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A NASICON‐Type Positive Electrode for Na Batteries with High Energy Density: Na<sub>4</sub>MnV(PO<sub>4</sub>)<sub>3</sub>
194
Citations
53
References
2018
Year
EngineeringMaterial Na 4Na BatteriesChemical EngineeringSodium BatterySodium-ion BatteriesMaterials SciencePo 4Electrical EngineeringBattery Electrode MaterialsAdvanced Electrode MaterialEnergy StorageHigh Energy DensityElectrochemistryElectric BatteryNasicon‐type Positive ElectrodeLi-ion Battery MaterialsCathode MaterialsElectrochemical Energy StorageBatteriesMixed Mn 2+
Abstract The mixed Mn 2+ /V 3+ Na‐super‐ionic‐conductor (NASICON) cathode material Na 4 MnV(PO 4 ) 3 is prepared by solid‐state reaction at 800 °C under argon. When used as a positive electrode in Na batteries, this material can exchange three electrons for two transition metals, that is, yielding a high gravimetric capacity of 156 mAh g −1 on charge when the upper cutoff voltage is set to 4.3 V versus Na + /Na. Operando X‐ray diffraction during battery operation is performed and it is shown that the mechanisms of Na + insertion/extraction are single or biphasic depending on the electrochemical cycling conditions.
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