Neutron Diffraction and Electrochemical Studies of Na0.79CoO2and Na0.79Co0.7Mn0.3O2Cathodes for Sodium-Ion Batteries
| Autor: | Zhonghe Bi, Craig A. Bridges, Zachary Moorhead-Rosenberg, Yongqiang Cheng, John B. Goodenough, Mikhail Feygenson, Ayyakkannu Manivannan, Faith R. Beck, M. Parans Paranthaman, Arumugam Manthiram |
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| Rok vydání: | 2014 |
| Předmět: |
Diffraction
Materials science Renewable Energy Sustainability and the Environment Sodium Intercalation (chemistry) Neutron diffraction Analytical chemistry chemistry.chemical_element Condensed Matter Physics Electrochemistry Redox Cathode Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Crystallography chemistry law Materials Chemistry Cyclic voltammetry |
| Zdroj: | Journal of The Electrochemical Society. 161:A961-A967 |
| ISSN: | 1945-7111 0013-4651 |
| Popis: | 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 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 Na0.79Co0.70Mn0.3O2 composition showing a more stable discharge capacity up to 60 cycles. |
| Databáze: | OpenAIRE |
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