The Journal of Physical Chemistry C · 2012 · 72 citations · 30 references
Natural SciencesMaterials EngineeringMaterials ScienceCrystal StructureElectrochemistryMaterials ChemistryBattery MaterialsBattery TechnologyCathode MaterialsElectrode MaterialsEnergy StorageEnergy Storage MaterialsCathode Crystal StructureLithium-ion BatteriesLithium-ion Battery Cathode MaterialsLithium-ion Battery MaterialsPowder DiffractionPowder Diffraction AnalysisPowder X-ray DiffractionX-ray Absorption Spectroscopy
The mechanism of enhancing the capacity of the LiFePO 4 cathodes in lithium ion batteries by the addition of a small amount of vanadium, which locate on the lithium site and induce lithium vacancies in the crystal structure, is reported in this article. As a result, the capacity increases from 138 mAh/g found for pristine LiFePO 4 to 155 mAh/g for the V-added compound, and the conductivity increases from 4.75 × 10 –4 S/cm for the LiFePO 4 without V addition to 1.9 × 10 –2 S/cm for the V-added compound. A possible model to facilitate the enhancement of conductivity and capacity is described with evidence supported by X-ray powder diffraction, X-ray absorption spectroscopy, and neutron powder diffraction data.
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