Sodium manganese oxide thin films as cathodes for Na-ion batteries

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

DOI:https://doi.org/10.1149/05812.0047ecst· OSTI ID:1154800

Baggetto, Loic ^[1]; Carroll, Kyler J ^[2]; Unocic, Raymond R ^[1]; Bridges, Craig A ^[1]; Meng, Ying Shirley ^[2]; Veith, Gabriel M ^[1]

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1. ORNL
2. University of California, San Diego

This paper presents the fabrication and characterization of sodium manganese oxide cathode thin films for rechargeable Na-ion batteries. Layered oxide compounds of nominal compositions Na0.6MnO2 and Na1.0MnO2 have been prepared by radio frequency magnetron sputtering and post-annealing at high temperatures under various conditions. The Na0.6MnO2 thin films possess either a hexagonal or orthorhombic structure while the Na1.0MnO2 films crystallize in a monoclinic structure, as shown by X-ray diffraction and X-ray absorption spectroscopy results. The potential profiles of the film cathodes are characterized by features similar to those measured for the powders and exhibit reversible storage capacities in the range of 50-60 Ah cm-2 m-1, which correspond to about 120-140 mAh g-1, and are maintained over 80 cycles.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1154800
• Journal Information: Electrochemical Society Transactions, Vol. 50, Issue 12
• Country of Publication: United States
• Language: English