A novel in-situ fabrication of N-doped carbon fibers wrapped nano-LiFePO4 composites as cathode of advanced Li-ion batteries

Abstract

In this work, we first report a novel in-situ fabrication of N-doped carbon fibers-wrapped nano-LiFePO4 composites by reducing low- cost FePO4 with nitrilotriacetic acid (NTA). The crystallization temperature, particle morphology, composition, phase have been investigated by thermogravimetric analysis (TGA), X-ray diffraction (XRD), X-ray photoelectron spectroscopic (XPS) and scanning electron microscopy (SEM). The proper content of NTA is 10 wt%. As cathode of lithium-half batteries, the LiFePO4 composites with 10 wt% NTA deliver superior lithium storage performance to the previously reported LiFePO4. Specifically, the composites approach a capacity of 155.5 mA h g−1 after 500 cycles at 0.1C, 98 mAh g−1 after 2000 cycles at 10C, and good rate capability, which is suitable for the development of power batteries.