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Red-blood-cell-like (NH4)[Fe2(OH)(PO4)2]•2H2O particles: Fabrication and application in high-performance LiFePO4 cathode materials

Abstract

A well-crystallized (NH4)[Fe2(OH)(PO4)2]•2H2O particle with red-blood-cell-like (RBC-like) shape has been synthesized via a simple sonochemical method, and is employed as the precursor to fabricate LiFePO4/C as cathode material for Li-ion batteries. Morphology evolution of (NH4)[Fe2(OH)(PO4)2]•2H2O from a nanoparticle to a nanoplate (~50 nm in thickness) and to a RBC-like discoidal is observed by increasing the reaction time. The formation mechanism of this kind of RBC-like shape can be understood as nucleation, crystallization, formation of thin plates, and self-assembly. The precursor and corresponding LiFePO4/C are characterized by XRD, SEM, TEM, charge-discharge tests and CV measurements. The results show that the morphology of (NH4)[Fe2(OH)(PO4)2]•2H2O precursor turns from RBC-like into irregular structure and the size becomes much smaller for LiFePO4/C during the solid-state reaction process. The fabricated LiFePO4/C manifests excellent rate performance with a discharge capacity of 113.4 mAh g-1 even at 10C, and delivers a capacity fading rate of 3.5% after 300 cycles. Thus, this kind of unique shaped (NH4)[Fe2(OH)(PO4)2]•2H2O shows potential application value in high-power Li-ion battery.

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Publication details

The article was received on 23 Sep 2017, accepted on 18 Oct 2017 and first published on 18 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA08413G
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Red-blood-cell-like (NH4)[Fe2(OH)(PO4)2]•2H2O particles: Fabrication and application in high-performance LiFePO4 cathode materials

    K. Wu, K. du and G. Hu, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA08413G

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