Journal of Materials Chemistry · 2011 · 49 citations · 17 references
Natural SciencesMaterials EngineeringMaterials ScienceElectrochemical EngineeringElectrochemistrySurface ScienceBattery MaterialsCathode MaterialsElectrochemical CellsElectrochemical Energy StorageElectrode MaterialsEnergy StorageLithium-ion Battery Cathode MaterialsLithium-ion Battery ChemistryLithium-ion Battery Electrodes Based On Metal OxidesLithium-ion Battery MaterialsRetention RatesSolid-state Battery MaterialsSurface Residue ModificationSurface Topography Modification
LiCoPO4 and Li1.02(Co0.9Fe0.1)0.98PO4 were prepared by conventional solid state reactions. The surface modification of Li1.02(Co0.9Fe0.1)0.98PO4 particulates by LiFePO4 was successfully carried out by a dry coating procedure. TEM analysis confirmed the presence of a LiFePO4 coating layer of about 20 nm on the surface of the Li1.02(Co0.9Fe0.1)0.98PO4 particles. All three cells delivered high initial discharge capacities of 122, 130 and 128 mA h g−1 for LiCoPO4, Li1.02(Co0.9Fe0.1)0.98PO4, and LiFePO4 modified Li1.02(Co0.9Fe0.1)0.98PO4, respectively. However, these cells presented quite different cycle retention rates after 20 cycles, 21, 22 and 70% for LiCoPO4, Li1.02(Co0.9Fe0.1)0.98PO4, and LiFePO4 modified Li1.02(Co0.9Fe0.1)0.98PO4, respectively. The improved cycle retention of the LiFePO4-modified Li1.02(Co0.9Fe0.1)0.98PO4 resulted from its reduced reactivity towards the electrolyte and the effective prevention of resistive layer formation on the LiCoPO4 surface during high voltage cycling.
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P. Subramanya Herle, B. Ellis, N.D. Coombs et al. · Nature Materials · 2004 · 1.1K citations
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Natural Sciences, Materials Engineering, Materials Science +17