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

Feng Wang (), Sung-Wook Kim, Dong-Hwa Seo, Kisuk Kang, Liping Wang, Dong Su, John J. Vajo, John Wang and Jason Graetz
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Feng Wang: Brookhaven National Laboratory
Sung-Wook Kim: Brookhaven National Laboratory
Dong-Hwa Seo: Research Institute of Advanced Materials, Seoul National University
Kisuk Kang: Research Institute of Advanced Materials, Seoul National University
Liping Wang: Brookhaven National Laboratory
Dong Su: Center for Functional Nanomaterials, Brookhaven National Laboratory
John J. Vajo: Sensors and Materials Laboratory, HRL Laboratories, LLC
John Wang: Sensors and Materials Laboratory, HRL Laboratories, LLC
Jason Graetz: Brookhaven National Laboratory

Nature Communications, 2015, vol. 6, issue 1, 1-9

Abstract: 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 (M1yM21-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 (

Date: 2015
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DOI: 10.1038/ncomms7668

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