Influence of Phosphorus Molar Ratio on the Fabrication and Electrochemical Properties of Nanorod-Shaped LiFePO4 Synthesized via Iron Powder Reduction for Lithium-Ion Battery Applications
Abstract
In this work, nanorod lithium iron phosphate (LiFePO4) materials are synthesized by a liquid-phase method using iron powder, H3PO4, and LiOH⋅H2O as source materials. The crystal structure, morphology and electrochemical performance are characterized. The results illustrate that the molar ratio of Li:Fe:P plays a significant role in regulating the morphology and structure of LiFePO4. When the molar ratio is Li:Fe:P = 3:1:1 it shows irregular nanoparticles, and when the molar ratio is Li:Fe:P = 3:1:1.5 it transforms into rod-like particles. Furtherly, The LiFePO4/C (Li:Fe:P = 3:1:1.5) material, adding carbon coating at 180∘C for 12h, displays a discharge capacity of 120mAh/g at 1C, and even after 200 cycles with the capacity retention of above 95.7%. Our findings provide a simple, economical and environmentally friendly way to produce LiFePO4 cathode material for outstanding performance in lithium-ion battery (LIB).
