NaV3O8 with superior rate capability and cycle stability as cathode materials for sodium-ion batteries
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Development of novel cathode materials for sodium-ion batteries with high capacity and excellent cyclic performance is an exciting and demanding research direction. Herein, we demonstrate the synthesis of NaV3O8 via a rheological phase reaction method. The crystal structure and morphology of synthesized NaV3O8 were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The NaV3O8 powder, calcined at moderate temperature (350 °C) with more uniform and smaller nanorod/nanoplate morphology, and larger d001 spacing, exhibited excellent electrochemical performance as cathode material in sodium ion batteries. A specific discharge capacity of 120 mAh g−1 was achieved at the current density of 120 mA g−1, with exceptional cyclic performance (discharge capacity of 95 mAh g−1 at the 500th cycle). In addition, the NaV3O8 cathode demonstrated excellent rate capability and delivered specific capacity of 80.8 mAh g−1 at current density of 300 mA g−1. The superior electrochemical performance corresponds to the structural stability and faster ionic diffusion. The preliminary results indicate that NaV3O8 can be an alternative cathode material for high-performance sodium-ion batteries.
KeywordsNaV3O8 Cathode materials Enhanced electrochemical performances Sodium-ion batteries
This work was supported by National Natural Science Foundation, China (Nos. 21403057, 21773057, and U1704142), Program for Innovative Team (in Science and Technology) in University of Henan Province, China (No. 17IRTSTHN003), Program for Science and Technology Innovation Talents in Universities of Henan Province, China (No. 18HASTIT008), Cultivation Plan for Young Core Teachers in Universities of Henan Province, China (No. 2016GGJS-068), Natural Science Foundation of Henan Province, China (No. 162300410050), Key Science and Technology Project of Henan Province, China (No. 162102210187), and Program for Henan Science and Technology Open and Cooperation Project, China (No. 172106000060).
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