layered metal oxides, as cathodes for sodium ion batteries, have received widespread attention because of the low cost and high specific capacity. However, the Jahn-teller effect of Mn3+ ions and the resulted unstable structure usually lead to continuously capacity decay. Herein, Titanium (Ti) has been successfully doped into Na2/3Fe1/3Mn2/3O2 to suppress the Jahn-Teller distortion and improve both cycling and rate performance of sodium ion batteries. In situ high-energy synchrotron X-ray diffraction study shows that Ti-doped compound (Na2/3Fe1/3Mn0.57Ti0.1O2) can maintain the single P2 phase without any phase transition during the whole charging/discharging process. Various electrochemical characterizations are also applied to explore the better kinetics of sodium ions transfer in the Na2/3Fe1/3Mn0.57Ti0.1O2. This work provides a comprehensive insight into the Ti-doping effects on the performance from both structural and electrokinetic perspectives.

Research Area(s)

  • In situ synchrotron X-ray diffraction, Jahn-Teller effect, Layered transition metal oxides, Phase transition