超薄纳米花二硒化钼的制备及储钠性能研究

Synthesis and Sodium Storage Properties of Ultrathin MoSe;Nanoflowers

目的:为缓解电池容量衰减,提升电池循环稳定性,通过制备不同形貌及结构的MoSe_(2)得到优异的钠离子电池。方法:利用溶剂热和高温煅烧法,通过控制煅烧时间,制备不同形貌的MoSe_(2)。并利用纳米花活性材料中,超薄纳米片具有高表面活性位点的原理,提高电极材料与电解液的接触面积,增强钠离子的可逆脱嵌反应,从而获得稳定的电池循环性能。结果:所有制备的样品中,所得超薄纳米片自组装的MoSe_(2)纳米花,电池循环性能最佳:在500 mA/g电流密度下循环200圈后容量仍可保持在362 mAh/g,每圈的衰减率仅0.06%。结论:所制备的MoSe_(2)纳米花可作为循环稳定性能优异的钠离子电池负极材料,为后续研究提供依据。

Objective: To reduce battery capacity attenuation and improve battery circle stability, MoSe_(2)with different morphalogy was and stnceture was prepared to obtain better performance of sodium ion battery.Methods: MoSe_(2)nanomaterials with different morphology were prepared by solvothermal and high temperature calcination method within controlling calcination time. In addition, the ultra-thin nanosheets in nanoflowers have high surface active sites, which can improve the contact area between electrode materials and electrolyte and enhance the reversible insertion/extraction reaction of sodium ions, thus obtaining stable battery cycling performance. Results: Among all the samples, the MoSe_(2)nanoflowers self-assembled by ultrathin nanosheets have the best stability performance, at the current density of 500 mA/g, the capacity can still be maintained at 362 mAh/g after 200 cycles, and the attenuation rate of each cycle is only 0.06%. Conclusion: The ultrathin MoSe_(2)nanoflowers prepared by this method can be used as the anode material for sodium ion batteries with excellent cycling stability, which provides basis for subsequent research.