A disordered rock-salt Li-excess cathode material with high capacity and substantial oxygen redox activity: Li1.25Nb0.25Mn0.5O2

Rui Wang, Xin Li, Lei Liu, Jinhyuk Lee, Dong Hwa Seo, Shou Hang Bo, Alexander Urban, Gerbrand Ceder*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

149 Citations (Scopus)

Abstract

A disordered rocksalt Li-excess cathode material, Li1.25Nb0.25Mn0.5O2, was synthesized and investigated. It shows a large initial discharge capacity of 287 mAh g- 1 in the first cycle, which is much higher than the theoretical capacity of 146 mAh g- 1 based on the Mn3+/Mn4+ redox reaction. In situ X-ray diffraction (XRD) demonstrates that the compound remains cation-disordered during the first cycle. Electron energy loss spectroscopy (EELS) suggests that Mn and O are likely to both be redox active, resulting in the large reversible capacity. Our results show that Li1.25Nb0.25Mn0.5O2 is a promising cathode material for high capacity Li-ion batteries and that reversible oxygen redox in the bulk may be a viable way forward to increase the energy density of lithium-ion batteries.

Original languageEnglish
Article number5508
Pages (from-to)70-73
Number of pages4
JournalElectrochemistry Communications
Volume60
DOIs
Publication statusPublished - 1 Nov 2015

Keywords

  • Cathode
  • Disordered rocksalt
  • High capacity
  • Li-excess
  • Lithium ion batteries

Fingerprint

Dive into the research topics of 'A disordered rock-salt Li-excess cathode material with high capacity and substantial oxygen redox activity: Li1.25Nb0.25Mn0.5O2'. Together they form a unique fingerprint.

Cite this