Novel synthesis of 3D mesoporous FePO4 from electroflocculation of iron filings as a precursor of high-performance LiFePO4/C cathode for lithium-ion batteries

Jiawu Peng, Xiaoting Hong, Qiongxiang Zhou, Kwan San Hui, Bin Chen

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

This study presents an economic and environmentally friendly method for the synthesis of microspherical FePO4·2H2O precursors with secondary nanostructures by the electroflocculation of low-cost iron fillers in a hot solution. The morphology and crystalline shape of the precursors were adjusted by gradient co-precipitation of pH conditions. The effect of precursor structure and morphology on the electrochemical performance of the synthesized LiFePO4/C was investigated. Electrochemical analysis showed that the assembly of FePO4·2H2O submicron spherical particles from primary nanoparticles and nanorods resulted in LiFePO4/C exhibiting excellent multiplicity and cycling performance with first discharge capacities at 0.2C, 1C, 5C, and 10C of 162.8, 134.7, 85.5, and 47.7 mAh·g-1, respectively, and the capacity of LiFePO4/C was maintained at 85.5% after 300 cycles at 1C. The significant improvement in the electrochemical performance of LiFePO4/C was attributed to the enhanced Li+ diffusion rate and the crystallinity of LiFePO4/C. Thus, this work shows a new three-dimensional mesoporous FePO4 synthesized from the iron flake electroflocculation as a precursor for high-performance LiFePO4/C cathodes for lithium-ion batteries.

Original languageEnglish
Pages (from-to)12707-12715
Number of pages9
JournalACS Omega
Volume8
Issue number14
Early online date29 Mar 2023
DOIs
Publication statusPublished - 11 Apr 2023

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