Skip to main content
SLU publication database (SLUpub)

Abstract

Nanoparticles (NPs) of g-Fe2O3 are successfully prepared via facile hydrolysis of a complex iron iodide precursor with subsequent oxidation under mild conditions. When evaluated as an anode material in lithium ion half-cells, electrodes made with gamma-Fe2O3 NPs exhibit excellent rate capabilities with high capacities and good coulombic efficiencies. Electrodes of gamma-Fe2O3 NPs initially deliver capacities of 1100 mA h g1 at 100 mA g1 current density and 980 mA h g1 at 1000 mA g1. Following an activation step of the electrodes, the capacities increase by up to 300 mA h g1 while coulombic efficiencies also improve slightly. At a high current density of 4000 mA g1, a stable capacity of 770 mA h g1 is achieved. In this study, dQ/dv plots are employed to graphically illustrate the capacity breakdown of each cycle into intercalation, conversion, and extra capacity regions. Upon prolonged cycling, the extra capacity region expands to yield higher capacities; this phenomenon has been attributed to both pulverizationinduced particle size reduction and high-rate lithiation-induced activation processes. This study concludes that gamma-Fe2O3 NPs could serve as a promising anode material with comparable results to widely studied alpha-Fe2O3 and Fe3O4 NPs.

Keywords

Li-ion batteries; anode materials; nanostructured electrode; electrochemical performance; thermal stability

Published in

Journal of Materials Chemistry A
2016, volume: 4, number: 46, pages: 18107-18115

SLU Authors

  • Daniel, Geoffrey

    • Department of Forest Products, Swedish University of Agricultural Sciences

  • Kessler, Vadim

    • The Department of Chemistry and Biotechnology, Swedish University of Agricultural Sciences

  • Seisenbaeva, Gulaim

    • The Department of Chemistry and Biotechnology, Swedish University of Agricultural Sciences

UKÄ Subject classification

Materials Chemistry
Inorganic Chemistry
Nano Technology

Publication identifier

  • DOI: https://doi.org/10.1039/c6ta08139h

Permanent link to this page (URI)

https://res.slu.se/id/publ/80508