Synthesis and Electrochemical Properties of Spherical LiFePO4/C Composite via Spray Drying

Juan Mei Wang; Bing Ren; Ying Lin Yan; Qing Zhang; Yan Wang

doi:10.4028/www.scientific.net/AMR.1120-1121.554

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 1120-1121Synthesis and Electrochemical Properties of...

Synthesis and Electrochemical Properties of Spherical LiFePO₄/C Composite via Spray Drying

Abstract:

In this work, spherical LiFePO₄/C composite had been synthesized by co-precipitation and spray drying method. The structure, morphology and electrochemical properties of the samples were characterized by X-ray diffraction (XRD), scanning electron micrograph (SEM), transmission electron microscope (TEM), constant current charge-discharge tests and electrochemical impedance spectroscopy (EIS) tests. The spherical LiFePO₄/C particles consisted of a number of smaller grains. The results showed that the morphology of LiFePO₄/C particles seriously affected the Li-ion diffusion coefficient and electrochemical properties of lithium ion batteries. Electrochemical tests revealed the spherical LiFePO₄/C composite had excellent Li-ion diffusion coefficient which was calculated to be 1.065×10^-11 cm²/s and discharge capacity of 149 (0.1 C), 139 (0.2 C), 133 (0.5 C), 129 (1 C) and 124 mAhg^-1(2 C). After 50 cycles, the capacity retention rate was still 93.5%.

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Periodical:

Advanced Materials Research (Volumes 1120-1121)

Pages:

554-558

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1120-1121.554

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Online since:

July 2015

Authors:

Juan Mei Wang, Bing Ren, Ying Lin Yan*, Qing Zhang, Yan Wang

Keywords:

Lithium Iron Phosphate, Spherical Structure, Spray Drying

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