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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 320Synthesis of Nano-Sized FePO4 Cathode Material via...

Synthesis of Nano-Sized FePO₄ Cathode Material via a Microemulsion Technique

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Abstract:

A novelsynthetic method is developed to prepare nano-sized FePO₄ powdersused as cathode materials of lithium ion batteries. The samples are preparedvia a microemulsion system in a H₂O/cyclohexane/Triton x-100/n-butylalcohol, and then sinter at different temperatures (380°C，460°C，550°C，650°C)for 3h. The thermal stability，structure，morphology and particle size are investigated by means of TG/DSC, X-raydiffraction (XRD), field emission-scanning electron microscopy (FE-SEM), andthe electrochemical properties are characterized by cyclic voltammetry (CV) andgalvanostatic charge and discharge tests. Results show the grain size of FePO₄particles sintered at 460°C and 380°C for 3h ranges from 10nm to 20nm, and thecrystal structure is amorphous. The initial discharge specific capacity of FePO₄cathode sintered at 460°C for 3h reaches 139mAhg^-1and110mAh/g,respectively, at 0.1C and 0.3C. Increasing sintering temperature leads to thesmall particles agglomeration and the crystalline growth, and the crystalstructure changes from amorphous to trigonal when the sintering temperature isup to 550°C. The discharge specific capacity also decreases with the increase ofthe sintering temperature. These results suggest that nano-sized particles andamorphous structure can significantly improve the performances of FePO₄cathode.

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Periodical:

Applied Mechanics and Materials (Volume 320)

Pages:

675-682

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.320.675

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Online since:

May 2013

Authors:

Shi Ming Zhang, Jun Xi Zhang, Suo Jiong Xu, Xu Ji Yuan, Tian Tian

Keywords:

Cathode Material, Iron Phosphate, Lithium-Ion Battery, Microemulsion

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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