Fine-Particle Lithium Iron Phosho-olivine Synthesized by a Novel Modified Solid-state Reaction

摘要

In this paper, homogeneous and well-crystallized LiFePO_4 was synthesized by a novel modified solid-state reaction method following by heat treatment at relatively low temperature of 500℃ in Ar. No impurities are detected in the XRD patterns. The initial charge specific capacity and discharge specific capacity reach 157.2mAhg~(-1) and 152.6mAhg~(-1) respectively at 20℃. Voltage plateaus at around 3.45V were observed in all the curves, indicating that the charge and discharge reaction proceeds as a two-phase reaction. The initial charge specific capacity is 157.2mAhg~(-1) at 0.1C rate, i.e. 92% of the theoretical capacity, and specific capacity decreases slightly after 100 circles at room temperature.