Domain Size of Phase-Separated NaxCoO2 as Investigated by X-Ray Microdiffraction
Faculty of Pure and Applied Science, University of Tsukuba, Tsukuba 305-8571, Japan
Center for Integrated Research in Fundamental Science and Engineering (CiRfSE), University of Tsukuba, Tsukuba 305-8571, Japan
National Institute of Technology, Gunma College, Gunma 371-8530, Japan
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
is a promising cathode material for sodium ion secondary batteries (SIBs). Na
shows phase separation (PS) into the O3 and O
3 phases in the Na concentration range of 0.89
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
= 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
film. This observation suggests that individual particles of Na
are single phase to minimize the strain at the O3–O
3 phase boundary.
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MDPI and ACS Style
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.
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(1):5.
Niwa, Hideharu; Shibata, Takayuki; Imai, Yasuhiko; Kimura, Shigeru; Moritomo, Yutaka. 2017. "Domain Size of Phase-Separated NaxCoO2 as Investigated by X-Ray Microdiffraction." Batteries 3, no. 1: 5.
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