a-Fe2O3 as an anode material with capacity rise and high rate capability for lithium-ion batteries

Authors

Mohd Faiz HassanFollow
Zaiping Guo, University of WollongongFollow
Z. Chen, University of WollongongFollow
Hua-Kun Liu, University of WollongongFollow

RIS ID

44878

Publication Details

Hassan, M. Faiz., Guo, Z., Chen, Z. Liu, H. (2011). a-Fe₂O₃ as an anode material with capacity rise and high rate capability for lithium-ion batteries. Materials Research Bulletin, 46 (6), 858-864.>

Abstract

We report a simple molten salt method to prepare nanosize α-Fe₂O₃, as well as its electrochemical performance as anode material for lithium ion batteries. The structure and morphology were confirmed by Raman spectroscopy, X-ray diffraction, and transmission electron microscopy. The as-prepared α-Fe₂O₃ is a rhombohedral phase of hematite with crystal size in the range of 20–40 nm. The electrochemical measurements were performed using the as-prepared powders as the active material for a lithium-ion cell. The nanosized α-Fe₂O₃ shows excellent cycling performance and rate capability. It also exhibits the feature of capacity increase upon cycling. The outstanding electrochemical performance of the α-Fe₂O₃ can be related to several factors, namely, the short Li⁺ diffusion length along the porous rhombohedral structures and the nanosized nature of the materials, which decreases the traverse time for electrons and Li⁺ ions, and reduces the volume expansion to some extent during charge/discharge reactions.