Nanofibers-NiCo2O4 : fabrication and Li-storage properties
Sharma, Yogesh Kumar
Date of Issue2012
Solid State Physics Symposium (56th : 2011 : Tamilnadu, India)
School of Materials Science and Engineering
Nano-size particles and composites as anode materials have been explored in recent years in order to reduce the cost, improve the capacity as well as cycle-life of the Lithium ion batteries (LIBs). In view of same, the nanofibers of spinel-NiCo2O4 are prepared by easy, viable and cost effective electrospinning technique. The as spunned nanofibers composed of polymer solution and metal precursors are sintered at various temperature, and 5000C. 2h is found to be the appropriate to get best crystalline nanofibers of spinel-NiCo2O4. The structural, morphological and thermal characterizations are carried out by XRD, FESEM, TGA, respectively. The Li-storage and cycling properties of optimized nano-fibers of NiCo2O4 are examined by means of galvanostatic cycling and cyclic voltammetry. The spinel-NiCo2O4 delivers the first discharge and charge capacities of 1220(±10) mAhg−1 and 910(±10) mAhg−1 that corresponds the consumption of 11.0 and 8.2 mole of Li, respectively. The cyclic voltammetry studies reveal the average charge and discharge potentials of ∼2.2 and ∼0.9 V, respectively. Based on galvanostatic cycling, cyclic voltammetry and ex-situ studies like XRD, TEM and SAED, a plausible reaction mechanism is proposed.
© 2012 American Institute of Physics. This paper was published in Solid State Physics: Proceedings of the 56th DAE Solid State Physics Symposium 2011 and is made available as an electronic reprint (preprint) with permission of American Institute of Physics. The paper can be found at the following official DOI: [http://dx.doi.org/10.1063/1.4710031]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.