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

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Title
In operando formation of new iron-oxyfluoride host structure for Na-ion storage from NaF–FeO nanocomposite
Author(s)
Hwang I.; Jung S.-K.; Cho S.-P.; Kang K.
Publication Date
2019-12
Journal
ENERGY STORAGE MATERIALS, v.23, no., pp.427 - 433
Publisher
ELSEVIER
Abstract
© 2019 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
URI
https://pr.ibs.re.kr/handle/8788114/6698
ISSN
2405-8297
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
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