Abstract
LiFePO4/Carbon nanocomposite was synthesised by two-step procedure ̶ hydrothermal synthesis in the presence of ascorbic acid followed by mixing of the product with citric acid and heating at 600°C under a reducing atmosphere. During the first-step, slab or cuboid-shaped LiFePO4 particles were formed with sizes of ∼100–150nm in width and ∼300–600nm in length. The second-step produced deformed slab or cuboid-like LiFePO4/Carbon nanocomposite with shapes somewhat resembling that of the precursor. The electrochemical properties were examined by electrochemical impedance spectroscopy (EIS) and potentiostatic intermittent titration technique (PITT) at a series of equilibrium potentials within the voltage range 2.7–4.2V. From the PITT measurements of cathodes with two thicknesses, the LiFePO4/Carbon nanocomposite exhibits a specific discharge capacity of 150.3mAh/g and 164.3mAh/g, for 9.4μm and 6.9μm thickness, respectively. The current relaxation measurements also showed that the kinetics of Li-ion transfer depends strongly on the phase composition; in the solid-solution regions the Li-ion kinetics is dominated by diffusion whereas in the two-phase region it is by phase transformation.
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