New Iron-Based Intercalation Host for Lithium-Ion Batteries

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Title
New Iron-Based Intercalation Host for Lithium-Ion Batteries
Author(s)
Sung-Kyun Jung; Insang Hwang; Sung-Pyo Cho; Kyungbae Oh; Kyojin Ku; Il Rok Choi; Kisuk Kang
Publication Date
2018-03
Journal
CHEMISTRY OF MATERIALS, v.30, no.6, pp.1956 - 1964
Publisher
AMER CHEMICAL SOC
Abstract
The discovery of high-performance cathode materials is imperative for advances in current lithium-ion battery technology. Although extensive efforts have been focused on developing novel cathode materials, it has been a grand challenge to find candidates that can outperform state-of-the-art cathode materials such as layered, olivine, and spinel lithium transition-metal oxides. This issue arises because there are only a limited number of intercalation hosts with appropriate redox potential and lithium solubility. Here, we present a new iron-based intercalation host for lithium ion by exploring the host formation reaction from the nanocomposite of lithium and transition-metal compound hosts (i.e., LiF and FeO). Fluoride ions released from LiF decomposition during charging induce an unexpected phase transition of FeO to a new host structure of cubic-FeOF, a new polymorphic structure of FeOF that is different from the well-known rutile-FeOF. Cubic-FeOF electrode exhibits a higher redox potential (3.2 V) including lower voltage hysteresis and more extended stability of the structure than those of the rutile-FeOF undergoing partial lithiation followed by the conversion reaction. The discovery of new intercalation host from the host formation reaction of the nanocomposite suggests a new unexplored avenue in the development of novel cathode materials for lithium-ion batteries. © 2018 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/4648
ISSN
0897-4756
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
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