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In operando formation of new iron-oxyfluoride host structure for Na-ion storage from NaF–FeO nanocomposite

Cited 2 time in Web of Science Cited 2 time in Scopus
Authors
Hwang, Insang; Jung, Sung-Kyun; Cho, Sung-Pyo; Kang, Kisuk
Issue Date
2019-12
Citation
Energy Storage Materials, Vol.23, pp.427-433
Abstract
Herein, we report a cubic FeOF structure as a new reversible Na ion host, which is formed during the electrochemical reaction from an electrode based on a nanosized mixture of NaF and FeO. This new FeOF host structure differs from the well-known rutile FeOF structure and displays distinct electrochemical properties as an electrode for Na-ion batteries. The X-ray absorption spectra measured at various cycles indicate that the cubic FeOF host structure gradually forms as cycling progresses. After formation of the cubic FeOF host structure, a discharge capacity of 165 mAh/g is delivered, corresponding to the intercalation of 0.7 Na+ ions per Fe with a volume change of 2.3% during charge and discharge, which is offered at a higher redox potential than that of the rutile FeOF electrode by approximately 0.2 V.
ISSN
2405-8297
URI
http://hdl.handle.net/10371/164958
DOI
https://doi.org/10.1016/j.ensm.2019.04.020
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Material Science and Engineering (재료공학부) Journal Papers (저널논문_재료공학부)
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