Abstract
A sol―gel method based on citric acid was employed to prepare Li 2 FeSiO 4 as a cathode material for lithium-ion batteries. The citric acid acts as both a chelating agent and a carbon source in the synthetic process. The obtained Li 2 FeSiO 4 has a monoclinic unit cell in space group P2 1 . The average size of Li 2 FeSiO 4 particles is approximately 80 nm. The maximum discharge capacity of 153.6 mAh g ―1 is observed in the third cycle, and 98.3% of the maximum discharge capacity is retained after 80 charge― discharge cycles.
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