Department of Physics, National University of Singapore , 2 Science Drive 3, Singapore 117551.
ACS Appl Mater Interfaces. 2013 Oct 23;5(20):9957-63. doi: 10.1021/am401779p. Epub 2013 Oct 7.
In this work, the electrochemical performance of NiFe2O4 nanofibers synthesized by an electrospinning approach have been discussed in detail. Lithium storage properties of nanofibers are evaluated and compared with NiFe2O4 nanoparticles by galvanostatic cycling and cyclic voltammetry studies, both in half-cell configurations. Nanofibers exhibit a higher charge-storage capacity of 1000 mAh g(-1) even after 100 cycles with high Coulmbic efficiency of 100% between 10 and 100 cycles. Ex situ microscopy studies confirmed that cycled nanofiber electrodes maintained the morphology and remained intact even after 100 charge-discharge cycles. The NiFe2O4 nanofiber electrode does not experience any structural stress and eventual pulverisation during lithium cycling and hence provides an efficient electron conducting pathway. The excellent electrochemical performance of NiFe2O4 nanofibers is due to the unique porous morphology of continuous nanofibers.
在这项工作中，详细讨论了通过静电纺丝方法合成的 NiFe2O4 纳米纤维的电化学性能。通过恒电流循环和循环伏安法研究，在半电池配置中评估了纳米纤维与 NiFe2O4 纳米粒子的储锂性能，并进行了比较。纳米纤维甚至在 100 次循环后仍具有 1000 mAh g(-1) 的高电荷存储容量，在 10 至 100 次循环之间具有 100%的高库仑效率。原位显微镜研究证实，即使在 100 次充放电循环后，循环纳米纤维电极仍保持形态且完整。在锂循环过程中，NiFe2O4 纳米纤维电极不会经历任何结构应力和最终的粉碎，从而提供了有效的电子传导途径。NiFe2O4 纳米纤维的优异电化学性能归因于连续纳米纤维的独特多孔形态。
