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나노입자 연구단
나노입자 연구단
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Ternary metal fluorides as high-energy cathodes with low cycling hysteresis

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Title
Ternary metal fluorides as high-energy cathodes with low cycling hysteresis
Author(s)
Wang F.; Kim S.-W.; Dong-Hwa Seo; Kisuk Kang; Wang L.; Su D.; Vajo J.J.; Wang J.; Graetz J.
Publication Date
2015-03
Journal
NATURE COMMUNICATIONS, v.6, no., pp.6668 -
Publisher
NATURE PUBLISHING GROUP
Abstract
Transition metal fluorides are an appealing alternative to conventional intercalation compounds for use as cathodes in next-generation lithium batteries due to their extremely high capacity (3-4 times greater than the current state-of-the-art). However, issues related to reversibility, energy efficiency and kinetics prevent their practical application. Here we report on the synthesis, structural and electrochemical properties of ternary metal fluorides (M1 yM2 1-yFx: M1, M2 = Fe, Cu), which may overcome these issues. By substituting Cu into the Fe lattice, forming the solid-solution CuyFe1-yF2, reversible Cu and Fe redox reactions are achieved with surprisingly small hysteresis (<150 mV). This finding indicates that cation substitution may provide a new avenue for tailoring key electrochemical properties of conversion electrodes. Although the reversible capacity of Cu conversion fades rapidly, likely due to Cu+ dissolution, the low hysteresis and high energy suggest that a Cu-based fluoride cathode remains an intriguing candidate for rechargeable lithium batteries. © 2015 Macmillan Publishers Limited
URI
http://pr.ibs.re.kr/handle/8788114/2086
DOI
10.1038/ncomms7668
ISSN
2041-1723
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
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