Synthesis and Electrochemical Performance of Olivine LiFePO4-based Composite Cathode Materials

Abstract

Abstract: Olivine LiFePO₄/C composite cathode materials were synthesized by a solid state method in an inert atmosphere.The effects of the calcined temperature on the properties of as-synthesized cathode materials were investigated.The crystal structure and the electrochemical performance were characterized by XRD,SEM,TG-DSC,laser particle-size distribution measurement and electrochemical performance testing.The results demonstrate that pure and well-crystallized powders,smaller particle size and intimate carbon contact are necessary for optimizing electrochemical performance.The material calcined at 750 ℃ had a complete olivine structure,uniform surface morphology,better particle-size distribution and excellent electrochemical performances.The initial discharge capacity,namely 142.5 mA·h/g,was obtained at room temperature and 0.05 C charge-dischange rate.After 50 cycles,there was no obvious capacity fade.

Key words: Lithium ion battery, Cathode material, LiFePO₄, Olivine, Charge-discharge rate

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TANG Zhi-Yuan, RUAN Yan-Li, SONG Quan-Sheng, LU Xing-He . Synthesis and Electrochemical Performance of Olivine LiFePO₄-based Composite Cathode Materials[J]. Chem. J. Chinese Universities, 2005, 26(10): 1905.

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Synthesis and Electrochemical Performance of Olivine LiFePO₄-based Composite Cathode Materials

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