Synthesis and Electrochemical Property of Carbon Coated LiFePO₄ Nanoplates

Abstract

To improve the rate performance of LiFePO 4 cathode material, LiFePO 4 nanoplates were synthesized via one-step glycol-based solvothermal process.Additionally, carbon was employed to coat LiFePO 4 with glucose served as carbon source.The morphologies and electrochemical properties of the as-prepared materials were characterized by XRD, BET, SEM, TEM, cyclic voltammetry, etc. Results showed that LiFePO 4 nanoplates had the size of approximately 150 nm×100 nm×60 nm, displaying a short b-axis.The rate performance of LiFePO 4 nanoplates was enhanced with the increment of carbon content, and the sample containing 6.4wt% carbon (LF0.2) exhibited the most outstanding electrochemical performance, which delivered discharge capacities of 157.3 mAh/g and 132.6 mAh/g at 0.2C and 10C rates, respectively.Meanwhile, excellent cycling stability of LF0.2, 80.2% capacity retention after 500 cycles at 5C rate, was observed.