2 research outputs found
In Situ Grown Fe<sub>2</sub>O<sub>3</sub> Single Crystallites on Reduced Graphene Oxide Nanosheets as High Performance Conversion Anode for Sodium-Ion Batteries
Electrochemical
conversion reactions of metal oxides provide a new avenue to build
high capacity anodes for sodium-ion batteries. However, the poor rate
performance and cyclability of these conversion anodes remain a significant
challenge for Na-ion battery applications because most of the conversion
anodes suffer from sluggish kinetics and irreversible structural change
during cycles. In this paper, we report an Fe<sub>2</sub>O<sub>3</sub> single crystallites/​reduced graphene oxide composite (Fe<sub>2</sub>O<sub>3</sub>/rGO), where the Fe<sub>2</sub>O<sub>3</sub> single
crystallites with a particle size of ∼300 nm were uniformly
anchored on the rGO nanosheets, which provide a highly conductive
framework to facilitate electron transport and a flexible matrix to
buffer the volume change of the material during cycling. This Fe<sub>2</sub>O<sub>3</sub>/rGO composite anode shows a very high reversible
capacity of 610 mAh g<sup>–1</sup> at 50 mA g<sup>–1</sup>, a high Coulombic efficiency of 71% at the first cycle, and a strong
cyclability with 82% capacity retention after 100 cycles, suggesting
a potential feasibility for sodium-ion batteries. More significantly,
the present work clearly illustrates that an electrochemical conversion
anode can be made with high capacity utilization, strong rate capability,
and stable cyclability through appropriately tailoring the lattice
structure, particle size, and electronic conduction channels for a
simple transition-metal oxide, thus offering abundant selections for
development of low-cost and high-performance Na-storage electrodes