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- Title
Interrelation between inhomogeneity and cyclability in O3-NaFe<sub>1/2</sub>Co<sub>1/2</sub>O<sub>2</sub>.
- Authors
Amaha, Kaoru; Kobayashi, Wataru; Akama, Shota; Mitsuishi, Kazutaka; Moritomo, Yutaka
- Abstract
O3-NaFe1/2Co1/2O2 shows initial capacity of 160 mAh/g and an average operating voltage of 3.1 V (vs. Na) with good cyclability, and is a promising candidate of the cathode materials for sodium-ion secondary batteries (SIBs). Here, we found that the cyclability of the slowly-cooled sample is much worse than that of quenched one, even though the former sample keeps the O3-type structure. The energy dispersive X-ray spectroscopy (EDX) images suggest that the slow-cooled sample (Na x Fe1- yCo y O2) is inhomogeneous in the Fe concentration (1 - y), perhaps triggered by the Na deficiency (1 - x). We ascribed the poor cyclability in the slowly-cooled sample to the concentration inhomogeneity (Δ y). The Δ y is further responsible for the fluctuation of the lattice constants ( a and c), as revealed by the Williamson-Hall plot. (© 2016 WILEY-VCH Verlag GmbH &Co. KGaA, Weinheim)
- Subjects
ELECTRIC potential; CATHODES; ELECTRODES; ENERGY dispersive X-ray spectroscopy; CHARACTERISTIC X-ray spectrum
- Publication
Physica Status Solidi - Rapid Research Letters, 2017, Vol 11, Issue 1, pn/a
- ISSN
1862-6254
- Publication type
Article
- DOI
10.1002/pssr.201600284