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Batteries 2017, 3(1), 5; doi:10.3390/batteries3010005

Domain Size of Phase-Separated NaxCoO2 as Investigated by X-Ray Microdiffraction

1
Faculty of Pure and Applied Science, University of Tsukuba, Tsukuba 305-8571, Japan
2
Center for Integrated Research in Fundamental Science and Engineering (CiRfSE), University of Tsukuba, Tsukuba 305-8571, Japan
3
National Institute of Technology, Gunma College, Gunma 371-8530, Japan
4
Japan Synchrotron Radiation Research Institute (JASRI), Kouto, Sayo 679-5198, Japan
*
Authors to whom correspondence should be addressed.
Academic Editor: Andreas Jossen
Received: 7 January 2017 / Revised: 15 February 2017 / Accepted: 21 February 2017 / Published: 2 March 2017
(This article belongs to the Special Issue Physical Properties of Sodium-Ion Battery Materials)
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Abstract

O3-NaCoO 2 is a promising cathode material for sodium ion secondary batteries (SIBs). Na x CoO 2 shows phase separation (PS) into the O3 and O 3 phases in the Na concentration range of 0.89 x 0.99. In order to estimate the domain size (r) in the two-phase region, we performed X-ray microdiffraction (XRMD) of thin films of Na x CoO 2 at x = 0.97 and ∼1. We found that r (≈400 nm) of the O 3 domain is comparable to the particle size d (=331 ± 87 nm) in the as-grown O3-NaCoO 2 film. This observation suggests that individual particles of Na x CoO 2 are single phase to minimize the strain at the O3–O 3 phase boundary. View Full-Text
Keywords: secondary batteries (SIBs); thin film of O3-NaCoO2; X-ray microdiffraction (XRMD) secondary batteries (SIBs); thin film of O3-NaCoO2; X-ray microdiffraction (XRMD)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Niwa, H.; Shibata, T.; Imai, Y.; Kimura, S.; Moritomo, Y. Domain Size of Phase-Separated NaxCoO2 as Investigated by X-Ray Microdiffraction. Batteries 2017, 3, 5.

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