Ternary Metal Fluorides As High-Energy Cathodes with Low Cycling Hysteresis
The Li storage/release mechanisms and limits to cycling stability of CuyFe1-yF2 were investigated by combining electrochemical measurement with comprehensive structural and chemical analysis using in-situ X-ray absorption spectroscopy, X-ray diffraction, and transmission electron microscopy-electron energy loss spectroscopy (TEM-EELS). The lithium reaction process is much more complicated in CuyFe1-yF2 than the binary metal counterparts (i.e. FeF2, CuF2) [2-4]. Some of the recent results on synthesis, structural and electrochemical characterization of the ternary metal fluorides will be presented. Detailed lithium reaction mechanisms, and Cu-loss related issues along with possible remedy solutions in the CuyFe1-yF2system, will be discussed.
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