【摘 要】
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The NbO electrode materials were successfully synthesized by high-temperature solid-phase method using Nb powders and Nb2O5 powders as raw materials.The crystal
【机 构】
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School of Materials Science and Engineering, Central South University, Changsha 410083, China;Hunan
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The NbO electrode materials were successfully synthesized by high-temperature solid-phase method using Nb powders and Nb2O5 powders as raw materials.The crystalline structure,morphology,and electrochemical properties of the obtained materials were characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM),dynamic light scattering instrument (DLSA),halfcell charge-discharge tests,and cyclic voltammetry (CV).The reaction mechanism of lithium with NbO was investigated by ex-situ XRD studies.The results show that material average Li storage voltage is nearly located at 1.6 V,and the lithium intercalation into NbO remains a single-phase process.For the first discharge,a capacity of 355 mAh·g-1 is obtained at a current rate of 0.1C,and 293 mAh·g-1 is maintained after 50 cycles,whereas a capacity of 416 mAh·g-1 is obtained at a current rate of 0.1C after ball milling.And 380mAh·g-1 reversible capacity remains for the ball milling sample.
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