Physical and Electrochemical Properties of LiFePO4/C Cathode Material Prepared from a New Carbon Source

Shi Xi Yu; Guo En Luo; Ying Luo; Wei Liu; Xiao Yuan Yu

doi:10.4028/www.scientific.net/AMR.160-162.1654

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 160-162Physical and Electrochemical Properties of...

Physical and Electrochemical Properties of LiFePO₄/C Cathode Material Prepared from a New Carbon Source

Abstract:

LiFePO4/C cathode materials for lithium ion battery were prepared by solid-state method from using Polystyrene (PS) micro-spheres as new carbon source. The structure, morphology and electrochemical performances of LiFePO4/C were investigated by X-ray diffraction (XRD), scanning electronic morphology (SEM) and galvanostatic charge-discharge tests and cycle voltammetry (CV). The results demonstrate that LiFePO4/C have single olivine type structure with small particle sizes. The electrochemical test results show that the residual carbon produced by the pyrolysis of PS microspheres with functionalized aromatic groups exhibites a better discharge capacity in the LiFePO4/C composite. The LiFePO4/C cathode material with 7 wt% PS delivers an initial discharge capacity of 141mAh/g at 0.1C and between 2.5-4.1V, and displays excellent capacity retention. The composite material exhibited a higher peak intensity and a smaller voltage difference between the oxidation and reduction peak, indicating a good electrochemical reaction reversibility.

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Advanced Materials Research (Volumes 160-162)

Pages:

1654-1658

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.160-162.1654

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Online since:

November 2010

Authors:

Shi Xi Yu, Guo En Luo, Ying Luo, Wei Liu, Xiao Yuan Yu

Keywords:

Cathode Material, LiFePO₄/C, Lithium-Ion Battery, Polystyrene Microsphere

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