Abstract
Iron trifluoride (FeF3 ) has been actively studied as an alternative cathode material due to its cost effectiveness, low toxicity, and high theoretical capacities of 237 and 712 mAhg −1 at 2.0−4.5 V and 1.5−4.5 V, respectively. In spite of these advantages, FeF3 has serious shortcomings of poor electronic conductivity and a slow diffusion rate of lithium ions, leading to a lower reversible specific capacity than its theoretical value. In this work, we prepared FeF3 /activated carbon foam (ACF) nanocomposites by impregnating FeF3 nanoparticles in the mesoporous ACF. The FeF3 /ACF nanocomposites showed improved electrochemical performances compared to bulk FeF3 . For example, the FeF3 /ACF nanocomposites showed an initial discharge capacity of 195 mAhg −1 at 0.1 C with a capacity retention of ~93% during 50 cycles in the voltage range 2.0−4.5 V. The cycling stability at 1.5−4.5 V was also superior to that of bulk FeF3 .
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