Novel K+-doped Na0.6Mn0.35Fe0.35Co0.3O2 cathode materials for sodium-ion batteries: synthesis, structures, and electrochemical properties


A series of novel KxNa0.6-xMn0.35Fe0.35Co0.3O2 (x = 0, 0.005, 0.01, 0.05, 0.1) materials were successfully synthesized by the solid-state reaction method. The newly prepared cathode materials were examined by means of X-ray diffraction. They were characterized by scanning electron microscopy (SEM-EDS) and inductively coupled plasma mass spectrometry (ICP-OES). Their electrochemical performances for sodium-ion batteries were tested. The effects of varying K+ doping content on the electrochemical battery performance on the prepared cathode materials were investigated. It was found that the potassium-doped K0.01Na0.59Mn0.35Fe0.35Co0.3O2 showed the best electrochemical performance with an initial discharge capacity of 138.0 mAh g−1 among them. The capacity retention after 20 cycles for Na0.6Mn0.35Fe0.35Co0.3O2 (without K+ doping) was 87.6%. After the potassium doped, the capacity retentions for K0.01Na0.59Mn0.35Fe0.35Co0.3O2 and K0.005Na0.595Mn0.35Fe0.35Co0.3O2 compounds were 90.8% and 90.6% respectively. These results proved that the appropriate amount of K+ doping could be a feasible strategy to increase the cycling stability performance of layered cathode for sodium-ion battery.

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All work in this study is accomplished at the TUBITAK Marmara Research Center Battery Technologies Laboratory.


The authors gratefully acknowledge the support provided by the Ministry of Development of Turkey for the financial support within the frame of the Research Project 2014K121080. Serap Gençtürk Tosun acknowledges support from TUBITAK BIDEB National Scholarship Programme for Ph.D. Students (2228-B).

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Correspondence to Serkan Yeşilot.

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Tosun, S.G., Uzun, D. & Yeşilot, S. Novel K+-doped Na0.6Mn0.35Fe0.35Co0.3O2 cathode materials for sodium-ion batteries: synthesis, structures, and electrochemical properties. J Solid State Electrochem (2021).

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  • Sodium-ion battery
  • Cathode material
  • Layered oxide
  • K+ doping
  • Electrochemical performance