Synthesis of LiFePO4/C composite as a cathode material for lithium-ion battery by a novel two-step method

Abstract

In this study, LiFePO 4 /C is synthesized via a novel two-step method. The first step is the synthesis of nano-sized intermediate FePO 4 by a modified sol-gel method. A fast and full combustion procedure is involved to remove carbon and control the size of the intermediate particles. The second step is to prepare LiFePO 4 /C by combining solid-state reaction with controllable carbon coating. This two-step method is facile to prepare nanosized LiFePO 4 and easy to optimize the carbon content for surface coating. X-ray diffraction shows that the LiFePO 4 / C composite possesses good crystallinity. Spherical morphology with a diameter of 30-150 nm is observed by scanning electron microscope and transmission electron microscope. Electrochemical measurements indicate that the LiFePO 4 /C composite exhibits discharge capacities of 162, 144, 126, and 106 mAh g -1 at 0.1, 1, 2, and 5C, respectively. No capacity fading is observed in 50 cycles.

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“…However, it can also be found that the capacities are not stable for the initial few cycles. This unstable capacity may be attributed to the contact time between the electrode materials and electrolyte too short, resulting in an insufficient "activation" [32].…”

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