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Nano Research 2017, 10(12): 4388-4397 https://doi.org/10.1007/s12274-017-1538-y
Research Article | Issue | Published: 25 May 2017

NaF–FeF2 nanocomposite: New type of Na-ion battery cathode material

Show Author's Information Insang Hwang1,  Sung-Kyun Jung1,  Eun-Suk Jeong1,  Hyunchul Kim2,  Sung-Pyo Cho3,  Kyojin Ku1,  Hyungsub Kim1,4,  Won-Sub Yoon2,  Kisuk Kang1,5( )
Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM) Seoul National UniversitySeoul 08826 Republic of Korea
Department of Energy Science (DOES) Sungkyunkwan UniversitySuwon 16419 Republic of Korea
National Center for Inter-University Research Facilities Seoul National UniversitySeoul 08826 Republic of Korea
Neutron Science Division, HANARO Korea Atomic Energy Research InstituteDaejeon 34057 Republic of Korea
Center for Nanoparticle Research, Institute for Basic Science (IBS) Seoul National UniversitySeoul 08826 Republic of Korea
Keywords:
nanocomposite, cathode, Na-ion batteries, NaF, FeF2
Cite this article:
Hwang I, Jung S-K, Jeong E-S, et al. NaF–FeF2 nanocomposite: New type of Na-ion battery cathode material. Nano Research, 2017, 10(12): 4388-4397. https://doi.org/10.1007/s12274-017-1538-y
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Abstract Full text Electronic supplementary material About this article

Na-ion batteries (NIBs) are considered one of the most attractive alternatives for Li-ion batteries (LIBs) because of the natural abundance of Na and the similarities between the NIB technology and the well-established LIB technology. However, the discovery of high-performance electrode materials remains a key factor in the success of NIBs. Herein, we propose a new type of cathode material for NIBs based on a nanocomposite of an alkali metal fluoride (NaF) and a transition metal fluoride (FeF2). Although neither of these components is electrochemically active with Na, the nanoscale mixture of the two can deliver a reversible capacity of ~125 mAh/g in the voltage range of 1.2–4.8 V vs. Na/Na+ via an Fe2+/Fe3+ redox couple. X-ray absorption spectroscopy reveals that the reversible Na storage is aided by the F– ions due to the decomposition of NaF, which are absorbed on the surface of FeF2, promoting the redox reaction of Fe and triggering the gradual transformation of the mother structure (FeF2) into a new (FeF3-like) host structure for the Na ions. This unique Na-ion storage phenomenon, which is reported for the first time, will introduce an avenue for designing novel cathode materials for NIBs.


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About this article

NaF–FeF2 nanocomposite: New type of Na-ion battery cathode material

Show Author's information Insang Hwang1, Sung-Kyun Jung1, Eun-Suk Jeong1, Hyunchul Kim2, Sung-Pyo Cho3, Kyojin Ku1, Hyungsub Kim1,4, Won-Sub Yoon2, Kisuk Kang1,5( )
Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM) Seoul National UniversitySeoul 08826 Republic of Korea
Department of Energy Science (DOES) Sungkyunkwan UniversitySuwon 16419 Republic of Korea
National Center for Inter-University Research Facilities Seoul National UniversitySeoul 08826 Republic of Korea
Neutron Science Division, HANARO Korea Atomic Energy Research InstituteDaejeon 34057 Republic of Korea
Center for Nanoparticle Research, Institute for Basic Science (IBS) Seoul National UniversitySeoul 08826 Republic of Korea

Abstract

Na-ion batteries (NIBs) are considered one of the most attractive alternatives for Li-ion batteries (LIBs) because of the natural abundance of Na and the similarities between the NIB technology and the well-established LIB technology. However, the discovery of high-performance electrode materials remains a key factor in the success of NIBs. Herein, we propose a new type of cathode material for NIBs based on a nanocomposite of an alkali metal fluoride (NaF) and a transition metal fluoride (FeF2). Although neither of these components is electrochemically active with Na, the nanoscale mixture of the two can deliver a reversible capacity of ~125 mAh/g in the voltage range of 1.2–4.8 V vs. Na/Na+ via an Fe2+/Fe3+ redox couple. X-ray absorption spectroscopy reveals that the reversible Na storage is aided by the F– ions due to the decomposition of NaF, which are absorbed on the surface of FeF2, promoting the redox reaction of Fe and triggering the gradual transformation of the mother structure (FeF2) into a new (FeF3-like) host structure for the Na ions. This unique Na-ion storage phenomenon, which is reported for the first time, will introduce an avenue for designing novel cathode materials for NIBs.

Keywords: nanocomposite, cathode, Na-ion batteries, NaF, FeF2

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Publication history
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Acknowledgements

Publication history

Received: 21 December 2016
Revised: 11 February 2017
Accepted: 13 February 2017
Published: 25 May 2017
Issue date: December 2017

Copyright

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2017

Acknowledgements

Acknowledgements

This work was supported by Samsung Research Funding Center of Samsung Electronics (No. SRFC-TA1403-03). This work was also supported by the World Premier Materials grant funded by the Korea government Ministry of Trade, Industry and Energy.

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