Carbon nanofibers impregnated with Fe3O4 nanoparticles as a flexible and high capacity negative electrode for lithium-ion batteries
By Vel
Published in Journal of Alloys and Compounds
Journal of Alloys and Compounds
2020
Abstract
The development of E-textiles requires portable devices for energy storage that do not compromise the comfort and functionality of the textile. In this work, a flexible carbon electrode, obtained by impregnation of magnetite nanoparticles (Fe3O4-NPs) on electrospinning carbon nanofibers (CNFs), was developed as a negative electrode for lithium batteries. The active anodic material was characterized by Raman spectroscopy, thermogravimetric analyses (TGA), transmission electron microscopy (TEM) and electrochemical techniques. TEM images showed that Fe3O4-NPs particles, 32 nm in size, are well adsorbed on 400 nm CNFs. The electrochemical tests indicate that the presence of Fe3O4-NPs improves the electrochemical performance of the CNFs, achieving an initial high discharge capacity of 1146 mAh g?1, superior to that exhibited for pure CNFs (480 mAh g?1). Also, higher coulombic efficiency (90%) was exhibited by the composite active material. However, a slight reduction of capacity retention at high C-rates was observed in the composite due to the lower electronic conductivity of Fe3O4-NPs.