The Study on Synthesis and Modification for Iron Phosphate

Abstract

In order to improve the electrochemical performance of FePO 4, the method of Cr 3+ ion-doped FePO 4 was proposed in this paper. FePO 4 and doped Fe 1-x Cr x PO 4 (x = 0.02,0.04,0.06 and 0.08) were prepared by homogeneous co-precipitation followed by spray drying method, and then the samples were sintered at different temperatures (380°C, 460°C, 550°C and 650°C). Physical-chemical properties were characterized by using thermogravimetric analysis (TG), X-ray diffraction (XRD) and scanning electron microscope (SEM); electrochemical behavior of the samples were analyzed using charge–discharge test, electrochemical impedance spectroscopy (EIS). The results indicated that the Cr 3+ doping can effectively improve the electrochemical performance of FePO 4. Fe 0.96 Cr 0.04 PO 4 sintered at 460°C showed the highest specific capacity of 109.7 mAh/g for the 1st cycle at 0.05 C. In addition, the doping mechanism for FePO 4 was discussed in this paper.

Direct growth of FePO4/reduced graphene oxide nanosheet composites for the sodium-ion battery

“…To overcome these shortcomings, cation doping is usually an effective method to improve the electronic and ionic conductivity. 21,22 Unfortunately, carbon coating is not suitable to improve the electrochemical performance of FePO 4 because of easy reduction from Fe 3+ to Fe 2+ when adding carbon sources under 460 C heat treatment. 23,24 Since graphene was rst prepared by mechanical exfoliation and chemical vapour deposition, this material has attracted huge interest, owing to its large surface area, high electronic conductivity and excellent chemical stability.…”

Li ion diffusivity and electrochemical properties of FePO4 nanoparticles acted directly as cathode materials in lithium ion rechargeable batteries

“…Shi et al [17] obtained amorphous mesoporous FePO 4 by a template method, which was then used as cathode material. X. Yang et al [18] found that the Cr 3+ ion-doped FePO 4 (Fe 1−x Cr x PO 4 ) could effectively improve electrochemical performance overall.…”

Piloting melt synthesis and manufacturing processes to produce c‐lifepo4: preface

“…Spray drying is a high throughput, large scale unit operation that desiccates powders economically. Since 1994, as many as 50 articles indexed by WoS mention spray drying in combination with sol‐gel synthesis, carbothermal reduction, solid state reaction, and co‐precipitation . Several studies introduce multiple carbon sources—starch, glucose and oxalic acid, carbon nanotubes, and PVA—then calcine the solids at temperatures as high as 800.…”