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Na-rich layered oxides as cathode materials for sodium-ion batteries were designed using an electrochemical method based on Li-rich layered oxides. The materials show high specific capacity that can reach 234mAh/g at a current of 5mA/g. The energy density of this material (644Wh/kg) is even higher than those of commercial cathodes for lithium-ion batteries, such as LiFePO 4 and LiMn 2...
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