Journal
ADVANCED SCIENCE
Volume 9, Issue 21, Pages -Publisher
WILEY
DOI: 10.1002/advs.202201419
Keywords
conversion cathodes; electrolyte decomposition; lithium-ion batteries; long cycle lifetime; stable Fe3O4 layers
Categories
Funding
- National Natural Science Foundation of China [51971245, 52022088, 51772262, 21406191, U20A20336, 21935009, 52002346]
- Fok Ying-Tong Education Foundation of China [171064]
- Natural Science Foundation of Hebei Province [F2021203097, B2020203037, B2018203297]
- Hunan Innovation Team [2018RS3091]
- Science and Technology Innovation Program of Hunan Province [2020RC2079, 2021RC3109]
Ask authors/readers for more resources
This study reports a composite cathode material FeF2@PDC composed of metal fluoride FeF2 and polymer-derived carbon PDC. The composite cathode exhibits excellent cycling performance and long lifespan, and can be cycled at high rates while preventing electrolyte decomposition.
Metals fluorides (MFs) are potential conversion cathodes to replace commercial intercalation cathodes. However, the application of MFs is impeded by their poor electronic/ionic conductivity and severe decomposition of electrolyte. Here, a composite cathode of FeF2 and polymer-derived carbon (FeF2@PDC) with excellent cycling performance is reported. The composite cathode is composed of nanorod-shaped FeF2 embedded in PDC matrix with excellent mechanical strength and electronic/ionic conductivity. The FeF2@PDC enables a reversible capacity of 500 mAh g(-1) with a record long cycle lifetime of 1900 cycles. Remarkably, the FeF2@PDC can be cycled at a record rate of 60 C with a reversible capacity of 107 mAh g(-1) after 500 cycles. Advanced electron microscopy reveals that the in situ formation of stable Fe3O4 layers on the surface of FeF2 prevents the electrolyte decomposition and leaching of iron (Fe), thus enhancing the cyclability. The results provide a new understanding to FeF2 electrochemistry, and a strategy to radically improve the electrochemical performance of FeF2 cathode for lithium-ion battery applications.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available