Electrochemical and thermal properties of α-NaFeO2 cathode for Na-ion batteries

Jie Zhao, Liwei Zhao, Nikolay Dimov, Shigeto Okada, Tetsuaki Nishida

Research output: Contribution to journalArticlepeer-review

177 Citations (Scopus)

Abstract

α-NaFeO2 is promising as minor-metal free cathode materials for low cost sodium-ion batteries. It has a flat voltage plateau at 3.3 V vs. Na metal and a stable reversible capacity of 85 mAh g-1. Fe3+/Fe4+ redox reaction on charge/discharge cycle was confirmed by 57Fe Mössbauer spectrometer. The thermal stability of NaFeO2 cathodes with/without 1 mol dm-3 NaClO 4/EC-DMC electrolyte was investigated by DSC measurements. The fully-charged Na0.58FeO2 powder decomposed thermally at a temperature higher than 300°C, with Fe2O3 as a possible product. On the other hand, the mixture of Na0.58FeO 2 powder and electrolyte showed exothermic heat in a temperature range of 220-300°C. However, NaFeO2 showed better thermal stability in the electrolyte than LiCoO2 counterparts in Li ion battery systems, including less heat generation and higher exothermic onset temperature. This indicated that the Na-ion batteries might have comparable thermal stability with Li-ion batteries.

Original languageEnglish
Pages (from-to)A3077-A3081
JournalJournal of the Electrochemical Society
Volume160
Issue number5
DOIs
Publication statusPublished - Apr 8 2013

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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