Suppressing the chromium disproportionation reaction in O3-type layered cathode materials for high capacity sodium-ion batteries

Ming Hui Cao, Yong Wang, Zulipiya Shadike, Ji Li Yue, Enyuan Hu, Seong Min Bak, Yong Ning Zhou, Xiao Qing Yang, Zheng Wen Fu

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)

Abstract

Chromium-based layered cathode materials suffer from the irreversible disproportionation reaction of Cr4+ to Cr3+ and Cr6+, which hinders the reversible multi-electron redox of Cr ions in layered cathodes, and limits their capacity and reversibility. To address this problem, a novel O3-type layer-structured transition metal oxide of NaCr1/3Fe1/3Mn1/3O2 (NCFM) was designed and studied as a cathode material. A high reversible capacity of 186 mA h g−1 was achieved at a current rate of 0.05C in a voltage range of 1.5 to 4.2 V. X-ray diffraction revealed an O3 → (O3 + P3) → (P3 + O3′′) → O3′′ phase-transition pathway for NCFM during charge. X-ray absorption, X-ray photoelectron and electron energy-loss spectroscopy measurements revealed the electronic structure changes of NCFM during Na+ deintercalation/intercalation processes. It is confirmed that the disproportionation reaction of Cr4+ to Cr3+ and Cr6+ can be effectively suppressed by Fe3+ and Mn4+ substitution. These results demonstrated that the reversible multi-electron oxidation/reduction of Cr ions can be achieved in NCFM during charge and discharge accompanied by CrO6 octahedral distortion and recovery.

Original languageEnglish
Pages (from-to)5442-5448
Number of pages7
JournalJournal of Materials Chemistry A
Volume5
Issue number11
DOIs
Publication statusPublished - 2017

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry.

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Renewable Energy, Sustainability and the Environment
  • General Materials Science

Fingerprint

Dive into the research topics of 'Suppressing the chromium disproportionation reaction in O3-type layered cathode materials for high capacity sodium-ion batteries'. Together they form a unique fingerprint.

Cite this