Title

Solvent-assisted molten salt process: A new route to synthesise alpha-Fe2O3/C nanocomposite and its electrochemical performance in lithium-ion batteries

RIS ID

32916

Publication Details

Hassan, M., Md. Mokhlesur Rahman, , Guo, Z., Liu, H. K. and Chen, Z. (2010). Solvent-assisted molten salt process: A new route to synthesise α-Fe2O3/C nanocomposite and its electrochemical performance in lithium-ion batteries. Electrochimica Acta, 55 (17), 5006-5013.

Abstract

Nanostructured α-Fe2O3 was synthesised by a simple molten salt process using FeCl2·4H2O as a starting material and LiNO3–LiOH·H2O–H2O2 as a eutectic mixture at 300 °C. To synthesise α-Fe2O3/C composite, both α-Fe2O3 and malic acid were dispersed together in toluene, where malic acid was used as a carbon source. The morphology and microstructure of both compounds were confirmed by X-ray diffraction, Raman spectroscopy and transmission electron microscopy. Electrochemical testing, including constant current charge–discharge and cyclic voltammetry (CV), was carried out. The α-Fe2O3/C composite anode exhibited much better electrochemical performance than the bare α-Fe2O3. The discharge capacities of the composite were measured to be 2112 mAh g−1 at C/2 after 100 cycles and 584 mAh g−1 at 20 C after 10 cycles. The superior electrochemical performance of α-Fe2O3/C composite can be mainly attributed to the combined effects of the nanostructure, the carbon layering on the α-Fe2O3 nanoparticles, and the porous ultra-fine carbon matrix, where the three factors would contribute to provide high electronic conductivity, reduce the traverse time of electrons and lithium-ions, and could also prevent high volume expansion of the anode film during cycling. Our results indicate that the prepared α-Fe2O3/C nanocomposite is a very promising anode material for Li-ion power batteries.

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Link to publisher version (DOI)

http://dx.doi.org/10.1016/j.electacta.2010.04.006