The effect of carbon coating on the electrochemical performance of nanosized Li<inf>2</inf>FeSiO<inf>4</inf> cathode materials

Publication Type:
Journal Article
Citation:
Acta Physica Polonica A, 2013, 123 (2), pp. 279 - 282
Issue Date:
2013-02-01
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Carbon-coated Li2FeSiO4/C cathode materials have been synthesized through a modified ball-milling pro- cess. The physical characterizations of Li2FeSiO4 were conducted by using X-ray powder diffraction, field-emission scanning electron microscopy and transmission electron microscopy techniques. Field-emission scanning electron microscopy and transmission electron microscopy images revealed that Li2FeSiO4/C consists of nanosized parti- cles coated with an amorphous carbon layer. The electrochemical performances of Li2FeSiO4/C cathode materials were evaluated through fully assembled lithium batteries via cyclic voltammetry, charge/discharge test and electro- chemical impedance spectroscopy. The Li2FeSiO4/C cathode materials showed a much improved electrochemical performance in terms of higher specific capacity, better cycling performance and less charge transfer resistance than that of the pristine Li2FeSiO4.
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