Neutron diffraction and electrochemical studies of Na 0.79CoO2 and Na0.79Co0.7Mn 0.3O2 cathodes for sodium-ion batteries

Faith R. Beck, Y. Q. Cheng, Zhonghe Bi, Mikhail Feygenson, Craig A. Bridges, Zachary Moorhead-Rosenberg, Arumugam Manthiram, John B. Goodenough, M. Parans Paranthaman, Ayyakkannu Manivannan

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Abstract

Na0.79CoO2 and Na0.79Co 0.7Mn0.3O2 with a layered hexagonal structure (P2-type) were synthesized by the Pechini process followed by heat-treatment at elevated temperatures in order to achieve the crystalline phases. The samples were characterized with X-ray diffraction, neutron diffraction, magnetic measurements and electrochemical charge-discharge cycling. X-ray diffraction confirmed the presence of P2 layered hexagonal structure after heat-treatment at 900°C in air. Neutron diffraction patterns confirm Mn substitution on Co sites without forming pronounced Mn-Co ordering. Cyclic voltammetry showed the oxidation and reduction peaks of Co and Mn, indicating the intercalation and de-intercalation behavior of the Na ions. A discharge capacity of 60 mAh/g was achieved for both compositions, with the Na0.79Co 0.7Mn0.3O2 composition showing a more stable discharge capacity up to 60 cycles.

Original languageEnglish (US)
Pages (from-to)A961-A967
JournalJournal of the Electrochemical Society
Volume161
Issue number6
DOIs
StatePublished - 2014

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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