Electrospun synthesis and electrochemical property of zinc ferrite nanofibers
Electrospun synthesis and electrochemical property of zinc ferrite nanofibers
复制标题
铁酸锌纳米纤维的静电纺合成及其电化学性能
作者：
费雅倩;陈克;崔荣荣;魏取福
本研究采用静电纺丝和焙烧相结合的方法成功制备了铁酸锌(ZnFe2O4)纳米纤维。从X-射线衍射仪上只能观察到ZnFe2O4的衍射峰，表明形成了纯化合物。扫描电子显微镜和透射电子显微镜照片表明，所制得的纳米纤维具有良好的连续纤维形态，平均直径约为150 nm。储锂性能测试表明，所制备的纳米纤维具有明显的电化学性能。结果表明，纳米纤维电极不仅首次放电容量高达1248mAhg−1左右，而且经过50次循环后容量稳定在625mAhg−1左右。同时，电极在较高的放电率和充电率下表现出高容量。纳米纤维电极优异的储锂性能可能归功于其高结晶度以及独特的介孔和纤维结构。此外，锌铁氧体与锂的转化反应生成的锌产物还可以进一步与锂反应生成锌锂合金，从而增加电池的容量。
In this study, zinc ferrite (ZnFe2O4) nanofibers were successfully fabricated by a combination of electrospinning and calcination process. Only peaks of ZnFe2O4could be observed from X-ray diffractometry patterns, indicating that the formation of pure compound. SEM and TEM images showed the ZnFe2O4nanofibers possessed good continuous fiber morphology with an average diameter of about 150 nm. Moreover, the lithium storage properties test showed that the ZnFe2O4nanofibers possessed obviously improved electrochemical properties. It is demonstrated that ZnFe2O4nanofibers electrode not only deliver a high initial discharge capacity of around 1248 mAh g−1, but also maintained a stable capacity of 625 mAh g−1after 50 cycles. Meanwhile, the electrodes showed high capacity at higher discharge and charge rate. The excellent lithium storage properties of the ZnFe2O4nanofibers electrode may be attributed to the high crystallinity, as well as the unique mesoporous and fibrous structures. In addition, the Zn product formed after the conversion reaction of ZnFe2O4with lithium could further react with lithium to form ZnLixalloy, which could contribute additional capacity.
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