New LiFePO4 composite for Lithium-ion batteries

TEHRAN, Aug. 13(MNA) – A new composite developed by Dr. Mehran Javanbakht has improved the lower power voltage and poor rate capability in Lithium-ion batteries.

Lithium-ion batteries could be more efficient thanks to the new composite developed by Dr. Mehran Javanbakht, a researcher and faculty member at Amirkabir University of Technology, Iran.

Funded by Iran National Science Foundation (INSF), the new composite was developed to tackle the problems of lower power voltage and poor rate capability in LiFePO4 batteries, which could hinder their commercial application.

To develop the composite, phospho-olivine LiFePO4 microcrystals were prepared by a simple hydrothermal synthesis route to provide a facile method for the preparation of LiFePO4 cathode materials with well-developed rhombohedral morphology. Synthesis was carried out in the presence of poly ethylene glycol (PEG), which acted as a carbon source, structure oriented agent and surface-modifying reagent. The size and morphology of LiFePO4 was significantly affected by the concentration of polyethylene glycol in the precursor solution.

The results of the study indicates that PEG addition considerably improves the kinetics in terms of capacity of delivery. In addition, the size of the growing crystallites could be easily controlled by varying the PEG concentration, which spatially confined LiFePO4 crystal growth. The electro-chemical characteristic of the resulting composite is significantly desirable with regard to capacity and speed. Furthermore, the composite creates a desirable charge-discharge speed density with the discharge capacity of 153 mAh/g (2C).

This research resulted in the three papers published in Journal of Power Sources, Journal of Alloys and Compounds, and Int. J. Electrochem. Sci.

News Code 109216

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