Electrochemistry Communications · 2012 · 355 citations · 17 references
Natural SciencesChemistryMaterials ScienceElectrochemistryMaterials ChemistrySolid-state ChemistryBattery Cell ChemistryBattery MaterialsCathode MaterialsElectrochemical Energy StorageElectrode MaterialsRedox-active MaterialsCathode Crystal StructureElectrochemical CharacterizationRechargeable BatteriesSodium-ion BatteriesSodium-ion Battery ElectrodesSodium-ion Battery MaterialsSodium-ion CathodesTriclinic Unit Cells
Extending the pyrophosphate chemistry for rechargeable Na-ion batteries, here we report the synthesis and electrochemical characterization of Na2FeP2O7, a novel Fe-based cathode material for sodium batteries. Prepared by conventional solid-state as well as solution-combustion synthesis (at 600 °C), the Na2FeP2O7 adopts a triclinic structure (space group: P-1) with three-dimensional channels running along [100], [− 110] and [01-1] directions. With no further optimization, the as-synthesized Na2FeP2O7 cathode was found to be electrochemically active, delivering a reversible capacity of 82 mAh·g− 1 with the Fe3 +/Fe2 + redox potential centered around 3 V (vs. Na/Na+). With its theoretical capacity of ~ 100 mAh·g− 1 and potential high rate-capability, Na2FeP2O7 forms a promising novel cathode material, with the distinction of being the first ever pyrophosphate-class of cathode for sodium-ion batteries.
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Electrochemical intercalation of sodium in NaxCoO2 bronzes
Claude Delmas, J.J. Braconnier, Cl. Fouassier et al. · Solid State Ionics · 1981 · 884 citations