Enhanced Rate Capability and Cycle Performance of Titanium-Substituted P2-Type Na0.67Fe0.5Mn0.5O2 as a Cathode for Sodium-Ion Batteries

Joon Ki Park, Geun Gyung Park, Hunho H. Kwak, Seung Tae Hong, Jae Won Lee

Research output: Contribution to journalArticlepeer-review

71 Scopus citations

Abstract

In this study, we developed a doping technology capable of improving the electrochemical performance, including the rate capability and cycling stability, of P2-type Na0.67Fe0.5Mn0.5O2 as a cathode material for sodium-ion batteries. Our approach involved using titanium as a doping element to partly substitute either Fe or Mn in Na0.67Fe0.5Mn0.5O2. The Ti-substituted Na0.67Fe0.5Mn0.5O2 shows superior electrochemical properties compared to the pristine sample. We investigated the changes in the crystal structure, surface chemistry, and particle morphology caused by Ti doping and correlated these changes to the improved performance. The enhanced rate capability and cycling stability were attributed to the enlargement of the NaO2 slab in the crystal structure because of Ti doping. This promoted Na-ion diffusion and prevented the phase transition from the P2 to the OP4/″Z″ structure.

Original languageEnglish
Pages (from-to)361-368
Number of pages8
JournalACS Omega
Volume3
Issue number1
DOIs
StatePublished - 4 Oct 2017

Bibliographical note

Publisher Copyright:
© 2018 American Chemical Society.

Fingerprint

Dive into the research topics of 'Enhanced Rate Capability and Cycle Performance of Titanium-Substituted P2-Type Na0.67Fe0.5Mn0.5O2 as a Cathode for Sodium-Ion Batteries'. Together they form a unique fingerprint.

Cite this