Electrochemistry · 2018 · 17 citations · 14 references
Natural SciencesMaterials EngineeringMaterials ScienceElectrochemical EngineeringElectrochemistryEnergy MaterialsBattery Cell ChemistryBattery MaterialsElectrochemical CellsElectrochemical Energy ConversionElectrochemical Energy StorageElectrode MaterialsCharge-discharge CyclingElectrochemical CharacterizationRechargeable BatteriesSodium-ion BatteriesSodium-ion Battery ElectrodesSodium-ion Battery MaterialsSodium-ion CathodesVoltage
We investigated NaCuO2 as a positive electrode material for sodium-ion energy storage batteries. Its charge/discharge properties in a Na/NaCuO2 cell were evaluated in voltage ranges of 0.75–3.0, 1.7–4.2, and 0.75–4.2 V. It was found that the charge/discharge properties and cycling-induced new products depended on the voltage range. In the range of 0.75–4.2 V, NaCuO2 showed a reversible capacity of 190 mAh/g after ten cycles, with an average voltage of 2.5 V versus Na/Na+. The results of an ex-situ XRD analysis of NaCuO2 electrode at various charged/discharged stages revealed that NaCuO2 is converted to NaCuO after the second cycle, and then, reversible structural changes occur between NaCuO and CuO.
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