期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 160, 期 4, 页码 A569-A574出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.032304jes
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资金
- Agence Nationale de la Recherche (Blanc Inter II, SIMI 8) [2011-IS08-001-01]
- Region Aquitaine
- CNRS
Using auto-combustion synthesis route followed by a 1000 degrees C heat-treatment, we succeeded to prepare four Na-x(Mn,Fe)O-2 phases: P2-Na0.67Mn2/3Fe1/3O2, P2-Na0.71Mn1/2Fe1/2O2, and new Na-deficient O3-Na0.82Mn1/3Fe2/3O2 and O3-Na similar to 08Mn1/2Fe1/2O2 phases. We studied their structures by X-ray Diffraction and their electrochemical properties as positive electrode in Na-cells that were reversibly charged and discharged in the 1.5 and 3.8 V range vs. Na+/Na, leading to discharge capacities between 135 and 155 mAh.g(-1). The shapes of the cycling curves are discussed together with the stacking of the phases and the redox processes involved in the Na intercalation/deintercalation reaction. In some cases the Fe(IV) state is clearly reached. 2013 The Electrochemical Society. [DOI: 10.1149/2.032304jes] All rights reserved.
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