Journal of The Electrochemical Society · 2011 · 660 citations · 48 references
Natural SciencesChemical EngineeringMaterials ScienceElectrochemical EngineeringElectrochemistryInorganic ChemistryBattery Cell ChemistryBattery MaterialsBattery SystemsElectrochemical CellsElectrochemical Energy StorageElectrode MaterialsDischarge CapacityHysteresisLithium Intercalation CompoundsSodium Intercalation CompoundsSodium-ion BatteriesSodium-ion Battery AnodesSodium-ion Battery ElectrodesSodium-ion Battery Materials
Monoclinic α‑NaMnO₂ is re‑investigated electrochemically as a positive electrode material for sodium‑ion batteries. About 0.85 Na can be deintercalated from NaMnO₂ and 0.8 Na can be re‑intercalated during potentiostatic intermittent charge and discharge. Galvanostatic cycling between 2.0 V and 3.8 V yields 185 mAh g⁻¹ discharge capacity in the first cycle at C/10, dropping to 132 mAh g⁻¹ after 20 cycles, with pronounced hysteresis compared to lithium intercalation compounds and a notable difference from layered LiMnO₂ upon alkali removal.
Monoclinic α- NaMnO2 is re-investigated electrochemically as a positive electrode material for sodium ion batteries. About 0.85 Na can be deintercalated from NaMnO2 and 0.8 Na be intercalated back during potentiostatical intermittent charge and discharge. Galvanostatical cycling between 2.0 V and 3.8 V gives 185 mAh/g discharge capacity for the first cycle at C/10 rate and 132 mAh/g remains after 20 cycles. Charge and discharge curves are significantly different indicating more hysteresis than is typical for lithium intercalation compounds. We also explain the remarkable difference between layered LiMnO2 and NaMnO2 upon alkali removal.
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