Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5439005 | Ceramics International | 2017 | 30 Pages |
Abstract
Low intrinsic electronic conductivity is the main disadvantage of LiFePO4 when used as a cathode material in lithium ion batteries. The paper offers experimental proofs of the theoretical prediction that fluorine doping of LiFePO4 can enhance its electrical conductivity. The LiFePO4 and fluorine-doped LiFePO4 olivine type, carbon-free powders are synthesized and examined. The crystal structure refinements in the Pnma space group reveal that doping with fluorine ions preserves the olivine structure, while reducing both the lattice parameters and the antisite defect, and increasing the crystallite size. A small amount of incorporated fluorine enhances the electrical conductivity from 4.6Ã10â7Â SÂ cmâ1 to 2.3Ã10â6Â SÂ cmâ1 and has a positive impact on the electrochemical performance. Several spectroscopy techniques (Mössbauer, FTIR, and Raman) reveal differences between the two powders and additionally support the findings of both the Rietveld refinement and the conductivity measurements.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Dragana JugoviÄ, Miodrag MitriÄ, MiloÅ¡ MiloviÄ, Nikola CvjetiÄanin, Bojan JokiÄ, Ana UmiÄeviÄ, Dragan UskokoviÄ,