Electrochemical properties of self-assembled porous micro-spherical LiFePO4/PAS composite prepared by spray-drying method

Polyacene (PAS) coated self-assembled porous micro-spherical LiFePO4 cathode material is successfully synthesized by spray drying method. The crystal structure of the sample is examined by X-ray diffraction (XRD). The micro-spherical morphology with porous structure is observed by scanning electron...

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Bibliographic Details
Published in:Electrochimica acta 2015-12, Vol.186, p.117-124
Main Authors: Chen, Zhaoyong, Zhao, Qunfang, Xu, Ming, Li, Lingjun, Duan, Junfei, Zhu, Huali
Format: Article
Language:English
Subjects:
Cathode materials
Lithium iron phosphate
Porous structure
Self-assembled micro-spherical particles
Spray drying
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Summary:Polyacene (PAS) coated self-assembled porous micro-spherical LiFePO4 cathode material is successfully synthesized by spray drying method. The crystal structure of the sample is examined by X-ray diffraction (XRD). The micro-spherical morphology with porous structure is observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The electrochemical properties are investigated via galvanostatic charge-discharge experiments and electrochemical impedance spectroscopy (EIS) analysis. The material exhibits a high lithium ion diffusion coefficient about 10−12cm2S−1, excellent electrochemical properties and good cyclability. The initial discharge capacity is as high as 168mAh/g at 0.1C rate, and the capacity retention is approximately 100% after 100 cycles at 1C rate, almost no capacity fading. All demonstrate that self-assembled micro-spherical particles with nano primary particles and porous structure are benefit to improve the electrochemical performance of cathode materials.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2015.10.143