Neutron diffraction and electrochemical studies of Na0.79(Co,Mn)O2 cathodes for sodium-ion batteries

Journal Article · Wed Jan 01 00:00:00 EST 2014 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/2.025406jes· OSTI ID:1149741

Beck, Faith R ^[1]; Cheng, Yongqiang ^[2]; Feygenson, Mikhail ^[2]; Bridges, Craig A ^[2]; Moorhead-Rosenberg, Z ^[3]; Manthiram, Arumugam ^[4]; Goodenough, J. B. ^[4]; Paranthaman, Mariappan Parans ^[2]; Manivannan, A. ^[1]

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1. National Energy Technology Laboratory (NETL)
2. ORNL
3. Oak Ridge National Laboratory (ORNL)
4. University of Texas at Austin

Na0.79CoO2 and Na0.79Co0.7Mn0.3O2 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 P2 layered hexagonal structure after heat treatment at 900 C in air. Neutron diffraction patterns confirm Mn doping 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 the compositions, with the Na0.79Co0.70Mn0.3O2 composition showing a more stable discharge capacity up to 60 cycles.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1149741
• Journal Information: Journal of the Electrochemical Society, Vol. 161, Issue 6; ISSN 0013--4651
• Country of Publication: United States
• Language: English